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Note: This page contains sample records for the topic "optical glass fibers" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


1

Hybrid glass coatings for optical fibers: effect of coating thickness on strength and dynamic fatigue characteristics of silica fibers  

E-Print Network [OSTI]

Hybrid glass coatings for optical fibers: effect of coating thickness on strength and dynamic. Wojcik c , A. Walewski c a Hybrid Glass Technologies, Inc., Monmouth Junction, NJ 08852, USA b Rutgers coatings. Recently developed sol-gel derived inorganic- organic hybrid materials called hybrid glass

Matthewson, M. John

2

A cerium glass fiber-optic active target for high energy physics experiments  

SciTech Connect (OSTI)

A fiber-optic plate imaging system has been developed for active target and tracking applications, in which the active element is Ce(3+) in a silicate glass. Particle tracks and interactions have been recorded with a hit density of /approx gt/4/mm for minimum ionizing particles and with a spatial resolution sigma /similar to/ 28..mu..m.

Ruchti, R.; Baumbaugh, B.; Bishop, J.; Biswas, N.; Busenitz, J.; Cason, N.; Cunningham, J.; Gardner, R.; Grenquist, S.; Kenney, V.; Mannel, E.; Mountain, R.; Shephard, W.; Baumbaugh, A.; Knickerbocker, K.; Wegner, C.; Yarema, R.; Rogers, A.; Kinchen, B.; Ellis, J.; Mead, R.; Swanson, D.

1985-10-01T23:59:59.000Z

3

Optical Glass  

Science Journals Connector (OSTI)

... space of time. In the forefront of such vital industries is the manufacture of optical glass. However great the other resources in men and material may be, it would be ... be, it would be quite impossible to wage successful warfare without adequate supplies of optical glass ior binocular field- ...

1919-03-27T23:59:59.000Z

4

Detection of Propane by IR-ATR in a Teflon®-Clad Fluoride Glass Optical Fiber  

Science Journals Connector (OSTI)

The detection of propane with the use of ATR spectroscopy at 3.3 ?m, as the gas diffuses through the Teflon® cladding of a fluoride optical fiber, is reported. A...

Ruddy, V; McCabe, S

1990-01-01T23:59:59.000Z

5

Colored optical glass  

Science Journals Connector (OSTI)

The Lytkarino Optical Glass Factory manufactures various types of colored optical glasses: yellow, orange, and red glasses and glasses that are transparent in the IR region, as well as...

Mogil’naya, L G; Zinov’eva, O B; Firsova, Yu A; Gulyukin, M N

2013-01-01T23:59:59.000Z

6

Optical Fibers Optics and Photonics  

E-Print Network [OSTI]

Optical Fibers Optics and Photonics Dr. Palffy-Muhoray Ines Busuladzic Department of Theoretical and Applied Mathematics The University of Akron April 21, 2008 #12;Outline · History of optical fibers · What are optical fibers? · How are optical fibers made? · Light propagation through optical fibers · Application

Palffy-Muhoray, Peter

7

Germania-glass-core silica-glass-cladding modified chemical-vapor deposition optical fibers: optical losses, photorefractivity, and Raman amplification  

Science Journals Connector (OSTI)

Germania-glass-core silica-glass-cladding single-mode fibers (?n as great as 0.143) with a minimum loss of 20 dB/km at 1.85 µm were fabricated by modified chemical-vapor...

Mashinsky, V M; Neustruev, V B; Dvoyrin, V V; Vasiliev, S A; Medvedkov, O I; Bufetov, I A; Shubin, A V; Dianov, E M; Guryanov, A N; Khopin, V F; Salgansky, M Yu

2004-01-01T23:59:59.000Z

8

Fiber optic coupled optical sensor  

DOE Patents [OSTI]

A displacement sensor includes a first optical fiber for radiating light to a target, and a second optical fiber for receiving light from the target. The end of the first fiber is adjacent and not axially aligned with the second fiber end. A lens focuses light from the first fiber onto the target and light from the target onto the second fiber.

Fleming, Kevin J. (Albuquerque, NM)

2001-01-01T23:59:59.000Z

9

Fiber optic connector  

DOE Patents [OSTI]

A fiber optic connector and method for connecting composite materials within which optical fibers are imbedded. The fiber optic connector includes a capillary tube for receiving optical fibers at opposing ends. The method involves inserting a first optical fiber into the capillary tube and imbedding the unit in the end of a softened composite material. The capillary tube is injected with a coupling medium which subsequently solidifies. The composite material is machined to a desired configuration. An external optical fiber is then inserted into the capillary tube after fluidizing the coupling medium, whereby the optical fibers are coupled.

Rajic, Slobodan (Knoxville, TN); Muhs, Jeffrey D. (Lenior City, TN)

1996-01-01T23:59:59.000Z

10

Fiber optic vibration sensor  

DOE Patents [OSTI]

A fiber optic vibration sensor utilizes two single mode optical fibers supported by a housing with one optical fiber fixedly secured to the housing and providing a reference signal and the other optical fiber having a free span length subject to vibrational displacement thereof with respect to the housing and the first optical fiber for providing a signal indicative of a measurement of any perturbation of the sensor. Damping or tailoring of the sensor to be responsive to selected levels of perturbation is provided by altering the diameter of optical fibers or by immersing at least a portion of the free span length of the vibration sensing optical fiber into a liquid of a selected viscosity.

Dooley, Joseph B. (Harriman, TN); Muhs, Jeffrey D. (Lenoir City, TN); Tobin, Kenneth W. (Harriman, TN)

1995-01-01T23:59:59.000Z

11

Fiber optic vibration sensor  

DOE Patents [OSTI]

A fiber optic vibration sensor utilizes two single mode optical fibers supported by a housing with one optical fiber fixedly secured to the housing and providing a reference signal and the other optical fiber having a free span length subject to vibrational displacement thereof with respect to the housing and the first optical fiber for providing a signal indicative of a measurement of any perturbation of the sensor. Damping or tailoring of the sensor to be responsive to selected levels of perturbation is provided by altering the diameter of optical fibers or by immersing at least a portion of the free span length of the vibration sensing optical fiber into a liquid of a selected viscosity. 2 figures.

Dooley, J.B.; Muhs, J.D.; Tobin, K.W.

1995-01-10T23:59:59.000Z

12

Estimation the Performance of Solar Fiber Optic Lighting System after Repairing the Glass Fiber Cables in a South Korean Residential Building  

E-Print Network [OSTI]

The solar fiber optic lighting system consists of the solar ray concentrating apparatus, the tracking control, lighting transmission and emission parts. This system was installed on a 20-storey apartment building in South Korea. Many residents had...

Cha, K. S.; Kim, T. K.; Park, M. S.

13

Fiber optic laser rod  

DOE Patents [OSTI]

A laser rod is formed from a plurality of optical fibers, each forming an individual laser. Synchronization of the individual fiber lasers is obtained by evanescent wave coupling between adjacent optical fiber cores. The fiber cores are dye-doped and spaced at a distance appropriate for evanescent wave coupling at the wavelength of the selected dye. An interstitial material having an index of refraction lower than that of the fiber core provides the optical isolation for effective lasing action while maintaining the cores at the appropriate coupling distance. 2 figs.

Erickson, G.F.

1988-04-13T23:59:59.000Z

14

Glass for Optical Purposes  

Science Journals Connector (OSTI)

... THE importance of an adequate supply of optical glass of all the principal types cannot be overestimated. The improvement of the microscope has ... improvement of the microscope has been and is still retarded for the want of suitable glasses, the construction of large telescopes is limited by the capacity of the glassmaker to ...

S. D. CHALMERS

1914-10-01T23:59:59.000Z

15

Multimode optical fiber  

DOE Patents [OSTI]

A depressed graded-index multimode optical fiber includes a central core, an inner depressed cladding, a depressed trench, an outer depressed cladding, and an outer cladding. The central core has an alpha-index profile. The depressed claddings limit the impact of leaky modes on optical-fiber performance characteristics (e.g., bandwidth, core size, and/or numerical aperture).

Bigot-Astruc, Marianne; Molin, Denis; Sillard, Pierre

2014-11-04T23:59:59.000Z

16

Fiber optic hydrophone  

DOE Patents [OSTI]

A miniature fiber optic hydrophone based on the principles of a Fabry-Perot interferometer. The hydrophone, in one embodiment, includes a body having a shaped flexible bladder at one end which defines a volume containing air or suitable gas, and including a membrane disposed adjacent a vent. An optic fiber extends into the body with one end terminating in spaced relation to the membrane. Acoustic waves in the water that impinge on the bladder cause the pressure of the volume therein to vary causing the membrane to deflect and modulate the reflectivity of the Fabry-Perot cavity formed by the membrane surface and the cleaved end of the optical fiber disposed adjacent to the membrane. When the light is transmitted down the optical fiber, the reflected signal is amplitude modulated by the incident acoustic wave. Another embodiment utilizes a fluid filled volume within which the fiber optic extends.

Kuzmenko, Paul J. (Livermore, CA); Davis, Donald T. (Livermore, CA)

1994-01-01T23:59:59.000Z

17

Fiber optic hydrophone  

DOE Patents [OSTI]

A miniature fiber optic hydrophone based on the principles of a Fabry-Perot interferometer is disclosed. The hydrophone, in one embodiment, includes a body having a shaped flexible bladder at one end which defines a volume containing air or suitable gas, and including a membrane disposed adjacent a vent. An optical fiber extends into the body with one end terminating in spaced relation to the membrane. Acoustic waves in the water that impinge on the bladder cause the pressure of the volume therein to vary causing the membrane to deflect and modulate the reflectivity of the Fabry-Perot cavity formed by the membrane surface and the cleaved end of the optical fiber disposed adjacent to the membrane. When the light is transmitted down the optical fiber, the reflected signal is amplitude modulated by the incident acoustic wave. Another embodiment utilizes a fluid filled volume within which the fiber optic extends. 2 figures.

Kuzmenko, P.J.; Davis, D.T.

1994-05-10T23:59:59.000Z

18

Fiber optic moisture sensor  

DOE Patents [OSTI]

A method and apparatus for sensing moisture changes by utilizing optical fiber technology. One embodiment uses a reflective target at the end of an optical fiber. The reflectance of the target varies with its moisture content and can be detected by a remote unit at the opposite end of the fiber. A second embodiment utilizes changes in light loss along the fiber length. This can be attributed to changes in reflectance of cladding material as a function of its moisture content. It can also be affected by holes or inserts interposed in the cladding material and/or fiber. Changing light levels can also be coupled from one fiber to another in an assembly of fibers as a function of varying moisture content in their overlapping lengths of cladding material.

Kirkham, R.R.

1984-08-03T23:59:59.000Z

19

Fiber optic hydrogen sensor  

DOE Patents [OSTI]

An apparatus and method for detecting a chemical substance by exposing an optic fiber having a core and a cladding to the chemical substance so that the chemical substance can be adsorbed onto the surface of the cladding. The optic fiber is coiled inside a container having a pair of valves for controlling the entrance and exit of the substance. Light from a light source is received by one end of the optic fiber, preferably external to the container, and carried by the core of the fiber. Adsorbed substance changes the transmissivity of the fiber as measured by a spectrophotometer at the other end, also preferably external to the container. Hydrogen is detected by the absorption of infrared light carried by an optic fiber with a silica cladding. Since the adsorption is reversible, a sensor according to the present invention can be used repeatedly. Multiple positions in a process system can be monitored using a single container that can be connected to each location to be monitored so that a sample can be obtained for measurement, or, alternatively, containers can be placed near each position and the optic fibers carrying the partially-absorbed light can be multiplexed for rapid sequential reading by a single spectrophotometer.

Buchanan, Bruce R. (1985 Willis, Batesburg, SC 29006); Prather, William S. (2419 Dickey Rd., Augusta, GA 30906)

1992-01-01T23:59:59.000Z

20

Fiber optic hydrogen sensor  

DOE Patents [OSTI]

Apparatus and method for detecting a chemical substance by exposing an optic fiber having a core and a cladding to the chemical substance so that the chemical substance can be adsorbed onto the surface of the cladding. The optic fiber is coiled inside a container having a pair of valves for controlling the entrance and exit of the substance. Light from a light source is received by one end of the optic fiber, preferably external to the container, and carried by the core of the fiber. Adsorbed substance changes the transmissivity of the fiber as measured by a spectrophotometer at the other end, also preferably external to the container. Hydrogen is detected by the absorption of infrared light carried by an optic fiber with a silica cladding. Since the adsorption is reversible, a sensor according to the present invention can be used repeatedly. Multiple positions in a process system can be monitored using a single container that can be connected to each location to be monitored so that a sample can be obtained for measurement, or, alternatively, containers can be placed near each position and the optic fibers carrying the partially-absorbed light can be multiplexed for rapid sequential reading, by a single spectrophotometer.

Buchanan, B.R.; Prather, W.S.

1991-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "optical glass fibers" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Fiber optic hydrogen sensor  

DOE Patents [OSTI]

An apparatus and method are described for detecting a chemical substance by exposing an optic fiber having a core and a cladding to the chemical substance so that the chemical substance can be adsorbed onto the surface of the cladding. The optic fiber is coiled inside a container having a pair of valves for controlling the entrance and exit of the substance. Light from a light source is received by one end of the optic fiber, preferably external to the container, and carried by the core of the fiber. Adsorbed substance changes the transmissivity of the fiber as measured by a spectrophotometer at the other end, also preferably external to the container. Hydrogen is detected by the absorption of infrared light carried by an optic fiber with a silica cladding. Since the adsorption is reversible, a sensor according to the present invention can be used repeatedly. Multiple positions in a process system can be monitored using a single container that can be connected to each location to be monitored so that a sample can be obtained for measurement, or, alternatively, containers can be placed near each position and the optic fibers carrying the partially-absorbed light can be multiplexed for rapid sequential reading by a single spectrophotometer. 4 figs.

Buchanan, B.R.; Prather, W.S.

1992-10-06T23:59:59.000Z

22

Method for the continuous processing of hermetic fiber optic components and the resultant fiber optic-to-metal components  

DOE Patents [OSTI]

Hermetic fiber optic-to-metal components and method for making hermetic fiber optic-to-metal components by assembling and fixturing elements comprising a metal shell, a glass preform, and a metal-coated fiber optic into desired relative positions and then sealing said fixtured elements preferably using a continuous heating process. The resultant hermetic fiber optic-to-metal components exhibit high hermeticity and durability despite the large differences in thermal coefficients of expansion among the various elements.

Kramer, Daniel P. (Centerville, OH)

1994-08-09T23:59:59.000Z

23

Silicon fiber optic sensors  

DOE Patents [OSTI]

A Fabry-Perot cavity is formed by a partially or wholly reflective surface on the free end of an integrated elongate channel or an integrated bounding wall of a chip of a wafer and a partially reflective surface on the end of the optical fiber. Such a constructed device can be utilized to detect one or more physical parameters, such as, for example, strain, through the optical fiber using an optical detection system to provide measuring accuracies of less than aboutb0.1%.

Pocha, Michael D. (Livermore, CA); Swierkowski, Steve P. (Livermore, CA); Wood, Billy E. (Livermore, CA)

2007-10-02T23:59:59.000Z

24

Fiber optic fluid detector  

DOE Patents [OSTI]

Particular gases or liquids are detected with a fiber optic element having a cladding or coating of a material which absorbs the fluid or fluids and which exhibits a change of an optical property, such as index of refraction, light transmissiveness or fluoresence emission, for example, in response to absorption of the fluid. The fluid is sensed by directing light into the fiber optic element and detecting changes in the light, such as exit angle changes for example, that result from the changed optical property of the coating material. The fluid detector may be used for such purposes as sensing toxic or explosive gases in the atmosphere, measuring ground water contamination or monitoring fluid flows in industrial processes, among other uses. 10 figs.

Angel, S.M.

1987-02-27T23:59:59.000Z

25

Large core fiber optic cleaver  

DOE Patents [OSTI]

The present invention relates to a device and method for cleaving optical fibers which yields cleaved optical fiber ends possessing high damage threshold surfaces. The device can be used to cleave optical fibers with core diameters greater than 400 {micro}m. 30 figs.

Halpin, J.M.

1996-03-26T23:59:59.000Z

26

Aerogel-clad optical fiber  

DOE Patents [OSTI]

An optical fiber is surrounded by an aerogel cladding. For a low density aerogel, the index of refraction of the aerogel is close to that of air, which provides a high numerical aperture to the optical fiber. Due to the high numerical aperture, the aerogel clad optical fiber has improved light collection efficiency.

Sprehn, Gregory A. (Livermore, CA); Hrubesh, Lawrence W. (Pleasanton, CA); Poco, John F. (Livermore, CA); Sandler, Pamela H. (San Marino, CA)

1997-01-01T23:59:59.000Z

27

New Types of Optical Glass  

Science Journals Connector (OSTI)

... IN view of the interest shown in new optical glasses recently produced in Great Britain and in the United States, we wish to summarize ... probable lines of development. Advances in lens design have led to a demand for new glasses with optical properties different from those available hitherto as outlined in a recent paper by ...

W. M. HAMPTON; R. E. BASTICK; W. N. WHEAT

1944-03-04T23:59:59.000Z

28

Fiber optic geophysical sensors  

DOE Patents [OSTI]

A fiber optic geophysical sensor in which laser light is passed through a sensor interferometer in contact with a geophysical event, and a reference interferometer not in contact with the geophysical event but in the same general environment as the sensor interferometer. In one embodiment, a single tunable laser provides the laser light. In another embodiment, separate tunable lasers are used for the sensor and reference interferometers. The invention can find such uses as monitoring for earthquakes, and the weighing of objects.

Homuth, Emil F. (Los Alamos, NM)

1991-01-01T23:59:59.000Z

29

Optical and optoelectronic fiber devices  

E-Print Network [OSTI]

The ability to integrate materials with disparate electrical, thermal, and optical properties into a single fiber structure enabled the realization of fiber devices with diverse and complex functionalities. Amongst those, ...

Shapira, Ofer, Ph. D. Massachusetts Institute of Technology

2007-01-01T23:59:59.000Z

30

Fiber optic geophysical sensors  

DOE Patents [OSTI]

A fiber optic geophysical sensor is described in which laser light is passed through a sensor interferometer in contact with a geophysical event, and a reference interferometer not in contact with the geophysical event but in the same general environment as the sensor interferometer. In one embodiment, a single tunable laser provides the laser light. In another embodiment, separate tunable lasers are used for the sensor and reference interferometers. The invention can find such uses as monitoring for earthquakes, and the weighing of objects. 2 figures.

Homuth, E.F.

1991-03-19T23:59:59.000Z

31

Method for the continuous processing of hermetic fiber optic components and the resultant fiber optic-to-metal components  

DOE Patents [OSTI]

Hermetic fiber optic-to-metal components and method for making hermetic fiber optic-to-metal components by assembling and fixturing elements comprising a metal shell, a glass preform, and a metal-coated fiber optic into desired relative positions and then sealing said fixtured elements preferably using a continuous heating process is disclosed. The resultant hermetic fiber optic-to-metal components exhibit high hermeticity and durability despite the large differences in thermal coefficients of expansion among the various elements. 3 figs.

Kramer, D.P.

1994-08-09T23:59:59.000Z

32

Glass fiber channels laser light to robot  

Science Journals Connector (OSTI)

Glass fiber channels laser light to robot ... In a demonstration of the technique, a fiberoptic cable carried a laser beam of more than 10,000 W of peak power—400 W average—from a neodymiumyttrium- aluminum-garnet laser to an industrial robot more than 25 yards away. ...

1983-11-28T23:59:59.000Z

33

Fiber Optics and Expanded Beam Termini  

E-Print Network [OSTI]

and claddingcore and cladding Core: inner cylinder of doped glass (i.e. Ge); 9, 50, 62.5 m diameter Cladding: outer.5m / 62.5 m corem core Laser OptimizedLaser Optimized POFPOF ­­ Plastic Optical Fiber ·Cladding ­ 125 m ·Acrylate ­ 250 m ·PVC Buffer ­ 900 m ·Aramyd Yarn (Kevlar) ·Outer Jacket ­ 2, 3mm

La Rosa, Andres H.

34

Synthesis of nanocrystals in KNb(Ge,Si)O{sub 5} glasses and chemical etching of nanocrystallized glass fibers  

SciTech Connect (OSTI)

The nanocrystallization behavior of 25K{sub 2}O-25Nb{sub 2}O{sub 5}-(50-x)GeO{sub 2}-xSiO{sub 2} glasses with x=0,25,and50 (i.e., KNb(Ge,Si)O{sub 5} glasses) and the chemical etching behavior of transparent nanocrystallized glass fibers have been examined. All glasses show nanocrystallization, and the degree of transparency of the glasses studied depends on the heat treatment temperature. Transparent nanocrystallized glasses can be obtained if the glasses are heat treated at the first crystallization peak temperature. Transparent nanocrystallized glass fibers with a diameter of about 100{mu}m in 25K{sub 2}O-25Nb{sub 2}O{sub 5}-50GeO{sub 2} are fabricated, and fibers with sharpened tips (e.g., the taper length is about 450{mu}m and the tip angle is about 12{sup o}) are obtained using a meniscus chemical etching method, in which etching solutions of 10wt%-HF/hexane and 10M-NaOH/hexane are used. Although the tip (aperture size) has not a nanoscaled size, the present study suggests that KNb(Ge,Si)O{sub 5} nanocrystallized glass fibers have a potential for new near-field optical fiber probes with high refractive indices of around n=1.8 and high dielectric constants of around {epsilon}=58 (1kHz, room temperature)

Enomoto, Itaru [Department of Materials Science and Technology, Nagaoka University of Technology, 1603-1 Kamitomioka-cho, Nagaoka 940-2188 (Japan); Benino, Yasuhiko [Department of Materials Science and Technology, Nagaoka University of Technology, 1603-1 Kamitomioka-cho, Nagaoka 940-2188 (Japan); Fujiwara, Takumi [Department of Materials Science and Technology, Nagaoka University of Technology, 1603-1 Kamitomioka-cho, Nagaoka 940-2188 (Japan); Komatsu, Takayuki [Department of Materials Science and Technology, Nagaoka University of Technology, 1603-1 Kamitomioka-cho, Nagaoka 940-2188 (Japan)]. E-mail: komatsu@chem.nagaokaut.ac.jp

2006-06-15T23:59:59.000Z

35

Optical fiber inspection system  

DOE Patents [OSTI]

A remote optical inspection system including an inspection head. The inspection head has a passageway through which pellets or other objects are passed. A window is provided along the passageway through which light is beamed against the objects being inspected. A plurality of lens assemblies are arranged about the window so that reflected light can be gathered and transferred to a plurality of coherent optical fiber light guides. The light guides transfer the light images to a television or other image transducer which converts the optical images into a representative electronic signal. The electronic signal can then be displayed on a signal viewer such as a television monitor for inspection by a person. A staging means can be used to support the objects for viewing through the window. Routing means can be used to direct inspected objects into appropriate exit passages for accepted or rejected objects. The inspected objects are advantageously fed in a singular manner to the staging means and routing means. The inspection system is advantageously used in an enclosure when toxic or hazardous materials are being inspected. 10 figs.

Moore, F.W.

1985-04-05T23:59:59.000Z

36

Mechanical Properties of Aluminum Fluoride Glass Fibers James Colaizzi, M. John Matthewson, Tariq Iqbal, and Mahmoud R. Shahriari  

E-Print Network [OSTI]

#12;Mechanical Properties of Aluminum Fluoride Glass Fibers James Colaizzi, M. John Matthewson solutions of various pH values on the mechanical properties of polymer coated optical fibers of an aluminum to failure of the fiber. In static fatigue, the time to failure of the aluminum fluoride-based fibers

Matthewson, M. John

37

Low-temperature hermetic sealing of optical fiber components  

DOE Patents [OSTI]

A method for manufacturing low-temperature hermetically sealed optical fi components is provided. The method comprises the steps of: inserting an optical fiber into a housing, the optical fiber having a glass core, a glass cladding and a protective buffer layer disposed around the core and cladding; heating the housing to a predetermined temperature, the predetermined temperature being below a melting point for the protective buffer layer and above a melting point of a solder; placing the solder in communication with the heated housing to allow the solder to form an eutectic and thereby fill a gap between the interior of the housing and the optical fiber; and cooling the housing to allow the solder to form a hermetic compression seal between the housing and the optical fiber.

Kramer, Daniel P. (Centerville, OH)

1996-10-22T23:59:59.000Z

38

Fiber optic refractive index monitor  

DOE Patents [OSTI]

A sensor for measuring the change in refractive index of a liquid uses the lowest critical angle of a normal fiber optic to achieve sensitivity when the index of the liquid is significantly less than the index of the fiber core. Another embodiment uses a liquid filled core to ensure that its index is approximately the same as the liquid being measured.

Weiss, Jonathan David (Albuquerque, NM)

2002-01-01T23:59:59.000Z

39

Scintillator fiber optic long counter  

DOE Patents [OSTI]

A flat response position sensitive neutron detector capable of providing neutron spectroscopic data utilizing scintillator fiber optic filaments embedded in a neutron moderating housing having an open end through which neutrons enter to be detected.

McCollum, Tom (Sterling, VA); Spector, Garry B. (Fairfax, VA)

1994-01-01T23:59:59.000Z

40

Light diffusing fiber optic chamber  

DOE Patents [OSTI]

A light diffusion system for transmitting light to a target area. The light is transmitted in a direction from a proximal end to a distal end by an optical fiber. A diffusing chamber is operatively connected to the optical fiber for transmitting the light from the proximal end to the distal end and transmitting said light to said target area. A plug is operatively connected to the diffusing chamber for increasing the light that is transmitted to the target area.

Maitland, Duncan J. (Lafayette, CA)

2002-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "optical glass fibers" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

Fiber optic temperature sensor  

SciTech Connect (OSTI)

Our fiber optic temperature measurement sensor and system is a major improvement over methods currently in use in most industrial processes, and it delivers all of the attributes required simplicity, accuracy, and cost efficiency-to help improve all of these processes. Because temperature is a basic physical attribute of nearly every industrial and commercial process, our system can eventually result in significant improvements in nearly every industrial and commercial process. Many finished goods, and the materials that go into them, are critically dependent on the temperature. The better the temperature measurement, the better quality the goods will be and the more economically they can be produced. The production and transmission of energy requires the monitoring of temperature in motors, circuit breakers, power generating plants, and transmission line equipment. The more reliable and robust the methods for measuring these temperature, the more available, stable, and affordable the supply of energy will become. The world is increasingly realizing the threats to health and safety of toxic or otherwise undesirable by products of the industrial economy in the environment. Cleanup of such contamination often depends on techniques that require the constant monitoring of temperature in extremely hazardous environments, which can damage most conventional temperature sensors and which are dangerous for operating personnel. Our system makes such monitoring safer and more economical.

Rabold, D.

1995-12-01T23:59:59.000Z

42

Preform For Producing An Optical Fiber And Method Therefor  

DOE Patents [OSTI]

The present invention provides a simple method for fabricating fiber-optic glass preforms having complex refractive index configurations and/or dopant distributions in a radial direction with a high degree of accuracy and precision. The method teaches bundling together a plurality of glass rods of specific physical, chemical, or optical properties and wherein the rod bundle is fused in a manner that maintains the cross-sectional composition and refractive-index profiles established by the position of the rods.

Kliner, Dahv A. V. (San Ramon, CA); Koplow, Jeffery P. (Washington, DC)

2005-04-19T23:59:59.000Z

43

Preform For Producing An Optical Fiber And Method Therefor  

DOE Patents [OSTI]

The present invention provides a simple method for fabricating fiber-optic glass preforms having complex refractive index configurations and/or dopant distributions in a radial direction with a high degree of accuracy and precision. The method teaches bundling together a plurality of glass rods of specific physical, chemical, or optical properties and wherein the rod bundle is fused in a manner that maintains the cross-sectional composition and refractive-index profiles established by the position of the rods.

Kliner, Dahv A. V. (San Ramon, CA); Koplow, Jeffery P. (Washington, DC)

2004-08-10T23:59:59.000Z

44

Glass fiber composition. [for use as thermal insulation  

DOE Patents [OSTI]

The invention relates to a glass fiber composition useful for thermal insulation having a low melting temperature and high chemical durability.

Wolf, G.A.; Kupfer, M.J.

1980-12-19T23:59:59.000Z

45

Glass fiber contamination of cigarette filters: an additional health risk to the smoker?  

Science Journals Connector (OSTI)

Articles Glass fiber contamination of cigarette filters...cigarette-appearing smoking article labeled Eclipse with glass fibers, fragments, and particles. Eclipse...insulated and bound with two wrapping mats of glass fibers. Recently, Eclipse has been modified...

J L Pauly; H J Lee; E L Hurley; K M Cummings; J D Lesses; R J Streck

1998-11-01T23:59:59.000Z

46

Extrinsic fiber optic displacement sensors and displacement sensing systems  

DOE Patents [OSTI]

An extrinsic Fizeau fiber optic sensor comprises a single-mode fiber, used as an input/output fiber, and a multimode fiber, used purely as a reflector, to form an air gap within a silica tube that acts as a Fizeau cavity. The Fresnel reflection from the glass/air interface at the front of the air gap (reference reflection) and the reflection from the air/glass interface at the far end of the air gap (sensing reflection) interfere in the input/output fiber. The two fibers are allowed to move in the silica tube, and changes in the air gap length cause changes in the phase difference between the reference reflection and the sensing reflection. This phase difference is observed as changes in intensity of the light monitored at the output arm of a fused biconical tapered coupler. The extrinsic Fizeau fiber optic sensor behaves identically whether it is surface mounted or embedded, which is unique to the extrinsic sensor in contrast to intrinsic Fabry-Perot sensors. The sensor may be modified to provide a quadrature phase shift extrinsic Fizeau fiber optic sensor for the detection of both the amplitude and the relative polarity of dynamically varying strain. The quadrature light signals may be generated by either mechanical or optical means. A plurality of the extrinsic sensors may connected in cascade and multiplexed to allow monitoring by a single analyzer.

Murphy, Kent A. (Roanoke, VA); Gunther, Michael F. (Blacksburg, VA); Vengsarkar, Ashish M. (Scotch Plains, NJ); Claus, Richard O. (Christiansburg, VA)

1994-01-01T23:59:59.000Z

47

Nano-structured self-cleaning superhydrophobic glass  

E-Print Network [OSTI]

5. Optically transparent glass with vertically alignedcomposition of biosoluble glass fiber” Korean ApplicationS. Jin, “Optically Transparent Glass with Vertically Aligned

Kim, Jin Yeol

2010-01-01T23:59:59.000Z

48

Sealed fiber-optic bundle feedthrough  

DOE Patents [OSTI]

A sealed fiber-optic bundle feedthrough by which a multitude of fiber-optic elements may be passed through an opening or port in a wall or structure separating two environments at different pressures or temperatures while maintaining the desired pressure or temperature in each environment. The feedthrough comprises a rigid sleeve of suitable material, a bundle of individual optical fibers, and a resin-based sealing material that bonds the individual optical fibers to each other and to the rigid sleeve.

Tanner, Carol E. (Niles, MI)

2002-01-01T23:59:59.000Z

49

High pressure fiber optic sensor system  

DOE Patents [OSTI]

The present application provides a fiber optic sensor system. The fiber optic sensor system may include a small diameter bellows, a large diameter bellows, and a fiber optic pressure sensor attached to the small diameter bellows. Contraction of the large diameter bellows under an applied pressure may cause the small diameter bellows to expand such that the fiber optic pressure sensor may measure the applied pressure.

Guida, Renato; Xia, Hua; Lee, Boon K; Dekate, Sachin N

2013-11-26T23:59:59.000Z

50

Assessing Deterioration of ADSS Fiber Optic Cables  

E-Print Network [OSTI]

Assessing Deterioration of ADSS Fiber Optic Cables Due to Corona Discharge Final Project Report of ADSS Fiber Optic Cables Due to Corona Discharge Final Project Report George G. Karady, Project Leader-Supporting) fiber optic cables installed on high voltage lines. The high electric field on those lines generates

51

Interferometric fiber optic displacement sensor  

DOE Patents [OSTI]

A method is presented to produce a change in the optical path length in the gap between two single mode optical fibers proportional to the lateral displacement of either fiber end normal to its axis. This is done with the use of refraction or diffraction at the interface between a guiding and non-guiding media to change the direction of propagation of the light in the gap. A method is also presented for laying a waveguide on a cantilever so that the displacement of the tip of the cantilever produces a proportional path length change in the gap by distancing the waveguide from the neutral axis of the cantilever. The fiber is supported as a cantilever or a waveguide is deposited on a micromachined cantilever and incorporated in an interferometer which is made totally on a silicon substrate with the use of integrated-optic technology. A resonant element in the form of a micro-bridge is incorporated in the ridge waveguide and produces a frequency output which is readily digitizeable and immune to laser frequency noise. Finally, monolithic mechanical means for phase modulation are provided on the same sensor substrate. This is done by vibrating the cantilever or micro-bridge either electrically or optically. 29 figs.

Farah, J.

1995-05-30T23:59:59.000Z

52

Color-center dynamics in a lead glass fiber  

Science Journals Connector (OSTI)

We report on the formation of color centers in a lead glass fiber through two-photon absorption of a laser at 532 nm. The color centers can subsequently be photobleached by a weaker...

DeLong, K W; Saifi, M A; Andrejco, M J; Mizrahi, Victor; Stegeman, G I

1990-01-01T23:59:59.000Z

53

Integrated Optoelectronics in an Optical Fiber J. V. Badding*a,d  

E-Print Network [OSTI]

Integrated Optoelectronics in an Optical Fiber J. V. Badding*a,d , P. J. Saziob , V. Gopalanc.d , A,d , a Department of Chemistry, Pennsylvania State University, University Park, PA, USA 16802; b Optoelectronics optoelectronic function with glass optical fibers is discussed. A chemical vapor deposition (CVD)-like process

Gopalan, Venkatraman

54

Remotely readable fiber optic compass  

DOE Patents [OSTI]

A remotely readable fiber optic compass. A sheet polarizer is affixed to a magnet rotatably mounted in a compass body, such that the polarizer rotates with the magnet. The optical axis of the sheet polarizer is preferably aligned with the north-south axis of the magnet. A single excitation light beam is divided into four identical beams, two of which are passed through the sheet polarizer and through two fixed polarizing sheets which have their optical axes at right angles to one another. The angle of the compass magnet with respect to a fixed axis of the compass body can be determined by measuring the ratio of the intensities of the two light beams. The remaining ambiguity as to which of the four possible quadrants the magnet is pointing to is resolved by the second pair of light beams, which are passed through the sheet polarizer at positions which are transected by two semicircular opaque strips formed on the sheet polarizer. The incoming excitation beam and the four return beams are communicated by means of optical fibers, giving a remotely readable compass which has no electrical parts.

Migliori, Albert (Santa Fe, NM); Swift, Gregory W. (Los Alamos, NM); Garrett, Steven L. (Pebble Beach, CA)

1986-01-01T23:59:59.000Z

55

Germania-Based Core Optical Fibers  

Science Journals Connector (OSTI)

Germania-glass-based core silica glass cladding single-mode fibers (Delta n up to 0.143) with a minimum loss of 20 dB/km at 1.9 µm were fabricated by the modified chemical vapor...

Dianov, Evgeny M; Mashinsky, Valery M

2005-01-01T23:59:59.000Z

56

Long glass fiber orientation in thermoplastic composites using a model that accounts for the flexibility of the fibers  

E-Print Network [OSTI]

Long glass fiber orientation in thermoplastic composites using a model that accounts Mechanical properties of long glass fiber composites, used in various industrial applications, are dependant are explored to predict the orientation of long glass fibers in the concentrated regime that take the flexible

Wapperom, Peter

57

In Home Networking using Optical Fiber  

Science Journals Connector (OSTI)

Increased bandwidth requirements for in-home networks create opportunities for optical fiber interconnects. We outline the requirements for in-home networking and discuss the...

Ten, Sergey

58

Solar Day-Lighting Using Optical Fibers  

Science Journals Connector (OSTI)

Green lighting alternatives can substantially reduce electricity consumption. Solar day-lighting system, by transporting the concentrated sunlight through optical fibers, has been...

Kumar, Naveen; Patil, Sanket

59

Fiber-optic liquid level sensor  

DOE Patents [OSTI]

A fiber-optic liquid level sensor measures the height of a column of liquid through the hydrostatic pressure it produces. The sensor employs a fiber-optic displacement sensor to detect the pressure-induced displacement of the center of a corrugated diaphragm.

Weiss, Jonathan D. (Albuquerque, NM)

1991-01-01T23:59:59.000Z

60

Optical fibers go nano The manufacture of nanowires from optical fibers provides the longest, most uniform  

E-Print Network [OSTI]

Optical fibers go nano The manufacture of nanowires from optical fibers provides the longest, most uniform and robust nanowires. Most important, the low optical loss associated to small surface roughness and high homogeneity allows the use of nanowires for optical applications and opens the way to a host

Note: This page contains sample records for the topic "optical glass fibers" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Rugged fiber optic probe for raman measurement  

DOE Patents [OSTI]

An optical probe for conducting light scattering analysis is disclosed. The probe comprises a hollow housing and a probe tip. A fiber assembly made up of a transmitting fiber and a receiving bundle is inserted in the tip. A filter assembly is inserted in the housing and connected to the fiber assembly. A signal line from the light source and to the spectrometer also is connected to the filter assembly and communicates with the fiber assembly. By using a spring-loaded assembly to hold the fiber connectors together with the in-line filters, complex and sensitive alignment procedures are avoided. The close proximity of the filter assembly to the probe tip eliminates or minimizes self-scattering generated by the optical fiber. Also, because the probe can contact the sample directly, sensitive optics can be eliminated.

O'Rourke, Patrick E. (Martinez, GA); Toole, Jr., William R. (Aiken, SC); Nave, Stanley E. (Evans, GA)

1998-01-01T23:59:59.000Z

62

Fiber optic D dimer biosensor  

DOE Patents [OSTI]

A fiber optic sensor for D dimer (a fibrinolytic product) can be used in vivo (e.g., in catheter-based procedures) for the diagnosis and treatment of stroke-related conditions in humans. Stroke is the third leading cause of death in the United States. It has been estimated that strokes and stroke-related disorders cost Americans between $15-30 billion annually. Relatively recently, new medical procedures have been developed for the treatment of stroke. These endovascular procedures rely upon the use of microcatheters. These procedures could be facilitated with this sensor for D dimer integrated with a microcatheter for the diagnosis of clot type, and as an indicator of the effectiveness, or end-point of thrombolytic therapy.

Glass, Robert S. (Livermore, CA); Grant, Sheila A. (Pleasanton, CA)

1999-01-01T23:59:59.000Z

63

Characterization of Fiber Optic CMM Probe System  

SciTech Connect (OSTI)

This report documents a study completed on the fiber optic probe system that is a part of the Werth optical CMM. This study was necessary due to a lack of documentation from the vendor for the proper use and calibration of the fiber probe, and was performed in support of the Lithographie Galvanoformung Abformung (LIGA) development program at the FM&T. As a result of this study, a better understanding of the fiber optic probe has been developed, including guidelines for its proper use and calibration.

K.W.Swallow

2007-05-15T23:59:59.000Z

64

Microbend fiber-optic chemical sensor  

DOE Patents [OSTI]

A microbend fiber-optic chemical sensor for detecting chemicals in a sample, and a method for its use, is disclosed. The sensor comprises at least one optical fiber having a microbend section (a section of small undulations in its axis), for transmitting and receiving light. In transmission, light guided through the microbend section scatters out of the fiber core and interacts, either directly or indirectly, with the chemical in the sample, inducing fluorescence radiation. Fluorescence radiation is scattered back into the microbend section and returned to an optical detector for determining characteristics of the fluorescence radiation quantifying the presence of a specific chemical.

Weiss, Jonathan D. (Albuquerque, NM)

2002-01-01T23:59:59.000Z

65

Side-emitting fiber optic position sensor  

DOE Patents [OSTI]

A side-emitting fiber optic position sensor and method of determining an unknown position of an object by using the sensor. In one embodiment, a concentrated beam of light source illuminates the side of a side-emitting fiber optic at an unknown axial position along the fiber's length. Some of this side-illuminated light is in-scattered into the fiber and captured. As the captured light is guided down the fiber, its intensity decreases due to loss from side-emission away from the fiber and from bulk absorption within the fiber. By measuring the intensity of light emitted from one (or both) ends of the fiber with a photodetector(s), the axial position of the light source is determined by comparing the photodetector's signal to a calibrated response curve, look-up table, or by using a mathematical model. Alternatively, the side-emitting fiber is illuminated at one end, while a photodetector measures the intensity of light emitted from the side of the fiber, at an unknown position. As the photodetector moves further away from the illuminated end, the detector's signal strength decreases due to loss from side-emission and/or bulk absorption. As before, the detector's signal is correlated to a unique position along the fiber.

Weiss, Jonathan D. (Albuquerque, NM)

2008-02-12T23:59:59.000Z

66

Fiber optic detector for immuno-testing  

DOE Patents [OSTI]

A portable fiber optic detector that senses the presence of specific target chemicals in air or a gas by exchanging the target chemical for a fluoroescently-tagged antigen that is bound to an antibody which is in turn attached to an optical fiber. Replacing the fluorescently-tagged antigen reduces the fluorescence so that a photon sensing detector records the reduced light level and activates an appropriate alarm or indicator.

Partin, Judy K. (Idaho Falls, ID); Ward, Thomas E. (Idaho Falls, ID); Grey, Alan E. (Idaho Falls, ID)

1992-01-01T23:59:59.000Z

67

Remote Fiber Laser Cutting System for Dismantling Glass Melter - 13071  

SciTech Connect (OSTI)

Since 2008, the equipment for dismantling the used glass melter has been developed in High-level Liquid Waste (HLW) Vitrification Facility in the Japanese Rokkasho Reprocessing Plant (RRP). Due to the high radioactivity of the glass melter, the equipment requires a fully-remote operation in the vitrification cell. The remote fiber laser cutting system was adopted as one of the major pieces of equipment. An output power of fiber laser is typically higher than other types of laser and so can provide high-cutting performance. The fiber laser can cut thick stainless steel and Inconel, which are parts of the glass melter such as casings, electrodes and nozzles. As a result, it can make the whole of the dismantling work efficiently done for a shorter period. Various conditions of the cutting test have been evaluated in the process of developing the remote fiber cutting system. In addition, the expected remote operations of the power manipulator with the laser torch have been fully verified and optimized using 3D simulations. (authors)

Mitsui, Takashi; Miura, Noriaki [IHI Corporation, 1 Shin-Nakahara-cho, Isogo-ku, Yokohama, Kanagawa (Japan)] [IHI Corporation, 1 Shin-Nakahara-cho, Isogo-ku, Yokohama, Kanagawa (Japan); Oowaki, Katsura; Kawaguchi, Isao [IHI Inspection and Instrumentation Co., Ltd, 1 Shin-Nakahara-cho, Isogo-ku, Yokohama, Kanagawa (Japan)] [IHI Inspection and Instrumentation Co., Ltd, 1 Shin-Nakahara-cho, Isogo-ku, Yokohama, Kanagawa (Japan); Miura, Yasuhiko; Ino, Tooru [Japan Nuclear Fuel Limited, 4-108, Aza Okitsuke, Oaza Obuchi, Rokkasho-Mura, Kamikita-gun, Aomori (Japan)] [Japan Nuclear Fuel Limited, 4-108, Aza Okitsuke, Oaza Obuchi, Rokkasho-Mura, Kamikita-gun, Aomori (Japan)

2013-07-01T23:59:59.000Z

68

Delamination at Thick Ply Drops in Carbon and Glass Fiber Laminates Under Fatigue Loading  

E-Print Network [OSTI]

1 Delamination at Thick Ply Drops in Carbon and Glass Fiber Laminates Under Fatigue Loading Daniel in composites with thickness tapering has been a concern in applications of carbon fibers. This study explored the resistance to delamination under fatigue loading of carbon and glass fiber prepreg laminates with the same

69

Fiber coupled optical spark delivery system  

DOE Patents [OSTI]

A spark delivery system for generating a spark using a laser beam is provided, the spark delivery system including a laser light source and a laser delivery assembly. The laser delivery assembly includes a hollow fiber and a launch assembly comprising launch focusing optics to input the laser beam in the hollow fiber. In addition, the laser delivery assembly includes exit focusing optics that demagnify an exit beam of laser light from the hollow fiber, thereby increasing the intensity of the laser beam and creating a spark. In accordance with embodiments of the present invention, the assembly may be used to create a spark in a combustion engine. In accordance with other embodiments of the present invention, a method of using the spark delivery system is provided. In addition, a method of choosing an appropriate fiber for creating a spark using a laser beam is also presented.

Yalin, Azer (Fort Collins, CO); Willson, Bryan (Fort Collins, CO); Defoort, Morgan (Fort Collins, CO)

2008-08-12T23:59:59.000Z

70

Fiber laser coupled optical spark delivery system  

DOE Patents [OSTI]

A spark delivery system for generating a spark using a laser beam is provided, and includes a laser light source and a laser delivery assembly. The laser delivery assembly includes a hollow fiber and a launch assembly comprising launch focusing optics to input the laser beam in the hollow fiber. The laser delivery assembly further includes exit focusing optics that demagnify an exit beam of laser light from the hollow fiber, thereby increasing the intensity of the laser beam and creating a spark. Other embodiments use a fiber laser to generate a spark. Embodiments of the present invention may be used to create a spark in an engine. Yet other embodiments include collecting light from the spark or a flame resulting from the spark and conveying the light for diagnostics. Methods of using the spark delivery systems and diagnostic systems are provided.

Yalin, Azer (Fort Collins, CO); Willson, Bryan (Fort Collins, CO); Defoort, Morgan (Fort Collins, CO); Joshi, Sachin (Fort Collins, CO); Reynolds, Adam (Fort Collins, CO)

2008-03-04T23:59:59.000Z

71

Fiber optic probe for light scattering measurements  

DOE Patents [OSTI]

This invention is comprised of a fiber optic probe and a method for using the probe for light scattering analyses of a sample. The probe includes a probe body with an inlet for admitting a sample into an interior sample chamber, a first optical fiber for transmitting light from a source into the chamber, and a second optical fiber for transmitting light to a detector such as a spectrophotometer. The interior surface of the probe carries a coating that substantially prevents non-scattered light from reaching the second fiber. The probe is placed in a region where the presence and concentration of an analyte of interest are to be detected, and a sample is admitted into the chamber. Exciting light is transmitted into the sample chamber by the first fiber, where the light interacts with the sample to produce Raman-scattered light. At least some of the Raman- scattered light is received by the second fiber and transmitted to the detector for analysis. Two Raman spectra are measured, at different pressures. The first spectrum is subtracted from the second to remove background effects, and the resulting sample Raman spectrum is compared to a set of stored library spectra to determine the presence and concentration of the analyte.

Nave, S.E.; Livingston, R.R.; Prather, W.S.

1993-01-01T23:59:59.000Z

72

Fiber optic probe for light scattering measurements  

DOE Patents [OSTI]

A fiber optic probe and a method for using the probe for light scattering analyses of a sample. The probe includes a probe body with an inlet for admitting a sample into an interior sample chamber, a first optical fiber for transmitting light from a source into the chamber, and a second optical fiber for transmitting light to a detector such as a spectrophotometer. The interior surface of the probe carries a coating that substantially prevents non-scattered light from reaching the second fiber. The probe is placed in a region where the presence and concentration of an analyte of interest are to be detected, and a sample is admitted into the chamber. Exciting light is transmitted into the sample chamber by the first fiber, where the light interacts with the sample to produce Raman-scattered light. At least some of the Raman-scattered light is received by the second fiber and transmitted to the detector for analysis. Two Raman spectra are measured, at different pressures. The first spectrum is subtracted from the second to remove background effects, and the resulting sample Raman spectrum is compared to a set of stored library spectra to determine the presence and concentration of the analyte.

Nave, Stanley E. (Evans, GA); Livingston, Ronald R. (Aiken, SC); Prather, William S. (Augusta, GA)

1995-01-01T23:59:59.000Z

73

Hot Springs-Garrison Fiber Optic Project  

SciTech Connect (OSTI)

Bonneville Power Administration (BPA) is proposing to upgrade its operational telecommunications system between the Hot Springs Substation and the Garrison Substation using a fiber optic system. The project would primarily involve installing 190 kilometers (120 miles) of fiber optic cable on existing transmission structures and installing new fiber optic equipment in BPA`s substation yards and control houses. BPA prepared an environmental assessment (EA) evaluating the proposed action. This EA was published in October 1994. The EA identifies a number of minor impacts that might occur as a result of the proposed action, as well as some recommended mitigation measures. This Mitigation Action Plan (MAP) identifies specific measures to avoid, minimize, or compensate for impacts identified in the EA.

Not Available

1994-10-01T23:59:59.000Z

74

Concentric core optical fiber with multiple-mode signal transmission  

DOE Patents [OSTI]

A concentric core optical fiber provides for the simultaneous but independent transmission of signals over a single optical fiber. The concentric optical fiber is constructed of a single-mode or multimode inner optical fiber defined by a core and a cladding of a lower index of refraction than the core and an outer optical fiber defined by additional cladding concentrically disposed around the cladding and of an index of refraction lower than the first mentioned cladding whereby the latter functions as the core of the outer optical fiber. By employing such an optical fiber construction with a single-mode inner core or optical fiber, highly sensitive interferometric and stable less sensitive amplitude based sensors can be placed along the same length of a concentric core optical fiber. Also, by employing the concentric core optical fiber secure telecommunications can be achieved via the inner optical fiber since an intrusion of the concentric optical fiber will first cause a variation in the light being transmitted through the outer optical fiber and this variation of light being used to trigger a suitable alarm indicative of the intrusion.

Muhs, Jeffrey D. (Lenoir City, TN)

1997-01-01T23:59:59.000Z

75

Triangularly phase-modulated optical fiber ring resonator sensor  

Science Journals Connector (OSTI)

An optical fiber ring resonatory sensor system has been demonstrated by applying a triangular phase modulation signal to a fiber loop. The dynamic range for detection of optical phase...

Chien, Pie-Yau; Pan, Ci-Ling

1992-01-01T23:59:59.000Z

76

Optical fiber sensors for smart materials characterization  

SciTech Connect (OSTI)

Optical and optical fiber methods may be used to characterize materials and structures. Their advantages for such applications include their immunity to electromagnetic interference, high sensitivity, resolution and dynamic range, and ability to operate in harsh environmental conditions. This paper describes the application of such methods to the characterization of smart materials and structures during their fabrication, in-service lifetime, and damage and degradation.

Claus, R.O. [Virginia Polytechnic Inst. and State Univ., Blacksburg, VA (United States). Electrical Engineering Dept.

1994-12-31T23:59:59.000Z

77

Seismic damage identification for steel structures using distributed fiber optics  

Science Journals Connector (OSTI)

A distributed fiber optic monitoring methodology based on optic time domain reflectometry technology is developed for seismic damage identification of steel structures. Epoxy with a...

Hou, Shuang; Cai, C S; Ou, Jinping

2009-01-01T23:59:59.000Z

78

STABILITY PROPERTIES OF LIGHT PROPAGATING IN FIBER OPTICS  

E-Print Network [OSTI]

STABILITY PROPERTIES OF LIGHT PROPAGATING IN FIBER OPTICS ST´EPHANE LAFORTUNE Summary The study is crucial in applications such as lasers and optical fibers. In this proposal I will focus on a model of fiber optics: the Manakov system. This system consists of two differential equations, that is two

Kasman, Alex

79

Planar waveguide obtained by burying a Ge22As20Se58 fiber in As2S3 glass  

E-Print Network [OSTI]

Planar waveguide obtained by burying a Ge22As20Se58 fiber in As2S3 glass Quentin Coulombier glasses. Two highly mature chalcogenide glasses are used for these experiments. GASIR glass from Umicore IR Glass, Olen, Belgium, with the composition of Ge22As20Se58 is used to draw fibers

Paris-Sud XI, Université de

80

Resin infusion analysis of nanoclay filled glass fiber laminates  

Science Journals Connector (OSTI)

Abstract This paper focuses on the resin flow characteristics of nanoclay filled glass fiber laminates processed by Vacuum Assisted Resin Infusion Molding (VARIM). Laminates with varying quantities of nanoclays (0–5 wt.%) were prepared and the effect of these nanoclays on the epoxy resin flow characteristics was studied. It was found that the flow rate of resin continuously decreased as nanoclay content continuously increased. The reduction in the flow rate was attributed to the rate of change of curing and the subsequent change in viscosity of the nanoclay filled resin. Analysis of infusion process by Darcy’s law show that the permeability of the fiber decreased in the nanoclay filled resin system. Nanoclay filled laminates show improved static and dynamic mechanical properties than that of unfilled resin composites.

K. Kanny; T.P. Mohan

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "optical glass fibers" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

Fiber optic assembly and method of making same  

DOE Patents [OSTI]

There is provided an assembly having a light guiding medium sealed to a holder. Preferably the holder is a metal shell and a light guiding medium is an optical fiber of glass or sapphire whisker. The assembly includes a sealing medium which sealingly engages the metal holder to the fiber. In the formation of the assembly, the seal is essentially hermetic having a capability of minimizing leakage having a helium leak rate of less than 1{times}10{sup {minus}8} cubic centimeters per second and high strength having a capability of withstanding pressures of 100,000 psi or greater. The features of the assembly are obtained by a specific preparation method and by selection of specific starting materials. The fiber is selected to have a sufficiently high coefficient of thermal expansion which minimizes strains in the component during fabrication, as a result of fabrication, and during use. The other components are selected to be of a material having compatible coefficients of thermal expansion (TEC) where the TEC of the holder is greater than or equal to the TEC of the sealing material. The TEC of the sealing material is in turn greater than or equal to the TEC of the fiber. It is preferred that the materials be selected so that their respective coefficients of thermal expansion are as close as possible to one another and they may all be equal. 4 figs.

Kramer, D.P.; Beckman, T.M.

1997-09-02T23:59:59.000Z

82

Optical glass polishing by controlled laser surface-heat treatment  

Science Journals Connector (OSTI)

It is shown that optical surfaces traditionally ground in conventional glasses with high coefficients of thermal expansion may be polished by irradiation with a space- and...

Laguarta, F; Lupon, N; Armengol, J

1994-01-01T23:59:59.000Z

83

ON THE GAGE FACTOR FOR OPTICAL FIBER GRATING STRAIN GAGES  

E-Print Network [OSTI]

of grating and fiber types. KEY WORDS: Fiber-Optic Gratings, Fiber-Optic Sensors, Strain Gage Factor 1 theoretical background. Then, in Section 3, we discuss measurement methods followed by the experimental tests and results in Section 4, before concluding in Section 5. 2. THEORETICAL BACKGROUND Consider an FBG fabricated

Park, Yong-Lae

84

Fiber optic hydrophone sensor arrays using low reflectance internal mirrors  

E-Print Network [OSTI]

A new design of fiber optic hydrophone sensor arrays phics. using low reflectance internal mirrors in optical fibers is investigated. The mirrors are produced by fusion arc splicing of two fibers, one of which has a thin film of TiO2 on the end. A...

Lee, Jong-Seo

2012-06-07T23:59:59.000Z

85

Low-Cost Fiber Optic Pressure Sensor  

DOE Patents [OSTI]

The size and cost of fabricating fiber optic pressure sensors is reduced by fabricating the membrane of the sensor in a non-planar shape. The design of the sensors may be made in such a way that the non-planar membrane becomes a part of an air-tight cavity, so as to make the membrane resilient due to the air-cushion effect of the air-tight cavity. Such non-planar membranes are easier to make and attach.

Sheem, Sang K. (Pleasanton, CA)

2003-07-22T23:59:59.000Z

86

Low-Cost Fiber Optic Pressure Sensor  

DOE Patents [OSTI]

The size and cost of fabricating fiber optic pressure sensors is reduced by fabricating the membrane of the sensor in a non-planar shape. The design of the sensors may be made in such a way that the non-planar membrane becomes a part of an air-tight cavity, so as to make the membrane resilient due to the air-cushion effect of the air-tight cavity. Such non-planar membranes are easier to make and attach.

Sheem, Sang K. (Pleasanton, CA)

2004-05-18T23:59:59.000Z

87

Optical glass and glass ceramic historical aspects and recent developments: a Schott view  

Science Journals Connector (OSTI)

Since the time of Galilei 400 years ago the progress of optical systems was restricted due to the lack of optical glass types with different dispersion properties and due to poor...

Hartmann, Peter; Jedamzik, Ralf; Reichel, Steffen; Schreder, Bianca

2010-01-01T23:59:59.000Z

88

Fiber optical assembly for fluorescence spectrometry  

DOE Patents [OSTI]

A system for analyzing a sample for the presence of an analyte in a sample. The system includes a sample holder for containing the sample; an excitation source, such as a laser, and at least one linear array radially disposed about the sample holder. Radiation from the excitation source is directed to the sample, and the radiation induces fluorescent light in the sample. Each linear array includes a plurality of fused silica optical fibers that receive the fluorescent light and transmits a fluorescent light signal from the first end to an optical end port of the linear array. An end port assembly having a photo-detector is optically coupled to the optical end port. The photo-detector detects the fluorescent light signal and converts the fluorescent light signal into an electrical signal.

Carpenter, II, Robert W. (Pagosa Springs, CO); Rubenstein, Richard (Staten Island, NY); Piltch, Martin (Los Alamos, NM); Gray, Perry (Los Alamos, NM)

2010-12-07T23:59:59.000Z

89

12/22/2000 State of Art Fiber Optic 1 UTILITY APPLICATION OF  

E-Print Network [OSTI]

12/22/2000 State of Art Fiber Optic 1 UTILITY APPLICATION OF FIBER OPTIC CABLES George G. Karady Fiber Optic 2 UTILITY APPLICATION OF FIBER OPTIC CABLES Utilities are installing fiber optic cables on high voltage transmission lines. Three basic designs employed are: · 1) OPGW (optical ground wire) · 2

90

Photosensitivity of optical fibers with extremely high germanium concentration  

Science Journals Connector (OSTI)

Writing and thermal annealing of fiber Bragg gratings (FBGs) in an optical fiber containing 75 mol.% GeO2 in the core have been studied by analyzing the first three...

Medvedkov, Oleg I; Vasiliev, Sergei A; Gnusin, Pavel I; Dianov, Evgeny M

2012-01-01T23:59:59.000Z

91

Vibration-insensitive fiber-optic current sensor  

Science Journals Connector (OSTI)

The measurement of the electric current with an optical fiber sensor can be made insensitive to external vibrations that act on the leading fiber by using a circuit involving a...

Pistoni, Natale C; Martinelli, Mario

1993-01-01T23:59:59.000Z

92

Implementation of a fiber-optic delay-line memory  

Science Journals Connector (OSTI)

The construction and operation of a 50-MHz 64 × 16 bit fiber-optic bit-serial delay-line memory is described. It consists of LiNbO3 directional coupler switches, fused-fiber...

Soukup, T J; Feuerstein, R J; Heuring, V P

1992-01-01T23:59:59.000Z

93

Hollow Core Fiber Optics for Mid-Wave and Long-Wave Infrared Spectroscopy  

SciTech Connect (OSTI)

The development and testing of hollow core glass waveguides (i.e., fiber optics) for use in Long-Wave Infrared (LWIR) spectroscopy systems is described. LWIR fiber optics are a key enabling technology needed to improve the utility and effectiveness of trace chemical detection systems based in the 8 to 12 micron region. This paper focuses on recent developments in hollow waveguide technology geared specifically for LWIR spectroscopy, including a reduction in both the length dependent loss and the bending loss while maintaining relatively high beam quality. Results will be presented from tests conducted with a Quantum Cascade Laser.

Kriesel, J.M.; Gat, N.; Bernacki, Bruce E.; Erikson, Rebecca L.; Cannon, Bret D.; Myers, Tanya L.; Bledt, Carlos M.; Harrington, J. A.

2011-06-01T23:59:59.000Z

94

Graphene-filled hollow optical fiber saturable absorber for efficient soliton fiber laser mode-locking  

Science Journals Connector (OSTI)

We demonstrate a novel in-line saturable absorber based on hollow optical fiber (HOF) filled with graphene composite for high power operation of mode-locked fiber laser. Evanescent...

Choi, Sun Young; Cho, Dae Kun; Song, Yong-Won; Oh, Kyunghwan; Kim, Kihong; Rotermund, Fabian; Yeom, Dong-Il

2012-01-01T23:59:59.000Z

95

Cost-Effective Side-Coupling Polymer Fiber Optics for Optical Interconnections  

Science Journals Connector (OSTI)

Potentially low-cost optical side-couplers embedded along a polymer optical fiber are demonstrated using etched micromirrors. Both serial and parallel mirror fabrication possibilities...

Li, Yao; Wang, Ting; Fasanella, Kenneth

1998-01-01T23:59:59.000Z

96

Characterization of commercial fiber optic connectors - Preliminary report  

SciTech Connect (OSTI)

Several types of commercial fiber optic connectors were characterized for potential use in a Sandia designed Laser Diode Ignition (LDI) system. The characterization included optical performance while the connectors were subjected to the more dynamic environmental conditions experienced in weapons applications. The environmental testing included temperature cycling, random vibration, and mechanical shock. This report presents a performance assessment of the fiber optic connectors and fiber included in the characterization. The desirable design features are described for a fiber optic connector that must survive the dynamic environment of weapon systems. The more detailed performance of each connector type will be included as resources permit.

Andrews, Larry A.; Williams, Randy J.

1998-09-01T23:59:59.000Z

97

Mechanism of Type IIA Photosensitivity in Optical Fibers  

Science Journals Connector (OSTI)

Formation of the type IIA Bragg gratings in germanosilicate optical fibers is studied. A mechanism for the type IIA photosensitivity is proposed which is based on nucleation and...

Shlyagin, Mikhail; Kukushkin, Sergei

98

Optical fiber sensor for membrane submicrometer vibration measurement  

Science Journals Connector (OSTI)

This paper presents an optical fiber sensor for membrane submicrometer vibration measurement. The sensor is designed ultimately for low-cost medical audiometric applications such as...

Prokopczuk, Krzysztof; Rozwadowski, Krzysztof; Aleksandra Starzy?ska, M D; Doma?ski, Andrzej W

2014-01-01T23:59:59.000Z

99

COURSE SYLLABUS OSE 4470 FALL 2014 `FIBER-OPTIC COMMUNICATIONS'  

E-Print Network [OSTI]

of optical fiber communication systems including the optoelectronic devices used in transmitters) Optoelectronic devices used in transmitters, receivers, and multiplexers. 3) Design of the overall communication

Van Stryland, Eric

100

Fiber optic diagnostic techniques for the electrical discharge machining process.  

E-Print Network [OSTI]

??Plasma sparks from an electrical discharge machining phics. (EDM) process were observed using fiber optics positioned the dielectric oil. New measurement techniques were developed to… (more)

Pillans, Brandon William

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "optical glass fibers" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

A cantilever optical-fiber accelerometer  

Science Journals Connector (OSTI)

A simple fiber-optic acceleration sensor has been designed and evaluated. It is an amplitude-modulation sensor, which employs inexpensive electronic instrumentation. The construction and technology of the sensor are presented. The influence of some construction parameters on sensor characteristics has been considered and measured. It is proved that simple construction modifications allow some sensor parameters to be tuned. The sensor characteristic is nonlinear. The amplitude-modulation depth reaches 50% at an acceleration of 250 m/s2 for a cantilever length of 40 mm. The maximum operating frequency is dependent on cantilever length and for length 20 mm is 125 Hz.

Jerzy Kalenik; Ryszard Paj?k

1998-01-01T23:59:59.000Z

102

Programmable optic-fiber delay line  

E-Print Network [OSTI]

. It can supply up to 2 Amp continuous output current with an output short circuit. The thermo-electric cooler (TEC) from Marlow Industries, Inc. can heat or cool material depending on the direction of the electric current driving it. The two input... the fusion. 16 Optical Fiber Electrode V-groove Fig. 5 Basic configuration of electric arc fusion splicer. In order to better understand the fusion process used in fabrication of the Mach-Zender interferometer, especially the available SIECOR model m...

Fang, Shin-Puu

1991-01-01T23:59:59.000Z

103

Experimental investigation on the durability of glass fiber-reinforced polymer composites containing nanocomposite  

Science Journals Connector (OSTI)

Nanoclay layers incorporated into polymer/clay nanocomposites can inhibit the harmful penetration of water and chemicals into the material, and thus the durability of glass fiber-reinforced polymer (GFRP) composites should be enhanced by using polymer/clay ...

Weiwen Li, Chunyang Ji, Honggang Zhu, Feng Xing, Jiaxin Wu, Xueli Niu

2013-01-01T23:59:59.000Z

104

Tests of concrete beams with externally-bonded glass-fiber fabric web reinforcement  

E-Print Network [OSTI]

of strengthening techniques used for rehabilitation of concrete structures is the method of using thin glass and carbon fiber fabrics, which are bonded externally to the surface of concrete. The study is focused on investigating the feasibility of using fabrics...

Dabholkar, Niranjan Shamsunder

2012-06-07T23:59:59.000Z

105

Portland cement mortar modified with latex and fiber glass for thin shell construction  

E-Print Network [OSTI]

with latex and fiber glass as a covering material for thin shell structures. Tests were conducted on various formulations to determine certain physical properties of the modified portland cement. Application techniques were investigated to determine...

Raymond, Jewell Duane

1963-01-01T23:59:59.000Z

106

Grizzly Substation Fiber Optics : Environmental Assessment.  

SciTech Connect (OSTI)

This notice announces BPA`s decision to construct, operate, and maintain the Grizzly Substation Fiber Optic Project (Project). This Project is part of a continuing effort by BPA to complete a regionwide upgrade of its existing telecommunications system. The US Forest Service and BPA jointly prepared the Grizzly Substation Fiber Optic Project Environmental Assessment (EA) (DOE/EA-1241) evaluating the potential environmental impacts of the Proposed Action, the Underground Installation Alternative, and the No Action Alternative. Based on the analysis in the EA, the US Forest Service and BPA have determined that the Proposed Action is not a major Federal action significantly affecting the quality of the human environment, within the meaning of the National Environmental Policy Act (NEPA) of 1969. Therefore, the preparation of an Environmental Impact Statement (EIS) is not required and BPA is issuing this FONSI. The US Forest Service has separately issued a FONSI and Decision Notice authorizing BPA to construct, operate, and maintain the Project within the Crooked River National Grassland (Grassland).

United States. Bonneville Power Administration.

1998-02-01T23:59:59.000Z

107

Fabry-Perot fiber optic sensor using multimode laser diode  

E-Print Network [OSTI]

heating and cooling cycles. Also, a sporadic waveform on top of the periodic waveform is observed. This is due to mechanical drift in the feedback loop between the thermoelectric cooler and the temperature controller as previously mentioned. Fig. 11... fiber and later reaches a transducer, which takes the form of an integrated optics device, bulk optical components or a fiber optic device, placed within the sensing environment. The optical signal is modulated within the sensing region...

Chu, Siu Yi Andrew

1993-01-01T23:59:59.000Z

108

Intrinsic Fabry-Perot optical fiber sensors and their multiplexing  

DOE Patents [OSTI]

An intrinsic Fabry-Perot optical sensor includes a thin film sandwiched between two fiber ends. When light is launched into the fiber, two reflections are generated at the two fiber/thin film interfaces due to a difference in refractive indices between the fibers and the film, giving rise to the sensor output. In another embodiment, a portion of the cladding of a fiber is removed, creating two parallel surfaces. Part of the evanescent fields of light propagating in the fiber is reflected at each of the surfaces, giving rise to the sensor output. In a third embodiment, the refractive index of a small portion of a fiber is changed through exposure to a laser beam or other radiation. Interference between reflections at the ends of the small portion give rise to the sensor output. Multiple sensors along a single fiber are multiplexed using an optical time domain reflectometry method.

Wang, Anbo (Blacksburg, VA)

2007-12-11T23:59:59.000Z

109

Introduction The Fiber-Lite MI-150 is a 150 Watt quartz halogen fiber optic illuminator designed for general microscopy  

E-Print Network [OSTI]

Introduction ® The Fiber-Lite MI-150 is a 150 Watt quartz halogen fiber optic illuminator designed for general microscopy use. When used with specialty fiber optic cables the MI-150 illuminator can also Illuminator from the carton and retain the manual and any additional documents. ! Remove the fiber optic cable

Kleinfeld, David

110

Fiber-optic oxygen sensor using molybdenum chloride cluster luminescence  

E-Print Network [OSTI]

Fiber-optic oxygen sensor using molybdenum chloride cluster luminescence Ruby N. Ghosh,a) Gregory L on a reflection-mode fiber-optic oxygen sensor based on the 3 O2 quenching of the red emission from hexanuclear molybdenum chloride clusters. Measurements of the probe operating in a 0%­21% gaseous oxygen environment have

Ghosh, Ruby N.

111

Fiber coupling with adaptive optics for free-space optical communication Thomas Weyraucha  

E-Print Network [OSTI]

Fiber coupling with adaptive optics for free-space optical communication Thomas Weyraucha , Mikhail, Department of Manufacturing Engineering, Brookline, MA 02446 ABSTRACT We describe an adaptive optical fiber coupling system for free-space optical communication comprising a micro- electromechanical deformable

112

High-Efficiency Solar Cogeneration with TPV & Fiber-Optic Daylighting...  

Broader source: Energy.gov (indexed) [DOE]

High-Efficiency Solar Cogeneration with TPV & Fiber-Optic Daylighting High-Efficiency Solar Cogeneration with TPV & Fiber-Optic Daylighting Lead Performer: Creative Light Source,...

113

All-optical interferometric switches for data regeneration in fiber optic networks  

E-Print Network [OSTI]

In the thirty years since the installation of the first fiber optic data link, data rates in installed fiber links have risen from a few Mb/s to tens of Gb/s. In the laboratory, data rates in a single optical fiber have ...

Savage, Shelby Jay, 1978-

2007-01-01T23:59:59.000Z

114

120 Years of Optical Glass Science  

Science Journals Connector (OSTI)

An elegant, century-old mathematical relationship, tying the physical properties of a multicomponent glass to those of its chemical components, still provides a powerful tool...

Dragic, Peter D; Ballato, John

2014-01-01T23:59:59.000Z

115

Soranakom, C., Yekani-Fard, M., and Mobasher, B., "Modeling of Aging Response in Glass Fiber Reinforced Concrete Flexural Specimens," 15th International Glass Fibre Reinforced  

E-Print Network [OSTI]

Congress, GRC 2008, CD-Proceedings, Prague, April 20-23, 2008 1 Modeling of Aging Response in Glass Fiber caused by the chemical and physical processes. Glass fibers chemically degrade in the alkaline hydrated approach for GFRC is possible. The 1 Graduate Research Assistant Department of Civil and Environmental

Mobasher, Barzin

116

Durability of E-glass fiber reinforced vinyl ester polymer composites with nanoclay in an alkaline environment.  

E-Print Network [OSTI]

??This study was conducted to determine the effect of clay content in the GFRP (glass fiber reinforced polymer) composite samples as they are aged in… (more)

Ravindran, Naveenkamal.

2005-01-01T23:59:59.000Z

117

Methods and apparatus for optical switching using electrically movable optical fibers  

DOE Patents [OSTI]

Methods and apparatuses for electrically controlled optical switches are presented. An electrically controlled optical switch includes a fixture formed using a laminated dielectric material, a first optical fiber having a fixed segment supported by the fixture and a movable segment extending into a cavity, a second optical fiber having a fixed segment supported by the fixture and an extended segment where an optical interconnect may be established between the first optical fiber and the second optical fiber, and a first electrical actuator functionally coupled to the fixture and the first fiber which alters a position of the moveable segment, based upon a control signal, for changing a state of the optical interconnect between one of two states.

Peterson, Kenneth A. (Albuquerque, NM)

2007-03-13T23:59:59.000Z

118

Fiber-optic displacement sensor system  

E-Print Network [OSTI]

. Light pulses from a light emitting diode (LED) were coupled into a multimode fiber. The displacement of a mirror positioned near the end of the fiber was measured by monitoring the amplitude of the reflected pulses. A reference reflection from a.... Light pulses from a light emitting diode (LED) were coupled into a multimode fiber. The displacement of a mirror positioned near the end of the fiber was measured by monitoring the amplitude of the reflected pulses. A reference reflection from a...

Cava, Norayda Nora

2012-06-07T23:59:59.000Z

119

Effect of optically modified polyethylene terephthalate fiber socks on chronic foot pain  

E-Print Network [OSTI]

of optically modified polyethylene terephthalate fiber sockswhether socks made from polyethylene terephthalate (PET)

York, Robyn MB; Gordon, Ian L

2009-01-01T23:59:59.000Z

120

Optical fiber-based fluorescent viscosity sensor Mark A. Haidekker and Walter J. Akers  

E-Print Network [OSTI]

Optical fiber-based fluorescent viscosity sensor Mark A. Haidekker and Walter J. Akers Department bound to a fiber-optic tip without loss of viscosity sensi- tivity. The optical fiber itself may be used to molecular rotors in solution. An optical fiber-based fluorescent vis- cosity sensor may be used in real

Theodorakis, Emmanuel

Note: This page contains sample records for the topic "optical glass fibers" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

Method for forming hermetic coatings for optical fibers  

DOE Patents [OSTI]

A method for forming hermetic coatings on optical fibers by hot filament assisted chemical vapor deposition advantageously produces a desirable coating while maintaining the pristine strength of the pristine fiber. The hermetic coatings may be formed from a variety of substances, such as, for example, boron nitride and carbon.

Michalske, Terry A. (P.O. Box 1042, Cedar Crest, NM 87008); Rye, Robert R. (1304 Espanola NE., Albuquerque, NM 87110); Smith, William L. (9916 Fostoria Rd., NE., Albuquerque, NM 87111)

1993-01-01T23:59:59.000Z

122

Progress in Fiber Optical Acoustic and Seismic Sensing  

Science Journals Connector (OSTI)

A review of the progress in fiber optic acoustic and seismic sensor systems is presented. Common advancements in areas such as multiplexing are covered as well as specific progress in...

Kirkendall, Clay; Cole, James H; Tveten, Alan B; Dandridge, Anthony

123

Fiber-optic gyroscopes based on polarization scrambling  

Science Journals Connector (OSTI)

A novel fiber-optic gyroscope with a single-mode diode laser as the light source and two polarization scramblers as time-varying depolarizers is demonstrated. This arrangement reduces...

Chien, Pie-Yau; Pan, Ci-Ling

1991-01-01T23:59:59.000Z

124

Fiber-optic voltage sensor with cladded fiber and evanescent wave variation detection  

DOE Patents [OSTI]

A fiber optic voltage sensor is described which includes a source of light, a reference fiber for receiving a known percentage of the light and an electrostrictive element having terminals across which is applied, a voltage to be measured. The electrostrictive element is responsive to the applied voltage to assume an altered physical state. A measuring fiber also receives a known percentage of light from the light source and is secured about the electrostrictive element. The measuring fiber is provided with a cladding and exhibits an evanescent wave in the cladding. The measuring fiber has a known length which is altered when the electrostrictive element assumes its altered physical state. A differential sensor is provided which senses the intensity of light in both the reference fiber and the measuring fiber and provides an output indicative of the difference between the intensities. 3 figs.

Wood, C.B.

1992-12-15T23:59:59.000Z

125

Fiber-optic voltage sensor with cladded fiber and evanescent wave variation detection  

DOE Patents [OSTI]

A fiber optic voltage sensor is described which includes a source of light, a reference fiber for receiving a known percentage of the light and an electrostrictive element having terminals across which is applied, a voltage to be measured. The electrostrictive element is responsive to the applied voltage to assume an altered physical state. A measuring fiber also receives a known percentage of light from the light source and is secured about the electrostrictive element. The measuring fiber is provided with a cladding and exhibits an evanescent wave in the cladding. The measuring fiber has a known length which is altered when the electrostrictive element assumes its altered physical state. A differential sensor is provided which senses the intensity of light in both the reference fiber and the measuring fiber and provides an output indicative of the difference between the intensities.

Wood, Charles B. (Lakewood, CO)

1992-01-01T23:59:59.000Z

126

Fiber optic diagnostic techniques for the electrical discharge machining process  

E-Print Network [OSTI]

FIBER OPTIC DIAGNOSTIC TECHNIQUES FOR THE ELECTRICAL DISCHARGE MACHINING PROCESS A Thesis by BRANDON WILLIAM PILLANS Submitted to the Office of Graduate Studies of Texas AB M University in partial fulfillment of the requirements... for the degree of MASTER OF SCIENCE August t 998 Major Subject: Electrical Engineering FIBER OPTIC DIAGNOSTIC TECHNIQUES FOR THE ELECTRICAL DISCHARGE MACHINING PROCESS A Thesis by BRANDON WILLIAM PILLANS Submitted to Texas A8M University in partial...

Pillans, Brandon William

2012-06-07T23:59:59.000Z

127

EMI shield enhancement through the addition of copper coated glass fibers  

E-Print Network [OSTI]

E. , University of Wisconsin-Madison Chair of Committee: Dr. G. W. Halldin This research investigated the feasibility of using copper coated glass fibers to increase the EMI shielding characteristics of vinyl ester thermosetting resin. The fibers were coated... 35 36 37 41 41 48 55 57 58 58 58 58 60 61 62 62 62 Plate Times. Surface Area Analysis Scanning Electron Microscopy. MOLDED COMPOSITE MATERIALS. Resin. Sample Preparation. Evaluation. Scanning Electron Microscopy Flexural...

Montanye, Jeffrey Richard

1988-01-01T23:59:59.000Z

128

Use of a fiber optic probe for organic species determination  

DOE Patents [OSTI]

A fiber optic probe for remotely detecting the presence and concentration organic species in aqueous solutions. The probe includes a cylindrical housing with an organic species indicator, preferably diaminonaphthyl sulfonic acid adsorbed in a silica gel (DANS-modified gel), contained in the probe's distal end. The probe admits aqueous solutions to the probe interior for mixing within the DANS-modified gel. An optical fiber transmits light through the DANS-modified gel while the indicator reacts with organic species present in the solution, thereby shifting the location of the fluorescent peak. The altered light is reflected to a receiving fiber that carries the light to a spectrophotometer or other analysis device.

Ekechukwu, Amy A. (Augusta, GA)

1996-01-01T23:59:59.000Z

129

Fiber optic probe having fibers with endfaces formed for improved coupling efficiency and method using same  

DOE Patents [OSTI]

A fiber optic probe for detecting scattered light, with transmitting and receiving fibers having slanted ends and bundled together to form a bevel within the tip of the probe. The probe comprises a housing with a transparent window across its tip for protecting the transmitting and receiving fibers held therein. The endfaces of the fibers are slanted, by cutting, polishing and the like, so that they lie in a plane that is not perpendicular to the longitudinal axis of the respective fiber. The fibers are held in the tip of the probe using an epoxy and oriented so that lines normal to the slanted endfaces are divergent with respect to one another. The epoxy, which is positioned substantially between the transmitting and receiving fibers, is tapered so that the transmitting fiber, the epoxy and the receiving fiber form a bevel of not more than 20 degrees. The angled fiber endfaces cause directing of the light cones toward each other, resulting in improved light coupling efficiency. A light absorber, such as carbon black, is contained in the epoxy to reduce crosstalk between the transmitting and receiving fibers.

O'Rourke, Patrick E. (Martinez, GA); Livingston, Ronald R. (Aiken, SC)

1995-01-01T23:59:59.000Z

130

Fiber optic probe having fibers with endfaces formed for improved coupling efficiency and method using same  

DOE Patents [OSTI]

A fiber optic probe is disclosed for detecting scattered light, with transmitting and receiving fibers having slanted ends and bundled together to form a bevel within the tip of the probe. The probe comprises a housing with a transparent window across its tip for protecting the transmitting and receiving fibers held therein. The endfaces of the fibers are slanted, by cutting, polishing and the like, so that they lie in a plane that is not perpendicular to the longitudinal axis of the respective fiber. The fibers are held in the tip of the probe using an epoxy and oriented so that lines normal to the slanted endfaces are divergent with respect to one another. The epoxy, which is positioned substantially between the transmitting and receiving fibers, is tapered so that the transmitting fiber, the epoxy and the receiving fiber form a bevel of not more than 20 degrees. The angled fiber endfaces cause directing of the light cones toward each other, resulting in improved light coupling efficiency. A light absorber, such as carbon black, is contained in the epoxy to reduce crosstalk between the transmitting and receiving fibers. 3 figures.

O`Rourke, P.E.; Livingston, R.R.

1995-03-28T23:59:59.000Z

131

Stabilized dual-wavelength fiber-optic interferometer for vibration measurement  

Science Journals Connector (OSTI)

A stabilized fiber-optic interferometer was developed for vibration measurement by using two laser diodes of different wavelengths and one polarization-maintaining fiber. Passive...

Wright, O B

1991-01-01T23:59:59.000Z

132

Spatially Multiplexed Fiber-optic Microscopy for Simultaneous Imaging of Multiple Brain Regions  

Science Journals Connector (OSTI)

Spatially multiplexed fiber-optic imager is experimentally demonstrated. Our system utilizes a trifurcated fiber bundles for real-time brain imaging in 3 different areas.

Cha, Jaepyeong; Kang, Jin U

133

E-Print Network 3.0 - absolute fiber optic Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Index Terms--Characterization, fiber-arrays, optical fiber, op- tical waveguides, optoelectronic... large numbers of input and output channels that require precisely aligned ......

134

Polypropylene/Glass Fiber Hierarchical Composites Incorporating Inorganic Fullerene-like Nanoparticles for Advanced Technological Applications  

Science Journals Connector (OSTI)

In particular, the incorporation of nanoclays to GFRPs has been reported to improve significantly the heat distortion temperature, flexural and impact strengths. ... Enhanced mech., thermal and vibration properties were obsd. in nanoclay dispersed composites over vinyl ester-glass fiber composite. ...

Ana M. Díez-Pascual; Mohammed Naffakh

2013-09-09T23:59:59.000Z

135

Behavior of Three-Dimensionally Woven Glass Fiber Reinforced Polymeric Bridge Deck  

E-Print Network [OSTI]

Abstract Behavior of Three-Dimensionally Woven Glass Fiber Reinforced Polymeric Bridge Deck Charles M. Johnson, NC State University MS Student Tarek S. Mohamed, NC State University MS Student Sami H polymer (GFRP) bridge decks have been considered os an alternative to conventional steel and concrete

136

Transient Rheology of a Polypropylene Melt Reinforced with Long Glass Fibers Ortman, K.C.1  

E-Print Network [OSTI]

of producing high strength materials used in energy demanding structures such as automobiles, buildings In an effort to produce lightweight energy efficient parts with high moduli, thermoplastics are reinforced glass fibers in polymeric melts5,7 , however #12;relatively few efforts have produced applicable models

Wapperom, Peter

137

Low-cost fiber-optic chemochromic hydrogen detector  

SciTech Connect (OSTI)

The ability to detect hydrogen gas leaks economically and with inherent safety is an important technology that could facilitate commercial acceptance of hydrogen fuel in various applications. In particular, hydrogen fueled passenger vehicles will require hydrogen leak detectors to signal the activation of safety devices such as shutoff valves, ventilating fans, alarms, etc. Such detectors may be required in several locations within a vehicle--wherever a leak could pose a safety hazard. It is therefore important that the detectors be very economical. This paper reports progress on the development of low-cost fiber-optic hydrogen detectors intended to meet the needs of a hydrogen-fueled passenger vehicle. In the design, the presence of hydrogen in air is sensed by a thin-film coating at the end of a polymer optical fiber. When the coating reacts reversibly with the hydrogen, its optical properties are changed. Light from a central electro-optic control unit is projected down the optical fiber where it is reflected from the sensor coating back to central optical detectors. A change in the reflected intensity indicates the presence of hydrogen. The fiber-optic detector offers inherent safety by removing all electrical power from the leak sites and offers reduced signal processing problems by minimizing electromagnetic interference. Critical detector performance requirements include high selectivity, response speed and durability as well as potential for low-cost production.

Benson, D.K.; Tracy, C.E.; Hishmeh, G.; Ciszek, P.; Lee, S.H. [National Renewable Energy Lab., Golden, CO (United States)

1998-08-01T23:59:59.000Z

138

Third order nonlinear optical properties of bismuth zinc borate glasses  

SciTech Connect (OSTI)

Third order nonlinear optical characterization of bismuth zinc borate glasses are reported here using different laser pulse durations. Bismuth zinc borate glasses with compositions xBi{sub 2}O{sub 3}-30ZnO-(70-x) B{sub 2}O{sub 3} (where x?=?30, 35, 40, and 45?mol. %) have been prepared by melt quenching method. These glasses were characterized by Raman, UV-Vis absorption, and Z scan measurements. Raman and UV-Vis spectroscopic results indicate that non-bridging oxygens increase with increase of bismuth content in the glass. Nonlinear absorption and refraction behavior in the nanosecond (ns), picosecond (ps), and femtosecond (fs) time domains were studied in detail. Strong reverse saturable absorption due to dominant two-photon absorption (TPA) was observed with both ps and fs excitations. In the case of ns pulse excitations, TPA and free-carrier absorption processes contribute for the nonlinear absorption. Two-photon absorption coefficient (?) and the absorption cross section due to free carriers (?{sub e}) are estimated by theoretical fit of the open aperture Z-scan measurements and found to be dependent on the amount of bismuth oxide in the glass composition. In both ns and fs regimes the sign and magnitude of the third order nonlinearity are evaluated, and the optical limiting characteristics are also reported.

Shanmugavelu, B.; Ravi Kanth Kumar, V. V., E-mail: ravi.phy@pondiuni.edu.in [Department of Physics, Pondicherry University, Puducherry 605 014 (India); Kuladeep, R.; Narayana Rao, D. [School of Physics, University of Hyderabad, Hyderabad 500046, Andhra Pradesh (India)

2013-12-28T23:59:59.000Z

139

Compensation for the self-steepening effects in optical fiber communication system using midway optical phase conjugation  

Science Journals Connector (OSTI)

Effects of self-steepening (SS) of chirped Gaussian pulses on optical fiber communication system using midway optical phase conjugation (OPC) are analyzed. Dynamic evolution of the...

Bu, Yang; Wang, Xiangzhao

2004-01-01T23:59:59.000Z

140

Fiber-optic Fabry-Perot ultrasound sensor  

E-Print Network [OSTI]

of a novel type of ultrasound fiber-optic sensor was studied theoretically and experimentally. The sensor consists of a continuous length of single mode optical fiber into which two dielectric internal mirrors have been built to form a Fabry...-Perot Interferometer A Fabry-Perot interferometer consists of two parallel partially reflecting mirrors separated by a distance L generally much longer than the wavelength X of the light (see fig. 1) . If a light wave with amplitude A~ and coherence length several...

Alcoz, Jorge Jose

2012-06-07T23:59:59.000Z

Note: This page contains sample records for the topic "optical glass fibers" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Optical fiber networks boost utilities` power to thrive  

SciTech Connect (OSTI)

Recent legislative and regulatory initiatives have propelled the electric power industry onto the information superhighway. Utility companies are not only becoming large users of the information superhighway, but they also are building the physical network to carry the traffic. Some utilities are implementing fiber-optic projects that match or even exceed the size, scope and capabilities of networks installed by telecommunications firms and cable-television companies. Current optical-fiber deployments range from hundreds or thousands of route miles planned or installed by large utilities-such as Entergy and The Southern Company-to networks of just a few route miles envisioned by many smaller municipalities.

McDonald, M.; Boxer, M.

1997-07-01T23:59:59.000Z

142

Fiber optic sensors for environmental applications: A brief review  

SciTech Connect (OSTI)

Understanding the flow a groundwater quality. This understanding is achieved by measurement of the appropriate chemical and physical subsurface parameters. The ideal measurement would accurately assess a parameter without affecting the parameter or its environment. Fiber optic spectroscopy offers some of the most promising techniques for accurate, non-invasive measurements of environmental parameters. Fiber optic sensors for subsurface applications are currently being developed by several Department of Energy laboratories. Some of these sensors have been successfully deployed in the field and are attaining the goals of accurate, noninvasive, real time measurements in the subsurface.

Rossabi, J.

1992-04-01T23:59:59.000Z

143

Ship Effect Measurements With Fiber Optic Neutron Detector  

SciTech Connect (OSTI)

The main objectives of this research project was to assemble, operate, test and characterize an innovatively designed scintillating fiber optic neutron radiation detector manufactured by Innovative American Technology with possible application to the Department of Homeland Security screening for potential radiological and nuclear threats at US borders (Kouzes 2004). One goal of this project was to make measurements of the neutron ship effect for several materials. The Virginia State University DOE FaST/NSF summer student-faculty team made measurements with the fiber optic radiation detector at PNNL above ground to characterize the ship effect from cosmic neutrons, and underground to characterize the muon contribution.

King, Kenneth L.; Dean, Rashe A.; Akbar, Shahzad; Kouzes, Richard T.; Woodring, Mitchell L.

2010-08-10T23:59:59.000Z

144

Quantum vacuum radiation in optical glass  

E-Print Network [OSTI]

A recent experimental claim of the detection of analogue Hawking radiation in an optical system [PRL 105 (2010) 203901] has led to some controversy [PRL 107 (2011) 149401, 149402]. While this experiment strongly suggests some form of particle creation from the quantum vacuum (and hence it is per se very interesting), it is also true that it seems difficult to completely explain all features of the observations by adopting the perspective of a Hawking-like mechanism for the radiation. For instance, the observed photons are emitted parallel to the optical horizon, and the relevant optical horizon is itself defined in an unusual manner by combining group and phase velocities. This raises the question: Is this really Hawking radiation, or some other form of quantum vacuum radiation? Naive estimates of the amount of quantum vacuum radiation generated due to the rapidly changing refractive index --- sometimes called the dynamical Casimir effect --- are not encouraging. However we feel that naive estimates could be misleading depending on the quantitative magnitude of two specific physical effects: "pulse steepening" and "pulse cresting". Plausible bounds on the maximum size of these two effects results in estimates much closer to the experimental observations, and we argue that the dynamical Casimir effect is now worth additional investigation.

Stefano Liberati; Angus Prain; Matt Visser

2011-11-01T23:59:59.000Z

145

Amendment to LM-07-12 for Fiber Optic Cable Trenching at the...  

Broader source: Energy.gov (indexed) [DOE]

Amendment to LM-07-12 for Fiber Optic Cable Trenching at the Westminster, Colorado, Office Amendment to LM-07-12 for Fiber Optic Cable Trenching at the Westminster, Colorado,...

146

An optical fiber Faraday effect current sensor for power system applications  

E-Print Network [OSTI]

Optical fiber sensors have many inherent properties which make them ideal for applications within electric power systems. The dielectric isolation achieved in using optical fiber has fostered research in the areas of communication and sensing...

Short, Shayne Xavier

1995-01-01T23:59:59.000Z

147

Measurement of distributed strain due to laying and recovery of submarine optical fiber cable  

Science Journals Connector (OSTI)

Strain distribution due to cable laying and recovery is measured, using Brillouin optical fiber time domain analysis in a 3.7-km long submarine optical fiber cable. We believe this is...

Kurashima, Toshio; Horiguchi, Tsuneo; Yoshizawa, Nobuyuki; Tada, Hidenobu; Tateda, Mitsuhiro

1991-01-01T23:59:59.000Z

148

Multiparameter Fiber Optic Sensing System for Monitoring Enhanced  

Open Energy Info (EERE)

Multiparameter Fiber Optic Sensing System for Monitoring Enhanced Multiparameter Fiber Optic Sensing System for Monitoring Enhanced Geothermal Systems Geothermal Project Jump to: navigation, search Last modified on July 22, 2011. Project Title Multiparameter Fiber Optic Sensing System for Monitoring Enhanced Geothermal Systems Project Type / Topic 1 Recovery Act: Enhanced Geothermal Systems Component Research and Development/Analysis Project Type / Topic 2 High-Temperature Downhole Tools Project Description The multidisciplinary team, consisting of participants from GE, Qorex LLC, AFL Telecommunications and Sandia National Labs, has a strong record of successful harsh environment sensor technology development and will design and validate the reliability of a suite of distributed temperature, strain, vibration and precision point pressure fiber-based sensors. During the first year, the program will demonstrate fiber and sensor subsystem reliability in the presence of hydrogen at 374°C and 220 bar, which is critical to acceptance of this technology in EGS. Based on these results, a go/no-go decision will be made to complete any remaining development and proceed to prototype a high temperature cable which integrates these subsystems onto a single tool string to facilitate field deployment.

149

Optimized Tapered Optical Fiber for Ethanol (C $_{\\bf 2}$ H $_{\\bf 5}$ OH) Concentration Sensing  

Science Journals Connector (OSTI)

An optimized study of biconical tapered multi-mode plastic optical fiber sensor for concentration sensing of ethanol (C $_{2}$ ...

Yang, Hang-Zhou; Qiao, Xue-Guang; Ali, M Mahmood; Islam, Md Rajibul; Lim, Kok-Sing

2014-01-01T23:59:59.000Z

150

Circulating Optical Particle Trapping through the Integration of Fiber Optics and Microfluidics  

Science Journals Connector (OSTI)

A dual-fiber optic trap is integrated with microfluidics, and stable circulatory particle trapping is observed. The unique circulating and flow-dependant nature of the trap enables...

Blakely, J Thomas; Gordon, Reuven; Sinton, David

151

Fiber optic signal amplifier using thermoelectric power generation  

DOE Patents [OSTI]

A remote fiber optic signal amplifier for use as a repeater/amplifier, such as in transoceanic communications, powered by a Pu{sub 238} or Sr{sub 90} thermoelectric generator. The amplifier comprises a unit with connections on the receiving and sending sides of the communications system, and an erbium-doped fiber amplifier connecting each sending fiber to each receiving fiber. The thermoelectric generator, preferably a Pu{sub 238} or Sr{sub 90} thermoelectric generator delivers power to the amplifiers through a regulator. The heat exchange surfaces of the thermoelectric generator are made of materials resistant to corrosion and biological growth and are directly exposed to the outside, such as the ocean water in transoceanic communications. 2 figs.

Hart, M.M.

1995-04-18T23:59:59.000Z

152

Fiber optic signal amplifier using thermoelectric power generation  

DOE Patents [OSTI]

A remote fiber optic signal amplifier for use as a repeater/amplifier, such as in transoceanic communications, powered by a Pu.sub.238 or Sr.sub.90 thermoelectric generator. The amplifier comprises a unit with connections on the receiving and sending sides of the communications system, and an erbium-doped fiber amplifier connecting each sending fiber to each receiving fiber. The thermoelectric generator, preferably a Pu.sub.238 or Sr.sub.90 thermoelectric generator delivers power to the amplifiers through a regulator. The heat exchange surfaces of the thermoelectric generator are made of materials resistant to corrosion and biological growth and are directly exposed to the outside, such as the ocean water in transoceanic communications.

Hart, Mark M. (Aiken, SC)

1995-01-01T23:59:59.000Z

153

All-fiber optical parametric amplifier for life-science application  

Science Journals Connector (OSTI)

We demonstrate an all-fiber optical parametric amplifier for life-science (OPALS) application. Optical amplification of megahertz serial time-encoded amplified microscopy (STEAM)...

Wei, Xiaoming; Lau, Andy; Xu, Yiqing; Zhang, Chi; Mussot, Arnaud; Kudlinski, Alexandre; Tsia, Kevin; Wong, Kenneth

154

Compact multiwavelength transmitter module for multimode fiber optic ribbon cable  

DOE Patents [OSTI]

A compact multiwavelength transmitter module for multimode fiber optic ribbon cable, which couples light from an M.times.N array of emitters onto N fibers, where the M wavelength may be distributed across two or more vertical-cavity surface-emitting laser (VCSEL) chips, and combining emitters and multiplexer into a compact package that is compatible with placement on a printed circuit board. A key feature is bringing together two emitter arrays fabricated on different substrates--each array designed for a different wavelength--into close physical proximity. Another key feature is to compactly and efficiently combine the light from two or more clusters of optical emitters, each in a different wavelength band, into a fiber ribbon.

Deri, Robert J. (Pleasanton, CA); Pocha, Michael D. (Livermore, CA); Larson, Michael C. (Goleta, CA); Garrett, Henry E. (Livermore, CA)

2002-01-01T23:59:59.000Z

155

Expanded beam non-imaging fiber optic connector  

DOE Patents [OSTI]

There is disclosed an expanded beam fiber to fiber connector, based on non-imaging optic principles for coupling light beams from one optical fiber to another. The system consists of two identical connector parts, referred to herein as a collimating part and a concentrating part, each having a preferred partially curved reflective boundary surface for minimizing power loss and surrounding either a hollow space or a space filled with a uniform transparent medium. In one embodiment the boundary is metallic while in a second embodiment the boundary is in the form of an interface allowing total internal reflection. In both the hollow and filled case a lens may be located at the expanded end of both the collimator part and the concentrator part forming the connector. The connector is preferably located in a housing in order to protect and preserve the mechanical stability of the coupler. 13 figs.

Jannson, T.; Jannson, J.; Yeung, P.

1990-02-06T23:59:59.000Z

156

Publish date: 06/27/2011 ECE 4360: Fiber Optic Systems  

E-Print Network [OSTI]

Publish date: 06/27/2011 ECE 4360: Fiber Optic Systems Credit / Contact hours: 3 / 3 Course coordinator: Zhaoyang Fan Textbook(s) and/or other required material: Keiser, Optical Fiber Communications, McGraw Hill, 2000. Catalog description: Optical fibers, couplers, sources, and detectors; applications

Gelfond, Michael

157

Seismic-frequency attenuation and moduli estimates using a fiber-optic strainmeter Ludmila Adam 1  

E-Print Network [OSTI]

Seismic-frequency attenuation and moduli estimates using a fiber-optic strainmeter Ludmila Adam 1 Summary We have developed a fiber-optic strainmeter to estimate velocities and attenuation at seismic only part of the core sample, the fiber-optic strainmeter would analyze the rock sample response

158

The Fiber Optic Multiplexed Upgraded Thomson Scattering Diagnostic for the ISTTOK Tokamak  

E-Print Network [OSTI]

The Fiber Optic Multiplexed Upgraded Thomson Scattering Diagnostic for the ISTTOK Tokamak M. P by different length optical fibers used to relay the scattered light to a single spectrometer. 2. Thomson vessel and opposite to the collection lenses. Figure 1 shows the present two fiber optic Thomson

159

Fiber Optic Temperature Sensor for PEM Fuel Cells  

E-Print Network [OSTI]

Fiber Optic Temperature Sensor for PEM Fuel Cells S.W. Allison, T.J. McIntyre, L.C. Maxey, M Objectives · Develop a low cost, robust temperature sensor for monitoring fuel cell condition and performance Hydrogren and Fuel Cells Merit Review Meeting May 19-22, 2003, Berkeley, California #12;Program Goals

160

Universal fiber-optic C.I.E. colorimeter  

DOE Patents [OSTI]

Apparatus for color measurements according to the C.I.E. system comprises a first fiber optic cable for receiving and linearizing light from a light source, a lens system for spectrally displaying the linearized light and focusing the light on one end of a trifurcated fiber optic assembly that integrates and separates the light according to the three C.I.E. tristimulus functions. The separated light is received by three photodiodes and electronically evaluated to determine the magnitude of the light corresponding to the tristimulus functions. The fiber optic assembly is made by forming, at one end, a bundle of optic fibers to match the contours of one of the tristimulus functions, encapsulating that bundle, adding a second bundle that, together with the first bundle, will match the contours of the first plus one other tristimulus function, encapsulating that second bundle, then adding a third bundle which together with the first and second bundles, has contours matching the sum of all three tristimulus functions. At the other end of the assembly the three bundles are separated and aligned with their respective photodiodes.

Kronberg, James W. (353 Church Rd., Beech Island, SC 29841)

1992-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "optical glass fibers" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

Optical fiducial timing system for X-ray streak cameras with aluminum coated optical fiber ends  

DOE Patents [OSTI]

An optical fiducial timing system is provided for use with interdependent groups of X-ray streak cameras (18). The aluminum coated (80) ends of optical fibers (78) are positioned with the photocathodes (20, 60, 70) of the X-ray streak cameras (18). The other ends of the optical fibers (78) are placed together in a bundled array (90). A fiducial optical signal (96), that is comprised of 2.omega. or 1.omega. laser light, after introduction to the bundled array (90), travels to the aluminum coated (82) optical fiber ends and ejects quantities of electrons (84) that are recorded on the data recording media (52) of the X-ray streak cameras (18). Since both 2.omega. and 1.omega. laser light can travel long distances in optical fiber with only a slight attenuation, the initial arial power density of the fiducial optical signal (96) is well below the damage threshold of the fused silica or other material that comprises the optical fibers (78, 90). Thus the fiducial timing system can be repeatably used over long durations of time.

Nilson, David G. (Oakland, CA); Campbell, E. Michael (Pleasanton, CA); MacGowan, Brian J. (Livermore, CA); Medecki, Hector (Livermore, CA)

1988-01-01T23:59:59.000Z

162

OPTICAL FIBER SENSOR TECHNOLOGIES FOR EFFICIENT AND ECONOMICAL OIL RECOVERY  

SciTech Connect (OSTI)

Efficient recovery of petroleum reserves from existing oil wells has been proven to be difficult due to the lack of robust instrumentation that can accurately and reliably monitor processes in the downhole environment. Commercially available sensors for measurement of pressure, temperature, and fluid flow exhibit shortened lifetimes in the harsh downhole conditions, which are characterized by high pressures (up to 20 kpsi), temperatures up to 250 C, and exposure to chemically reactive fluids. Development of robust sensors that deliver continuous, real-time data on reservoir performance and petroleum flow pathways will facilitate application of advanced recovery technologies, including horizontal and multilateral wells. This is the final report for the four-year program ''Optical Fiber Sensor Technologies for Efficient and Economical Oil Recovery'', funded by the National Petroleum Technology Office of the U.S. Department of Energy, and performed by the Center for Photonics Technology of the Bradley Department of Electrical and Computer Engineering at Virginia Tech from October 1, 1999 to March 31, 2003. The main objective of this research program was to develop cost-effective, reliable optical fiber sensor instrumentation for real-time monitoring of various key parameters crucial to efficient and economical oil production. During the program, optical fiber sensors were demonstrated for the measurement of temperature, pressure, flow, and acoustic waves, including three successful field tests in the Chevron/Texaco oil fields in Coalinga, California, and at the world-class oil flow simulation facilities in Tulsa, Oklahoma. Research efforts included the design and fabrication of sensor probes, development of signal processing algorithms, construction of test systems, development and testing of strategies for the protection of optical fibers and sensors in the downhole environment, development of remote monitoring capabilities allowing real-time monitoring of the field test data from virtually anywhere in the world, and development of novel data processing techniques. Comprehensive testing was performed to systematically evaluate the performance of the fiber optic sensor systems in both lab and field environments.

Anbo Wang; Kristie L. Cooper; Gary R. Pickrell

2003-06-01T23:59:59.000Z

163

Development of New Generation of Thermally-Enhanced Fiber Glass Insulation  

SciTech Connect (OSTI)

This report presents experimental and numerical results from thermal performance studies. The purpose of this Cooperative Research and Development Agreement (CRADA) between UT-Battelle, LLC and John s Manville was to design a basic concept of a new generation of thermally-enhanced fiber glass insulation. Different types of Phase Change Materials (PCMs) have been tested as dynamic components in buildings during the last 4 decades. Most historical studies have found that PCMs enhance building energy performance. Some PCM-enhanced building materials, like PCM-gypsum boards or PCM-impregnated concretes have already found their limited applications in different countries. Today, continued improvements in building envelope technologies suggest that throughout Southern and Central U.S. climates, residences may soon be routinely constructed with PCM in order to maximize insulation effectiveness and maintain low heating and cooling loads. The proposed thermally-enhanced fiber glass insulation will maximize this integration by utilizing a highly-efficient building envelope with high-R thermal insulation, active thermal mass and superior air-tightness. Improved thermal resistance will come from modifications in infrared internal characteristics of the fiber glass insulation. Thermal mass effect can be provided by proprietary thermally-active microencapsulated phase change material (PCM). Work carried out at the Oak Ridge National Laboratory (ORNL) on the CRADA is described in this report.

Kosny, Jan [ORNL; Yarbrough, David W [ORNL; Childs, Phillip W [ORNL; Miller, William A [ORNL; Atchley, Jerald Allen [ORNL; Shrestha, Som S [ORNL

2010-03-01T23:59:59.000Z

164

Ferric oxide quantum dots in stable phosphate glass system and their magneto-optical study  

SciTech Connect (OSTI)

Graphical abstract: We report synthesis of ferric oxide embedded low melting phosphate glass nanocomposite and also the effect of ferric oxide nanoparticles (NCs) content on the optical and magneto-optical properties of the glasses. Faraday rotation of the glass nanocomposites was measured and showed variation in Verdet constant with concentration of ferric oxide. Interestingly, the host glass itself showed fairly good Verdet constant (11.5°/T cm) and there is a threefold enhancement in the Verdet constant of ferric oxide quantum dot-glass nanocomposite. Highlights: ? We synthesize ferric oxide embedded low melting stable phosphate glass nanocomposite. ? Glasses doped with 0.25 and 2% ferric oxide show particle size in the range of 4–12 nm. ? The host phosphate glass itself shows fairly good Verdet constant (11.5°/T cm). ? Glasses doped with 0.25% ferric oxide show high Verdet constant (30.525°/T cm). ? The as synthesis glasses may have potential application in magneto optical devices. -- Abstract: Herein, we report the synthesis of ferric oxide embedded low melting phosphate glass nanocomposite and also the effect of ferric oxide nanoparticles content on the optical and magneto-optical properties of the glasses. The optical study clearly showed red shift in optical cut off with increasing ferric oxide concentration. The band gap of the host glass was observed to be 3.48 eV and it shifted to 3.14 eV after doping with ferric oxide. The glasses doped with 0.25 and 2% ferric oxide showed particle size of 4–6 nm and 8–12 nm, respectively. Faraday rotation of the glass nanocomposites was measured and showed variation in the Verdet constant as per increasing concentration of ferric oxide. Interestingly, the host glass itself showed fairly good Verdet constant (11.5°/T cm) and threefold enhancement was observed in the Verdet constant of ferric oxide quantum dot-glass nanocomposite.

Garaje, Sunil N.; Apte, Sanjay K. [Nanocomposite Group, Centre for Materials for Electronics Technology (C-MET), Department of Electronics and Information Technology (DeitY), Government of India, Panchawati, Off Pashan Road, Pune 411008 (India)] [Nanocomposite Group, Centre for Materials for Electronics Technology (C-MET), Department of Electronics and Information Technology (DeitY), Government of India, Panchawati, Off Pashan Road, Pune 411008 (India); Kumar, Ganpathy [Department of Electrical and Computer Engineering, Tennessee Technological University, 1 William L. Jones Drive, Cookeville, TN 38505 (United States)] [Department of Electrical and Computer Engineering, Tennessee Technological University, 1 William L. Jones Drive, Cookeville, TN 38505 (United States); Panmand, Rajendra P.; Naik, Sonali D. [Nanocomposite Group, Centre for Materials for Electronics Technology (C-MET), Department of Electronics and Information Technology (DeitY), Government of India, Panchawati, Off Pashan Road, Pune 411008 (India)] [Nanocomposite Group, Centre for Materials for Electronics Technology (C-MET), Department of Electronics and Information Technology (DeitY), Government of India, Panchawati, Off Pashan Road, Pune 411008 (India); Mahajan, Satish M., E-mail: smahajan@tntech.edu [Department of Electrical and Computer Engineering, Tennessee Technological University, 1 William L. Jones Drive, Cookeville, TN 38505 (United States); Chand, Ramesh [Ministry of Communications and Information Technology, Department of Electronics and Information Technology (DeitY), Electronics Niketan, 6, CGO Complex, New Delhi 110003 (India)] [Ministry of Communications and Information Technology, Department of Electronics and Information Technology (DeitY), Electronics Niketan, 6, CGO Complex, New Delhi 110003 (India); Kale, Bharat B., E-mail: bbkale@cmet.gov.in [Nanocomposite Group, Centre for Materials for Electronics Technology (C-MET), Department of Electronics and Information Technology (DeitY), Government of India, Panchawati, Off Pashan Road, Pune 411008 (India)

2013-02-15T23:59:59.000Z

165

Simultaneous Cancellation of Fiber Loss, Dispersion, and Kerr Effect in Ultralong-Haul Optical Fiber Transmission by Midway Optical Phase Conjugation Incorporated With Distributed Raman Amplification  

Science Journals Connector (OSTI)

An alternative application of distributed Raman amplification (DRA) for ultralong-haul optical fiber transmission is proposed. In our study, the DRA is employed in a transmission...

Kaewplung, Pasu; Kikuchi, Kazuro

2007-01-01T23:59:59.000Z

166

Wavelength meter having single mode fiber optics multiplexed inputs  

DOE Patents [OSTI]

A wavelength meter having a single mode fiber optics input is disclosed. The single mode fiber enables a plurality of laser beams to be multiplexed to form a multiplexed input to the wavelength meter. The wavelength meter can provide a determination of the wavelength of any one or all of the plurality of laser beams by suitable processing. Another aspect of the present invention is that one of the laser beams could be a known reference laser having a predetermined wavelength. Hence, the improved wavelength meter can provide an on-line calibration capability with the reference laser input as one of the plurality of laser beams.

Hackel, R.P.; Paris, R.D.; Feldman, M.

1993-02-23T23:59:59.000Z

167

Wavelength meter having single mode fiber optics multiplexed inputs  

DOE Patents [OSTI]

A wavelength meter having a single mode fiber optics input is disclosed. The single mode fiber enables a plurality of laser beams to be multiplexed to form a multiplexed input to the wavelength meter. The wavelength meter can provide a determination of the wavelength of any one or all of the plurality of laser beams by suitable processing. Another aspect of the present invention is that one of the laser beams could be a known reference laser having a predetermined wavelength. Hence, the improved wavelength meter can provide an on-line calibration capability with the reference laser input as one of the plurality of laser beams.

Hackel, Richard P. (Livermore, CA); Paris, Robert D. (San Ramon, CA); Feldman, Mark (Pleasanton, CA)

1993-01-01T23:59:59.000Z

168

Fiber optic thermal/fast neutron and gamma ray scintillation detector  

DOE Patents [OSTI]

A system for detecting fissile and fissionable material originating external to the system includes: a .sup.6Li loaded glass fiber scintillator for detecting thermal neutrons, x-rays and gamma rays; a fast scintillator for detecting fast neutrons, x-rays and gamma rays, the fast scintillator conjoined with the glass fiber scintillator such that the fast scintillator moderates fast neutrons prior to their detection as thermal neutrons by the glass fiber scintillator; and a coincidence detection system for processing the time distributions of arriving signals from the scintillators.

Neal, John S. (Knoxville, TN); Mihalczo, John T (Oak Ridge, TN)

2007-10-30T23:59:59.000Z

169

Demonstrating LED and Fiber Optic Lighting in Commissary Applications  

Broader source: Energy.gov (indexed) [DOE]

Demonstrating LED and Fiber Optic Demonstrating LED and Fiber Optic Lighting in Commissary Applications Joseph Konrade Energy Technology Program Specialist Federal Energy Management Program 2 GOAL OF THE PROJECT * Promote New Lighting Technology * Document Energy Savings * Duplicate the technology * Expand Alternative Financing Opportunities * Include Lighting Technology in Government Projects within Utility Service Territory 3 History * FEMP sponsored E4 audits * Audit designed to review Utility Cost, Operations and Maintenance, New Technology Application * 3 Defense Commissary Agency (DeCA) received services under the agreement with DOE * Fort George G Meade pays a high electricity rate Electricity cost $0.171/kWh (PWC sub-metered rate) * Commissary was previously unmetered - Meter installed during installation of lighting project. New meter showing higher

170

Understanding High-Power Fiber-Optic Laser Beam Delivery  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

High-Power Fiber-Optic Laser Beam Delivery High-Power Fiber-Optic Laser Beam Delivery The submitted manuscript has been authored by a contractor of the U.S. Government under contract No. W- 31-109-ENG-38. Accordingly, the U.S. Government retains a nonexclusive, royalty-free license to publish or reproduce the published form of this contribution, or allow others to do so, for U.S. Government purposes. Boyd V. Hunter and Keng H. Leong Argonne National Laboratory Technology Development Division Laser Applications Laboratory 9700 South Cass Avenue, Building 207 Argonne, Illinois 60439 Carl B. Miller, James F. Golden, Robert D. Glesias and Patrick J. Laverty U. S. Laser Corporation 825 Windham Court North P. O. Box 609 Wyckoff, New Jersey 07481 March 25, 1996 Manuscript to be submitted to Journal of Laser Applications

171

Optical Fiber Sensor Technologies for Efficient and Economical Oil Recovery  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Optical Fiber Sensor Technologies for Optical Fiber Sensor Technologies for Efficient and Economical Oil Recovery Final Technical Report Reporting Period Start Date: 1 October 1998 Reporting Period End Date: 31 March 2003 Principal Investigator: Anbo Wang Principal Report Authors: Kristie L. Cooper, Gary R. Pickrell, Anbo Wang Report Issued: June 2003 DOE Award Number: DE-FT26-98BC15167 Submitted by: Center for Photonics Technology Bradley Department of Electrical and Computer Engineering Virginia Polytechnic Institute & State University Blacksburg, VA 24061-0111 ii Disclaimer: This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or

172

Optical fiber technique as a tool to improve combustion efficiency  

SciTech Connect (OSTI)

A multi-optical fiber technique is presented, which enables one to detect the flame propagation during non-knocking and knocking conditions in real production engines. The measurement technique is appropriate to detect knock onset locations and to describe the propagation of knocking reaction fronts. With this knowledge, the combustion chamber shape can be optimized, leading to a better knock resistance and higher combustion efficiencies. Results of flame propagation under non-knocking and knocking engine operating conditions are presented. In addition, correlations between knock onset locations and areas in which knock damage occurs are shown for different engines. Presented are the effects of combustion chamber modifications on the combustion efficiency, based on the analysis of the optical fiber measurements.

Spicher, U.; Krebs, R.

1990-01-01T23:59:59.000Z

173

Medical catheters thermally manipulated by fiber optic bundles  

DOE Patents [OSTI]

A maneuverable medical catheter comprising a flexible tube having a functional tip. The catheter is connected to a control source. The functional tip of the catheter carries a plurality of temperature activated elements arranged in parallel and disposed about the functional tip and held in spaced relation at each end. These elements expand when they are heated. A plurality of fiber optic bundles, each bundle having a proximal end attached to the control source and a distal end attached to one of the elements carry light into the elements where the light is absorbed as heat. By varying the optic fiber that is carrying the light and the intensity of the light, the bending of the elements can be controlled and thus the catheter steered. In an alternate embodiment, the catheter carries a medical instrument for gathering a sample of tissue. The instrument may also be deployed and operated by thermal expansion and contraction of its moving parts.

Chastagner, Philippe (608 Aumond Rd., Augusta, GA 30909)

1992-01-01T23:59:59.000Z

174

Plug repairs of marine glass fiber / vinyl ester laminates subjected to in-plane shear stress or in-plane bending moment  

E-Print Network [OSTI]

Glass fiber / vinyl ester composite laminates represent an important class of modem fiber composites being proposed or used in state-of-the-art shipbuilding. This thesis examined the effectiveness of chopped strand mat ...

Urrutia Valenzuela, Roberto

2010-01-01T23:59:59.000Z

175

Mechanical behavior of silica optical fibers coated with low index, low surface energy perfluorinated polymer  

E-Print Network [OSTI]

based on perfluorinated polymer were prepared for use as UV-curable optical cladding for silica fibers fibers, with a core doped with rare earth elements, could potentially be used as laser fibers but require special optical cladding. This cladding should have a low refractive index, low modulus of elasticity

Matthewson, M. John

176

Tapered optical fibers as tools for probing magneto-optical trap characteristics  

SciTech Connect (OSTI)

We present a novel technique for measuring the characteristics of a magneto-optical trap (MOT) for cold atoms by monitoring the spontaneous emission from trapped atoms coupled into the guided mode of a tapered optical nanofiber. We show that the nanofiber is highly sensitive to very small numbers of atoms close to its surface. The size and shape of the MOT, determined by translating the cold atom cloud across the tapered fiber, is in excellent agreement with measurements obtained using the conventional method of fluorescence imaging using a charge coupled device camera. The coupling of atomic fluorescence into the tapered fiber also allows us to monitor the loading and lifetime of the trap. The results are compared to those achieved by focusing the MOT fluorescence onto a photodiode and it was seen that the tapered fiber gives slightly longer loading and lifetime measurements due to the sensitivity of the fiber, even when very few atoms are present.

Morrissey, Michael J.; Deasy, Kieran [Department of Applied Physics and Instrumentation, Cork Institute of Technology, Cork (Ireland); Photonics Centre, Tyndall National Institute, University College Cork, Prospect Row, Cork (Ireland); Wu Yuqiang; Nic Chormaic, Sile [Photonics Centre, Tyndall National Institute, University College Cork, Prospect Row, Cork (Ireland); Department of Physics, University College Cork, Cork (Ireland); Chakrabarti, Shrabana [Photonics Centre, Tyndall National Institute, University College Cork, Prospect Row, Cork (Ireland)

2009-05-15T23:59:59.000Z

177

Telemetry with an Optical Fiber Revisited: An Alternative Strategy  

Science Journals Connector (OSTI)

With a new data-acquisition system developed by PASCO scientific an experiment on telemetry with an optical fiber 1 2 can be made easier and more accurate. For this aim an alternative strategy of the remote temperature measurements is proposed: the frequency of light pulses transmitted via the light guide numerically equals the temperature using known manufacturer's data or an initial calibration step. The additional equipment for the experiment is reduced to a minimum.

2014-01-01T23:59:59.000Z

178

Fiber-Optic Long-Line Position Sensor  

Energy Innovation Portal (Marketing Summaries) [EERE]

Sandia National Laboratories has developed a side-emitting fiber optic position sensor and method of determining an unknown position of an object by using the sensor.  Non-electrical position sensors like the one developed by Sandia are desirable for use in hazardous environment, e.g., for measuring the liquid level in gasoline or jet fuel tanks.  This sensor is an attractive option because it does not introduce electrical energy, is insensitive to electromagnetic interference,...

2013-03-12T23:59:59.000Z

179

Performance comparison of fiber optic tips in interferrometric displacement measurement  

SciTech Connect (OSTI)

Fiber optic displacement sensors have many potential advantages over traditional displacement measurement techniques, including small size, immunity to electromagnetic interference, electrical isolation, and high resolution. In this report, we focus on an interferometric fiber optic sensor, where the gap between the fiber tip and the device under test forms a Fabry-Perot resonant cavity. An optical interrogator measures the reflected intensity at wavelengths ranging from 1510 to 1590 nm. The spacing between resonant frequencies allows us to determine the distance from the tip to the device under test. We consider ferrule connector angled physical contact (FC/APC), ferrule connector ultra physical contact (FC/UPC) and unpolished cleaved tips and compare their influence on sensor performance. A plane wave propagation model is proposed for predicting tip effects. Comparisons are made on the basis of sensor measurement range, resolution, and sensitivity to changes in test conditions. In this paper, we discuss the experimental setup, detail our analysis, and present test results with recommendations for the applications of each tip.

Moro, Erik A [Los Alamos National Laboratory; Puckett, Anthony D [Los Alamos National Laboratory; Grahn, Rick [UNM; Karimi, Hussain [UCSD; Wilson, Kyle [ROSE HULMAN INSTITUTE OT TECH.

2010-10-21T23:59:59.000Z

180

Thin-film fiber optic hydrogen and temperature sensor system  

DOE Patents [OSTI]

The invention discloses a sensor probe device for monitoring of hydrogen gas concentrations and temperatures by the same sensor probe. The sensor probe is constructed using thin-film deposition methods for the placement of a multitude of layers of materials sensitive to hydrogen concentrations and temperature on the end of a light transparent lens located within the sensor probe. The end of the lens within the sensor probe contains a lens containing a layer of hydrogen permeable material which excludes other reactive gases, a layer of reflective metal material that forms a metal hydride upon absorbing hydrogen, and a layer of semi-conducting solid that is transparent above a temperature dependent minimum wavelength for temperature detection. The three layers of materials are located at the distal end of the lens located within the sensor probe. The lens focuses light generated by broad-band light generator and connected by fiber-optics to the sensor probe, onto a reflective metal material layer, which passes through the semi-conducting solid layer, onto two optical fibers located at the base of the sensor probe. The reflected light is transmitted over fiber optic cables to a spectrometer and system controller. The absence of electrical signals and electrical wires in the sensor probe provides for an elimination of the potential for spark sources when monitoring in hydrogen rich environments, and provides a sensor free from electrical interferences. 3 figs.

Nave, S.E.

1998-07-21T23:59:59.000Z

Note: This page contains sample records for the topic "optical glass fibers" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

Large-area fiber-optic chemical sensors  

SciTech Connect (OSTI)

Pacific Northwest Laboratory is developing a large-area chemical sensor that combines chemically selective coatings and optical spectroscopy to detect target compounds. The chemically selective material is incorporated into the cladding of an optical fiber waveguide. The material is interrogated using optical spectroscopic techniques to determine the concentration of target compounds. The optical interrogation method includes two spectroscopies: visible-near infrared absorption spectroscopy and Raman spectroscopy. This work develops the physical and mathematical models of such a sensor and provides a set of tools with which to make design predictions for the large-area chemical sensors. The theoretical relationships derived herein allow the use of bulk absorption parameters and bulk Raman coefficients to predict sensor performance.

Bliss, M.; Craig, R.A.

1995-05-01T23:59:59.000Z

182

High density array fabrication and readout method for a fiber optic biosensor  

DOE Patents [OSTI]

The invention relates to the fabrication and use of biosensors comprising a plurality of optical fibers each fiber having attached to its ``sensor end`` biological ``binding partners`` (molecules that specifically bind other molecules to form a binding complex such as antibody-antigen, lectin-carbohydrate, nucleic acid-nucleic acid, biotin-avidin, etc.). The biosensor preferably bears two or more different species of biological binding partner. The sensor is fabricated by providing a plurality of groups of optical fibers. Each group is treated as a batch to attach a different species of biological binding partner to the sensor ends of the fibers comprising that bundle. Each fiber, or group of fibers within a bundle, may be uniquely identified so that the fibers, or group of fibers, when later combined in an array of different fibers, can be discretely addressed. Fibers or groups of fibers are then selected and discretely separated from different bundles. The discretely separated fibers are then combined at their sensor ends to produce a high density sensor array of fibers capable of assaying simultaneously the binding of components of a test sample to the various binding partners on the different fibers of the sensor array. The transmission ends of the optical fibers are then discretely addressed to detectors--such as a multiplicity of optical sensors. An optical signal, produced by binding of the binding partner to its substrate to form a binding complex, is conducted through the optical fiber or group of fibers to a detector for each discrete test. By examining the addressed transmission ends of fibers, or groups of fibers, the addressed transmission ends can transmit unique patterns assisting in rapid sample identification by the sensor. 9 figs.

Pinkel, D.; Gray, J.

1997-11-25T23:59:59.000Z

183

Experimental stress–strain analysis of tapered silica optical fibers with nanofiber waist  

SciTech Connect (OSTI)

We experimentally determine tensile force–elongation diagrams of tapered optical fibers with a nanofiber waist. The tapered optical fibers are produced from standard silica optical fibers using a heat and pull process. Both, the force–elongation data and scanning electron microscope images of the rupture points indicate a brittle material. Despite the small waist radii of only a few hundred nanometers, our experimental data can be fully explained by a nonlinear stress–strain model that relies on material properties of macroscopic silica optical fibers. This is an important asset when it comes to designing miniaturized optical elements as one can rely on the well-founded material characteristics of standard optical fibers. Based on this understanding, we demonstrate a simple and non-destructive technique that allows us to determine the waist radius of the tapered optical fiber. We find excellent agreement with independent scanning electron microscope measurements of the waist radius.

Holleis, S.; Hoinkes, T.; Wuttke, C.; Schneeweiss, P.; Rauschenbeutel, A. [Vienna Center for Quantum Science and Technology, TU Wien—Atominstitut, Stadionallee 2, 1020 Vienna (Austria)

2014-04-21T23:59:59.000Z

184

Fiber-optic apparatus and method for measurement of luminescence and raman scattering  

DOE Patents [OSTI]

A dual fiber forward scattering optrode for Raman spectroscopy with the remote ends of the fibers in opposed, spaced relationship to each other to form a analyte sampling space therebetween and the method of measuring Raman spectra utilizing same. One optical fiber is for sending an exciting signal to the remote sampling space and, at its remote end, has a collimating microlens and an optical filter for filtering out background emissions generated in the fiber. The other optical fiber is for collecting the Raman scattering signal at the remote sampling space and, at its remote end, has a collimating microlens and an optical filter to prevent the exciting signal from the exciting fiber from entering the collection fiber and to thereby prevent the generation of background emissions in the collecting fiber.

Myrick, Michael L. (Livermore, CA); Angel, Stanley M. (Livermore, CA)

1993-01-01T23:59:59.000Z

185

Fiber Optic Evanescent Field Sensor for Hydrocarbon Monitoring in Air and Water applying UV Absorption  

Science Journals Connector (OSTI)

A fiber optic sensor for the monitoring of organic pollutants in air and water is presented. The UV absorption spectra of hydrocarbon soluble in special polymer fiber claddings are...

Schwotzer, G; Latka, I; Lehmann, H; Willsch, R

186

Compositional trends of ?-induced optical changes observed in chalcogenide glasses of binary As-S system  

SciTech Connect (OSTI)

Compositional trends of ?-induced optical changes in chalcogenide glasses are studied with the binary As-S system. Effects of ?-irradiation and annealing are compared using the changes measured in the fundamental optical absorption edge region. It is shown that annealing near the glass transition temperature leads to bleaching of As-S glasses, while ?-irradiation leads to darkening; both depend on the glass composition and thermal history of the specimens. These results are explained in terms of competitive destruction–polymerization transformations and physical aging occurring in As-S chalcogenide glasses under the influence of ?-irradiation.

Shpotyuk, M.; Shpotyuk, O.; Golovchak, Roman; McCloy, John S.; Riley, Brian J.

2014-01-23T23:59:59.000Z

187

Fiber glass reinforcement wrap gets DOT nod for gas-line use  

SciTech Connect (OSTI)

Panhandle Eastern Corp.'s Texas Eastern Transmission Corp. has become the first US natural-gas pipeline company to install, under federal waiver, a fiber glass reinforcement on an in-service gas pipeline. The Clock Spring repair system was installed in August on six segments of Texas Eastern's 20-in. gas pipeline in Fayette County, Ohio, after the company had received a US Department of Transportation (DOT) waiver to use the system in place of conventional DOT-mandated repair methods. The paper describes the conventional methods, as well as comparing costs of both methods.

Not Available

1993-12-13T23:59:59.000Z

188

Optical fiber configurations for transmission of laser energy over great distances  

DOE Patents [OSTI]

There are provided optical fiber configurations that provide for the delivery of laser energy, and in particular, the transmission and delivery of high power laser energy over great distances. These configurations further are hardened to protect the optical fibers from the stresses and conditions of an intended application. The configurations provide means for determining the additional fiber length (AFL) need to obtain the benefits of such additional fiber, while avoiding bending losses.

Rinzler, Charles C; Zediker, Mark S

2014-11-04T23:59:59.000Z

189

Erbium-doped transparent glass ceramic optical Characterization using mass spectroscopy and molecular dynamics modeling.  

E-Print Network [OSTI]

Erbium-doped transparent glass ceramic optical fibres: Characterization using mass spectroscopy) doped silica-based optical fibres with transparent glass ceramic (TGC) core were fabricated through properties of the erbium ions embedded within the phospho-silicate DNP. These results permit to get more

Boyer, Edmond

190

DOE, City of Richland and Benton PUD Increase Fiber Optic Telecommunication  

Broader source: Energy.gov (indexed) [DOE]

DOE, City of Richland and Benton PUD Increase Fiber Optic DOE, City of Richland and Benton PUD Increase Fiber Optic Telecommunication Capacity in Benton County - Upgrade improves communications at Hanford Site, schools and libraries DOE, City of Richland and Benton PUD Increase Fiber Optic Telecommunication Capacity in Benton County - Upgrade improves communications at Hanford Site, schools and libraries March 14, 2013 - 12:00pm Addthis Fiber Optic Broadband Fiber Optic Broadband Media Contact Cameron Salony, 509-376-0402 Cameron.Salony@rl.doe.gov RICHLAND, Wash. - The Department of Energy (DOE), city of Richland, and Benton County's Public Utility District (Benton PUD) jointly implemented a high-capacity fiber optic cable in Richland and at the Hanford Site. The project will improve communications throughout the area.

191

Fiber optic probe of free electron evanescent fields in the optical frequency range  

SciTech Connect (OSTI)

We introduce an optical fiber platform which can be used to interrogate proximity interactions between free-electron evanescent fields and photonic nanostructures at optical frequencies in a manner similar to that in which optical evanescent fields are sampled using nanoscale aperture probes in scanning near-field microscopy. Conically profiled optical fiber tips functionalized with nano-gratings are employed to couple electron evanescent fields to light via the Smith-Purcell effect. We demonstrate the interrogation of medium energy (30–50?keV) electron fields with a lateral resolution of a few micrometers via the generation and detection of visible/UV radiation in the 700–300?nm (free-space) wavelength range.

So, Jin-Kyu, E-mail: js1m10@orc.soton.ac.uk; MacDonald, Kevin F. [Optoelectronics Research Centre and Centre for Photonic Metamaterials, University of Southampton, Highfield, Southampton SO17 1BJ (United Kingdom); Zheludev, Nikolay I. [Optoelectronics Research Centre and Centre for Photonic Metamaterials, University of Southampton, Highfield, Southampton SO17 1BJ (United Kingdom); Centre for Disruptive Photonic Technologies, Nanyang Technological University, Singapore 637371 (Singapore)

2014-05-19T23:59:59.000Z

192

Three dimensional imaging detector employing wavelength-shifting optical fibers  

DOE Patents [OSTI]

A novel detector element structure and method for its use is provided. In a preferred embodiment, one or more inorganic scintillating crystals are coupled through wavelength shifting optical fibers (WLSFs) to position sensitive photomultipliers (PS-PMTs). The superior detector configuration in accordance with this invention is designed for an array of applications in high spatial resolution gamma ray sensing with particular application to SPECT, PET and PVI imaging systems. The design provides better position resolution than prior art devices at a lower total cost. By employing wavelength shifting fibers (WLSFs), the sensor configuration of this invention can operate with a significant reduction in the number of photomultipliers and electronics channels, while potentially improving the resolution of the system by allowing three dimensional reconstruction of energy deposition positions.

Worstell, William A. (Framingham, MA)

1997-01-01T23:59:59.000Z

193

Three dimensional imaging detector employing wavelength-shifting optical fibers  

DOE Patents [OSTI]

A novel detector element structure and method for its use is provided. In a preferred embodiment, one or more inorganic scintillating crystals are coupled through wavelength shifting optical fibers (WLSFs) to position sensitive photomultipliers (PS-PMTs). The superior detector configuration in accordance with this invention is designed for an array of applications in high spatial resolution gamma ray sensing with particular application to SPECT, PET and PVI imaging systems. The design provides better position resolution than prior art devices at a lower total cost. By employing wavelength shifting fibers (WLSFs), the sensor configuration of this invention can operate with a significant reduction in the number of photomultipliers and electronics channels, while potentially improving the resolution of the system by allowing three dimensional reconstruction of energy deposition positions. 11 figs.

Worstell, W.A.

1997-02-04T23:59:59.000Z

194

Nonlocal memory assisted entanglement distribution in optical fibers  

E-Print Network [OSTI]

Successful implementation of several quantum information and communication protocols require distributing entangled pairs of quantum bits in reliable manner. While there exists a substantial amount of recent theoretical and experimental activities dealing with non-Markovian quantum dynamics, experimental application and verification of the usefulness of memory-effects for quantum information tasks is still missing. We combine these two aspects and show experimentally that a recently introduced concept of nonlocal memory effects allows to protect and distribute polarization entangled pairs of photons in efficient manner within polarization-maintaining (PM) optical fibers. The introduced scheme is based on correlating the environments, i.e. frequencies of the polarization entangled photons, before their physical distribution. When comparing to the case without nonlocal memory effects, we demonstrate at least 12-fold improvement in the channel, or fiber length, for preserving the highly-entangled initial polarization states of photons against dephasing.

Guo-Yong Xiang; Zhi-Bo Hou; Chuan-Feng Li; Guang-Can Guo; Heinz-Peter Breuer; Elsi-Mari Laine; Jyrki Piilo

2014-01-20T23:59:59.000Z

195

Core stress distribution of phase shifting multimode polymer optical fiber  

SciTech Connect (OSTI)

Poly-(methyl methacrylate-co-benzyl methacrylate) polarization-maintaining optical fibers are known for their high response to normal stress. In this report, responses to higher stress levels up to 0.45?MPa were investigated. The stress amplitude and direction in the fiber cross section were calculated and analyzed with a coincident mode-field obtained from the near-field pattern. The stress amplitude varies significantly in the horizontal direction and is considered to create multiple phases, explaining the measurement results. To investigate possible permanent deformation, the core yield point profile was analyzed. Although it largely exceeds the average applied stress, the calculated stress distribution indicates that the core could partially experience stress that exceeds the yield point.

Furukawa, Rei, E-mail: furukawa@ee.uec.ac.jp; Matsuura, Motoharu [Center for Frontier Science and Engineering, The University of Electro-Communications, Chofugaoka 1-5-1, Chofu, Tokyo 182-8585 (Japan)] [Center for Frontier Science and Engineering, The University of Electro-Communications, Chofugaoka 1-5-1, Chofu, Tokyo 182-8585 (Japan); Nagata, Morio; Mishima, Kenji [Research Center for Advanced Science and Technology, The University of Tokyo, Meguro-ku, Tokyo 153-8904 (Japan)] [Research Center for Advanced Science and Technology, The University of Tokyo, Meguro-ku, Tokyo 153-8904 (Japan); Inoue, Azusa; Tagaya, Akihiro; Koike, Yasuhiro [Keio Photonics Research Institute, Keio University, Saiwaiku Shinkawasaki 7-1, Kawasaki, Kanagawa 212-0032 (Japan)] [Keio Photonics Research Institute, Keio University, Saiwaiku Shinkawasaki 7-1, Kawasaki, Kanagawa 212-0032 (Japan)

2013-11-18T23:59:59.000Z

196

IDENTIFICATION OF DAMAGE TYPES IN CARBON FIBER REINFORCED PLASTIC LAMINATES BY A NOVEL OPTICAL FIBER ACOUSTIC EMISSION SENSOR  

E-Print Network [OSTI]

IDENTIFICATION OF DAMAGE TYPES IN CARBON FIBER REINFORCED PLASTIC LAMINATES BY A NOVEL OPTICAL technology. PZT sensors have been being used as AE sensors. However, because this kind of sensor has bulk

Boyer, Edmond

197

Optical power transversely scattered from fiber Bragg gratings:?far-field measurements and modeling  

Science Journals Connector (OSTI)

Far-field properties of the optical power scattered from type IIA Bragg gratings photowritten within high-N.A. germanosilicate fibers have been studied under various experimental...

Pureur, D; Martinelli, G; Bernage, P; Niay, P; Douay, M; Monerie, M

1997-01-01T23:59:59.000Z

198

Fiber optic spectroscopic digital imaging sensor and method for flame properties monitoring  

DOE Patents [OSTI]

A system for real-time monitoring of flame properties in combustors and gasifiers which includes an imaging fiber optic bundle having a light receiving end and a light output end and a spectroscopic imaging system operably connected with the light output end of the imaging fiber optic bundle. Focusing of the light received by the light receiving end of the imaging fiber optic bundle by a wall disposed between the light receiving end of the fiber optic bundle and a light source, which wall forms a pinhole opening aligned with the light receiving end.

Zelepouga, Serguei A. (Hoffman Estates, IL); Rue, David M. (Chicago, IL); Saveliev, Alexei V. (Chicago, IL)

2011-03-15T23:59:59.000Z

199

How the pitch of a holey optical fiber affects its lightguide properties  

Science Journals Connector (OSTI)

This paper discusses how scaling (increasing) the transverse dimensions of a holey optical quartz fiber affects its lightguide properties. It is established that a limiting pitch...

Dukel'skii, K V; Kondrat'ev, Yu N; Komarov, A V; Ter-Nersesyants, E V; Khokhlov, A V; Shevandin, V S

2006-01-01T23:59:59.000Z

200

Design of the microstructured optical fiber-based surface plasmon resonance sensors with enhanced microfluidics  

Science Journals Connector (OSTI)

The concept of a Microstructured Optical Fiber-based Surface Plasmon Resonance sensor with optimized microfluidics is proposed. In such a sensor plasmons on the inner surface of...

Hassani, A; Skorobogatiy, M

2006-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "optical glass fibers" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

Fiber-optic heterodyne phase-shift measurement of plasma current  

Science Journals Connector (OSTI)

By combining twisted optical sensing fiber and heterodyne phase detection of circular birefringence we have (a) overcome the distortion problem caused by residual linear birefringence...

Chandler, George I; Forman, P R; Jahoda, F C; Klare, K A

1986-01-01T23:59:59.000Z

202

New IR Fiber-Optic Chemical Sensor for in Situ Measurements of Chlorinated Hydrocarbons in Water  

Science Journals Connector (OSTI)

In this work the development and validation of a new MIR fiber-optic physicochemical sensor system for the continuous in situ analysis of chlorinated hydrocarbons (CHCs) in...

Krska, R; Taga, K; Kellner, R

1993-01-01T23:59:59.000Z

203

Linearity and CNR Improvement Technologies against Optical Reflection inFiber-Oriented Wireless Access Systems  

Science Journals Connector (OSTI)

It is important to consider optical reflection conditions when designing fiber-oriented wireless access systems around subcarrier optical transmission since the noise characteristic can be significantly degraded by optical reflection, especially ... Keywords: intensity noise, optical reflection, predistorter, subcarrier optical transmission, superimposed subcarrier modulation, superluminescent diode

Yuji Aburakawa; Hiroyuki Ohtsuka

2000-11-01T23:59:59.000Z

204

Soranakom, C., Bakhshi M. , and Mobasher, B. " Role of Alkali Resistant Glass Fibers in Suppression of Restrained Shrinkage Cracking of Concrete Materials," 15th International Glass Fibre Reinforced Concrete Association  

E-Print Network [OSTI]

Soranakom, C., Bakhshi M. , and Mobasher, B. " Role of Alkali Resistant Glass Fibers in Suppression of Restrained Shrinkage Cracking of Concrete Materials," 15th International Glass Fibre Reinforced Concrete Association Congress, GRC 2008, CD-Proceedings, Prague, April 20-23, 2008. 1 Role of Alkali Resistant Glass

Mobasher, Barzin

205

Fiber optic device for sensing the presence of a gas  

DOE Patents [OSTI]

A fiber-optic device for sensing the presence of a gas in an environment is provided. The device comprises a light source for directing a light beam to a layer system having a first surface and a second surface opposite the first surface. The first surface is exposable to the light beam and the second surface is exposable to the environment. A first light portion encounters and reflects from the first surface at an angle of incidence free from optical wave guide resonance phenomenon and the second light portion encounters and reflects from the first surface at an angle of incidence enabling an optical wave guide resonance phenomenon. The layer system is selected to reversibly react with the gas to be detected. The reaction between the gas and the material changes the material's optical properties and the wavelength at which the optical wave guide resonance occurs. Furthermore, a mechanism for measuring the intensity of the reflected first light portion relative to the reflected second light portion is provided with the ratio of the first and second light portions indicating the concentration of the gas presence in the environment.

Benson, David K. (14154 W. First Dr., Golden, CO 80401); Bechinger, Clemens S. (35 S. Holman Way, # 3D, Golden, CO 80401); Tracy, C. Edwin (19012 W. 60th Dr., Golden, CO 80403)

1998-01-01T23:59:59.000Z

206

Fabrication of miniature fiber-optic temperature sensors  

DOE Patents [OSTI]

A method of coupling a silica fiber and a sapphire fiber includes providing a silica fiber having a doped core and a cladding layer, with the doped core having a prescribed diameter, providing a sapphire fiber having a diameter less than the doped core, placing an end of the sapphire fiber in close proximity to an end of the silica fiber, applying a heat source to the end of silica fiber and introducing the end of sapphire fiber into the heated doped core of the silica fiber to produce a coupling between the silica and sapphire fibers.

Zhu, Yizheng (Durham, NC); Wang, Anbo (Blacksburg, VA)

2010-07-27T23:59:59.000Z

207

Optical Fiber Sensor Technologies for Efficient and Economical Oil Recovery  

SciTech Connect (OSTI)

The overall goal of this project was to develop reliable cost effective sensors for application in the down-hole environment. The physical parameters measured by these sensors were temperature, pressure, flow and acoustic signals. Sensor head configurations for each of the physical measurands were optimized to increase the sensitivity to the particular measurand of interest while decreasing the cross-sensitivity to the other physical measurands and to environmental influences. In addition, the optical signal demodulation electronics was designed to be insensitive to environmental influences while maintaining the required resolution, precision and accuracy of the parameter being sensed. The influence of potentially detrimental agents such as water in the down-hole environment was investigated as well as methods to protect both the optical fiber and the sensor from these detrimental effects.

Wang, a.; Pickrell, G.; Xiao, H.; May, r.

2003-02-27T23:59:59.000Z

208

Energy conversion in Er3+ doped chalcogenide fibers for gas optical sensor  

Science Journals Connector (OSTI)

Er3+ doped chalcogenide fibers are used to convert a 4.3 µm optical signal into an 800 nm radiation with the aim of developing an all-optical infrared gas sensor with a detection in...

Anne-Laure, Pelé; Doualan, Jean-Louis; Braud, Alain; Nazabal, Virginie; Moncorgé, Richard; Camy, Patrice

209

Deposition and characterization of metal sulfide dielectric coatings for hollow glass waveguides  

E-Print Network [OSTI]

by chemical bath deposition for solar energy related applications," Solar Energy Materials and Solar Cells 52 coatings for Ag/dielectric hollow glass waveguides," in Optical Fibers and Sensors for Medical Applications for hollow glass waveguides," in Optical Fibers and Sensors for Medical Applications III, Proc. SPIE 4957, 97

210

Fiber optic sensing technology for measuring in-cylinder pressure in automotive engines  

E-Print Network [OSTI]

A new fiber optic sensing technology for measuring in-cylinder pressure in automotive engines was investigated. The optic sensing element consists of two mirrors in an in-line single mode fiber that are separated by some distance. To withstand...

Bae, Taehan

2006-10-30T23:59:59.000Z

211

Borosilicate clad fused silica core fiber optical waveguide with low transmission loss prepared by a high?efficiency process  

Science Journals Connector (OSTI)

A method for making fused silica core?borosilicate clad optical fiberwaveguides is described. The process involves the growth of a needlelike layer of borosilicate glass onto the surface of a commercially available high?purity fused silica rod by an efficient flamereaction of boron and silicon hydrides with oxygen. The needlelike layer is subsequently heat treated at relatively low temperature to form a homogeneous bubble?free glass with a smooth surface. It is then covered with a thin protective jacket of silica and drawn into a fiber. These fibers have attenuation coefficients only slightly greater than the bulk loss of the fused silica core materials. Over the Al1?x Ga x As injection laser wavelength range 0.82–0.88 ?m the loss is 5 dB/km while at the YAG : Nd laser wavelength 1.06 ?m it is 3 dB/km. The process appears to be attractive for the economical manufacture of low?loss fibers due to its simplicity and high chemical conversion efficiency.

F. W. Dabby; D. A. Pinnow; F. W. Ostermayer; L. G. Van Uitert; M. A. Saifi; I. Camlibel

1974-01-01T23:59:59.000Z

212

Simultaneous Suppression of Third-Order Dispersion and Sideband Instability in Single-Channel Optical Fiber Transmission by Midway Optical Phase Conjugation Employing Higher Order Dispersion Management  

Science Journals Connector (OSTI)

In optical phase conjugation (OPC) systems, the third-order dispersion (TOD) of optical fibers and the nonlinear resonance at well-defined signal sideband frequencies called sideband...

Kaewplung, Pasu; Angkaew, Tuptim; Kikuchi, Kazuro

2003-01-01T23:59:59.000Z

213

Optical loss reduction in HIC chalcogenide glass waveguides via thermal reflow  

E-Print Network [OSTI]

A rapid thermal reflow technique is applied to high-index-contrast, sub-micron waveguides in As[subscript 2]S[subscript 3] chalcogenide glass to reduce sidewall roughness and associated optical scattering loss. Up to 50% ...

Hu, Juejun

214

Apparatus for injecting high power laser light into a fiber optic cable  

DOE Patents [OSTI]

High intensity laser light is evenly injected into an optical fiber by the combination of a converging lens and a multisegment kinoform (binary optical element). The segments preferably have multi-order gratings on each which are aligned parallel to a radial line emanating from the center of the kinoform and pass through the center of the element. The grating in each segment causes circumferential (lateral) dispersion of the light, thereby avoiding detrimental concentration of light energy within the optical fiber.

Sweatt, William C. (Albuquerque, NM)

1997-01-01T23:59:59.000Z

215

Fiber optic coupling of a microlens conditioned, stacked semiconductor laser diode array  

DOE Patents [OSTI]

The output radiation from the two-dimensional aperture of a semiconductor laser diode array is efficiently coupled into an optical fiber. The two-dimensional aperture is formed by stacking individual laser diode bars on top of another in a "rack and stack" configuration. Coupling into the fiber is then accomplished using individual microlenses to condition the output radiation of the laser diode bars. A lens that matches the divergence properties and wavefront characteristics of the laser light to the fiber optic is used to focus this conditioned radiation into the fiber.

Beach, Raymond J. (Livermore, CA); Benett, William J. (Livermore, CA); Mills, Steven T. (Antioch, CA)

1997-01-01T23:59:59.000Z

216

Magneto-optical disk drive technology using multiple fiber-coupled flying optical heads. Part II. Laser noise considerations  

Science Journals Connector (OSTI)

A magneto-optical data storage system utilizing single-mode fiber is capable of providing high signal-to-noise ratio (SNR) recording if laser noise sources are properly managed. In...

Wilde, Jeffrey P; Tselikov, Alexander A; Gray, George R; Zhang, Yongwei; Gangopadhyay, Shubhagat

2002-01-01T23:59:59.000Z

217

NETL: Gasification - Single-Crystal Sapphire Optical Fiber Sensor  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Gasifier Optimization and Plant Supporting Systems Gasifier Optimization and Plant Supporting Systems Single-Crystal Sapphire Optical Fiber Sensor Instrumentation Virginia Polytechnic Institute and State University Center for Photonics Technology Project Number: DE-FC26-99FT40685 Project Description Phase I - The Photonics Laboratory at Virginia Tech has successfully developed a novel temperature sensor capable of operating at temperatures up to 1600 °C and in harsh conditions. The sensor uses single-crystal sapphire to make an optically-based measurement and will fulfill the need for the real-time monitoring of high temperatures created in gasification processes. Phase II - Based on a successful Phase I laboratory demonstration of a Broadband Polarimetric Differential Interferometric (BPDI) temperature sensor, Virginia Tech's Phase II development objective is to further the development of the sensor for industrial use in slagging coal gasifiers. This will include ruggedizing the design of the sensor and creation of a suitable protective housing such that it can be placed into existing ports of coal gasifiers. The potential industrial use of the sensor will be determined through full-scale testing and development. The sensor design and fabrication has been completed and is undergoing testing. Overall performance and survivability of the sensor will be determined.

218

Ice structure monitoring with an optical fiber sensing system  

Science Journals Connector (OSTI)

Ice has been used as an effective and economical material for constructions of roads and platforms in cold regions. However, the practical applications of this brittle material are limited by the fact that ice structures can suddenly crack due to low tensile strength, be crushed due to excessive compression, melt and become soften as temperature elevates. In this paper, an early warning system is proposed to monitor the strain state and damage characteristic of ice structures. Firstly, both fiber Bragg grating (FBG) and Brillouin optical time domain analysis/reflectometry (BOTDA/R) sensors were installed in an ice block and an ice beam to understand their axial and flexural behaviors under a concentrated load. Secondly, the solution for strain state and damage process of ice structures was derived analytically under test conditions. Finally, an outdoor ice road test bed was built and continuously monitored for 34 h to validate the early warning system and understand the early stage behavior of ice structures. The experimental results agreed well with their corresponding theoretical predictions. The early warning system with optical sensors is effective and practical for long-term monitoring for ice structures.

Zhi Zhou; Minghua Huang; Jianping He; Genda Chen; Jinping Ou

2010-01-01T23:59:59.000Z

219

Effect of CaF{sub 2} addition on optical properties of barium phosphate glasses  

SciTech Connect (OSTI)

Ternary barium phosphate glasses, (50?X)BaO?XCaF{sub 2}?50P{sub 2}O{sub 5} have been prepared by adding 0-10 mol% of CaF{sub 2} to binary barium phosphate glasses. The amorphous nature of the prepared glasses was confirmed by X-ray diffraction technique. The UV-Visible absorption spectra have been recorded, optical band gap energy Eopt and Urbach energy Etail were determined. Shift in Eopt and Etail with increase in concentration of CaF{sub 2} is noted. FTIR analysis was carried out to investigate the short and intermediate-range orders in glasses. Shift of (P-O-P) band to higher wave number with the substitution of BaO with CaF{sub 2} shows the shortening of the phosphate chains. Hardness and density of glass samples were measured and correlated with the composition of glasses.

Kumar, N. Manoj, E-mail: manukokkal01@gmail.com; Rao, G. Venkateswara, E-mail: manukokkal01@gmail.com; Akhila, B. E., E-mail: manukokkal01@gmail.com; Shashikala, H. D., E-mail: manukokkal01@gmail.com [Department of Physics, National Institute of Technology Karnataka, Surathkal, Srinivasnagar -575025, Karnataka (India)

2014-04-24T23:59:59.000Z

220

Method of producing optical quality glass having a selected refractive index  

DOE Patents [OSTI]

Optical quality glass having a selected refractive index is produced by a two stage drying process. A gel is produced using sol-gel chemistry techniques and first dried by controlled evaporation until the gel volume reaches a pre-selected value. This pre-selected volume determines the density and refractive index of the finally dried gel. The gel is refilled with solvent in a saturated vapor environment, and then dried again by supercritical extraction of the solvent to form a glass. The glass has a refractive index less than the full density of glass, and the range of achievable refractive indices depends on the composition of the glass. Glasses having different refractive indices chosen from an uninterrupted range of values can be produced from a single precursor solution.

Poco, John F. (Livermore, CA); Hrubesh, Lawrence W. (Livermore, CA)

2000-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "optical glass fibers" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

Loss of polarization entanglement in a fiber-optic system with polarization mode dispersion in one optical path  

E-Print Network [OSTI]

We characterize theoretically and experimentally the degradation of polarization entanglement in a fiber-optic entanglement distribution system where one of the optical fibers is exposed to the effects of polarization mode dispersion (PMD). We show gradual reduction of entanglement with increasing PMD and find that the highest PMD tolerance is achieved when the bandwidth of the pump used to generate the entangled photons in a $\\chi^{(3)}$ process is approximately half the bandwidth of the quantum channels.

Misha Brodsky; Elizabeth C. George; Cristian Antonelli; Mark Shtaif

2010-11-26T23:59:59.000Z

222

Indentation experiments on silica optical fibers Bochien Lin  

E-Print Network [OSTI]

fibers, the intrinsic strength seems close to "perfect" 1 Currently, the standard subcritical crack water, fibers exhibit a lower value of n at low applied stress/long time to failure which shows

Matthewson, M. John

223

Strength Degradation of Mechanical Properties of Unidirectional E- Glass Fiber Epoxy Resin Nanoclay Composites under Hygrothermal Loading Conditions  

Science Journals Connector (OSTI)

Abstract Glass fiber reinforced polymer (GFRP) plays a vital role in many industries because of its high strength to weight ratio. Its strength properties are somewhat lower than carbon fibre and it is less stiff and brittle. Using glass fibre in industries because of its raw material is much less expensive with compare to other materials. In the present work, the epoxy resin was modified using natural montmorillonite Closite 30B (1 wt%, 3 wt%, 5 wt%) nanoclay is used with E-glass unidirectional fiber to manufacture fiber reinforced nanocomposite using hand layup method. Three different types of fiber reinforced nanocomposites are fabricated using 1wt% nanoclay, 3wt% nanoclay and 5wt% nanoclay with 30% wt fiber, epoxy resin and hardener. The epoxy resin and hardener are mixed in 10:4 weight ratios. Three different test, tensile test, hardness test and flexural test were measured through using mechanical test instruments. The mechanical test shows that the tensile and flexural strength for 3wt% nanoclay composite is more compared to 1wt% and 5wt% nanoclay composite. To improve the flexural and tensile properties are 57% and 8% respectively by adding 3wt% of nanoclay. Micro hardness test for 3wt% of nanoclay composite is higher compare to 1wt% and 5wt% nanoclay composite and further increase beyond 3wt% nanoclay hardness start decreasing .Further check durability the specimen were immersed in water and NaOH baths under accelerated hygrothermal loading for 30 days. Due to accelerated hygrothermal loading it is observed that the mechanical properties degradation in NaOH environment was more severe as compared to simple water.

S.K. Singh; S. Singh; S. Sharma; V. Sharma

2014-01-01T23:59:59.000Z

224

Investigation of mode coupling in optical fiber with controlled volume disorder  

E-Print Network [OSTI]

configurations of controlled disorder in optical fibers suitable for such applications as random fiber lasers benefits observed when disorder is induced into a mundane system. A random laser1 , where laser action diameter is 7.66 microns, the cladding diameter is 125 microns, NA = 0.13 with the refractive indexes

Yamilov, Alexey

225

Apparent activation energy of fused silica optical fibers in static fatigue in aqueous environments  

E-Print Network [OSTI]

to occur when ambient moisture reacts with the fiber surface causing subcritical crack growth.1Ă?3 Fatigue of silica optical fiber is therefore controlled by the crack growth rate, c : , which depends for the crack growth, which was originally proposed by Charles and Hillig, based on simple chemical kinetics

Matthewson, M. John

226

Detection of Ethanol in Wines Using Optical-Fiber Measurements and Near-Infrared Analysis  

Science Journals Connector (OSTI)

Optical-fiber measurements coupled with near-infrared analysis is used to predict the ethanol content of wine samples to within ±0.33 volume percent. Because telecommunications-grade...

Buchanan, B R; Honigs, D E; Lee, Cynthia J; Roth, William

1988-01-01T23:59:59.000Z

227

Influence of optical fibers on the spectrum of transmitted light-emitting-diode radiation  

Science Journals Connector (OSTI)

Propagation of GaxIn1–xAsyP1–y light-emitting-diode radiation through an optical fiber was found to affect its spectral curve very strongly, and the origin of...

Zavadil, Jirí; Honc, Tomáš; Ctyroký, Jirí

1995-01-01T23:59:59.000Z

228

Energy-time entanglement generation in optical fibers under CW pumping  

Science Journals Connector (OSTI)

In this paper, the energy-time entangled photon-pairs at 1.5 ?m are generated by the spontaneous four wave mixing (SFWM) in optical fibers under continuous wave (CW) pumping. The...

Dong, Shuai; Zhou, Qiang; Zhang, Wei; He, Yuhao; Zhang, Weijun; You, Lixing; Huang, Yidong; Peng, Jiangde

2014-01-01T23:59:59.000Z

229

Low cost, practical, all-digital open-loop fiber-optic gyroscope  

Science Journals Connector (OSTI)

A novel all-digital scheme for open-loop fiber-optic gyroscope (FOG), where only two key points of output wave were digitized directly, has been proposed. A control equation, with...

Yang, Yuanhong; Zhang, Weixu; Ma, Jing; Chen, Xinjun

2003-01-01T23:59:59.000Z

230

Non-contact Micro Vibration Measurement System Based on Optical Fiber Michelson Interferometer  

Science Journals Connector (OSTI)

In this paper, an optical fiber Michelson interferometer is used to realize non-contact micro vibration measurement. The frequency response range of 1~1KHz and the displacement...

Xing, Chuanqi; Jing, Zhenguo; Peng, Wei

231

Generating and measuring photochemical changes inside the brain using optical fibers: exploring stroke  

Science Journals Connector (OSTI)

We report here on the development of a method for inducing a stroke in a specific location within a mouse brain through the use of an optical fiber. By capturing the emitted...

Tsiminis, Georgios; Klari?, Thomas S; Schartner, Erik P; Warren-Smith, Stephen C; Lewis, Martin D; Koblar, Simon A; Monro, Tanya M

2014-01-01T23:59:59.000Z

232

Fiber-Optic Sensors: Playing Both Sides of the Energy Equation  

Science Journals Connector (OSTI)

Fiber-optic sensors are playing an emerging role in both new energy-generation technologies-including wind, solar and geothermal-and approaches for improving recovery of our existing...

Sanders, Paul E

2011-01-01T23:59:59.000Z

233

Theoretical and practical response evaluation of a fiber optic sensor for chlorinated hydrocarbons in water  

Science Journals Connector (OSTI)

The response behavior of a polymer-coated mid-infrared fiber optical sensor for chlorinated hydrocarbons in water is evaluated practically and theoretically. The sensor ... - and tetrachloroethylene obtained in a...

E. Rosenberg; R. Krska; R. Kellner

234

Scale-factor-stabilized fiber-optic gyroscope by deep phase modulation  

Science Journals Connector (OSTI)

A scale-factor-stabilized fiber-optic gyroscope by deep phase modulation is demonstrated. There are two servo loops included in this system. The first servo loop is used for...

Chien, Pie-Yau; Pan, Ci-Ling

1992-01-01T23:59:59.000Z

235

Multiplexed fiber-optic sensors using a dual-slope frequency-modulated source  

Science Journals Connector (OSTI)

We propose and demonstrate a multiplexed fiber-optic sensor system using a dual-slope (triangular) frequency-modulated laser source. The restrictions in the selection of beat...

Chien, Pie-Yau; Pan, Ci-Ling

1991-01-01T23:59:59.000Z

236

A Fiber Optic Spectrometry System for Measuring Irradiance Distributions in Sea Ice Environments  

Science Journals Connector (OSTI)

A fiber optic–based spectrometry system was developed to enable automated, long-term measurements of spectral irradiance in sea ice environments. This system utilizes a single spectrometer module that measures the irradiance transmitted by ...

Hangzhou Wang; Ying Chen; Hong Song; Samuel R. Laney

2014-12-01T23:59:59.000Z

237

Environmental effects on fatigue and lifetime predictions for silica optical fibers  

E-Print Network [OSTI]

reliability of optical fibers is usually assessed using the subcritical crack growth model for fatigue defects (normally assumed to be cracks) to cause the defects to grow at applied stress levels which do

Matthewson, M. John

238

Non-monotonous refractive index changes recorded in a phosphate glass optical fibre using 248nm, 500fs laser radiation  

Science Journals Connector (OSTI)

Results are presented on the photosensitivity behavior of a phosphate glass optical fibre using 248nm, 500fs laser radiation. Bragg grating exposures performed using a double phase...

Sozzi, Michele; Rahman, Aashia; Pissadakis, Stavros

2011-01-01T23:59:59.000Z

239

JOURNAL OF MICROELECTROMECHANICAL SYSTEMS, VOL. 12, NO. 6, DECEMBER 2003 907 Digitally Tunable Microfluidic Optical Fiber Devices  

E-Print Network [OSTI]

Microfluidic Optical Fiber Devices Francesco Cattaneo, Kirk Baldwin, Shu Yang, Tom Krupenkine, Siddharth microfluidic optical fiber devices. In these systems, mul- tiple, independently controlled microfluidic plugs- tion of this type of microfluidic fiber device. [991] Index Terms--Fluidics, microfluidics, micropumps

Rogers, John A.

240

Single-Crystal Sapphire Optical Fiber Sensor Instrumentation for Coal Gasifiers  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Single-Crystal Sapphire Optical Fiber Single-Crystal Sapphire Optical Fiber Sensor Instrumentation for Coal Gasifiers Description Accurate temperature measurement inside a coal gasifier is essential for safe, efficient, and cost-effective operation. However, current sensors are prone to inaccurate readings and premature failure due to harsh operating conditions like high temperature (1,200-1,600 °C), high pressure (up to 500 pounds per square inch gauge [psig]),

Note: This page contains sample records for the topic "optical glass fibers" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

Optical fibre with a germanate glass core for lasing near 2 {mu}m  

SciTech Connect (OSTI)

An optical fibre with a core based on thulium-doped germanate glass (45SiO{sub 2} - 55GeO{sub 2}) and a quartz glass cladding is developed for the first time. Lasing on Tm{sup 3+} ions ({lambda} =1.862 {mu}m) with an output power up to 70 mW at a differential efficiency of 37% is obtained in a laser based on this fibre. (letters)

Dvoirin, Vladislav V; Mashinskii, Valerii M; Iskhakova, L D; Dianov, Evgenii M [Fiber Optics Research Center, Russian Academy of Sciences, Moscow (Russian Federation); Yashkov, M V; Khopin, V F; Gur'yanov, Aleksei N [Institute of Chemistry of High-Purity Substances, Russian Academy of Sciences, Nizhnii Novgorod (Russian Federation)

2011-01-24T23:59:59.000Z

242

Thermal characterization of submicron polyacrylonitrile fibers based on optical heating and electrical thermal sensing  

SciTech Connect (OSTI)

In this work, the thermal diffusivity of single submicron ({approx}800 nm) polyacrylonitrile (PAN) fibers is characterized using the recently developed optical heating and electrical thermal sensing technique. In the experiment, a thin Au film (approximately in the nanometer range) is coated on the surface of nonconductive PAN fibers. A periodically modulated laser beam is used to irradiate suspended individual fibers to achieve noncontact periodical heating. The periodical temperature response of the sample is monitored by measuring the electrical resistance variation of the thin Au coating. The experimental results for three different synthesized PAN fibers with varying Au coating thickness are presented and discussed.

Hou Jinbo; Wang Xinwei; Zhang Lijun [Department of Mechanical Engineering, N104 Walter Scott Engineering Center, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0656 (United States)

2006-10-09T23:59:59.000Z

243

A loss-based, magnetic field sensor implemented in a ferrofluid infiltrated microstructured polymer optical fiber  

SciTech Connect (OSTI)

We report an in-fiber magnetic field sensor based on magneto-driven optical loss effects, while being implemented in a ferrofluid infiltrated microstructured polymer optical fiber. We demonstrate that magnetic field flux changes up to 2000 gauss can be detected when the magnetic field is applied perpendicular to the fiber axis. In addition, the sensor exhibits high polarization sensitivity for the interrogated wavelengths, providing the possibility of both field flux and direction measurements. The underlying physical and guidance mechanisms of this sensing transduction are further investigated using spectrophotometric, light scattering measurements, and numerical simulations, suggesting photonic Hall effect as the dominant physical, transducing mechanism.

Candiani, A. [Foundation for Research and Technology-Hellas (FORTH), Institute of Electronic Structure and Laser (IESL), Heraklion 70013 Greece (Greece); Department of Information Engineering (DII), University of Parma, Parma 43124 (Italy); Argyros, A.; Leon-Saval, S. G.; Lwin, R. [Institute of Photonics and Optical Science (IPOS), School of Physics, The University of Sydney, Sydney (Australia); Selleri, S. [Department of Information Engineering (DII), University of Parma, Parma 43124 (Italy); Pissadakis, S., E-mail: pissas@iesl.forth.gr [Foundation for Research and Technology-Hellas (FORTH), Institute of Electronic Structure and Laser (IESL), Heraklion 70013 Greece (Greece)

2014-03-17T23:59:59.000Z

244

Characterization of the Los Alamos IPG YLR-6000 fiber laser using multiple optical paths and laser focusing optics  

SciTech Connect (OSTI)

Fiber laser technology has been identified as the replacement power source for the existing Los Alamos TA-55 production laser welding system. An IPG YLR-6000 fiber laser was purchased, installed at SM-66 R3, and accepted in February 2008. No characterization of the laser and no welding was performed in the Feb 2008 to May 2009 interval. T. Lienert and J. Bernal (Ref. 1, July 2009) determined the existing 200 mm Rofin collimator and focus heads used with the Rofin diode pumped lasers were inadequate for use with the IPG laser due to clipping of the IPG laser beam. Further efforts in testing of the IPG laser with Optoskand fiber delivery optics and a Rofin 120 mm collimator proved problematic due to optical fiber damage. As a result, IPG design optical fibers were purchased as replacements for subsequent testing. Within the same interval, an IPG fiber-to-fiber (F2F) connector, custom built for LANL, (J. Milewski, S. Gravener, Ref.2) was demonstrated and accepted at IPG Oxford, MA in August 2009. An IPG service person was contracted to come to LANL to assist in the installation, training, troubleshooting and characterization of the multiple beam paths and help perform laser head optics characterization. The statement of work is provided below: In summary the laser system, optical fibers, F2F connector, Precitec head, and a modified Rofin type (w/120mm Optoskand collimator) IWindowIBoot system focus head (Figure 1) were shown to perform well at powers up to 6 kW CW. Power measurements, laser spot size measurements, and other characterization data and lessons learned are contained within this report. In addition, a number of issues were identified that will require future resolution.

Milewski, John O [Los Alamos National Laboratory; Bernal, John E [Los Alamos National Laboratory

2009-01-01T23:59:59.000Z

245

Volume 130, number 1,2 CHEMICAL PHYSICS LETTERS 26 September 1986 OPTICAL DEPHASING OF CHROMOPHORES IN AN ORGANIC GLASS  

E-Print Network [OSTI]

IN AN ORGANIC GLASS: PICOSECOND PHOTON ECHO AND HOLE BURNING EXPERIMENTS C.A. WALSH, M. BERG, L.R. NARASIMHAN The homogeneous optical dephasing time T2for the organic glass system resorufin in ethanol is measured-temperature properties of glasses are dis- tinctly different from those of crystals as has been demonstrated by thermal

Fayer, Michael D.

246

December 1, 2000 / Vol. 25, No. 23 / OPTICS LETTERS 1693 High-frequency Bragg gratings in a photothermorefractive glass  

E-Print Network [OSTI]

in a photothermorefractive glass O. M. Efimov, L. B. Glebov, and V. I. Smirnov School of Optics/Center for Research-2700 Received July 21, 2000 Holographic UV mirrors were recorded in a volume of photothermorefractive glass. This photosensitive sili- cate glass doped with silver, cerium, and fluorine is transparent in the near-UV, visible

Glebov, Leon

247

Volume 134, number 3 CHEMICAL PHYSICS LETTERS 27 February 1987 ULTRAFAST OPTICAL DEPHASING IN A LOW-TEMPERATURE ORGANIC GLASS  

E-Print Network [OSTI]

-TEMPERATURE ORGANIC GLASS C.A. WALSH, M. BERG, L.R. NARASIMHAN, Karl A. LITTAU and M.D. FAYER Department of Chemistry The optical dephasing of pentacene in an o-terphenyl glass at 1.5 K is examined with picosecond photon echo measurements on glass-chromophore systems in which the homogeneous 7'*are two to three orders of magnitude

Fayer, Michael D.

248

Multiparameter Fiber Optic Sensing System for Monitoring Enhanced...  

Broader source: Energy.gov (indexed) [DOE]

objectives: Demonstrate reliability of fiber and distributed temperature; strain and vibration sensing sub-systems for EGS at 374C and 220 bar in the presence of hydrogen....

249

Research On Fiber Optic Sensing Systems And Their Application As Final Repository Monitoring Tools  

SciTech Connect (OSTI)

For several years, fiber-optic sensing devices had been used for straightforward on/off monitoring functions such as presence and position detection. Recently, they gained interest as they offer a novel, exciting technology for a multitude of sensing applications. In the deep geological environment most physical properties, and thus most parameters important to safety, can be measured with fiber-optic technology. Typical examples are displacements, strains, radiation dose and dose rate, presence of some gases, temperature, pressure, etc. Their robustness, immunity to electromagnetic interference, as well as their large bandwidths and data rates ensure high reliability and superior performance. Moreover, the networking capabilities of meanwhile available fiber-optic sensors allow for efficient management of large sensor systems. Distributed sensing with multiple sensing locations on a single fiber reduces significantly the number of cables and connecting points. Reliable, cost effective, and maintenance-free solutions can thus be implemented.

Jobmann, M.; Biurrun, E.

2003-02-24T23:59:59.000Z

250

Separation of CO2 Using Ultra-Thin Multi-Layer Polymeric Membranes for Compartmentalized Fiber Optic Sensor Applications  

E-Print Network [OSTI]

Optic Sensor Applications by Benjamin Davies B.Eng., University of Guelph, 2011 A Thesis Submitted for Compartmentalized Fiber Optic Sensor Applications by Benjamin Davies B. Eng., University of Guelph, 2011 Supervisory trapping occurring through mineralization within the first 20-50 years. A fiber optic based monitoring

Victoria, University of

251

SINGLE-CRYSTAL SAPPHIRE OPTICAL FIBER SENSOR INSTRUMENTATION  

SciTech Connect (OSTI)

Accurate measurement of temperature is essential for the safe and efficient operation and control of a wide range of industrial processes. Appropriate techniques and instrumentation are needed depending on the temperature measurement requirements in different industrial processes and working environments. Harsh environments are common in many industrial applications. These harsh environments may involve extreme physical conditions, such as high-temperature, high-pressure, corrosive agents, toxicity, strong electromagnetic interference, and high-energy radiation exposure. Due to these severe environmental conditions, conventional temperature sensors are often difficult to apply. This situation has opened a new but challenging opportunity for the sensor society to provide robust, high-performance, and cost-effective temperature sensors capable of operating in those harsh environments. The focus of this research program has been to develop a temperature measurement system for temperature measurements in the primary and secondary stages of slagging gasifiers. For this application the temperature measurement system must be able to withstand the extremely harsh environment posed by the high temperatures and corrosive agents present in these systems. Real-time, accurate and reliable monitoring of temperature for the coal gasification process is important to realize the full economic potential of these gasification systems. Long life and stability of operation in the high temperature environment is essential for the temperature measurement system to ensure the continuous running of the coal gasification system over the long term. In this high temperature and chemically corrosive environment, rather limited high temperature measurement techniques such as high temperature thermocouples and optical/acoustic pyrometers are available, each with their own limitations. In this research program, five different temperature sensing schemes based on the single crystal sapphire material were thoroughly investigated to determine an optimal approach for on-line, real-time, reliable, long-term monitoring of temperatures inside the coal gasification environment. Among these were a sapphire fiber extrinsic Fabry-Perot interferometric (EFPI) sensor; an intensity-measurement based polarimetric sapphire sensor and a broadband polarimetric differential interferometric (BPDI) sapphire sensor. Based on the current evaluation and analysis of the experimental results, the broadband polarimetric differential interferometric (BPDI) sensor system was chosen for further prototype instrumentation development because of it's superior performance compared to the other systems. This approach is based on the self-calibrating measurement of the optical path length differences in a single-crystal sapphire disk, which is a function of both the temperature dependent birefringence and the temperature dependent dimensional changes.

A. Wang; G. Pickrell; R. May

2002-09-10T23:59:59.000Z

252

SINGLE-CRYSTAL SAPPHIRE OPTICAL FIBER SENSOR INSTRUMENTATION  

SciTech Connect (OSTI)

Accurate measurement of temperature is essential for the safe and efficient operation and control of a wide range of industrial processes. Appropriate techniques and instrumentation are needed depending on the temperature measurement requirements in different industrial processes and working environments. Harsh environments are common in many industrial applications. These harsh environments may involve extreme physical conditions, such as high-temperature, high-pressure, corrosive agents, toxicity, strong electromagnetic interference, and high-energy radiation exposure. Due to these severe environmental conditions, conventional temperature sensors are often difficult to apply. This situation has opened a new but challenging opportunity for the sensor society to provide robust, high-performance, and cost-effective temperature sensors capable of operating in those harsh environments. The focus of this research program has been to develop a temperature measurement system for temperature measurements in the primary and secondary stages of slagging gasifiers. For this application the temperature measurement system must be able to withstand the extremely harsh environment posed by the high temperatures and corrosive agents present in these systems. Real-time, accurate and reliable monitoring of temperature for the coal gasification process is important to realize the full economic potential of these gasification systems. Long life and stability of operation in the high temperature environment is essential for the temperature measurement system to ensure the continuous running of the coal gasification system over the long term. In this high temperature and chemically corrosive environment, rather limited high temperature measurement techniques such as high temperature thermocouples and optical/acoustic pyrometers are available, each with their own limitations. In this research program, five different temperature sensing schemes based on the single crystal sapphire material were thoroughly investigated to determine an optimal approach for on-line, real-time, reliable, long-term monitoring of temperatures inside the coal gasification environment. Among these were a sapphire fiber extrinsic Fabry-Perot interferometric (EFPI) sensor; an intensity-measurement based polarimetric sapphire sensor and a broadband polarimetric differential interferometric (BPDI) sapphire sensor. Based on the current evaluation and analysis of the experimental results, the BPDI sensor system was chosen for further prototype instrumentation development because of it's superior performance compared to the other systems. This approach is based on the self-calibrating measurement of the optical path length differences in a single-crystal sapphire disk, which is a function of both the temperature dependent birefringence and the temperature dependent dimensional changes.

A. Wang; G. Pickrell; R. May

2002-10-18T23:59:59.000Z

253

Structural and optical properties of Sb{sub 2}S{sub 3} nanocrystals in glass  

SciTech Connect (OSTI)

In this work conventional solid state precipitation method is adopted to fabricate Sb{sub 2}S{sub 3} nanocrystals in glass. The glass composition is optimized for proper host glass matrix to grow antimony trisulphide semiconductor quantum dots. The dot size is modified by heat treatment of glass samples in the temperature range from 550°C to 700°C for various time durations. Structural studies are carried out by X-ray diffraction and transmission electron microscopy and nanoparticles with size ranges from 8 nm to 70 nm are obtained. Quantum dots so grown were further characterized by optical absorption spectroscopy and a blue shift is observed for absorption edge energy that conform the quantum confinement effect.

Mishra, Rakesh K., E-mail: mishrarake@gmail.com; Kashyap, Raman, E-mail: mishrarake@gmail.com; Vedeshwar, A. G., E-mail: mishrarake@gmail.com; Tandon, R. P., E-mail: mishrarake@gmail.com [Department of Physics and Astrophysics, University of Delhi, Delhi 1-10007 (India)

2014-04-24T23:59:59.000Z

254

Micro optical fiber light source and sensor and method of fabrication thereof  

DOE Patents [OSTI]

This invention relates generally to the development of and a method of fabricating a micro optical fiber light source. An optical fiber micro-light source is presented whose aperture is extremely small yet able to act as an intense light source. Light sources of this type have wide ranging applications, including use as micro-sensors in NSOM. Micro-sensor light sources have excellent detection limits as well as photo stability, reversibility, and millisecond response times. Furthermore, a method for manufacturing a micro optical fiber light source is provided. It involves the photo-chemical attachment of an optically active material onto the end surface of an optical fiber cable which has been pulled to form an end with an extremely narrow aperture. More specifically, photopolymerization has been applied as a means to photo-chemically attach an optically active material. This process allows significant control of the size of the micro light source. Furthermore, photo-chemically attaching an optically active material enables the implementation of the micro-light source in a variety of sensor applications. 4 figs.

Kopelman, R.; Tan, W.; Shi, Z.Y.

1994-11-01T23:59:59.000Z

255

Micro optical fiber light source and sensor and method of fabrication thereof  

DOE Patents [OSTI]

This invention relates generally to the development of and a method of fabricating a fiber optic micro-light source and sensor (50). An optical fiber micro-light source (50) is presented whose aperture is extremely small yet able to act as an intense light source. Light sources of this type have wide ranging applications, including use as micro-sensors (22) in NSOM. Micro-sensor light sources have excellent detection limits as well as photo stability, reversibility, and millisecond response times. Furthermore, a method for manufacturing a micro optical fiber light source is provided. It involves the photo-chemical attachment of an optically active material onto the end surface of an optical fiber cable which has been pulled to form an end with an extremely narrow aperture. More specifically, photopolymerization has been applied as a means to photo-chemically attach an optically active material (60). This process allows significant control of the size of the micro light source (50). Furthermore, photo-chemically attaching an optically active material (60) enables the implementation of the micro-light source in a variety of sensor applications.

Kopelman, Raoul (Ann Arbor, MI); Tan, Weihong (Ames, IA); Shi, Zhong-You (Ann Arbor, MI)

1997-01-01T23:59:59.000Z

256

Micro optical fiber light source and sensor and method of fabrication thereof  

DOE Patents [OSTI]

This invention relates generally to the development of and a method of fabricating a micro optical fiber light source. An optical fiber micro-light source is presented whose aperture is extremely small yet able to act as an intense light source. Light sources of this type have wide ranging applications, including use as micro-sensors in NSOM. Micro-sensor light sources have excellent detection limits as well as photo stability, reversibility, and millisecond response times. Furthermore, a method for manufacturing a micro optical fiber light source is provided. It involves the photo-chemical attachment of an optically active material onto the end surface of an optical fiber cable which has been pulled to form an end with an extremely narrow aperture. More specifically, photopolymerization has been applied as a means to photo-chemically attach an optically active material. This process allows significant control of the size of the micro light source. Furthermore, photo-chemically attaching an optically active material enables the implementation of the micro-light source in a variety of sensor applications.

Kopelman, Raoul (Ann Arbor, MI); Tan, Weihong (Ann Arbor, MI); Shi, Zhong-You (Ann Arbor, MI)

1994-01-01T23:59:59.000Z

257

Micro optical fiber light source and sensor and method of fabrication thereof  

DOE Patents [OSTI]

This invention relates generally to the development of and a method of fabricating a fiber optic micro-light source and sensor. An optical fiber micro-light source is presented whose aperture is extremely small yet able to act as an intense light source. Light sources of this type have wide ranging applications, including use as micro-sensors in NSOM. Micro-sensor light sources have excellent detection limits as well as photo stability, reversibility, and millisecond response times. Furthermore, a method for manufacturing a micro optical fiber light source is provided. It involves the photo-chemical attachment of an optically active material onto the end surface of an optical fiber cable which has been pulled to form an end with an extremely narrow aperture. More specifically, photopolymerization has been applied as a means to photo-chemically attach an optically active material. This process allows significant control of the size of the micro light source. Furthermore, photo-chemically attaching an optically active material enables the implementation of the micro-light source in a variety of sensor applications. 10 figs.

Kopelman, R.; Tan, W.; Shi, Z.Y.

1997-05-06T23:59:59.000Z

258

Effects of sea water environment on Glass Fiber Reinforced Plastic materials used for marine civil engineering constructions  

Science Journals Connector (OSTI)

Abstract Glass fiber composites (GFRP) are common in civil engineering projects, but not in marine structures. One reason is that seawater effects degrade GFRP composites mechanical properties and interlaminar shear strength (ILSS). Here, influence of seawater environment is studied to determine the best composite materials for marine civil engineer applications, studying the influence of several factors in their mechanical properties. This is to determine safety factors to use in the design of structural calculations for marine applications. Glass/Epoxy composites are the safest materials to use in marine civil structures as mechanical properties degradation becomes stabilized after moisture saturation level. UV and water cyclic analysis must be done to determine affection to transversal strength. Only vinylester GFRP has problems with biodegradation. GFRP fatigue performance is not influenced by seawater environment.

J.D. Garcia-Espinel; D. Castro-Fresno; P. Parbole Gayo; F. Ballester-Muńoz

2014-01-01T23:59:59.000Z

259

Mode tuning of quantum cascade lasers through optical processing of chalcogenide glass claddings  

E-Print Network [OSTI]

. The nature of gas-sensing applications requires single- mode operation and good tunability. One wayMode tuning of quantum cascade lasers through optical processing of chalcogenide glass claddings July 2006 In this letter, we demonstrate a method of tuning quantum cascade QC lasers by modifying

Arnold, Craig B.

260

The onset of optical breakdown in KrF-laser-irradiated silica glass surfaces  

E-Print Network [OSTI]

A synthetic fused silica obtained from Tosoh SGM Co., ESL-1000 (OH % 1200 wt. ppm), with a thick- ness of 2 mmThe onset of optical breakdown in KrF-laser-irradiated silica glass surfaces Y. Kawaguchia,* , A Research Center, National Institute of Advanced Industrial Science and Technology, Tsukuba Central 5, 1

Dickinson, J. Thomas

Note: This page contains sample records for the topic "optical glass fibers" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

Fast Pump-Power-Independent Brillouin Fiber Optic Sensor  

Science Journals Connector (OSTI)

A fast and distributed Brillouin sensor, which is immune to pump power variations is presented. 120Hz strain vibrations are measured over 50m fiber with >1kHz sampling rate,...

Motil, Avi; Danon, Orr; Peled, Yair; Tur, Moshe

262

Optical fiber-based single-shot picosecond TA spectroscopyL  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

fiber-based single-shot picosecond transient absorption fiber-based single-shot picosecond transient absorption spectroscopy Andrew R. Cook and Yuzhen Shen Rev. Sci. Inst. 80, 073106 (2009). [Find paper at Scitation] Copyright 2009 American Institute of Physics. This article may be downloaded (here) for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The article appeared in Rev. Sci. Inst. 80, 073106 (2009) and may be found at http://link.aip.org/link/?RSI/80/073106 or http://dx.doi.org/10.1063/1.3156048. Abstract: A new type of single-shot transient absorption apparatus is described based on a bundle of optical fibers. The bundle contains 100 fibers of different lengths, each successively giving ~15 ps longer optical delay. Data are collected by imaging light from the exit of the bundle into

263

High upconversion optical gain of Er3+-doped tellurite glass  

Science Journals Connector (OSTI)

Short-wavelength lasers (SWLs) have wide applications in high-density optical storage, laser-induced nuclear fusion, laser projection television, laser radar and so on [1–5]. The short wavelength lasing output ca...

S. B. Fu; B. J. Chen; J. S. Zhang; X. P. Li; H. Zhong; B. N. Tian…

2014-06-01T23:59:59.000Z

264

Fiber optic sensor employing successively destroyed coupled points or reflectors for detecting shock wave speed and damage location  

DOE Patents [OSTI]

A shock velocity and damage location sensor providing a means of measuring shock speed and damage location. The sensor consists of a long series of time-of-arrival "points" constructed with fiber optics. The fiber optic sensor apparatus measures shock velocity as the fiber sensor is progressively crushed as a shock wave proceeds in a direction along the fiber. The light received by a receiving means changes as time-of-arrival points are destroyed as the sensor is disturbed by the shock. The sensor may comprise a transmitting fiber bent into a series of loops and fused to a receiving fiber at various places, time-of-arrival points, along the receiving fibers length. At the "points" of contact, where a portion of the light leaves the transmitting fiber and enters the receiving fiber, the loops would be required to allow the light to travel backwards through the receiving fiber toward a receiving means. The sensor may also comprise a single optical fiber wherein the time-of-arrival points are comprised of reflection planes distributed along the fibers length. In this configuration, as the shock front proceeds along the fiber it destroys one reflector after another. The output received by a receiving means from this sensor may be a series of downward steps produced as the shock wave destroys one time-of-arrival point after another, or a nonsequential pattern of steps in the event time-of-arrival points are destroyed at any point along the sensor.

Weiss, Jonathan D. (Albuquerque, NM)

1995-01-01T23:59:59.000Z

265

Optical properties of lanthanide-containing halide-modified zinc tellurite glasses  

SciTech Connect (OSTI)

As part of an ongoing investigation to characterize the properties and structure of Zn halide-Te oxide glasses, we report preliminary measurements of the optical properties of several Nd- and Er-doped tellurites. Measurements include fluorescence lifetimes and estimates of the theoretical radiative lifetimes (from traditional Judd-Ofelt analysis of optical absorption spectra) as well as phonon sideband studies sensitive to vibrational characteristics near the rare earth ion. Response of these optical features to the substitution of alternative halides is examined.

Sidebottom, D.L.; Hruschka, M.A. [New Mexico Univ., Albuquerque, NM (United States); Potter, B.G.; Brow, R.K.; Hudgens, J.J. [Sandia National Labs., Albuquerque, NM (United States)

1996-12-31T23:59:59.000Z

266

Experimental verification of a model describing the intensity distribution from a single mode optical fiber  

SciTech Connect (OSTI)

The intensity distribution of a transmission from a single mode optical fiber is often approximated using a Gaussian-shaped curve. While this approximation is useful for some applications such as fiber alignment, it does not accurately describe transmission behavior off the axis of propagation. In this paper, another model is presented, which describes the intensity distribution of the transmission from a single mode optical fiber. A simple experimental setup is used to verify the model's accuracy, and agreement between model and experiment is established both on and off the axis of propagation. Displacement sensor designs based on the extrinsic optical lever architecture are presented. The behavior of the transmission off the axis of propagation dictates the performance of sensor architectures where large lateral offsets (25-1500 {micro}m) exist between transmitting and receiving fibers. The practical implications of modeling accuracy over this lateral offset region are discussed as they relate to the development of high-performance intensity modulated optical displacement sensors. In particular, the sensitivity, linearity, resolution, and displacement range of a sensor are functions of the relative positioning of the sensor's transmitting and receiving fibers. Sensor architectures with high combinations of sensitivity and displacement range are discussed. It is concluded that the utility of the accurate model is in its predicative capability and that this research could lead to an improved methodology for high-performance sensor design.

Moro, Erik A [Los Alamos National Laboratory; Puckett, Anthony D [Los Alamos National Laboratory; Todd, Michael D [UCSD

2011-01-24T23:59:59.000Z

267

In-situ backplane inspection of fiber optic ferrules  

E-Print Network [OSTI]

The next generation of supercomputers, routers, and switches are envisioned to have hundreds and thousands of optical interconnects among components. An optical interconnect attains a bandwidth-distance product as high as ...

Wilson, Andrew Kirk, 1977-

2006-01-01T23:59:59.000Z

268

Gamma Radiation Effects on Physical, Optical, and Structural Properties of Binary As-S glasses  

SciTech Connect (OSTI)

Gamma radiation induces changes in physical, optical, and structural properties in chalcogenide glasses., Previous research has focused on As{sub 2}S{sub 3} and families of glasses containing Ge. For the first time, we present composition and dose dependent data on the As-S binary glass series. Binary As{sub x}S{sub 100-x} (x = 30, 33, 36, 40, and 42) glasses were irradiated with gamma radiation using a {sup 60}Co source at 2.8 Gy/s to accumulated doses of 1, 2, 3, and 4 MGy. The irradiated samples were characterized at each dose level for density, refractive index, x-ray diffraction, and Raman spectrum. These results are compared to those of as-made and 1 year aged samples. We report an initial increase in density followed by a decrease as a function of dose that contradicts the expected compositional dependence of molar volume of these glasses. This unusual behavior is explained based on microvoid formation and nanoscale phase-separation induced by the irradiation in these glasses. XRD, Raman, and EPR data provide supporting evidence, underscoring the importance of optimally- or overly-constrained structures for stability under aging or irradiation.

Sundaram, S. K.; McCloy, John S.; Riley, Brian J.; Murphy, Mark K.; Qiao, Hong (Amy) [Amy; Windisch, Charles F.; Walter, Eric D.; Crum, Jarrod V.; Golovchak, Roman; Shpotyuk, O.

2012-03-01T23:59:59.000Z

269

Structural origin of the nonlinear optical properties of lead niobium germanate film glasses  

SciTech Connect (OSTI)

The structural origin of the nonlinear optical susceptibility (/{chi}{sup (3)}/) of lead-niobium-germanate film glasses with large Nb{sub 2}O{sub 5} contents has been investigated. /{chi}{sup (3)}/ shows a strong enhancement with the Nb content in the films with /{chi}{sup (3)}/ values close to 2 x 10{sup -11} esu at 800 nm for a Nb content as high as 0.71. Boling-Glass-Owyoung and Lines' semiempirical models predict accurately the values of /{chi}{sup (3)}/ for transparent bulk glasses but not for film glasses. This discrepancy is related to the remarkable structural differences between them. Raman spectroscopy suggests the formation of a three-dimensional (3D) structure of [NbO{sub 6}] octahedra in the case of film glasses having large Nb contents, while X-ray photoelectron spectroscopy shows that a significant fraction of these units contain Nb{sup 4+} ions. The combination of a 3D structure of [NbO{sub 6}] with the presence of Nb{sup 4+} polarons and their migration through electron intervalence transfer is proposed as the origin of the observed enhancement of /{chi}{sup (3)}/ in the film glasses.

Munoz-Martin, D.; Ruiz de La Cruz, A.; Fernandez-Navarro, J. M.; Solis, J.; Gonzalo, J. [Laser Processing Group, Instituto de Optica (CSIC), Serrano 121, 28006 Madrid (Spain); Domingo, C. [Instituto de Estructura de la Materia (CSIC), Serrano 121, 28006 Madrid (Spain)

2011-07-15T23:59:59.000Z

270

Performance characterization of an internsity-modulated fiber optic displacement sensor  

SciTech Connect (OSTI)

A testbed simulating an intensity-modulated fiber optic displacement sensor is experimentally characterized, and the implications regarding sensor design are discussed. Of interest are the intensity distribution of the transmitted optical signal and the relationships between sensor architecture and performance. Particularly, an intensity-modulated sensor's sensitivity, linearity, displacement range, and resolution are functions of the relative positioning of its transmitting and receiving fibers. In this paper, sensor architectures with various combinations of these performance metrics are discussed. A sensor capable of micrometer resolution is reported, and it is concluded that this work could lead to an improved methodology for sensor design.

Moro, Erik Allan [Los Alamos National Laboratory; Todd, Michael D [Los Alamos National Laboratory; Puckett, Santhony D [Los Alamos National Laboratory

2010-09-30T23:59:59.000Z

271

Fiber-Optics Implementation of the Deutsch-Jozsa and Bernstein-Vazirani Quantum Algorithms with Three Qubits  

E-Print Network [OSTI]

Fiber-Optics Implementation of the Deutsch-Jozsa and Bernstein-Vazirani Quantum Algorithms; published 16 April 2003) We report on a fiber-optics implementation of the Deutsch-Jozsa and Bernstein will be interested in here is Deutsch's algorithm [3], the first quantum algorithm ever discovered, which was later

Cerf, Nicolas

272

The University of Texas at Austin September 30, 2011 Communications Optical Fiber Backbone Cabling 27 13 23-1  

E-Print Network [OSTI]

, as required by law: 1. National Electric Code (NEC) 2. ANSI/IEEE C2 ­ National Electrical Safety Code C. ANSI/TIA-568-C.0, Generic Telecommunications Cabling for Customer Premises 3. ANSI/TIA-568-C.3, Optical Fiber Cabling Components Standard. 4. ANSI/TIA/EIA-604-10A, FOCIS 10, Fiber Optic Connector

Dawson, Clint N.

273

Fiber Optical Micro-detectors for Oxygen Sensing in Power Plants  

SciTech Connect (OSTI)

A reflection mode fiber optic oxygen sensor that can operate at high temperatures for power plant applications is being developed. The sensor is based on the {sup 3}O{sub 2} quenching of the red emission from hexanuclear molybdenum chloride clusters. Previously we described a particle-in-binder approach to immobilizing the potassium salt of a molybdenum cluster, K{sub 2}Mo{sub 6}Cl{sub 14}, at the tips of optical fibers. Compared to previous methods, the particle-in-binder approach affords fibers with greatly improved mechanical properties. We have extensively characterized two fiber sensors at high temperature. We obtain quenching ratios between pure nitrogen and 21% oxygen as high as 3.9 x at 70 C. For the first sensor at 60 C we obtained a {+-} 1% variation in the quenching ratio over 6 cycles of measurement, and monitored the device performance over 23 days. We were able to operate the second sensor continuously for 14 hours at 70 C, and the sensor quenching ratio was stable to 5% over that time period. These are promising results for a high temperature fiber optical oxygen sensor based on molybdenum chloride clusters.

Gregory L. Baker; Ruby N. Ghosh; D.J. Osborn III; Po Zhang

2006-01-01T23:59:59.000Z

274

High-Q Hybrid Plasmon-Photon Modes in a Bottle Resonator Realized with a Silver-Coated Glass Fiber with a Varying Diameter  

Science Journals Connector (OSTI)

We experimentally demonstrate that hybrid plasmon-photon modes exist in a silver-coated glass bottle resonator. The bottle resonator is realized in a glass fiber with a smoothly varying diameter, which is subsequently coated with a rhodamine 800-dye doped acryl-glass layer and a 30 nm thick silver layer. We show by means of photoluminescence experiments supported by electromagnetic simulations that the rhodamine 800 photoluminescence excites hybrid plasmon-photon modes in such a bottle resonator, which provide a plasmon-type field enhancement at the outer silver surface and exhibit quality factors as high as 1000.

Andreas Rottler; Malte Harland; Markus Bröll; Matthias Klingbeil; Jens Ehlermann; Stefan Mendach

2013-12-18T23:59:59.000Z

275

High frequency current sensors using the Faraday effect in optical fibers  

SciTech Connect (OSTI)

This study investigates the high frequency response of Faraday effect optical fiber current sensors that are bandwidth-limited by the transit time of the light in the fiber. Mathematical models were developed for several configurations of planar (collocated turns) and travelling wave (helical turns) singlemode fiber sensor coils, and experimental measurements verified the model predictions. High frequency operation above 500 MHz, with good sensitivity, was demonstrated for several current sensors; this frequency region was not previously considered accessible by fiber devices. Planar fiber coils in three configurations were investigated: circular cross section with the conductor centered coaxially; circular cross section with the conductor noncentered; and noncircular cross section with arbitrary location of the conductor. The helical travelling wave fiber coils were immersed in the dielectric of a coaxial transmission line to improve velocity phase matching between the field and light. Three liquids (propanol, methanol, and water) and air were used as transmission line dielectric. Complete models, which must account for liquid dispersion and waveguide dispersion from the multilayer dielectric in the transmission line, were developed to describe the Faraday response of the travelling wave sensors. Other travelling wave current sensors with potentially greater Faraday sensitivity, wider bandwidth and smaller size are investigated using the theoretical models developed for the singlemode fibers coils.

Cernosek, R.W. [Sandia National Labs., Albuquerque, NM (United States). Microsensor Research and Development Dept.] [Sandia National Labs., Albuquerque, NM (United States). Microsensor Research and Development Dept.

1994-09-01T23:59:59.000Z

276

New Energy-Saving Fiber Optic Lighting System Lights Up Public Spaces  

Broader source: Energy.gov (indexed) [DOE]

Energy Focus to develop a Energy Focus to develop a breakthrough lighting technology that delivers light comparable to conventional lamps while using significantly less energy per lumen, reducing watts per square foot without sacrificing light levels. As a result of DOE SBIR and other government funding, EFO (efficient fiber optics) Lighting Systems can deliver as much as 80% energy savings over halogen or

277

The fatigue of high-strength fused silica optical fibers in low humidity q  

E-Print Network [OSTI]

the effect of humidity on the kinetics of subcritical crack growth in high strength optical fibers that the rate of subcritical crack growth is given by dc dt ÂĽ A exp n KI KIC ; Ă°1Ă? where A and n are fatigue by assuming a simple chemical kinetics model for fatigue in which the reaction rate between water and silica

Matthewson, M. John

278

CHEMICAL KINETICS MODELS FOR THE FATIGUE BEHAVIOR OF FUSED SILICA OPTICAL FIBER  

E-Print Network [OSTI]

of stress, temperature and activity of the corroding species (e.g. water). A power law degradation kinetics the degradation depends on the applied stress. Subcritical Crack Growth Model The reliability of silica optical fiber under stress is usually described by the subcritical crack growth model. It is assumed

Matthewson, M. John

279

An experimental investigation of the sensitivity of a buried fiber optic intrusion sensor  

E-Print Network [OSTI]

A distributed fiber optic sensor with the ability of detecting and locating intruders on foot and vehicles over long perimeters (>10 km) was studied. The response of the sensor to people walking over or near it and to vehicles driving nearby...

Kuppuswamy, Harini

2006-04-12T23:59:59.000Z

280

Fort Meade demonstration test LEDS in freezer rooms, fiber optics in display cases  

SciTech Connect (OSTI)

Demonstration projects at Fort George G. Meade, MD, substituted LED lighting for incandescent bulbs in commisary wal-in freezers and fiber optic lighting in reach-in display cases. The goal was to reduce energy consumption and the results were positive. Journal article published in Public Works Digest

Parker, Steven; Parker, Graham B.

2008-10-25T23:59:59.000Z

Note: This page contains sample records for the topic "optical glass fibers" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

Optical Home Network based on an NxN Multimode Fiber Architecture and CWDM Technology  

E-Print Network [OSTI]

it will be installed in the walls of a house for decades. This concept has already been applied to singlemode fiber. A passive N x N architecture for a WDM HN Today, most HN solutions are centered on a switch in an active. The best alternative is then a passive optical plant centered on an NxN splitter, as depicted in figure 1

Paris-Sud XI, Université de

282

Studies on Mechanical Properties, Thermal Degradation, and Combustion Behaviors of Poly(1,4-butylene terephthalate)/Glass Fiber/Cerium Hypophosphite Composites  

Science Journals Connector (OSTI)

For the GRPBT composite with 15 wt % of CHP, the storage modulus value at 30 °C was 3 times that of GRPBT. ... Yang, W.; Hu, Y.; Tai, Q. L.; Lu, H. D.; Song, L.; Yuen, R. K. K.Fire and mechanical performance of nanoclay reinforced glass-fiber/PBT composites containing aluminum hypophosphite particles Composites, Part A 2011, 42, 794– 800 ...

Wei Yang; Ningning Hong; Lei Song; Yuan Hu; Richard K. K. Yuen; Xinglong Gong

2012-06-04T23:59:59.000Z

283

Sensitivity analysis and model for fiber optic gyroscope  

E-Print Network [OSTI]

the error is represented, the Rayleigh backscattering error can be reduced by using a spectrally broad optical source, such as a superluminescent diode (SLD) (18). Increasing the spectral linewidth A1, of the light source will decrease the Rayleigh...

Vandervort, Annette Louise

1990-01-01T23:59:59.000Z

284

Fiber Optic Sensing Technology for Detecting Gas Hydrate Formation and Decomposition  

SciTech Connect (OSTI)

A fiber optic-based distributed sensing system (DSS) has been integrated with a large volume (72 L) pressure vessel providing high spatial resolution, time resolved, 3-D measurement of hybrid temperature-strain (TS) values within experimental sediment gas hydrate systems. Areas of gas hydrate formation (exothermic) and decomposition (endothermic) can be characterized through this proxy by time series analysis of discrete data points collected along the length of optical fibers placed within a sediment system. Data is visualized as a 'movie' of TS values along the length of each fiber over time. Experiments conducted in the Seafloor Processing Simulator (SPS) at Oak Ridge National Laboratory show clear indications of hydrate formation and dissociation events at expected P-T conditions given the thermodynamics of the CH4-H2O system. The high spatial resolution achieved with fiber optic technology makes the DSS a useful tool for visualizing time resolved formation and dissociation of gas hydrates in large-scale sediment experiments.

Rawn, Claudia J [ORNL; Leeman, John R [University of Oklahoma, Norman; Ulrich, Shannon M [ORNL; Alford, Jonathan E [ORNL; Phelps, Tommy Joe [ORNL; Madden, Megan Elwood [University of Oklahoma, Norman

2011-01-01T23:59:59.000Z

285

Experimental investigations of an all-fiber multireflector spectral filter for optical communications  

E-Print Network [OSTI]

spatially periodic refractive index variation in the fiber. The reflectance spectrum of the FBG filter is characterized by a single narrow peak with side lobes, and thus can be used as a bandpass filter [2]. The two mirror Fiber Fabry... in frequency is known as the free spectral range FSR . Practical two mirror FFPI filters make use of a cavity formed by an air gap between two dielectric mirrors [5,6]. An ideal spectral filter for optical communication would have flat in- band...

Lee, Jong-Seo

2004-09-30T23:59:59.000Z

286

Measurement of Thermal Conductivity of PbTe Nanocrystal Coated Glass Fibers by the 3 Method  

E-Print Network [OSTI]

and high aspect ratio result in a significant thermal radiation effect. We simulate the experiment using such as automobile exhaust pipes, power plant steam pipes, manufacturing industry cooling pipes, and so forth. Our the radiation effect and extract the thermal conductivity at the single fiber level. Our simulation method

Ruan, Xiulin

287

Currently, there is a substantial research and development effort directed toward optical signal processing and electronic signal processing for fiber-optic communications. Much of the work  

E-Print Network [OSTI]

Abstract Currently, there is a substantial research and development effort directed toward optical signal processing and electronic signal processing for fiber-optic communications. Much of the work for telecommunication services. For optical signal proc- essing, a variety of approaches are available for implementing

Wu, Shin-Tson

288

1888 OPTICS LETTERS / Vol. 28, No. 20 / October 15, 2003 Efficient single-mode Brillouin fiber laser for low-noise optical  

E-Print Network [OSTI]

1888 OPTICS LETTERS / Vol. 28, No. 20 / October 15, 2003 Efficient single-mode Brillouin fiber laser for low-noise optical carrier reduction of microwave signals S. Norcia, S. Tonda-Goldstein, D 503, 91403 Orsay cedex, France Received April 22, 2003 We experimentally demonstrate efficient optical

Paris-Sud XI, Université de

289

Stimulated Raman scattering in an ethanol core microstructured optical fiber  

E-Print Network [OSTI]

Delaye, Anne Rouvie, Jordi Chinaud, Robert Frey, Gérald Roosen Laboratoire Charles Fabry de l'Institut d" Phys. Rev. Lett. 9, 455 (1962) 2. Y.R. Shen "The principles of nonlinear optics" (John Wiley and Sons, New York, 1994). 4. R.Frey, F. Pradère "Powerful tunable infrared generation by stimulated Raman

Paris-Sud XI, Université de

290

Energy losses in thermally cycled optical fibers constrained in small bend radii  

SciTech Connect (OSTI)

High energy laser pulses were fired into a 365?m diameter fiber optic cable constrained in small radii of curvature bends, resulting in a catastrophic failure. Q-switched laser pulses from a flashlamp pumped, Nd:YAG laser were injected into the cables, and the spatial intensity profile at the exit face of the fiber was observed using an infrared camera. The transmission of the radiation through the tight radii resulted in an asymmetric intensity profile with one half of the fiber core having a higher peak-to-average energy distribution. Prior to testing, the cables were thermally conditioned while constrained in the small radii of curvature bends. Single-bend, double-bend, and U-shaped eometries were tested to characterize various cable routing scenarios.

Guild, Eric; Morelli, Gregg

2012-09-23T23:59:59.000Z

291

Supporting Information Scalable Air Cathode Microbial Fuel Cells Using Glass Fiber Separators, Plastic Mesh  

E-Print Network [OSTI]

, Plastic Mesh Supporters, and Graphite Fiber Brush Anodes Xiaoyuan Zhang a , Shaoan Cheng b, c , Peng Liang (mW/m2 ) Reference Single brush Single Without plastic mesh or GF1 12 9.5±0.2 68±1 1160±21 This study Single brush Single Without plastic mesh, with GF1 12 11.8±2.1 74±4 1277±80 This study Single brush

292

Fabrication of Optical Fiber Mechanical Shock Sensors for the Los Alamos HERT (High Explosive Radio Telemetry) Project  

SciTech Connect (OSTI)

This document lists the requirements for the fiber optic mechanical shock sensor for the Los Alamos HERT (High Explosive Radio Telemetry) project and provides detailed process steps for fabricating, testing, and assembling the fiber shock sensors for delivery to Los Alamos.

P. E. Klingsporn

2005-11-14T23:59:59.000Z

293

One-dimensional single-mode fiber-optic displacement sensors for submillimeter measurements  

SciTech Connect (OSTI)

We demonstrate the working principle of a one-dimensional intensity-based fiber-optic displacement sensor. The sensor consists of one receiving fiber, which is moved laterally in the optical field emitted by an emitting fiber. It is shown numerically that the sensor response is highly linear (nonlinearity error of 0.1 to 2%) for a wide range of travel (2.24 to 860 {mu}m). The sensor response is also simulated experimentally using a highly precise robot, the results of which correspond very closely to numerical ones. Linearity, travel, and sensitivity are experimentally determined for different gaps between the emitting and the receiving fibers (10 {mu}m to 10 mm). A design chart that includes the nonlinearity error (0.5% to 2%), the travel (2.78 to 860 {mu}m), the sensitivity (0.032 to 0.37 dB/{mu}m), and the gap distance (1 to 10 mm) is finally proposed.

Trudel, Vincent; St-Amant, Yves

2009-09-10T23:59:59.000Z

294

An ethanol vapor detection probe based on a ZnO nanorod coated optical fiber long period grating  

Science Journals Connector (OSTI)

A new ethanol vapor detection probe based on an optical fiber long period grating overlaid with a zinc oxide (ZnO) nanorods layer is presented. The ZnO nanorod layer was developed onto...

Konstantaki, Maria; Klini, Argyro; Anglos, Demetrios; Pissadakis, Stavros

2012-01-01T23:59:59.000Z

295

Cancellation of four-wave mixing in a single-mode fiber by midway optical phase conjugation  

Science Journals Connector (OSTI)

Cancellation of waves generated by four-wave mixing (FWM) in a single-mode fiber by use of midway optical phase conjugation is proposed and analyzed, and the possible power reduction...

Watanabe, Shigeki

1994-01-01T23:59:59.000Z

296

Doppler Effect in Flexible and Expandable Light Waveguide and Development of New Fiber-Optic Vibration/Acoustic Sensor  

Science Journals Connector (OSTI)

New principle and a geometrical arrangement of an optical fiber for a vibration/acoustic measurement are proposed in the present paper. The sensor is based on a new finding that a...

Kageyama, Kazuro; Murayama, Hideaki; Uzawa, Kiyoshi; Ohsawa, Isamu; Kanai, Makoto; Akematsu, Yoshiaki; Nagata, Keiich; Ogawa, Tetsu

2006-01-01T23:59:59.000Z

297

Observations of Transport Variability in the Baltic Sea by Parasitic Use of a Fiber-Optic Cable  

Science Journals Connector (OSTI)

Transports between the Swedish mainland and the island of Gotland were studied by means of motionally induced voltages. The copper mantle of an existent fiber-optic telecommunications cable was grounded on Gotland, and the data acquisition system ...

Peter Sigray; Peter Lundberg; Kristofer Döös

2004-07-01T23:59:59.000Z

298

Characterization of Single-mode Chalcogenide Optical Fiber for Mid-Infrared Applications  

SciTech Connect (OSTI)

Chalcogenide fibers display a wide transmission window ranging from 2-10.6 ?m, ideally suited to the development of passive and active mid-infrared (MIR) sensors. They are essential building blocks for the integration and miniaturization of laser-based MIR optical systems for terrestrial, airborne and space-based sensing platforms. Single-mode chalcogenide fibers have only recently become commercially available and therefore performance data and standard reproducible processing techniques have not been widely reported. In this paper we present a method for producing high quality facets on commercial single-mode As-Se fibers with core and cladding diameters of 28.1 and 169.9?m respectively. The emitted beam profile from these fibers, using the 9.4?m line of a tunable CO2 laser, showed the presence of leaky cladding modes due to waveguiding conditions created by the protective acrylate jacket. These undesirable cladding modes were easily suppressed by applying a gallium coating on the cladding near both input and output facets. We provide experimental data of efficient mode suppression and the emission of a circular near-perfect Gaussian beam profile from the fiber. A model to determine appropriate placement of gallium coatings to minimize processing while maximizing cladding mode suppression is currently underway. Furthermore, analyses of the beam, acquired by scanning an HgCdTe detector, yielded a 1/e2 numerical aperture of 0.11 with a full width half maximum divergence of 11° for these fibers. The availability of single-mode MIR fibers, in conjunction with recent advances in room temperature quantum cascade lasers (QCL), could provide compact and light-weight transmitter solutions for several critical defense and nuclear non-proliferation needs.

Krishnaswami, Kannan; Qiao, Hong (Amy); Bernacki, Bruce E.; Anheier, Norman C.

2009-04-01T23:59:59.000Z

299

Fiber Optic Cryogenic Sensors for Superconducting Magnets and Superconducting Power Transmission lines at CERN  

E-Print Network [OSTI]

The design, fabrication and tests of a new generation of superconducting magnets for the upgrade of the LHC require the support of an adequate, robust and reliable sensing technology. The use of Fiber Optic Sensors is becoming particularly challenging for applications in extreme harsh environments such as ultra-low temperatures, high electromagnetic fields and strong mechanical stresses offering perspectives for the development of technological innovations in several applied disciplines.

Chiuchiolo, A; Cusano, A; Bajko, M; Perez, J C; Bajas, H; Giordano, M; Breglio, G; Palmieri, L

2014-01-01T23:59:59.000Z

300

Correspondence between the NLS equation for optical fibers and a class of integrable NLS equations  

E-Print Network [OSTI]

The propagation of the optical field complex envelope in a single-mode fiber is governed by a one-dimensional cubic nonlinear Schr\\"odinger equation with a loss term. We present a result about $L^2$-closeness of the solutions of the above-mentioned equation and of a one-dimensional nonlinear Schr\\"odinger equation that is Painlev\\'e integrable.

Domenico Felice; Luigi Barletti

2014-02-05T23:59:59.000Z

Note: This page contains sample records for the topic "optical glass fibers" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Method and apparatus for monitoring and measuring the surface tension of a fluid using fiber optics  

DOE Patents [OSTI]

A non-contact method and apparatus are described for measuring and monitoring the surface of a fluid using fiber optics and interferometric detection to permit measurement of mechanical characteristics of fluid surfaces. The apparatus employs an alternating electric field gradient for generating a capillary wave on the surface of the fluid. A fiber optic coupler and optical fiber directs a portion of a laser beam onto the surface of the fluid, another portion of the laser beam onto the photo sensor, and directs light reflected from the surface of the fluid onto the photo sensor. The output of the photo sensor is processed and coupled to a phase sensitive detector to permit measurement of phase shift between the drive signal creating the capillary wave and the detected signal. This phase shift information is then used to determine mechanical properties of the fluid surface such as surface tension, surface elasticity, and surface inhomogeneity. The resulting test structure is easily made compact, portable, and easy to align and use. 4 figures.

Abraham, B.M.; Ketterson, J.B.; Bohanon, T.M.; Mikrut, J.M.

1994-04-12T23:59:59.000Z

302

Tensile fatigue behavior of tapered glass fiber reinforced epoxy composites containing nanoclay  

Science Journals Connector (OSTI)

Abstract Tensile fatigue behavior of tapered glass/epoxy laminates is investigated. The effect of nanoclay addition into the epoxy resin is examined. It is shown that the relative orientation between the adjacent belt layer and the cut layer has important influence on the fatigue life. The fatigue crack starts at the resin pocket and propagates along the interface between the belt layer and the core layer in the thicker section of the laminate. Crack propagation is mainly due to mode II crack failure. The addition of the clays enhances the resistance against this mode II crack propagation, and thus prolongs the fatigue life of the laminate.

S. Helmy; S.V. Hoa

2014-01-01T23:59:59.000Z

303

Thermal lens study of thermo-optical properties and concentration quenching of Er3+-doped lead pyrophosphate based glasses  

SciTech Connect (OSTI)

In this work, we have used the thermal lens technique combined with conventional spectroscopy to characterize the thermo-optical properties of Er3+-doped lead pyrophosphate-based glasses. More precisely, we have investigated and quantified experimentally the fluorescence quantum efficiencies of the Er3+ levels, and we describe the role of concentration quenching effects. The fluorescence quantum efficiency of the 4I13/2 level is very high when compared to other phosphate glasses, while that of the green-coupled levels is very small. Other important photonic materials parameters, such as the thermal diffusivity and temperature coefficient of the optical path length change, were obtained and compared with those of other glass systems. The cumulative results obtained here for the Er-doped lead pyrophosphate glass show that this material is a good candidate for photonic applications with a characteristic Er3+ infrared emission around 1550 nm.

Santos, C. C. [Universidade Federal do Ceara, Ceara, Brazil; Rocha, U. [Grupo de Fotônica e Fluidos Complexos, Instituto de Física, Brazil; Guedes, Ilde [Universidade Federal do Ceara, Ceara, Brazil; Vermelho, M. V. D. [Instituto de Fisica, Universidade Federal de Alagoas, Brazil; Boatner, Lynn A [ORNL; Jacinto, C. [Instituto de Fisica, Universidade Federal de Alagoas, Brazil

2012-01-01T23:59:59.000Z

304

Effect of variable valence impurities on the formation of bismuth-related optical centres in a silicate glass  

SciTech Connect (OSTI)

We have studied the effect of variable valence impurities (cerium and iron) on the formation of bismuth-related IR luminescence centres and the optical loss between 1000 and 1300 nm in a magnesium aluminosilicate glass. The results demonstrate that additional doping of the glass with ceria leads to effective bleaching in a wide spectral range, including the luminescence range of the bismuth centres. At the same time, ceria reduces the concentration of luminescence centres. Gamma irradiation of the glass bleached by cerium restores the luminescence centres but leads to a background loss in a wide spectral range. Iron is shown to be a very harmful impurity in bismuth-doped active media: even trace levels of iron prevent the formation of bismuth-related active centres in the glass and produce a strong, broad absorption band centred near 1 {mu}m. (luminescence of glasses)

Galagan, B I; Denker, B I; Lili Hu; Sverchkov, S E; Shulman, I L; Dianov, Evgenii M

2012-10-31T23:59:59.000Z

305

Theoretical and Experimental Thermal Performance Analysis of Building Shell Components Containing Blown Fiber Glass Insulation Enhanced with Phase Change Material (PCM)  

SciTech Connect (OSTI)

Different types of Phase Change Materials (PCMs) have been tested as dynamic components in buildings during the last 4 decades. Most historical studies have found that PCMs enhance building energy performance. Some PCM-enhanced building materials, like PCM-gypsum boards or PCM-impregnated concretes have already found their limited applications in different countries. Today, continued improvements in building envelope technologies suggest that throughout Southern and Central US climates, residences may soon be routinely constructed with PCM in order to maximize insulation effectiveness and maintain low heating and cooling loads. The proposed paper presents experimental and numerical results from thermal performance studies. These studies focus on blown fiber glass insulation modified with a novel spray-applied microencapsulated PCM. Experimental results are reported for both laboratory-scale and full-size building elements tested in the field. In order to confirm theoretical predictions, PCM enhanced fiber glass insulation was evaluated in a guarded hot box facility to demonstrate heat flow reductions when one side of a test wall is subjected to a temperature increase. The laboratory work showed reductions in heat flow of 30% due to the presence of approximately 20 wt % PCM in the insulation. Field testing of residential attics insulated with blown fiber glass and PCM was completed in Oak Ridge, Tennessee. Experimental work was followed by detailed whole building EnergyPlus simulations in order to generate energy performance data for different US climates. In addition, a series of numerical simulations and field experiments demonstrated a potential for application of a novel PCM fiber glass insulation as enabling technology to be utilized during the attic thermal renovations.

Miller, William A [ORNL] [ORNL; Kosny, Jan [ORNL] [ORNL; Yarbrough, David W [ORNL] [ORNL; Childs, Phillip W [ORNL] [ORNL; Shrestha, Som S [ORNL] [ORNL; Atchley, Jerald Allen [ORNL] [ORNL; Bianchi, Marcus V [ORNL] [ORNL; Smith, John B [ORNL] [ORNL; Fellinger, Thomas [ORNL] [ORNL; Kossecka, Elizabeth [Institute of Fundamental Technological Research, Polish Academy of Sciences] [Institute of Fundamental Technological Research, Polish Academy of Sciences; Lee, Edwin S [ORNL] [ORNL

2010-01-01T23:59:59.000Z

306

Long-gage optical fiber extensometers for dynamic evaluation of structures  

Science Journals Connector (OSTI)

This paper deals with the study of the capacity of continuously attached long-gage fiber optic sensors for a new use: dynamic evaluation of structures. The optical system is first presented, followed by the development of the precise formulation of the measurement data obtained by this sensor when applied to the dynamic analysis of beams, especially under bending oscillations. This sensor allows us to find the curvature mode shapes. Numerical simulations are then performed to estimate the dynamic characteristics of the beam by means of the continuous wavelet transform, using the data obtained with this sensor. Finally, the fiber optic sensors are bonded on a real cantilever beam and experimental data are collected from the optical measurement system, in the case of aftershock free oscillations of the instrumented beam. A similar modal identification procedure as that proposed for numerical simulations is used and the results are compared to those obtained with accelerometers and long strain gauges. This type of sensor, allowing us to find the curvature mode shapes, will be a good candidate for damage detection.

G. Cumunel; S. Delepine-Lesoille; P. Argoul

2012-01-01T23:59:59.000Z

307

Novel, fiber optic, hybrid pressure and temperature sensor designed for high-temperature gen-IV reactor applications  

SciTech Connect (OSTI)

A novel, fiber optic, hybrid pressure-temperature sensor is presented. The sensor is designed for reliable operation up to 1050 C, and is based on the high-temperature fiber optic sensors already demonstrated during previous work. The novelty of the sensors presented here lies in the fact that pressure and temperature are measured simultaneously with a single fiber and a single transducer. This hybrid approach will enable highly accurate active temperature compensation and sensor self-diagnostics not possible with other platforms. Hybrid pressure and temperature sensors were calibrated by varying both pressure and temperature. Implementing active temperature compensation resulted in a ten-fold reduction in the temperature-dependence of the pressure measurement. Sensors were also tested for operability in a relatively high neutron radiation environment up to 6.9x10{sup 17} n/cm{sup 2}. In addition to harsh environment survivability, fiber optic sensors offer a number of intrinsic advantages for nuclear power applications including small size, immunity to electromagnetic interference, self diagnostics / prognostics, and smart sensor capability. Deploying fiber optic sensors on future nuclear power plant designs would provide a substantial improvement in system health monitoring and safety instrumentation. Additional development is needed, however, before these advantages can be realized. This paper will highlight recent demonstrations of fiber optic sensors in environments relevant to emerging nuclear power plants. Successes and lessons learned will be highlighted. (authors)

Palmer, M. E.; Fielder, R. S.; Davis, M. A. [Luna Innovations, Incorporated, 2851 Commerce St., Blacksburg, VA 24060 (United States)

2006-07-01T23:59:59.000Z

308

IEEE PHOTONICS TECHNOLOGY LETTERS, VOL. 15, NO. 1, JANUARY 2003 81 Tunable Microfluidic Optical-Fiber Devices Based on  

E-Print Network [OSTI]

IEEE PHOTONICS TECHNOLOGY LETTERS, VOL. 15, NO. 1, JANUARY 2003 81 Tunable Microfluidic Optical. Krupenkine, K. Baldwin, and J. A. Rogers Abstract--This letter introduces a class of tunable microfluidic pressure pumping and thermo-optic tuning of microfluidic plugs in microstructured, or "holey," fiber yields

Rogers, John A.

309

Optical scattering noise in high Q fiber ring resonators and its effect on optoelectronic oscillator phase noise  

E-Print Network [OSTI]

Optical scattering noise in high Q fiber ring resonators and its effect on optoelectronic is used as the frequency reference device in an optoelectronic oscillator (OEO), it has been found using optical delay lines and the optoelectronic oscillator (OEO) approach [1]. Although delay line

Paris-Sud XI, Université de

310

Fiber-optic sensor for detection of hydrogen peroxide in PEM fuel cells Juan F. Botero-Cadavid  

E-Print Network [OSTI]

Fiber-optic sensor for detection of hydrogen peroxide in PEM fuel cells by Juan F. Botero-optic sensor for detection of hydrogen peroxide in PEM fuel cells by Juan F. Botero-Cadavid Mech electrolyte membrane fuel cells (PEMFCs), and the presence and formation of this peroxide has been associated

Victoria, University of

311

Bright and dark solitons in the normal dispersion regime of inhomogeneous optical fibers: Soliton interaction and soliton control  

SciTech Connect (OSTI)

Symbolically investigated in this paper is a nonlinear Schroedinger equation with the varying dispersion and nonlinearity for the propagation of optical pulses in the normal dispersion regime of inhomogeneous optical fibers. With the aid of the Hirota method, analytic one- and two-soliton solutions are obtained. Relevant properties of physical and optical interest are illustrated. Different from the previous results, both the bright and dark solitons are hereby derived in the normal dispersion regime of the inhomogeneous optical fibers. Moreover, different dispersion profiles of the dispersion-decreasing fibers can be used to realize the soliton control. Finally, soliton interaction is discussed with the soliton control confirmed to have no influence on the interaction. The results might be of certain value for the study of the signal generator and soliton control.

Liu Wenjun [School of Science, P. O. Box 122, Beijing University of Posts and Telecommunications, Beijing 100876 (China); Tian Bo, E-mail: tian.bupt@yahoo.com.c [School of Science, P. O. Box 122, Beijing University of Posts and Telecommunications, Beijing 100876 (China); State Key Laboratory of Software Development Environment, Beijing University of Aeronautics and Astronautics, Beijing 100191 (China); Key Laboratory of Information Photonics and Optical Communications (BUPT), Ministry of Education, P. O. Box 128, Beijing University of Posts and Telecommunications, Beijing 100876 (China); Xu Tao; Sun Kun; Jiang Yan [School of Science, P. O. Box 122, Beijing University of Posts and Telecommunications, Beijing 100876 (China)

2010-08-15T23:59:59.000Z

312

Spectral purification and stabilization of an acousto-optic tunable filter based on water-filled solid-core microstructured fiber  

Science Journals Connector (OSTI)

Compared with its air-filled counterpart, experimental results show that the acousto-optic tunable filter employing water-filled microstructured fiber exhibits certain red shift in...

Qiu, Minghui; Zhang, Hao; Miao, Yinping; Liu, Bo; Liu, Lihui

313

Limitations on High Data Rate Optical Fiber Transmission Systems Due to Transmission Impairment  

SciTech Connect (OSTI)

This project supplemented our regular DOE grant from the Basic Energy Sciences organization with the goal of fostering industrial partnerships and student internships. During the project period, we have interacted with between 15 and 20 companies in the optical fiber telecommunications equipment industry, and our students have participated in a number of highly visible projects with companies such as Ciena, Science Applications International Corporation, KDD, ATT, Virtual Photonics, Inc., Phaethon Telecommunications, PhotonEx, and others. The project led to many successful interactions and numerous job offers for our students.

Menyuk, Curtis R.

2002-03-15T23:59:59.000Z

314

Optical fiber imaging for high speed plasma motion diagnostics: Applied to low voltage circuit breakers  

SciTech Connect (OSTI)

An integrated portable measurement system is described for the study of high speed and high temperature unsteady plasma flows such as those found in the vicinity of high current switching arcs. An array of optical fibers allows the formation of low spatial resolution images, with a maximum capture rate of 1x10{sup 6} images per second (1 MHz), with 8 bit intensity resolution. Novel software techniques are reported to allow imaging of the arc; and to measure arc trajectories. Results are presented on high current (2 kA) discharge events in a model test fixture and on the application to a commercial low voltage circuit breaker.

McBride, J. W. [School of Engineering Sciences, University of Southampton, Highfield, Southampton SO17 1BJ (United Kingdom); Balestrero, A.; Tribulato, G. [ABB SACE DIVISION, ABB S.p.A., Via Baioni, Bergamo 35 IT-24123 (Italy); Ghezzi, L. [ABB SACE DIVISION, ABB S.p.A., Viale dell'Industria, Vittuone (MI)18 IT-20010 (Italy); Cross, K. J. [Taicaan Ltd., 2 Venture Road, Southampton Science Park, Southampton, Hampshire SO16 7NP (United Kingdom)

2010-05-15T23:59:59.000Z

315

Fiber optic inclination detector system having a weighted sphere with reference points  

DOE Patents [OSTI]

A fiber optic inclination detector system for determining the angular displacement of an object from a reference surface includes a simple mechanical transducer which requires a minimum number of parts and no electrical components. The system employs a single light beam which is split into two light beams and provided to the transducer. Each light beam is amplitude modulated upon reflecting off the transducer to detect inclination. The power values associated with each of the reflected light beams are converted by a pair of photodetectors into voltage signals, and a microprocessor manipulates the voltage signals to provide a measure of the angular displacement between the object and the reference surface.

Cwalinski, Jeffrey P. (Ballston Lake, NY)

1995-01-01T23:59:59.000Z

316

Evaluation of White Light Sources For an Absolute Fiber Optic Sensor Readout System  

SciTech Connect (OSTI)

This report summarizes work done in pursuit of an absolute readout system for Fabry-Perot optics sensors such as those built both by FISO and LLNL. The use of white light results in a short coherence length reducing the ambiguity of the Fabry-Perot gap measurement which is required to readout the sensor. The light source coherence length is the critical parameter in determining the ability to build a relative or an absolute system. Optical sources such as lasers and LEDs are rather narrow in optical spectral bandwidth and have long coherence length. Thus, when used in interferometric sensor measurements, one fringe looks much like another and it is difficult to make an absolute measurement. In contrast, white light sources are much broader in spectral bandwidth and have very short coherence lengths making interferometry possible only over the coherence length, which can be 1 or 2 microns. The small number of fringes in the interferogram make it easier to calculate the centroid and to unambiguously determine the sensor gap. However, unlike LEDs and Lasers, white light sources have very low optical power when coupled into optical fibers. Although, the overall light output of a white light source can be hundreds of milliwatts to watts, it is difficult to couple more than microwatts into a 50-micron core optical fiber. In addition, white light sources have a large amount of optical power in spectrum that is not necessarily useful in terms of sensor measurements. The reflectivity of a quarter wave of Titanium Oxide is depicted in Figure 2. This coating of Titanium Oxide is used in the fabrication of the sensor. This figure shows that any light emitted at wavelengths shorter than 600 nm is not too useful for the readout system. A white light LED spectrum is depicted in Figure 3 and shows much of the spectrum below 600 nm. In addition Silicon photodiodes are usually used in the readout system limiting the longest wavelength to about 1100 nm. Tungsten filament sources may have much of their optical power at wavelengths longer than 1100 nm, which is outside the wavelength range of interest. An incandescent spectrum from a tungsten filament is depicted in Figure 4. None of this is to say that other types of readout systems couldn't be built with IR detectors and broadband coatings for the sensors. However, without reengineering the sensors, the wavelength restrictions must be tolerated.

McConaghy, C F

2003-10-10T23:59:59.000Z

317

Fiber optic detector and method for using same for detecting chemical species  

DOE Patents [OSTI]

An optical sensing device for uranyl and other substances, a method for making an optical sensing device and a method for chemically binding uranyl and other indicators to glass, quartz, cellulose and similar substrates. The indicator, such as arsenazo III, is immobilized on the substrate using a chemical binding process. The immobilized arsenazo III causes uranyl from a fluid sample to bind irreversibly to the substrate at its active sites, thus causing absorption of a portion of light transmitted through the substrate. Determination of the amount of light absorbed, using conventional means, yields the concentration of uranyl present in the sample fluid. The binding of uranyl on the substrate can be reversed by subsequent exposure of the substrate to a solution of 2,6-pyridinedicarboxylic acid. The chemical binding process is suitable for similarly binding other indicators, such as bromocresol green.

Baylor, Lewis C. (North Augusta, SC); Buchanan, Bruce R. (Perkiomenville, PA)

1995-01-01T23:59:59.000Z

318

Bubbly Flow Experiment in Channel Using an Optical Probe and Tracking Algorithm  

E-Print Network [OSTI]

communication between the computer and optoelectronic unit. The probe takes advantage of the physics between two mediums, air and water (Fig. 8). The optical fiber, manufactured from glass, relays the signal in the probe. Internal reflection allows...

Khan, Abdul

2012-10-19T23:59:59.000Z

319

Role of color center induced absorption in all?optical switching  

Science Journals Connector (OSTI)

We show that color center induced absorption can mimic two?photon absorption and may limit all?optical switching even for very short pulses. Two?photon and color center induced absorption are measured in a lead glass fiber.

K. W. DeLong; Victor Mizrahi; G. I. Stegeman; M. A. Saifi; M. J. Andrejco

1990-01-01T23:59:59.000Z

320

Generation of a permanent linear electro-optic effect in an optical fiber by poling  

E-Print Network [OSTI]

. The modulated light was detected by a silicon photodiode( SD-100-11- 11-021 ). The junction capacitance of the photodiode is 230pF under 5 volts reversed bias which requires the load resistance to be less than 800kA to achieve a low cutoff frequency of 1 k..., and nv are refrective indies along x and y directions, respec- tively, and &p is a phase constant. The beam transmitted out of the fiber passes through an analyzer before reaching the photodiode. The axis o f the analyzer is adjusted to a, 45 angle...

Hu, Xiaochao

2012-06-07T23:59:59.000Z

Note: This page contains sample records for the topic "optical glass fibers" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

Optical  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Optical Optical fiber-based single-shot picosecond transient absorption spectroscopy Andrew R. Cook aÍ’ and Yuzhen Shen Department of Chemistry, Brookhaven National Laboratory, Upton, New York 11973, USA Í‘Received 27 January 2009; accepted 29 May 2009; published online 17 July 2009Í’ A new type of single-shot transient absorption apparatus is described based on a bundle of optical fibers. The bundle contains 100 fibers of different lengths, each successively giving Ďł15 ps longer optical delay. Data are collected by imaging light from the exit of the bundle into a sample where it is overlapped with an electron pulse or laser excitation pulse, followed by imaging onto a charge coupled device Í‘CCDÍ’ detector where the intensity of light from each fiber is measured simultaneously. Application to both ultrafast pump-probe spectroscopy and pulse radiolysis is demonstrated. For pulse

322

High-temperature fiber optic cubic-zirconia pressure sensor - article no. 124402  

SciTech Connect (OSTI)

There is a critical need for pressure sensors that can operate reliably at high temperatures in many industrial segments such as in the combustion section of gas turbine engines for both transportation and power generation, coal gasifiers, coal fired boilers, etc. Optical-based sensors are particularly attractive for the measurement of a wide variety of physical and chemical parameters in high-temperature and high-pressure industrial environments due to their small size and immunity to electromagnetic interference. A fiber optic pressure sensor utilizing single-crystal cubic zirconia as the sensing element is reported. The pressure response of this sensor has been measured at temperatures up to 1000{sup o}C. Additional experimental results show that cubic zirconia could be used for pressure sensing at temperatures over 1000{sup o}C. This study demonstrates the feasibility of using a novel cubic-zirconia sensor for pressure measurement at high temperatures.

Peng, W.; Pickrell, G.R.; Wang, A.B. [Virginia Polytechnic Institute & State University, Blacksburg, VA (United States)

2005-12-15T23:59:59.000Z

323

Integrability aspects with optical solitons of a generalized variable-coefficient N-coupled higher order nonlinear Schroedinger system from inhomogeneous optical fibers  

SciTech Connect (OSTI)

For describing the long-distance communication and manufacturing problems of N fields propagation in inhomogeneous optical fibers, we consider a generalized variable-coefficient N-coupled nonlinear Schroedinger system with higher order effects such as the third-order dispersion, self-steepening and self-frequency shift. Using the Painleve singularity structure analysis, we obtain two cases for this system to admit the Painleve property. Then for case (1) we derive the optical dark solitons via solving the Hirota bilinear equations; and based on the obtained (2N+1)x(2N+1) Lax pair, we construct the Darboux transformation to obtain the optical bright solitons (including the multisoliton profiles) for case (2). Finally, the features of optical solitons (both dark and bright ones) in inhomogeneous optical fibers are analyzed and graphically discussed.

Lue Xing; Li Juan; Zhang Haiqiang; Xu Tao; Li Lili [School of Science, Beijing University of Posts and Telecommunications, P.O. Box 49, Beijing 100876 (China); Tian Bo [School of Science, Beijing University of Posts and Telecommunications, P.O. Box 49, Beijing 100876 (China); State Key Laboratory of Software Development Environment, Beijing University of Aeronautics and Astronautics, Beijing 100191 (China); Key Laboratory of Information Photonics and Optical Communications (BUPT), Ministry of Education, Beijing University of Posts and Telecommunications, P.O. Box 128, Beijing 100876 (China)

2010-04-15T23:59:59.000Z

324

DEVELOPMENT OF NOVEL CERAMIC NANOFILM-FIBER INTEGRATED OPTICAL SENSORS FOR RAPID DETECTION OF COAL DERIVED SYNTHESIS GAS  

SciTech Connect (OSTI)

The overall goal of this project is to conduct fundamental studies on advanced ceramic materials and fiber optic devices for developing new types of high temperature (>500{degree}C) fiber optic chemical sensors (FOCS) for monitoring fossil (mainly coal) and biomass derived gases in power plants. The primary technical objective is to investigate and demonstrate the nanocrystalline doped-ceramic thin film enabled FOCS that possess desired stability, sensitivity and selectivity for in-situ, rapid gas detection in the syngas streams from gasification and combustion flue gases. This report summarizes research works of two integrated parts: (1) development of metal oxide solid thin films as sensing materials for detection and measurement of important gas components relevant to the coal- and biomass-derived syngas and combustion gas streams at high temperatures; and (2) development of fiber optic devices that are potentially useful for constructing FOCS in combination with the solid oxide thin films identified in this program.

Junhang Dong; Hai Xiao; Xiling Tang; Hongmin Jiang; Kurtis Remmel; Amardeep Kaur

2012-09-30T23:59:59.000Z

325

Issues arising with the application of optical fiber transmission in class 1E systems in nuclear power plants  

SciTech Connect (OSTI)

The application of fiber optic links and networks in safety-critical systems in the next generation of nuclear power plants, as well as in some digital upgrades in present-day plants, will mean that these links must be highly reliable and able to withstand the effect of environmental stressors present at the installation location. This paper discusses the failure modes and age-related mechanisms of fiber optic transmission components and identifies environmental stressors that could adversely affect their reliability over the long term. Some of the standards that could be used in their qualification for safety-critical applications are also discussed briefly.

Korsah, K. [Oak Ridge National Lab., TN (United States); Antonescu, C. [Nuclear Regulatory Commission, Washington, DC (United States). Office of Nuclear Regulatory Research

1993-12-31T23:59:59.000Z

326

IEEE TRANSACTIONS ON NUCLEAR SCIENCE, VOL. 60, NO. 6, DECEMBER 2013 4251 Performance of Ge-Doped Optical Fiber as a  

E-Print Network [OSTI]

the thermoluminescent re- sponse of three Germanium-doped silica-based optical fibers obtained by varying the drawing limited number of investigations on the potential of commercially available silica based optical fibers, such TSL dosimetry efficiency can be extended for dose monitoring ap- plication in nuclear industry

Boyer, Edmond

327

Vol. 6, No. 4/April 1989/J. Opt. Soc. Am. B 67& Optical nonlinearities in CdSSejr-doped glass waveguides  

E-Print Network [OSTI]

semiconductor crystallites, typi- cally the mixed semiconductor CdS.Selx, that strongly in- fluence the opticalVol. 6, No. 4/April 1989/J. Opt. Soc. Am. B 67& Optical nonlinearities in CdSSejr-doped glass-optical properties of CdSxSel- doped glasschannel waveguides. The technique isused in situ and may be used

328

EVALUATION OF A UAV COMPOSITE WING SPAR REPAIR USING AN EMBEDDED OPTICAL FIBER RAYLEIGH BACK-SCATTERING DISTRIBUTED STRAIN SENSING  

E-Print Network [OSTI]

EVALUATION OF A UAV COMPOSITE WING SPAR REPAIR USING AN EMBEDDED OPTICAL FIBER RAYLEIGH BACK Branch, Tel-Aviv Israel ikressel@iai.co.il ABSTRACT A representing damaged UAV wing spar cap was repaired requirements for UAVs, where the substantiation of structural bonded joint can be based on: "repeatable

Paris-Sud XI, Université de

329

Multipoint Pressure and Temperature Sensing Fiber Optic Cable for Monitoring CO2 Sequestration  

SciTech Connect (OSTI)

This report describes the work completed on contract DE-FE0010116. The goal of this two year project was to develop and demonstrate in the laboratory a highly accurate multi-point pressure measurement fiber optic cable based on MEMS pressure sensors suitable for downhole deployment in a CO2 sequestration well. The sensor interrogator was also to be demonstrated in a remote monitoring system and environmental testing was to be completed to indicate its downhole survivability over a lengthy period of time (e.g., 20 years). An interrogator system based on a pulsed laser excitation was shown to be capable of multiple (potentially 100+) simultaneous sensor measurements. Two sensors packages were completed and spliced in a cable onto the same fiber and measured. One sensor package was subsequently measured at high temperatures and pressures in supercritical CO2, while the other package was measured prior and after being subjected to high torque stresses to mimic downhole deployment. The environmental and stress tests indicated areas in which the package design should be further improved.

Challener, William

2014-12-31T23:59:59.000Z

330

Embedded Fiber Optic Probes to Measure Detonation Velocities Using the Photonic Doppler Velocimeter  

SciTech Connect (OSTI)

Detonation velocities for high explosives can be in the 7 to 8 km/s range. Previous work has shown that these velocities may be measured by inserting an optical fiber probe into the explosive assembly and recording the velocity time history using a Fabry-Perot velocimeter. The measured velocity using this method, however, is the actual velocity multiplied times the refractive index of the fiber core, which is on the order of 1.5. This means that the velocimeter diagnostic must be capable of measuring velocities as high as 12 km/s. Until recently, a velocity of 12 km/s was beyond the maximum velocity limit of a homodyne-based velocimeter. The limiting component in a homodyne system is usually the digitizer. Recently, however, digitizers have come on the market with 20 GHz bandwidth and 50 GS/s sample rate. Such a digitizer coupled with high bandwidth detectors now have the total bandwidth required to make velocity measurements in the 12 km/s range. This paper describes measurements made of detonation velocities using a high bandwidth homodyne system.

Hare, D E; Holtkamp, D B; Strand, O T

2010-03-02T23:59:59.000Z

331

Detection of adulteration in virgin olive oil using a fiber optic long period grating based sensor  

Science Journals Connector (OSTI)

A fiber optic sensing system for the detection of adulteration of virgin olive oil by less expensive sunflower oil is presented. The fundamental principle of detection is the sensitive dependence of the resonance peaks of a long period grating (LPG) on the changes in the refractive index of the environmental medium surrounding the cladding surface of the grating. The performance of the sensor has been tested by monitoring the amplitude changes of the attenuation bands of the LPG in response to variation of adulteration level. With good repeatability, the detection limit of adulteration is 4% and the sensor sensitivity is around 0.07 dB vol%?1 of adulterant in the measurement range. The developed sensor is user-friendly, reusable and allows instantaneous measurement of the amount of adulteration without involving any reagents.

T M Libish; M C Bobby; J Linesh; S Mathew; C Pradeep; V P N Nampoori; P Biswas; S Bandyopadhyay; K Dasgupta; P Radhakrishnan

2013-01-01T23:59:59.000Z

332

In situ, subsurface monitoring of vapor-phase TCE using fiber optics  

SciTech Connect (OSTI)

A vapor-phase, reagent-based, fiber optic trichloroethylene (TCE) sensor developed by Lawrence Livermore National Laboratory (LLNL) was demonstrated at the Savannah River Site (SRS) in two configurations. The first incorporated the sensor into a down-well instrument bounded by two inflatable packers capable of sealing an area for discrete depth analysis. The second involved an integration of the sensor into the probe tip of the Army Corps of Engineers Waterways Experiment Station (WES) cone penetrometry system. Discrete depth measurements of vapor-phase concentrations of TCE in the vadose zone were successfully made using both configurations. These measurements demonstrate the first successful in situ sensing (as opposed to sampling) of TCE at a field site.

Rossabi, J. [Westinghouse Savannah River Co., Aiken, SC (United States); Colston, B. Jr.; Brown, S.; Milanovich, F. [Lawrence Livermore National Lab., CA (United States); Lee, L.T. Jr. [Army Engineer Waterways Experiment Station, Vicksburg, MS (United States). Geotechnical Lab.

1993-03-05T23:59:59.000Z

333

Fast Inverse Nonlinear Fourier Transform For Generating Multi-Solitons In Optical Fiber  

E-Print Network [OSTI]

The achievable data rates of current fiber-optic wavelength-division-multiplexing (WDM) systems are limited by nonlinear interactions between different subchannels. Recently, it was thus proposed to replace the conventional Fourier transform in WDM systems with an appropriately defined nonlinear Fourier transform (NFT). The computational complexity of NFTs is a topic of current research. In this paper, a fast inverse NFT algorithm for the important special case of multi-solitonic signals is presented. The algorithm requires only $\\mathcal{O}(D\\log^{2}D)$ floating point operations to compute $D$ samples of a multi-soliton. To the best of our knowledge, this is the first algorithm for this problem with $\\log^{2}$-linear complexity. The paper also includes a many samples analysis of the generated nonlinear Fourier spectra.

Wahls, Sander

2015-01-01T23:59:59.000Z

334

Optical-Fiber Gravitational Wave Detector: Dynamical 3-Space Turbulence Detected  

E-Print Network [OSTI]

Preliminary results from an optical-fiber gravitational wave interferometric detector are reported. The detector is very small, cheap and simple to build and operate. It is assembled from readily available opto-electronic components. A parts list is given. The detector can operate in two modes: one in which only instrument noise is detected, and data from a 24 hour period is reported for this mode, and in a 2nd mode in which the gravitational waves are detected as well, and data from a 24 hour period is analysed. Comparison shows that the instrument has a high S/N ratio. The frequency spectrum of the gravitational waves shows a pink noise spectrum, from 0 to 0.1Hz.

Reginald T Cahill

2007-07-16T23:59:59.000Z

335

Structural and environmental monitoring of tracker and vertex systems using Fiber Optic Sensors  

E-Print Network [OSTI]

Fibre optic sensors (FOS) are an established technique for environmental and deformation monitoring in several areas like civil engineering, aerospace, and energy. Their immunity to electromagnetic and magnetic fields and nuclear environments, its small size, multiplexing capability and the possibility to be embedded make them an attractive technology for the structural and environmental monitoring of collider particle physics experiments. Between all the possible Fibre Optic sensors FBGs (Fiber Bragg Grating) seems to be the best solution for HEP applications. The first step was to characterize FBG sensors for it use in High Energy Physics environment. During last two years we have checked the resistance of the Fibre Bragg Grating sensors to radiation. Two irradiation campaigns with protons have been done at CNA (Centro Nacional de Aceleradores). In the near future these sensors are being planned to be used in detectors (the closest one Belle II.). Several work on integration issues in Belle II PXD-SVD, and checking for environmental and deformation monitoring in the detectors inner part has been done.

David Moya; Iván Vila

2012-03-01T23:59:59.000Z

336

E-Print Network 3.0 - automated fiber pigtailing Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

fiber pigtailing is based... Epoxyless Fiber-to-Submount Bonding for Active Fiber Optoelectronic and Fiber Backplane Applications Don C... Abstract--A fiber-coupled optical...

337

E-Print Network 3.0 - all-optical chalcogenide glass Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Z. L. Smson et al.: Chalcogenide glasses in ... Source: Zheludev, Nikolay - Optoelectronics Research Centre & School of Physics and Astronomy, University of Southampton...

338

Spark-plug-mounted fiber optic sensor for measuring in-cylinder pressure in engines  

E-Print Network [OSTI]

A new design for an in-cylinder fiber Fabry-Perot interferometer (FFPI) pressure sensor suitable for automotive engines has been investigated experimentally. The FFPI sensor consists of a single mode fiber containing two internal mirrors which form...

Bae, Taehan

2012-06-07T23:59:59.000Z

339

Development of a process control sensor for the glass industry. Phase 2: Prototype design, development and demonstration  

SciTech Connect (OSTI)

This report describes an advanced multichannel, on-line optical system for the non-contact measurement of forehearth glass melt temperatures at depth. The analyzer employs multiple narrow infrared (IR) band measurements of glass radiation to reconstruct the glass temperature profiles at depth. The TAS replaces expensive Tri-plex thermocouples, which frequently have service lives as short as 6 months to 1 years. By using passive non-contact sensor heads and fiber optic cables, temperature sensitive electronic components can be located at a safe distance from the hostile process environment. This provides significantly better reliability of the vulnerable electro-optic components and ready access for maintenance.

Gardner, M.; Candee, A.; Koppang, R.

1994-06-01T23:59:59.000Z

340

A simple scheme for universal linear optics quantum computing with constant experimental complexity using fiber-loops  

E-Print Network [OSTI]

Recently, Motes, Gilchrist, Dowling & Rohde [Phys. Rev. Lett. 113, 120501 (2014)] presented a scheme for photonic boson-sampling using a fiber-loop architecture. Here we show that the same architecture can be modified to implement full, universal linear optics quantum computing, in various incarnations. The scheme employs two embedded fiber-loops, a single push-button photon source, three dynamically controlled beamsplitters, and a single time-resolved photo-detector. The architecture has only a single point of interference, and thus may be significantly easier to align than other schemes. The experimental complexity of the scheme is constant, irrespective of the size of the computation, limited only by fiber lengths and their respective loss rates.

Peter P. Rohde

2014-10-02T23:59:59.000Z

Note: This page contains sample records for the topic "optical glass fibers" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

100 Mb/s Ethernet Transmission Over 275 m ofLarge Core Step Index Polymer Optical Fiber: Results From the POF-ALL European Project  

Science Journals Connector (OSTI)

We present our prototype solution for transmitting 100 Mb/s Ethernet data over large core (1 mm) step-index polymer optical fiber (POF), as one of the final results of the...

Cárdenas Lopez, Daniel Felipe; Nespola, Antonino; Camatel, Stefano; Abrate, Silvio; Gaudino, Roberto

2009-01-01T23:59:59.000Z

342

Optimization of Manufacturability of Chalcogenide Glasses for Mid-infrared Optical Components  

Science Journals Connector (OSTI)

Next generation optical components will require materials that possess unique, spectral-specific optical functions and forming compatible attributes defined by their chemistry,...

Richardson, Kathleen A; Smith, Charmayne; Koontz, Erick; Chamma, Karima; Gleason, Benn; Musgraves, J David; Wachtel, Peter

343

Investigation of the use of an Er:YAG laser and a fluoride glass fiber for laser angioplasty  

E-Print Network [OSTI]

polishing. The fiber end preparation was found to be critical and the best result ivas obtained with the fibers wet-polished with alu- mina slurry and polishing cloth. With this method there were alniost no scratches visible using the microscope at 1000... irradiation was proved with an artificial plaque sample in air. The ablation threshold was 20 mJ/mm and the ablation rate ivas 0. 45 mms/J. The ablated volume per pulse was almost linearly dependent upon incident fluence up to 2000 mJ/mm . The ablated hole...

Kwark, Bongsin

1989-01-01T23:59:59.000Z

344

New oxyfluoride glass with high fluorine content and laser patterning of nonlinear optical BaAlBO{sub 3}F{sub 2} single crystal line  

SciTech Connect (OSTI)

A new oxyfluoride glass of 50BaF{sub 2}-25Al{sub 2}O{sub 3}-25B{sub 2}O{sub 3} (mol. %) with a large fraction of fluorine, i.e., F/(F + O) = 0.4, was prepared using a conventional melt-quenching method in order to synthesize new glass-ceramics containing nonlinear optical oxyfluoride crystals. The refractive index at 632.8 nm and ultra-violet cutoff wavelength of the glass were 1.564 and {approx}200 nm, respectively. Eu{sup 3+} ions in the glass showed a high quantum yield of 88% in the photoluminescence spectrum in the visible region. BaAlBO{sub 3}F{sub 2} crystals (size: 50-100 nm) showing second harmonic generations were formed through the crystallization of the glass. Lines consisting of BaAlBO{sub 3}F{sub 2} crystals were patterned successfully on the glass surface by laser irradiations (Yb:YVO{sub 4} laser with a wavelength of 1080 nm, laser power of 1.1 W, scanning speed of 8 {mu}m/s). High resolution transmission electron microscope observations combined with a focused ion beam technique indicate that BaAlBO{sub 3}F{sub 2} crystals are highly oriented just like a single crystal. The present study proposes that the new oxyfluoride glass and glass-ceramics prepared have a high potential for optical device applications.

Shionozaki, K.; Honma, T.; Komatsu, T. [Department of Materials Science and Technology, Nagaoka University of Technology, 1603-1 Kamitomioka-cho, Nagaoka 940-2188 (Japan)

2012-11-01T23:59:59.000Z

345

An air flow sensor for neonatal mechanical ventilation applications based on a novel fiber-optic sensing technique  

SciTech Connect (OSTI)

In this work, a simple and low-cost air flow sensor, based on a novel fiber-optic sensing technique has been developed for monitoring air flows rates supplied by a neonatal ventilator to support infants in intensive care units. The device is based on a fiber optic sensing technique allowing (a) the immunity to light intensity variations independent by measurand and (b) the reduction of typical shortcomings affecting all biomedical fields (electromagnetic interference and patient electrical safety). The sensing principle is based on the measurement of transversal displacement of an emitting fiber-optic cantilever due to action of air flow acting on it; the fiber tip displacement is measured by means of a photodiode linear array, placed in front of the entrance face of the emitting optical fiber in order to detect its light intensity profile. As the measurement system is based on a detection of the illumination pattern, and not on an intensity modulation technique, it results less sensitive to light intensity fluctuation independent by measurand than intensity-based sensors. The considered technique is here adopted in order to develop two different configurations for an air flow sensor suitable for the measurement of air flow rates typically occurring during mechanical ventilation of newborns: a mono-directional and a bi-directional transducer have been proposed. A mathematical model for the air flow sensor is here proposed and a static calibration of two different arrangements has been performed: a measurement range up to 3.00 Multiplication-Sign 10{sup -4} m{sup 3}/s (18.0 l/min) for the mono-directional sensor and a measurement range of {+-}3.00 Multiplication-Sign 10{sup -4} m{sup 3}/s ({+-}18.0 l/min) for the bi-directional sensor are experimentally evaluated, according to the air flow rates normally encountered during tidal breathing of infants with a mass lower than 10 kg. Experimental data of static calibration result in accordance with the proposed theoretical model: for the mono-directional configuration, the coefficient of determination r{sup 2} is equal to 0.997; for the bi-directional configuration, the coefficient of determination r{sup 2} is equal to 0.990 for positive flows (inspiration) and 0.988 for negative flows (expiration). Measurement uncertainty {delta}Q of air flow rate has been evaluated by means of the propagation of distributions and the percentage error in the arrangement of bi-directional sensor ranges from a minimum of about 0.5% at -18.0 l/min to a maximum of about 9% at -12.0 l/min.

Battista, L.; Sciuto, S. A.; Scorza, A. [Department of Engineering, ROMA TRE University, via della Vasca Navale 79/81, Rome (Italy)

2013-03-15T23:59:59.000Z

346

Direct measurement of instantaneous source speed for a HDR brachytherapy unit using an optical fiber based detector  

SciTech Connect (OSTI)

Purpose: Several attempts to determine the transit time of a high dose rate (HDR) brachytherapy unit have been reported in the literature with controversial results. The determination of the source speed is necessary to accurately calculate the transient dose in brachytherapy treatments. In these studies, only the average speed of the source was measured as a parameter for transit dose calculation, which does not account for the realistic movement of the source, and is therefore inaccurate for numerical simulations. The purpose of this work is to report the implementation and technical design of an optical fiber based detector to directly measure the instantaneous speed profile of a {sup 192}Ir source in a Nucletron HDR brachytherapy unit. Methods: To accomplish this task, we have developed a setup that uses the Cerenkov light induced in optical fibers as a detection signal for the radiation source moving inside the HDR catheter. As the {sup 192}Ir source travels between two optical fibers with known distance, the threshold of the induced signals are used to extract the transit time and thus the velocity. The high resolution of the detector enables the measurement of the transit time at short separation distance of the fibers, providing the instantaneous speed. Results: Accurate and high resolution speed profiles of the {sup 192}Ir radiation source traveling from the safe to the end of the catheter and between dwell positions are presented. The maximum and minimum velocities of the source were found to be 52.0{+-}1.0 and 17.3{+-}1.2 cm/s. The authors demonstrate that the radiation source follows a uniformly accelerated linear motion with acceleration of |a|=113 cm/s{sup 2}. In addition, the authors compare the average speed measured using the optical fiber detector to those obtained in the literature, showing deviation up to 265%. Conclusions: To the best of the authors' knowledge, the authors directly measured for the first time the instantaneous speed profile of a radiation source in a HDR brachytherapy unit traveling from the unit safe to the end of the catheter and between interdwell distances. The method is feasible and accurate to implement on quality assurance tests and provides a unique database for efficient computational simulations of the transient dose.

Minamisawa, R. A.; Rubo, R. A.; Seraide, R. M.; Rocha, J. R. O.; Almeida, A. [Department of Physics and Mathematics, FFCLRP, University of Sao Paulo, 14040-901, Ribeirao Preto-SP (Brazil); INRAD, Medical School - University of Sao Paulo, Clinical Hospital (HCUSP), 05403-001, Sao Paulo-SP (Brazil); CAISM Radiotherapy Service, CEB, State University of Campinas, 13083-881, Campinas-SP (Brazil); Department of Physics and Mathematics, FFCLRP, University of Sao Paulo, 14040-901, Ribeirao Preto-SP (Brazil)

2010-10-15T23:59:59.000Z

347

The monitoring and multiplexing of fiber optic sensors using chirped laser sources  

E-Print Network [OSTI]

. Linearization of the chirp rate has been achieved using feedback from a fiber Fabry-Perot interferometer (FFPI) to adjust the voltage ramp which drives the rotating mirror. In a demonstration of monitoring an array of two fiber Bragg grating (FBG) sensors, a...

Wan, Xiaoke

2004-09-30T23:59:59.000Z

348

Improved 3-omega measurement of thermal conductivity in liquid, gases, and powders using a metal-coated optical fiber  

Science Journals Connector (OSTI)

A novel 3?thermal conductivitymeasurement technique called metal-coated 3? is introduced for use with liquids gases powders and aerogels. This technique employs a micron-scale metal-coated glass fiber as a heater/thermometer that is suspended within the sample. Metal-coated 3? exceeds alternate 3? based fluid sensing techniques in a number of key metrics enabling rapid measurements of small samples of materials with very low thermal effusivity (gases) using smaller temperature oscillations with lower parasitic conduction losses. Its advantages relative to existing fluid measurement techniques including transient hot-wire steady-state methods and solid-wire 3? are discussed. A generalized n-layer concentric cylindrical periodic heating solution that accounts for thermal boundary resistance is presented. Improved sensitivity to boundary conductance is recognized through this model. Metal-coated 3? was successfully validated through a benchmark study of gases and liquids spanning two-orders of magnitude in thermal conductivity.

Scott N. Schiffres; Jonathan A. Malen

2011-01-01T23:59:59.000Z

349

Ultra-High Precision Stamping of Fiber-Optic Connectors for Supercompu...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Supercomputers, datacenters, and telecom networks are increasingly dependent on optical networks for high-bandwidth digital communication. While innovation in electro-optical...

350

Novel fabrication and optoelectronic property of semiconductor filaments by optical-fiber thermal drawing  

E-Print Network [OSTI]

One dimensional nanostructure such as nanowires is typically fabricated by the wafer-based approach. Here we report nanowires are fabricated by thermal drawing of fiber. A thin viscous semiconductor film internal to the ...

Deng, D. S.

351

Laser ignition of flammable mixtures via a solid core optical fiber  

Science Journals Connector (OSTI)

To date no commercial fiber coupled laser systems have reached the irradiance and pulse energy required for flammable mixtures ignition. In this work we report preliminary results on the ignition of two-phase mix...

H. El-Rabii; G. Gaborel

2007-03-01T23:59:59.000Z

352

Sustainable Energy Solutions Task 4.1 Intelligent Manufacturing of Hybrid Carbon-Glass Fiber-Reinforced Composite Wind Turbine Blades  

SciTech Connect (OSTI)

EXECUTIVE SUMARY In this subtask, the manufacturability of hybrid carbon-glass fiber-reinforced composite wind turbine blades using Vacuum-Assisted Resin Transfer Molding (VARTM) was investigated. The objective of this investigation was to study the VARTM process and its parameters to manufacture cost-effective wind turbine blades with no defects (mainly eliminate dry spots and reduce manufacturing time). A 2.5-dimensional model and a 3-dimensional model were developed to simulate mold filling and part curing under different conditions. These conditions included isothermal and non-isothermal filling, curing of the part during and after filling, and placement of injection gates at different locations. Results from this investigation reveal that the process can be simulated and also that manufacturing parameters can be optimized to eliminate dry spot formation and reduce the manufacturing time. Using computer-based models is a cost-effective way to simulate manufacturing of wind turbine blades. The approach taken herein allows the design of the wind blade manufacturing processes without physically running trial-and-error experiments that are expensive and time-consuming; especially for larger blades needed for more demanding environmental conditions. This will benefit the wind energy industry by reducing initial design and manufacturing costs which can later be passed down to consumers and consequently make the wind energy industry more competitive.

Janet M Twomey, PhD

2010-04-30T23:59:59.000Z

353

E-Print Network 3.0 - automated fiber placement Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Bonding for Active Summary: Epoxyless Fiber-to-Submount Bonding for Active Fiber Optoelectronic and Fiber Backplane Applications Don C... Abstract--A fiber-coupled optical...

354

Development of a process control sensor for the glass industry  

SciTech Connect (OSTI)

This project was initiated to fill a need in the glass industry for a non-contact temperature sensor for glass melts. At present, the glass forming industry (e.g., bottle manufacture) consumes significant amounts of energy. Careful control of temperature at the point the bottle is molded is necessary to prevent the bottle from being rejected as out-of-specification. In general, the entire glass melting and conditioning process is designed to minimize this rejection rate, maximize throughput and thus control energy and production costs. This program focuses on the design, development and testing of an advanced optically based pyrometer for glass melts. The pyrometer operates simultaneously at four wavelengths; through analytical treatment of the signals, internal temperature profiles within the glass melt can be resolved. A novel multiplexer alloys optical signals from a large number of fiber-optic sensors to be collected and resolved by a single detector at a location remote from the process. This results in a significant cost savings on a per measurement point basis. The development program is divided into two phases. Phase 1 involves the construction of a breadboard version on the instrument and its testing on a pilot-scale furnace. In Phase 2, a prototype analyzer will be constructed and tested on a commercial forehearth. This report covers the Phase 1 activities.

Gardner, M.; Candee, A.; Kramlich, J.; Koppang, R.

1991-05-01T23:59:59.000Z

355

A practical, compact, high performance two-mode fiber acousto-optic frequency shifter  

E-Print Network [OSTI]

frequency as the interaction region is varied for a fiber having Ls=432 pm and 8=36. 5 I/m. matching frequency. This serves well for using a fairly high Q acoustic resonator for launching the flexural waves, the topic of the next chapter. The resulting... reliability. Also, the bandwidth of the device can be optimized 28 by using an acoustic horn with a, fairly broad acoustic response at the frequency of operation. llowever, for good performance the fiber must be well matched to both the LP~, mode stripper...

Siemsen, Patrick James

2012-06-07T23:59:59.000Z

356

Fiber Optic Micro-endoscopy for Detection of Bacteria in Early Stages of Infection  

E-Print Network [OSTI]

. have built a wide field Light Emitting Diode (LED) illumination based, 1 mm diameter fiber bundle micro-endoscope capable of sub-cellular resolution imaging (4 ?m resolution with 750 ?m field of view) for pre-cancer detection in the oral mucosa [16.... have built a wide field Light Emitting Diode (LED) illumination based, 1 mm diameter fiber bundle micro-endoscope capable of sub-cellular resolution imaging (4 ?m resolution with 750 ?m field of view) for pre-cancer detection in the oral mucosa [16...

Mufti, Nooman Sadat

2012-02-14T23:59:59.000Z

357

The Thermal Environment of the Fiber Glass Dome for the New Solar Telescope at Big Bear Solar Observatory  

E-Print Network [OSTI]

The New Solar Telescope (NST) is a 1.6-meter off-axis Gregory-type telescope with an equatorial mount and an open optical support structure. To mitigate the temperature fluctuations along the exposed optical path, the effects of local/dome-related seeing have to be minimized. To accomplish this, NST will be housed in a 5/8-sphere fiberglass dome that is outfitted with 14 active vents evenly spaced around its perimeter. The 14 vents house louvers that open and close independently of one another to regulate and direct the passage of air through the dome. In January 2006, 16 thermal probes were installed throughout the dome and the temperature distribution was measured. The measurements confirmed the existence of a strong thermal gradient on the order of 5 degree Celsius inside the dome. In December 2006, a second set of temperature measurements were made using different louver configurations. In this study, we present the results of these measurements along with their integration into the thermal control system (ThCS) and the overall telescope control system (TCS).

A. P. Verdoni; C. Denker; J. R. Varsik; S. Shumko; J. Nenow; R. Coulter

2007-08-04T23:59:59.000Z

358

Alkaline resistant phosphate glasses and method of preparation and use thereof  

DOE Patents [OSTI]

A substantially alkaline resistant calcium-iron-phosphate (CFP) glass and methods of making and using thereof. In one application, the CFP glass is drawn into a fiber and dispersed in cement to produce glass fiber reinforced concrete (GFRC) articles having the high compressive strength of concrete with the high impact, flexural and tensile strength associated with glass fibers.

Brow, Richard K. (Rolla, MO); Reis, Signo T. (Rolla, MO); Velez, Mariano (Rolla, MO); Day, Delbert E. (Rolla, MO)

2010-01-26T23:59:59.000Z

359

Toward a Broadband Astro-comb: Effects of Nonlinear Spectral Broadening in Optical Fibers  

E-Print Network [OSTI]

on an Yb-fiber source comb (with 1 GHz repetition rate) that is filtered by double-passing through a low for Astrophysics, Harvard University, 60 Garden St. Cambridge MA 02138 3 Department of Physics, Harvard University by using a filtering cavity configured for double-pass. As an explicit example, we present a design based

Walsworth, Ronald L.

360

Proceedings of IEEE Sensors 2003 Fiber Optic Oxygen Sensor for Power Plant Applications  

E-Print Network [OSTI]

is an efficient way to control boiler operation and reduce emissions. Time resolved measurements of oxygen at the far end of a Au clad high temperature silica fiber (continuous operation to 700 °C), as shown in Fig schemes in harsh environments. In this paper we report on the high temperature photophysical parameters

Ghosh, Ruby N.

Note: This page contains sample records for the topic "optical glass fibers" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

Sensors and Actuators B 123 (2007) 594605 Fiber optic sensing of liquid refractive index  

E-Print Network [OSTI]

Department of Physics, Indian Institute of Technology Kanpur, Kanpur 208016, India c Laser Technology Program of its cladding is shown to sense refractive index of a liquid in which the uncladded sensing region of the fiber. The sensitivity of the sensor to refractive index change is dependent on cladding thickness

362

Simultaneous measurement of group refractive index and thickness of optical samples using optical coherence tomography  

SciTech Connect (OSTI)

Optical coherence tomography (OCT), based on a Michelson interferometer and utilizing low coherence light as the optical source, is a novel technique for the noninvasive imaging of optical scattering media. A simple OCT scheme based on a 3x3 fiber coupler is presented for the simultaneous measurement of the refractive index and thickness of optical samples. The proposed system enables the refractive index and thickness to be determined without any prior knowledge of the sample parameters and is characterized by a simple and compact configuration, a straightforward measurement procedure, and a low cost. The feasibility of the proposed approach is demonstrated experimentally using BK7 and B270 optical glass samples.

Cheng, Hsu-Chih; Liu, Yi-Cheng

2010-02-10T23:59:59.000Z

363

Thin-Film Fiber Optic Sensors for Power Control and Fault Detection. Final Report  

SciTech Connect (OSTI)

Described is the development of an optical current measurement device, an active power conditioning system, and sol gel type thin films for the detection of magnetic fields.

Duncan, Paul Grems

2003-09-30T23:59:59.000Z

364

Ultrafast all?optical switching in a dual?core fiber nonlinear coupler  

Science Journals Connector (OSTI)

We report the first demonstration of a nonlinear coupler switch capable of substantially complete all?optical switching at subpicosecond rates with no light?induced thermal effects.

S. R. Friberg; Y. Silberberg; M. K. Oliver; M. J. Andrejco; M. A. Saifi; P. W. Smith

1987-01-01T23:59:59.000Z

365

April 1, 2002 / Vol. 27, No. 7 / OPTICS LETTERS 485 Light trapping in a fiber grating defect by four-wave mixing  

E-Print Network [OSTI]

the structures have a slow frequency response. Our approach is somewhat reminiscent of that of Winful and Perlin9 light in a defect state in a nonuniform fiber grating. The amount of energy deposited is estimated and the optical push broom.5 Here we propose another such demonstra- tion, namely, the storage of light

Sipe,J. E.

366

glass jewelry  

Science Journals Connector (OSTI)

various personal adornments decorated with glass or made of glass, beads, finger rings, pendants, necklaces,...

2009-01-01T23:59:59.000Z

367

Characterization of New Glass Coated Foam Glass Insulating Tiles by Standard Tests  

Science Journals Connector (OSTI)

A good thermal insulation of buildings is today more and more...1). Among insulating materials, foam glasses are increasing their importance because of...2). Foam glasses are fiber-free inorganic insulation mater...

Andrea Ventrella; Federico Smeacetto…

2012-11-01T23:59:59.000Z

368

4 th International Conference on Short & Medium bridges, Halifax, 8-11, August, 1994. Fiber Optic Sensing for Bridges  

E-Print Network [OSTI]

is the first in the world to use two types of carbon fiber composite prestressing tendons in several of its {steel and two types of carbon fiber composite} of prestressing tendons to be tracked over several months abe prospect of replacing this steel with carbon fiber based composite materials.1llese fiber reinfor

369

Energy Saving Scheme Based On Traffic Forwarding For Optical Fiber Access Networks  

Science Journals Connector (OSTI)

We report on an energy saving block that regroups and powers off OLTs during low traffic periods, resulting in energy savings up to 87,5% in the central office of optical access...

Arturo Rodé s Ló pez, G; Estaran, J; Vegas Olmos, J J; Tafur Monroy, I

370

Spatially distributed temperatures at the base of two mountain snowpacks measured with fiber-optic sensors  

E-Print Network [OSTI]

-optic sensors Scott W. TYLER,1 Susan A. BURAK,2 James P. MCNAMARA,3 Aurele LAMONTAGNE,3 John S. SELKER,4 Jeff melting patterns and the effects of solar heating on southwest-facing slopes. These proof

Selker, John

371

Optical remote monitoring of CH/sub 4/ gas using low-loss optical fiber link and InGaAsP light-emitting diode in 1. 33-. mu. m region  

SciTech Connect (OSTI)

Purely optical remote monitoring of low-level CH/sub 4/ gas is realized for the first time by the method employing a 2-km long-distance, low-loss silica optical fiber link and a compact absorption cell in conjunction with a high radiant InGaAsP light-emitting diode (LED) at 1.33 ..mu..m. Based on the present experiment, the detection limit of CH/sub 4/ in air was confirmed to be approximately 2000 ppm, i.e., 4% of the lower explosion limit of CH/sub 4/. This result supports the conclusion that the fully optical remote sensing system incorporating ultralow loss optical fiber networks and near infrared LEDs or laser diodes can be extensively used for the detection and surveillance of various inflammable and/or explosive gases in industrial and mining complexes as well as in residential areas.

Chan, K.; Ito, H.; Inaba, H.

1983-10-01T23:59:59.000Z

372

A study of semiconductor laser noise and its effect on fiber optic sensor performance  

E-Print Network [OSTI]

with internal mirrors separated by a length L of single-mode fiber. This sensor, which was introduced by the research group at Texas A8cM University [34], has been used to measure temperature, strain, and acoustic pressure [35]. Two beams, one reflected from... or the length L of FFPI sensors. If the reflectance of the mirrors is equal to R with R (& I, the reflected power P? is related to the incident power P; according to P, = 2RP&(1+ cos P) (2. 30) with 4=4~/c. Because the FFPI sensor will act like two beam...

Lee, Wanku

2012-06-07T23:59:59.000Z

373

HIPed carbon fiber reinforced silicon nitride composites  

SciTech Connect (OSTI)

Carbon fiber/Si3N4 composites were fabricated using slip infiltration of fiber bundles subsequently stacked in a plaster mold, dried, glass encapsulated, and HIPed to form unidirectional composite test bars. Neither chemical reactions between fiber and matrix nor thermal mismatch cracks in the matrix were observed. The bend fracture behavior of the composites was nonbrittle with extensive fiber pullout. 14 references.

Lundberg, R.; Pompe, R.; Carlsson, R.

1988-08-01T23:59:59.000Z

374

Surface treatment of glass-reinforced plastics: Structural study of silane finish layers on the surface of glass fillers. Modification of finishes by transition metal salts  

Science Journals Connector (OSTI)

The structure and chemical composition of glass fiber surface treatment substances and their influence on composite materials...

O. E. Fedorova; T. L. Ragulina

2010-10-01T23:59:59.000Z

375

Remote optical sensing on the nanometer scale with a bowtie aperture nano-antenna on a SNOM fiber tip  

E-Print Network [OSTI]

Plasmonic nano-antennas have proven the outstanding ability of sensing chemical and physical processes down to the nano-meter scale. Sensing is usually achieved within the highly confined optical fields generated resonantly by the nano-antennas, i.e. in contact to the nano-structures. In these paper, We demonstrate the sensing capability of nano-antennas to their larger scale environment, well beyond their plasmonic confinement volume, leading to the concept of 'remote' (non contact) sensing on the nano-meter scale. On the basis of a bowtie-aperture nano-antenna (BNA) integrated at the apex of a SNOM fiber tip, we introduce an ultra-compact, move-able and background-free optical nano-sensor for the remote sensing of a silicon surface (up to distance of 300 nm). Sensitivity of the BNA to its large scale environment is high enough to expect the monitoring and control of the spacing between the nano-antenna and a silicon surface with sub-nano-meter accuracy. This work paves the way towards a new class of nano-po...

Atie, Elie M; Eter, Ali El; Salut, Roland; Nedeljkovic, Dusan; Tannous, Tony; Baida, Fadi I; Grosjean, Thierry

2015-01-01T23:59:59.000Z

376

Broadband optical coupling between microstructured fibers and photonic band gap circuits: Two-dimensional paradigms  

E-Print Network [OSTI]

simple two-dimensional design models. We demonstrate an effective large- bandwidth small-footprint beam platform for integrated optics. Unlike conventional paradigms such as silicon on insulator SOI waveguides that guide light on a chip by total internal reflection index guiding , PBG-based microcircuits can guide

John, Sajeev

377

Review on optical fiber sensing technologies for industrial applications at the NEL-FOST  

E-Print Network [OSTI]

% of large oil tanks in China Petrochemical Company, fire and structural safety monitoring of the first optic hydrophones and gas sensors. However there still exist gaps to meet customer demand of the world's highest concrete face dam, fire alarm system of four national strategic oil storages and 90

Boyer, Edmond

378

Real-time processing of a long perimeter fiber optic intrusion system  

E-Print Network [OSTI]

This thesis reports on recent advances made in real-time intruder detection for an intrusion system developed at Texas A&M University that utilizes a phase-sensitive optical time-domain reflectometer. The system uses light pulses from a highly...

Snider, William Timothy

2009-09-30T23:59:59.000Z

379

Optical fibers by butyl methacrylate reactive extrusion Berthet Romuald, Chalamet Yvan, Taha Mohamed*, Zerroukhi Amar  

E-Print Network [OSTI]

limitations. Reactive extrusion experiments were carried out in a twin-screw extruder and the effect optical fibbers, polymethacrylate. Introduction Twin screw extruders are playing an increasing role of reactive extrusion is explained by the different advantages offered by the use of the twin-screw extruders

Paris-Sud XI, Université de

380

Optical sensing elements for nitrogen dioxide (NO.sub.2) gas detection, a sol-gel method for making the sensing elements and fiber optic sensors incorporating nitrogen dioxide gas optical sensing elements  

DOE Patents [OSTI]

A sensing element, a method of making a sensing element, and a fiber optic sensor incorporating the sensing element are described. The sensor can be used for the quantitative detection of NO.sub.2 in a mixture of gases. The sensing element can be made by incorporating a diazotizing reagent which reacts with nitrous ions to produce a diazo compound and a coupling reagent which couples with the diazo compound to produce an azo dye into a sol and allowing the sol to form an optically transparent gel. The sensing element changes color in the presence of NO.sub.2 gas. The temporal response of the absorption spectrum at various NO.sub.2 concentrations has also been recorded and analyzed. Sensors having different design configurations are described. The sensing element can detect NO.sub.2 gas at levels of parts per billion.

Mechery, Shelly John (Mississippi State, MS); Singh, Jagdish P. (Starkville, MS)

2007-07-03T23:59:59.000Z

Note: This page contains sample records for the topic "optical glass fibers" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

Diode-bar side-pumping of double-clad fibers.  

SciTech Connect (OSTI)

We demonstrate direct diode-bar side pumping of a Yb-doped fiber laser using embedded-mirror side pumping (EMSP). In this method, the pump beam is launched by reflection from a micro-mirror embedded in a channel polished into the inner cladding of a double-clad fiber (DCF). The amplifier employed an unformatted, non-lensed, ten-emitter diode bar (20 W) and glass-clad, polarization-maintaining, large-mode-area fiber. Measurements with passive fiber showed that the coupling efficiency of the raw diode-bar output into the DCF (ten launch sites) was {approx}84%; for comparison, the net coupling efficiency using a conventional, formatted, fiber-coupled diode bar is typically 50-70%, i.e., EMSP results in a factor of 2-3 less wasted pump power. The slope efficiency of the side-pumped fiber laser was {approx}80% with respect to launched pump power and 24% with respect to electrical power consumption of the diode bar; at a fiber-laser output power of 7.5 W, the EMSP diode bar consumed 41 W of electrical power (18% electrical-to-optical efficiency). When end pumped using a formatted diode bar, the fiber laser consumed 96 W at 7.5 W output power, a factor of 2.3 less efficient, and the electrical-to-optical slope efficiency was lower by a factor of 2.0. Passive-fiber measurements showed that the EMSP alignment sensitivity is nearly identical for a single emitter as for the ten-emitter bar. EMSP is the only method capable of directly launching the unformatted output of a diode bar directly into DCF (including glass-clad DCF), enabling fabrication of low-cost, simple, and compact, diode-bar-pumped fiber lasers and amplifiers.

Koplow, Jeffrey P.; Kliner, Dahv A.V.; Moore, Sean W. (Naval Research Laboratory, Washington, DC)

2005-02-01T23:59:59.000Z

382

Low-Cost, Fiber-Optic Hydrogen Gas Detector Using Guided-Wave, Surface-Plasmon Resonance in Chemochromic Thin Films  

SciTech Connect (OSTI)

Low-cost, hydrogen-gas-leak detectors are needed for many hydrogen applications, such as hydrogen-fueled vehicles where several detectors may be required in different locations on each vehicle. A fiber-optic leak detector could be inherently safer than conventional detectors, because it would remove all detector electronics from the vicinity of potential leaks. It would also provide freedom from electromagnetic interference, a serious problem in fuel-cell-powered electric vehicles. This paper describes the design of a fiber-optic, surface-plasmon-resonance hydrogen detector, and efforts to make it more sensitive, selective, and durable. Chemochromic materials, such as tungsten oxide and certain Lanthanide hydrides, can reversibly react with hydrogen in air while exhibiting significant changes in their optical properties. Thin films of these materials applied to a sensor at the end of an optical fiber have been used to detect low concentrations of hydrogen gas in air. The coatings include a thin silver layer in which the surface plasmon is generated, a thin film of the chemochromic material, and a catalytic layer of palladium that facilitates the reaction with hydrogen. The film thickness is chosen to produce a guided-surface plasmon wave along the interface between the silver and the chemochromic material. A dichroic beam-splitter separates the reflected spectrum into a portion near the resonance and a portion away from the resonance, and directs these two portions to two separate photodiodes. The electronic ratio of these two signals cancels most of the fiber transmission noise and provides a stable hydrogen signal.

Benson, D. K.; Tracy, C. E.; Lee, S-H. (National Renewable Energy Laboratory); Hishmeh, G. A.; Haberman, D. P. (DCH Technologies, Valencia, CA); Ciszek, P. A. (Evergreen Solar, Waltham, MA)

1998-10-20T23:59:59.000Z

383

Tetraethyl orthosilicate-based glass composition and method  

DOE Patents [OSTI]

A tetraethyl orthosilicate-based, sol-gel glass composition with additives selected for various applications is described. The composition is made by mixing ethanol, water, and tetraethyl orthosilicate, adjusting the pH into the acid range, and aging the mixture at room temperature. The additives, such as an optical indicator, filler, or catalyst, are then added to the mixture to form the composition which can be applied to a substrate before curing. If the additive is an indicator, the light-absorbing characteristics of which vary upon contact with a particular analyte, the indicator can be applied to a lens, optical fiber, reagent strip, or flow cell for use in chemical analysis. Alternatively, an additive such as alumina particles is blended into the mixture to form a filler composition for patching cracks in metal, glass, or ceramic piping. 12 figs.

Wicks, G.G.; Livingston, R.R.; Baylor, L.C.; Whitaker, M.J.; O`Rourke, P.E.

1997-06-10T23:59:59.000Z

384

Laser-induced fluorescence fiber optic probe measurement of oil dilution by fuel  

DOE Patents [OSTI]

Apparatus for detecting fuel in oil includes an excitation light source in optical communication with an oil sample for exposing the oil sample to excitation light in order to excite the oil sample from a non-excited state to an excited state and a spectrally selective device in optical communication with the oil sample for detecting light emitted from the oil sample as the oil sample returns from the excited state to a non-excited state to produce spectral indicia that can be analyzed to determine the presence of fuel in the oil sample. A method of detecting fuel in oil includes the steps of exposing a oil sample to excitation light in order to excite the oil sample from a non-excited state to an excited state, as the oil sample returns from the excited state to a non-excited state, detecting light emitted from the oil sample to produce spectral indicia; and analyzing the spectral indicia to determine the presence of fuel in the oil sample.

Parks, II, James E [Knoxville, TN; Partridge, Jr., William P [Oak Ridge, TN

2010-11-23T23:59:59.000Z

385

Use of hollow core fibers, fiber lasers, and photonic crystal fibers for spark delivery and laser ignition in gases  

Science Journals Connector (OSTI)

The fiber-optic delivery of sparks in gases is challenging as the output beam must be refocused to high

Joshi, Sachin; Yalin, Azer P; Galvanauskas, Almantas

2007-01-01T23:59:59.000Z

386

Er{sup 3+}-doped strontium lithium bismuth borate glasses for broadband 1.5 {mu}m emission - optical properties  

SciTech Connect (OSTI)

Strontium lithium bismuth borate glasses (SLBiB) doped with various concentrations of Er{sup 3+} were prepared using conventional melt quench technique and investigated their optical properties. The amorphous nature of the prepared glass samples was confirmed by X-ray diffraction and SEM analysis. Optical properties were studied by measuring the optical absorption and near infrared luminescence spectra at room temperature. Judd-Ofelt (J-O) theory has been applied for the f.f transitions of Er{sup 3+} ions to evaluate J-O intensity parameters, {Omega}{lambda} ({lambda} = 2, 4 and 6). Using the J-O intensity parameters, radiative properties such as transition probabilities (A{sub R}), branching ratios ({beta}) and radiative lifetimes ({tau}) are estimated for certain transitions. From the emission spectra, peak emission-cross sections ({sigma}{sub p}) and products of stimulated emission cross-section and full width at half maximum ({sigma}{sub p} Multiplication-Sign FWHM) were calculated for the observed emission transition, {sup 4}I{sub 13/2}{yields}{sup 4}I{sub 15/2}.

Rajesh, D.; Balakrishna, A.; Ratnakaram, Y. C. [Department of Physics, Sri Venkateswara University, Tirupati-517502 (India)

2013-02-05T23:59:59.000Z

387

Arrangement for multiplexing and intensity splitting light beams for interface into fiber optic cables  

DOE Patents [OSTI]

An arrangement especially suitable for use in a laser apparatus for converting a plurality of different input light beams, for example copper vapor laser beams, into a plurality of substantially identical light beams is disclosed herein. This arrangement utilizes an optical mixing bar which is preferably integrally formed as a single unit and which includes a main body for mixing light therein, a flat input surface on one end of the main body, and a multi-faceted output face on the opposite end of the main body. This arrangement also includes means for directing the plurality of different input light beams onto the input face of the mixing base, whereby to cause the different beams to mix within the main body of the mixing bar and exit the latter from its multi-faceted output face as the desired plurality of substantially identical output beams.

Johnson, Steve A. (Tracy, CA)

1990-01-01T23:59:59.000Z

388

Investigation of a chalcohalide glass optical waveguide structure fabricated by dual-energy carbon-ion implantation  

Science Journals Connector (OSTI)

A planar waveguide structure in a chalcohalide glass was fabricated by dual-energy C ion implantation with energies of 5.5 and 6.0 MeV at fluences of 7.0×1014 and...

Yu, Xiao-Fei; Liu, Tao; Zhang, Lian; Zhou, Yu-Fan; Wang, Tie-Jun; Wang, Xue-Lin

2014-01-01T23:59:59.000Z

389

Defects of a phosphosilicate glass exposed to the 193-nm radiation  

SciTech Connect (OSTI)

Induced absorption is measured in a hydrogen-unloaded phosphosilicate glass (PSG) in spectral ranges from 140 to 850 nm and from 1000 to 1700 nm before and after its exposure to the 193-nm radiation. It is shown that the induced-absorption bands in the range between 140 and 300 nm do not coincide with the bands observed earlier after exposing a PSG to X-rays. It is assumed that the photorefractive effect in the PSG is related to variations induced in the glass network rather than to defects responsible for the induced-absorption bands. (fiber and integrated optics)

Larionov, Yu V; Sokolov, V O; Plotnichenko, V G [Fiber Optics Research Center, Russian Academy of Sciences, Moscow (Russian Federation)

2007-06-30T23:59:59.000Z

390

Writing of nonlinear optical Sm{sub 2}(MoO{sub 4}){sub 3} crystal lines at the surface of glass by samarium atom heat processing  

SciTech Connect (OSTI)

Some glasses such as 21.25Sm{sub 2}O{sub 3}.63.75MoO{sub 3}.15B{sub 2}O{sub 3} (mol %) giving the formation of nonlinear optical Sm{sub 2}(MoO{sub 4}){sub 3} crystals through conventional crystallization in an electric furnace and through continuous-wave Nd: yttrium aluminum garnet (YAG) laser (wavelength: 1064 nm) irradiation (samarium atom heat processing) have been developed. It is proposed from x-ray diffraction analyses, micro-Raman-scattering spectra, and second-harmonic generation measurements that the crystal structure of Sm{sub 2}(MoO{sub 4}){sub 3} formed by the crystallization is the {beta}{sup '}-phase structure with an orthorhombic (noncentrosymmetric) symmetry. The lines consisting of nonlinear optical {beta}{sup '}-Sm{sub 2}(MoO{sub 4}){sub 3} crystals are written at the surface of glasses by YAG laser irradiation (laser power: P=0.4 W, laser scanning speed: S=1-10 {mu}m/s), and, in particular, homogeneous crystal lines are formed at the laser scanning speed of 1 {mu}m/s. Refractive index changes (not crystallization) are also induced by YAG laser irradiation of P=0.4 W and a high laser scanning speed of S=25 {mu}m/s. The crystallization mechanism in the laser-irradiated region has been proposed. The present study demonstrates that the samarium atom heat processing is a technique for the writing of rare earth containing optical nonlinear/ferroelectric crystal lines in glass.

Abe, M.; Benino, Y.; Fujiwara, T.; Komatsu, T.; Sato, R. [Department of Chemistry, Nagaoka University of Technology, 1603-1 Kamitomioka-cho, Nagaoka 940-2188 (Japan); Department of Materials Engineering, Tsuruoka National College of Technology, Tsuruoka 997-8511 (Japan)

2005-06-15T23:59:59.000Z

391

Abstract--We propose a compact tip-reflection fiber-optic vibration sensing system that uses a lateral-offset tilted fiber  

E-Print Network [OSTI]

a lateral-offset tilted fiber grating (TFBG) as sensor head and a vertical-cavity surface-emitting laser the coupling of light from the forward propagating core mode to backward propagating cladding modes and reduces cladding mode resonances appear. Since the response of core mode to external perturbations (temperature

Wai, Ping-kong Alexander

392

LongviewCowlitzFiberCX  

Broader source: Energy.gov (indexed) [DOE]

Proposed by: Bonneville Power Administration (BPA) Description of the Proposed Action: BPA proposes to add about three miles of aerial fiber optic cable to its Longview-Cowlitz...

393

E-Print Network 3.0 - artificial fiber spinning Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Design of a Hybrid STMSNOM for Spintronics & OptoelectronicsSpintronics & Optoelectronics the Interiorthe Interior Summary: -field optical fiber Far-field optical fiber...

394

Design and optimization of a flexible high-peak-power laser-to-fiber coupled illumination system used in digital particle image velocimetry  

SciTech Connect (OSTI)

We present a study on the design and parameter optimization of a flexible high-peak-power fiber-optic laser delivery system using commercially available solid-core silica fibers and an experimental glass hollow waveguide (HW). The fiber-optic delivery system provides a flexible, safe, and easily and precisely positioned laser irradiation for many applications including uniform illumination for digital particle image velocimetry (DPIV). The delivery fibers, when coupled through a line-generating lens, produce a uniform thin laser sheet illumination for accurate and repeatable DPIV two-dimensional velocity measurements. We report experimental results on homogenizing the laser beam profile using various mode-mixing techniques. Furthermore, because a fundamental problem for fiber-optic-based high-peak-power laser delivery systems is the possible damage effects of the fiber material, we determine experimentally the peak power density damage threshold of various delivery fibers designed for the visible spectral range at a typical DPIV laser wavelength of 532 nm. In the case of solid-core silica delivery fibers using conventional lens-based laser-to-fiber coupling, the damage threshold varies from 3.7 GW/cm{sup 2} for a 100-{mu}m-core-diameter high-temperature fiber to 3.9 GW/cm{sup 2} for a 200-{mu}m-core-diameter high-power delivery fiber, with a total output laser energy delivered of at least 3-10 mJ for those respective fibers. Therefore, these fibers are marginally suitable for most macro-DPIV applications. However, to improve the high-power delivery capability for close-up micro-DPIV applications, we propose and validate an experimental fiber link with much higher laser power delivery capability than the solid-core fiber links. We use an uncoated grazing-incidence-based tapered glass funnel coupled to a glass HW with hollow air-core diameter of 700 {mu}m, a low numerical aperture of 0.05, and a thin inside cladding of cyclic olefin polymer coating for optimum transmission at 532 nm. Because of the mode homogenizing effect and lower power density, the taper-waveguide laser delivery technique ensured high damage threshold for the delivery HW, and as a result, no damage occurred at the maximum measured input laser energy of 33 mJ used in this study.

Robinson, Ronald A.; Ilev, Ilko K. [FDA/CDRH, 9200 Corporate Blvd., HFZ-170, Rockville, Maryland 20850 (United States)

2004-11-01T23:59:59.000Z

395

Multimaterial rectifying device fibers  

E-Print Network [OSTI]

Electronic and optoelectronic device processing is commonly thought to be incompatible with much simpler thermal drawing techniques used in optical fiber production. The incorporation of metals, polymer insulators, and ...

Orf, Nicholas D

2009-01-01T23:59:59.000Z

396

Multimaterial multifunctional fiber devices  

E-Print Network [OSTI]

Optical fibers and semiconductor devices differ significantly in their properties and their processing approaches. The latter require an assembly of metal, insulator and semiconductor materials into complex geometries with ...

Sorin, Fabien

2008-01-01T23:59:59.000Z

397

High repetition rate fiber lasers  

E-Print Network [OSTI]

This thesis reports work in high repetition rate femtosecond fiber lasers. Driven by the applications including optical arbitrary waveform generation, high speed optical sampling, frequency metrology, and timing and frequency ...

Chen, Jian, Ph. D. Massachusetts Institute of Technology

2009-01-01T23:59:59.000Z

398

Glass Production  

E-Print Network [OSTI]

Late Bronze Age glasses. Journal of Archaeological Science781 - 789. Turner, W.E.S. 1954 Studies in ancient glassesand glass making processes. Part I: Crucibles and melting

Shortland, Andrew

2009-01-01T23:59:59.000Z

399

silica glass  

Science Journals Connector (OSTI)

...any amorphous, pale yellow to pale green natural silica glass such as moldavite, Libyan Desert glass, contains nearly 98% silica. RI:...

2009-01-01T23:59:59.000Z

400

Sol-GelGlasses  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Sol-Gel Glasses Sol-Gel Glasses Manufacturing Technologies The Manufacturing Science & Technology Center conducts process development and scale-up of ceramic and glass materials prepared by the sol- gel process. Sol-gel processing uses solutions prepared at low temperature rather than high temperature powder processing to make materi- als with controlled properties. A precursor sol-gel solution (sol) is either poured into a mold and allowed to gel or is diluted and applied to a sub- strate by spinning, dipping, spraying, elec- trophoresis, inkjet printing or roll coating. Controlled drying of the wet gel results in either a ceramic or glass bulk part or a thin film on a glass, plastic, ceramic or metal substrate. Sol-gel derived materials have diverse applications in optics, electronics, energy, space, sensors and

Note: This page contains sample records for the topic "optical glass fibers" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

Effect of the finishing oil of acrylic fibers in the optical rotation of the Raman scattered light  

Science Journals Connector (OSTI)

Polarized Raman spectra have been obtained from polyacrylonitrile copolymers fibers with vinyl acetate Poly(AN-co-VA), and methyl acrylate Poly(AN-co-MA) with finishing and without...

Rosales-Candelas, I; Soto-Bernal, J J; Gonzalez-Mota, R; Frausto-Reyes, C

2013-01-01T23:59:59.000Z

402

Optical-Fiber-Based, Time-Resolved Photoluminescence Spectrometer for Thin-Film Absorber Characterization and Analysis of TRPL Data for CdS/CdTe Interface: Preprint  

SciTech Connect (OSTI)

We describe the design of a time resolved photoluminescence (TRPL) spectrometer for rapid semiconductor absorber characterization. Simplicity and flexibility is achieved by using single optical fiber to deliver laser pulses and to collect photoluminescence. We apply TRPL for characterization of CdS/CdTe absorbers after deposition, CdCl2 treatment, Cu doping, and back contact formation. Data suggest this method could be applied in various stages of PV device processing. Finally, we show how to analyze TRPL data for CdS/CdTe absorbers by considering laser light absorption depth and intermixing at CdS/CdTe interface.

Kuciauskas, D.; Duenow, J. N.; Kanevce, A.; Li, J. V.; Young, M. R.; Dippo, P.; Levi, D. H.

2012-06-01T23:59:59.000Z

403

Optical Diagnostics Thomas Tsang  

E-Print Network [OSTI]

Optical Diagnostics Thomas Tsang · tight environment · high radiation area · non-serviceable area · passive components · optics only, no active electronics · transmit image through flexible fiber bundle #12;New imaging fiber bundle Core size: 12 µm, diameter: 1/8" Optical Diagnostics Total fiber counts ~50

McDonald, Kirk

404

Fiber optic compass development  

E-Print Network [OSTI]

part of the pattern 0th to 10th 11th to 20th 21st to 30th 31st to 40th 41st to 50th 51st to 60th 61st to 70th 71st to 80th 3 0.15 2.55 2.55 2.25 2.25 2.25 1.95 0.6 2.85 0.6 0.3 0.6 0.3 0.3 1.2 0.15 0.3 0.6 0.3 0.9 0.9 0.3 0.3 3.45 1.2 0.6 0.3 0.6 0....3 0.3 0.3 0.9 0.15 0.15 0.3 0.15 0.6 0.6 0.6 0.15 2.85 2.55 0.6 2.25 0.15 0.6 0.15 3.45 0.3 0.6 0.15 0.6 2.25 0.15 1.95 0.3 0.6 0.3 2.25 0.6 0.3 2.25 0.9 0.6 0.6 0.9 2.1 0.9 0.6 0.3 1.5 0.15 0.15 0.15 0.15 0.15 1.2 0.3 0.15 3.15 2.85 2.55 2.25 2...

Park, Kyongtae

2005-11-01T23:59:59.000Z

405

Fiber optic gap gauge  

SciTech Connect (OSTI)

A lightweight, small size, high sensitivity gauge for indirectly measuring displacement or absolute gap width by measuring axial strain in an orthogonal direction to the displacement/gap width. The gap gauge includes a preferably titanium base having a central tension bar with springs connecting opposite ends of the tension bar to a pair of end connector bars, and an elongated bow spring connected to the end connector bars with a middle section bowed away from the base to define a gap. The bow spring is capable of producing an axial strain in the base proportional to a displacement of the middle section in a direction orthogonal to the base. And a strain sensor, such as a Fabry-Perot interferometer strain sensor, is connected to measure the axial strain in the base, so that the displacement of the middle section may be indirectly determined from the measurement of the axial strain in the base.

Wood, Billy E. (Livermore, CA); Groves, Scott E. (Brentwood, CA); Larsen, Greg J. (Brentwood, CA); Sanchez, Roberto J. (Pleasanton, CA)

2006-11-14T23:59:59.000Z

406

Self-powdering and nonlinear optical domain structures in ferroelastic beta'-Gd{sub 2}(MoO{sub 4}){sub 3} crystals formed in glass  

SciTech Connect (OSTI)

Ferroelastic beta'-Gd{sub 2}(MoO{sub 4}){sub 3}, (GMO), crystals are formed through the crystallization of 21.25Gd{sub 2}O{sub 3}-63.75MoO{sub 3}-15B{sub 2}O{sub 3} glass (mol%), and two scientific curious phenomena are observed. (1) GMO crystals formed in the crystallization break into small pieces with a triangular prism or pyramid shape having a length of 50-500 {mu}m spontaneously during the crystallizations in the inside of an electric furnace, not during the cooling in air after the crystallization. This phenomenon is called 'self-powdering phenomenon during crystallization' in this paper. (2) Each self-powdered GMO crystal grain shows a periodic domain structure with different refractive indices, and a spatially periodic second harmonic generation (SHG) depending on the domain structure is observed. It is proposed from polarized micro-Raman scattering spectra and the azimuthal dependence of second harmonic intensities that GMO crystals are oriented in each crystal grain and the orientation of (MoO{sub 4}){sup 2-} tetrahedra in GMO crystals changes periodically due to spontaneous strains in ferroelastic GMO crystals. - Graphical abstract: This figure shows the polarized optical photograph at room temperature for a particle (piece) obtained by a heat treatment of the glass at 590 deg. C for 2 h in an electric furnace in air. This particle was obtained through the self-powdering behavior in the crystallization of glass. The periodic domain structure is observed. Ferroelastic beta'-Gd{sub 2}(MoO{sub 4}){sub 3} crystals are formed in the particle, and second harmonic generations are detected, depending on the domain structure.

Tsukada, Y.; Honma, T. [Department of Materials Science and Technology, Nagaoka University of Technology, 1603-1 Kamitomioka-cho, Nagaoka 940-2188 (Japan); Komatsu, T., E-mail: komatsu@mst.nagaokaut.ac.j [Department of Materials Science and Technology, Nagaoka University of Technology, 1603-1 Kamitomioka-cho, Nagaoka 940-2188 (Japan)

2009-08-15T23:59:59.000Z

407

Serial optical coherence scanner for brain imaging and mapping  

Science Journals Connector (OSTI)

The serial optical coherence scanner reconstructs macroscopic tissues at microscopic resolution using intrinsic optical contrasts. The anatomy, nerve fiber architectures and fiber...

Akkin, Taner; Wang, Hui

408

Integrated resonant micro-optical gyroscope and method of fabrication  

DOE Patents [OSTI]

An integrated optic gyroscope is disclosed which is based on a photonic integrated circuit (PIC) having a bidirectional laser source, a pair of optical waveguide phase modulators and a pair of waveguide photodetectors. The PIC can be connected to a passive ring resonator formed either as a coil of optical fiber or as a coiled optical waveguide. The lasing output from each end of the bidirectional laser source is phase modulated and directed around the passive ring resonator in two counterpropagating directions, with a portion of the lasing output then being detected to determine a rotation rate for the integrated optical gyroscope. The coiled optical waveguide can be formed on a silicon, glass or quartz substrate with a silicon nitride core and a silica cladding, while the PIC includes a plurality of III V compound semiconductor layers including one or more quantum well layers which are disordered in the phase modulators and to form passive optical waveguides.

Vawter, G. Allen (Albuquerque, NM); Zubrzycki, Walter J. (Sandia Park, NM); Guo, Junpeng (Albuquerque, NM); Sullivan, Charles T. (Albuquerque, NM)

2006-09-12T23:59:59.000Z

409

Cancellation of the Signal Fading for 60 GHz Subcarrier Multiplexed Optical DSB Signal Transmission in Nondispersion Shifted Fiber Using Midway Optical Phase Conjugation  

Science Journals Connector (OSTI)

In millimeter-wave (mm-wave) optical double sideband (DSB) signal transmission systems, the received radio frequency (RF) power fades periodically because of the group velocity...

Sotobayashi, Hideyuki; Kitayama, Ken-ichi

1999-01-01T23:59:59.000Z

410

Graphene-clad tapered fiber: effective nonlinearity and propagation losses  

Science Journals Connector (OSTI)

We derive a pulse propagation equation for a graphene-clad optical fiber, treating the optical response of the graphene and nonlinearity of the dielectric fiber core as perturbations...

Gorbach, A V; Marini, A; Skryabin, D V

2013-01-01T23:59:59.000Z

411

Glass balls  

E-Print Network [OSTI]

There is a building with 100 floors in it, and glass balls, and an integer k with the following property. If one drops a glass ball from the floor number k or higher, ...

412

Spatial optic multiplexer/diplexer  

DOE Patents [OSTI]

An apparatus for simultaneous transmission of optic signals having different wavelengths over a single optic fiber. Multiple light signals are transmitted through optic fibers that are formed into a circumference surrounding a central core fiber. The multiple light signals are directed by a lens into a single receiving fiber where the light combines and is then focused into the central core fiber which transmits the light to a wavelength discriminating receiver assembly.

Tremblay, Paul L. (Idaho Falls, ID)

1991-01-01T23:59:59.000Z

413

Venetian glass  

Science Journals Connector (OSTI)

...a term used for imitation pearl made of hollow, iridescent glass, which is filled with wax to increase...

2009-01-01T23:59:59.000Z

414

Solid oxide fuel cell having a glass composite seal  

DOE Patents [OSTI]

A solid oxide fuel cell stack having a plurality of cassettes and a glass composite seal disposed between the sealing surfaces of adjacent cassettes, thereby joining the cassettes and providing a hermetic seal therebetween. The glass composite seal includes an alkaline earth aluminosilicate (AEAS) glass disposed about a viscous glass such that the AEAS glass retains the viscous glass in a predetermined position between the first and second sealing surfaces. The AEAS glass provides geometric stability to the glass composite seal to maintain the proper distance between the adjacent cassettes while the viscous glass provides for a compliant and self-healing seal. The glass composite seal may include fibers, powders, and/or beads of zirconium oxide, aluminum oxide, yttria-stabilized zirconia (YSZ), or mixtures thereof, to enhance the desirable properties of the glass composite seal.

De Rose, Anthony J.; Mukerjee, Subhasish; Haltiner, Jr., Karl Jacob

2013-04-16T23:59:59.000Z

415

Development of an Integrated Raman and Turbidity Fiber Optic Sensor for the In-Situ Analysis of High Level Nuclear Waste - 13532  

SciTech Connect (OSTI)

Stored nuclear waste must be retrieved from storage, treated, separated into low- and high-level waste streams, and finally put into a disposal form that effectively encapsulates the waste and isolates it from the environment for a long period of time. Before waste retrieval can be done, waste composition needs to be characterized so that proper safety precautions can be implemented during the retrieval process. In addition, there is a need for active monitoring of the dynamic chemistry of the waste during storage since the waste composition can become highly corrosive. This work describes the development of a novel, integrated fiber optic Raman and light scattering probe for in situ use in nuclear waste solutions. The dual Raman and turbidity sensor provides simultaneous chemical identification of nuclear waste as well as information concerning the suspended particles in the waste using a common laser excitation source. (authors)

Gasbarro, Christina; Bello, Job [EIC Laboratories, Inc., 111 Downey St., Norwood, MA, 02062 (United States)] [EIC Laboratories, Inc., 111 Downey St., Norwood, MA, 02062 (United States); Bryan, Samuel; Lines, Amanda; Levitskaia, Tatiana [Pacific Northwest National Laboratory, PO Box 999, Richland, WA, 99352 (United States)] [Pacific Northwest National Laboratory, PO Box 999, Richland, WA, 99352 (United States)

2013-07-01T23:59:59.000Z

416

Fiber optic probe of free electron evanescent fields in the optical frequency range Jin-Kyu So, Kevin F. MacDonald, and Nikolay I. Zheludev  

E-Print Network [OSTI]

, Kevin F. MacDonald, and Nikolay I. Zheludev Citation: Applied Physics Letters 104, 201101 (2014); doi evanescent fields in the optical frequency range Jin-Kyu So,1,a) Kevin F. MacDonald,1 and Nikolay I. Zheludev

Zheludev, Nikolay

417

A Comparative Study on the Type IIA Photosensitivity of a B-Ge Optical Fiber Using Ultraviolet, Femtosecond Radiation  

Science Journals Connector (OSTI)

A comparative study on the Type IIA photosensitivity of a B/Ge-codoped optical fibre is performed using 5ps, 500fs and 120fs, 248nm laser radiation. Index modulation curves and...

Violakis, Georgios; Georgiou, Savas; Konstantaki, Maria; Pissadakis, Stavros

418

Fast-neutron radiation effects in a silica-core optical fiber studied by a CCD-camera spectrometer  

Science Journals Connector (OSTI)

A simple CCD-camera spectrometer was deployed at the Los Alamos Spallation Radiation Effects Facility to characterize fast-neutron irradiation effects in several silica-based optical...

Griscom, D L; Gingerich, M E; Friebele, E J; Putnam, M; Unruh, W

1994-01-01T23:59:59.000Z

419

Large Pitch Hollow Core Honeycomb Fiber  

Science Journals Connector (OSTI)

A new kind of hollow core photonic crystal fiber (HC-PCF) for broadband guidance is introduced. Structural and optical properties of a fabricated example are detailed.

Beaudou, Benoît; Couny, François; Benabid, Fetah; Roberts, Peter John

420

Strong fibers  

SciTech Connect (OSTI)

This program was directed to a new and generic approach to the development of new materials with novel and interesting properties, and to the precision fabrication of these materials in one and two-dimensional forms. Advanced deposition processes and microfabrication technology were used to produce fibers and grids of metals, semiconductors, ceramics, and mixtures of controlled composition and structure, and with new and interesting mechanical and physical properties. Deposition processes included electron beam evaporation, co-deposition of mixtures by dual electron beam evaporation, thermal evaporation, sputtering of a single element or compound, sputtering of a single element in a gaseous atmosphere to produce compounds, plasma enhanced chemical vapor deposition (PECVD), low pressure chemical vapor deposition (LPCVD), and selective tungsten chemical vapor deposition (W-CVD). The approach was to use the deposition processes in coordination with patterns generated by optical lithography to produce fibers with transverse dimensions in the micron range, and lengths from less than a millimeter to several centimeters. The approach is also applicable to the production of two-dimensional grids and particulates of controlled sizes and geometries.

Li, Che-Yu.

1991-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "optical glass fibers" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

A variety of neutron sensors based on scintillating glass waveguides  

SciTech Connect (OSTI)

Pacific Northwest Laboratory (PNL) has fabricated cerium-activated, lithium-silicate glass scintillating fiber neutron sensors via a hot-downdraw process. These fibers typically have a transmission length (e{sup {minus}1} length) of greater than 2 meters. The underlying physics of, the properties of, and selected devices incorporating these fibers are described. These fibers constitute an enabling technology for a wide variety of neutron sensors.

Bliss, M.; Craig, R.A.

1995-05-01T23:59:59.000Z

422

Glasstech. Ber. Glass Sci. Technol. 75 C2 (2002) 298 Photoinduced Chemical Etching of Silicate and Borosilicate Glasses  

E-Print Network [OSTI]

Glasstech. Ber. Glass Sci. Technol. 75 C2 (2002) 298 Photoinduced Chemical Etching of Silicate and Borosilicate Glasses Leonid B. Glebov, Larissa Glebova and Olena Lopatiuk School of Optics/CREOL, University modification of glasses for electronic applications [1]. Main disadvantage of using this method for optical

Glebov, Leon

423

Role of point defects in the photosensitivity of hydrogen-loaded phosphosilicate glass  

SciTech Connect (OSTI)

It is shown that point defect modifications in hydrogen-loaded phosphosilicate glass (PSG) do not play a central role in determining its photosensitivity. Photochemical reactions that involve a two-step point defect modification and pre-exposure effect are incapable of accounting for photoinduced refractive index changes. It seems likely that a key role in UV-induced refractive index modifications is played by structural changes in the PSG network. Experimental data are presented that demonstrate intricate network rearrangement dynamics during UV exposure of PSG. (fiber optics)

Larionov, Yu V [A M Prokhorov General Physics Institute, Russian Academy of Sciences, Moscow (Russian Federation)

2010-08-03T23:59:59.000Z

424

Classification of oxide glasses: A polarizability approach  

SciTech Connect (OSTI)

A classification of binary oxide glasses has been proposed taking into account the values obtained on their refractive index-based oxide ion polarizability {alpha}{sub O2-}(n{sub 0}), optical basicity {lambda}(n{sub 0}), metallization criterion M(n{sub 0}), interaction parameter A(n{sub 0}), and ion's effective charges as well as O1s and metal binding energies determined by XPS. Four groups of oxide glasses have been established: glasses formed by two glass-forming acidic oxides; glasses formed by glass-forming acidic oxide and modifier's basic oxide; glasses formed by glass-forming acidic and conditional glass-forming basic oxide; glasses formed by two basic oxides. The role of electronic ion polarizability in chemical bonding of oxide glasses has been also estimated. Good agreement has been found with the previous results concerning classification of simple oxides. The results obtained probably provide good basis for prediction of type of bonding in oxide glasses on the basis of refractive index as well as for prediction of new nonlinear optical materials.

Dimitrov, Vesselin [Department of Silicate Technology, University of Chemical Technology and Metallurgy, 8 Kl. Ohridski Blvd., Sofia 1756 (Bulgaria); Komatsu, Takayuki [Department of Chemistry, The Nagaoka University of Technology, 1603-1 Kamitomioka-cho, Nagaoka-shi, Niigata-ken 940-2188 (Japan)]. E-mail: komatsu@chem.nagaokaut.ac.jp

2005-03-15T23:59:59.000Z

425

Glass Structure  

Science Journals Connector (OSTI)

... Structure and Crystallization of Glasses. By WernerVogel. Pp. 246. (Pergamon: Oxford and New York, October 1971. ... account of the experimental work on liquid-liquid separation and nucleation and crystal growth in glasses carried out by the author and his colleagues in the laboratories of VEB Jena ...

R. W. DOUGLAS

1972-04-07T23:59:59.000Z

426

Glass Technology  

Science Journals Connector (OSTI)

... WE have received from the Department of Glass Technology, University of Sheffield, a copy of vol. ii. of “Experimental Researches ... that department. The papers included have already appeared in the Journal of the Society of Glass Technology. They range over a somewhat wide field of the ...

1920-08-23T23:59:59.000Z

427

Tempered Glass  

Science Journals Connector (OSTI)

... year (NATURE, vol. xxxi. p. 7). It consists in the production of glass which appears to be of a very homogeneous character and of considerable strength and hardness ... which we propose to refer shortly, is that of keeping the whole body of the glass at a uniform temperature during the operations of heating and cooling—that is to say ...

1885-03-05T23:59:59.000Z

428

Photonic Crystal Fibers Advances in Fiber Optics  

E-Print Network [OSTI]

susceptible to electromagnetic interference (EMI) from signals on neighbouring lines. From a speed perspective

La Rosa, Andres H.

429

Delamination and Failure at Ply Drops in Carbon Fiber Laminates Under Static and Fatigue Loading  

E-Print Network [OSTI]

Delamination and Failure at Ply Drops in Carbon Fiber Laminates Under Static and Fatigue Loading in composites with thickness tapering has been a major concern in aerospace applications of carbon fibers, where carbon fiber and glass fiber prepreg laminates containing various ply drop geometries, and using thicker

430

Granularity and Inhomogeneity Are the Joint Generators of Optical Rogue Waves  

Science Journals Connector (OSTI)

In the presence of many waves, giant events can occur with a probability higher than expected for random dynamics. By studying linear light propagation in a glass fiber, we show that optical rogue waves originate from two key ingredients: granularity, or a minimal size of the light speckles at the fiber exit, and inhomogeneity, that is, speckles clustering into separate domains with different average intensities. These two features characterize also rogue waves in nonlinear systems; thus, nonlinearity just plays the role of bringing forth the two ingredients of granularity and inhomogeneity.

F. T. Arecchi; U. Bortolozzo; A. Montina; S. Residori

2011-04-15T23:59:59.000Z

431

Latching micro optical switch  

DOE Patents [OSTI]

An optical switch reliably maintains its on or off state even when subjected to environments where the switch is bumped or otherwise moved. In addition, the optical switch maintains its on or off state indefinitely without requiring external power. External power is used only to transition the switch from one state to the other. The optical switch is configured with a fixed optical fiber and a movable optical fiber. The movable optical fiber is guided by various actuators in conjunction with a latching mechanism that configure the switch in one position that corresponds to the on state and in another position that corresponds to the off state.

Garcia, Ernest J; Polosky, Marc A

2013-05-21T23:59:59.000Z

432

Chalcogenide glass nanostructures  

DOE Patents [OSTI]

Chalcogenide nanowires and other micro-and nano scale structures are grown on a preselected portion of on a substrate. They are amorphous and of uniform composition and can be grown by a sublimation-condensation process onto the surface of an amorphous substrate. Among other uses, these structures can be used as coatings on optical fibers, as coatings on implants, as wispering galleries, in electrochemical devices, and in nanolasers.

Johnson, Bradley R. (Richland, WA); Schweiger, Michael J. (Richland, WA); MacIsaac, Brett D. (Kennewick, WA); Sundaram, S. Kamakshi (Richland, WA)

2007-05-01T23:59:59.000Z

433

The effect of moisture on a glass/epoxy composite  

E-Print Network [OSTI]

Research was done to determine the effect of moisture on the transverse tensile strength and the interfacial shear strength of a glass/epoxy composite. Specimens with two different fiber sizings, one epoxy compatible and one vinyl-ester compatible...

Chatawanich, Candy Suda

2012-06-07T23:59:59.000Z

434

Combining NASA/JPL One-Way Optical-Fiber Light-Speed Data with Spacecraft Earth-Flyby Doppler-Shift Data to Characterise 3-Space Flow  

E-Print Network [OSTI]

We combine data from two high precision NASA/JPL experiments: (i) the one-way speed of light experiment using optical fibers: Krisher T.P., Maleki L., Lutes G.F., Primas L.E., Logan R.T., Anderson J.D. and Will C.M., Phys. Rev. D, vol 42, 731-734, 1990, and (ii) the spacecraft earth-flyby doppler shift data: Anderson J.D., Campbell J.K., Ekelund J.E., Ellis J. and Jordan J.F., Phys. Rev. Lett., vol 100, 091102, 2008, to give the solar-system galactic 3-space average speed of 486km/s in the direction RA=4.29hrs, Dec=-75.0deg. Turbulence effects (gravitational waves) are also evident. Data also reveals the 30km/s orbital speed of the earth and the sun inflow component at 1AU of 42km/s and also 615km/s near the sun, and for the first time, experimental measurement of the 3-space 11.2km/s inflow of the earth. The NASA/JPL data is in remarkable agreement with that determined in other light speed anisotropy experiments, such as Michelson-Morley (1887), Miller (1933), Torr and Kolen (1981), DeWitte (1991), Cahill (2006), Munera (2007), Cahill and Stokes (2008) and Cahill (2009).

Reginald T Cahill

2009-06-30T23:59:59.000Z

435

The morphological and chemical characteristics of respirable mineral wool fibers  

E-Print Network [OSTI]

glass-plastic dust were published between 1955 and 1959, All four papers reported that fiber glass dust caused no 15-18 fibrosis in rats, guinea pigs, rabbi ts, and monkeys that inhaled or were injected intratracheally with the dust. However... reported that an1mal inhalation experiments using rats and 24 hamsters exposed to f1brous glass concentrat1ons of approximately 100 milligrams per cubic meter (mg/m ) for 24 months, had shown that 3 fibrous glass fibers were not cytotoxic...

Butler, Donnie Ray

2012-06-07T23:59:59.000Z

436

Automated fiber pigtailing machine  

DOE Patents [OSTI]

The Automated Fiber Pigtailing Machine (AFPM) aligns and attaches optical fibers to optoelectronic (OE) devices such as laser diodes, photodiodes, and waveguide devices without operator intervention. The so-called pigtailing process is completed with sub-micron accuracies in less than 3 minutes. The AFPM operates unattended for one hour, is modular in design and is compatible with a mass production manufacturing environment. This machine can be used to build components which are used in military aircraft navigation systems, computer systems, communications systems and in the construction of diagnostics and experimental systems. 26 figs.

Strand, O.T.; Lowry, M.E.

1999-01-05T23:59:59.000Z

437

Optical Packet Switching -1 Optical Networks  

E-Print Network [OSTI]

Optical Packet Switching - 1 Optical Networks: from fiber transmission to photonic switching Optical Packet Switching Fabio Neri and Marco Mellia TLC Networks Group ­ Electronics Department e.mellia@polito.it ­ tel. 011 564 4173 #12;Optical Packet Switching - 2 · This work is licensed under the Creative Commons

Mellia, Marco

438

Glass | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

industry sectors. Industrial Glass Bandwidth Analysis (2007) Documents for historical reference Energy and Environmental Profile of the Glass Industry (2002) Glass Industry...

439

Through a glass darkly  

E-Print Network [OSTI]

Closeup Through a glass darklyThrough a glass darkly James E. Hall Keywords: AKAP2; AQP0;Medicine Closeup Through a glass darkly GLUT1 Glucose

Hall, James E

2012-01-01T23:59:59.000Z

440

Optics  

Science Journals Connector (OSTI)

Optical components such as lenses, mirrors and diffraction gratings are widely used in many inspection systems. These include not only those for visual inspection with CCD cameras, but also in areas of distanc...

C. Loughlin

1993-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "optical glass fibers" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

March 15, 1989 / Vol. 14, No. 6 / OPTICS LETTERS 317 Picosecond pump-probe interferometric measurement of optical  

E-Print Network [OSTI]

fiber doped with CdS.,Seli, semiconductor nanocrystals exhibits a large optically induced phase shift measurement of optical nonlinearity in semiconductor-doped fibers D. Cotter, C.N. Ironside,* B. J. Ainslie- surements on silica optical fibers and also on semicon- ductor-doped fibers; the latter exhibit large

442

Quantum Enabled Security (QES) for Optical Communications  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

integrated with optical communications to provide a strong, innate, security foundation at the photonic layer for optical fiber networks. July 10, 2013 Quantum Enabled...

443

A photo-stable chalcogenide glass  

Science Journals Connector (OSTI)

Photo-darkening and photo-bleaching are well known phenomena in As-Se and Ge-Se chalcogenide glasses, respectively. Consequently, a systematic dependence of photo-induced optical...

Yang, Guang; Jain, Himanshu; Ganjoo, Ashtosh; Zhao, Donghui; Xu, Yinsheng; Zeng, Huidan; Chen, Guorong

2008-01-01T23:59:59.000Z

444

Ultrafast supercontinuum fiber-laser based pump-probe scanning magneto-optical Kerr effect microscope for the investigation of electron spin dynamics in semiconductors at cryogenic temperatures with picosecond time and micrometer spatial resolution  

SciTech Connect (OSTI)

We describe a two-color pump-probe scanning magneto-optical Kerr effect microscope which we have developed to investigate electron spin phenomena in semiconductors at cryogenic temperatures with picosecond time and micrometer spatial resolution. The key innovation of our microscope is the usage of an ultrafast “white light” supercontinuum fiber-laser source which provides access to the whole visible and near-infrared spectral range. Our Kerr microscope allows for the independent selection of the excitation and detection energy while avoiding the necessity to synchronize the pulse trains of two separate picosecond laser systems. The ability to independently tune the pump and probe wavelength enables the investigation of the influence of excitation energy on the optically induced electron spin dynamics in semiconductors. We demonstrate picosecond real-space imaging of the diffusive expansion of optically excited electron spin packets in a (110) GaAs quantum well sample to illustrate the capabilities of the instrument.

Henn, T.; Kiessling, T., E-mail: tobias.kiessling@physik.uni-wuerzburg.de; Ossau, W.; Molenkamp, L. W. [Physikalisches Institut (EP3), Universität Würzburg, 97074 Würzburg (Germany)] [Physikalisches Institut (EP3), Universität Würzburg, 97074 Würzburg (Germany); Biermann, K.; Santos, P. V. [Paul-Drude-Institut für Festkörperelektronik, 10117 Berlin (Germany)] [Paul-Drude-Institut für Festkörperelektronik, 10117 Berlin (Germany)

2013-12-15T23:59:59.000Z

445

Laser Cooled High-Power Fiber Amplifier  

E-Print Network [OSTI]

A theoretical model for laser cooled continuous-wave fiber amplifier is presented. The amplification process takes place in the Tm3+-doped core of the fluoride ZBLAN (ZrF4-BaF2-LaF3-AlF3-NaF) glass fiber. The cooling process takes place in the Yb3+:ZBLAN fiber cladding. It is shown that for each value of the pump power and the amplified signal there is a distribution of the concentration of the Tm3+ along the length of the fiber amplifier, which provides its athermal operation. The influence of a small deviation in the value of the amplified signal on the temperature of the fiber with the fixed distribution of the Tm3+ions in the fiber cladding is investigated.

Nemova, Galina

2009-01-01T23:59:59.000Z

446

Nanodiamond in tellurite glass Part I: origin of loss in nanodiamond-doped glass  

E-Print Network [OSTI]

Tellurite glass fibers with embedded nanodiamond are attractive materials for quantum photonic applications. Reducing the loss of these fibers in the 600-800 nm wavelength range of nanodiamond fluorescence is essential to exploit the unique properties of nanodiamond in the new hybrid material. In the first part of this study, we report the effect of interaction of the tellurite glass melt with the embedded nanodiamond on the loss of the glasses. The glass fabrication conditions such as melting temperature and concentration of NDs added to the melt were found to have critical influence on the interaction. Based on this understanding, we identified promising fabrication conditions for decreasing the loss to levels required for practical applications.

Ebendorff-Heidepriem, Heike; Ji, Hong; Greentree, Andrew D; Gibson, Brant C; Monro, Tanya M

2014-01-01T23:59:59.000Z

447

5D Data Storage by Ultrafast Laser Nanostructuring in Glass  

E-Print Network [OSTI]

5D Data Storage by Ultrafast Laser Nanostructuring in Glass Jingyu Zhang* , Mindaugas Gecevicius-assembled form birefringence and retrieved in glass opening the era of unlimited lifetime data storage. © 2013 laser writing in glass were proposed for the polarization multiplexed optical memory, where

Anderson, Jim

448

Enhanced quantum yield of yellow photoluminescence of Dy{sup 3+} ions in nonlinear optical Ba{sub 2}TiSi{sub 2}O{sub 8} nanocrystals formed in glass  

SciTech Connect (OSTI)

Transparent crystallized glasses consisting of nonlinear optical Ba{sub 2}TiSi{sub 2}O{sub 8} nanocrystals (diameter: {approx}100 nm) are prepared through the crystallization of 40BaO-20TiO{sub 2}-40SiO{sub 2}-0.5Dy{sub 2}O{sub 3} glass (in the molar ratio), and photoluminescence quantum yields of Dy{sup 3+} ions in the visible region are evaluated directly by using a photoluminescence spectrometer with an integrating sphere. The incorporation of Dy{sup 3+} ions into Ba{sub 2}TiSi{sub 2}O{sub 8} nanocrystals is confirmed from the X-ray diffraction analyses. The total quantum yields of the emissions at the bands of {sup 4}F{sub 9/2}{yields}{sup 6}H{sub 15/2} (blue: 484 nm), {sup 4}F{sub 9/2}{yields}{sup 6}H{sub 13/2} (yellow: 575 nm), and {sup 4}F{sub 9/2}{yields}{sup 6}H{sub 11/2} (red: 669 nm) in the crystallized glasses are {approx}15%, being about four times larger compared with the precursor glass. It is found that the intensity of yellow (575 nm) emissions and the branching ratio of the yellow (575 nm)/blue (484 nm) intensity ratio increase largely due to the crystallization. It is suggested from Judd-Ofelt analyses that the site symmetry of Dy{sup 3+} ions in the crystallized glasses is largely distorted, giving a large increase in the yellow emissions. It is proposed that Dy{sup 3+} ions substitute Ba{sup 2+} sites in Ba{sub 2}TiSi{sub 2}O{sub 8} nanocrystals. - Grapical abstract: This figure shows the photoluminescence spectra of Dy{sup 3+} ions in the range of 450-700 nm obtained in the quantum field measurements for the precursor BTS and crystallized (at 770 and 790 deg. C, for 30 min) glasses. The wavelength of the excitation light was 352 nm. By incorporating into Ba{sub 2}TiSi{sub 2}O{sub 8} nanocrystals, the emission intensity of the yellow band of Dy{sup 3+} ions is largely enhanced. This would give an impact in the science and technology of photoluminescence materials.

Maruyama, N.; Honma, T. [Department of Materials Science and Technology, Nagaoka University of Technology, 1603-1 Kamitomioka-cho, Nagaoka 940-2188 (Japan); Komatsu, T. [Department of Materials Science and Technology, Nagaoka University of Technology, 1603-1 Kamitomioka-cho, Nagaoka 940-2188 (Japan)], E-mail: komatsu@mst.nagaokaut.ac.jp

2009-02-15T23:59:59.000Z

449

Fiber-type dosimeter with improved illuminator  

DOE Patents [OSTI]

A single-piece, molded plastic, Cassigrainian-type condenser arrangement is incorporated in a tubular-shaped personal pocket dosimeter of the type which combines an ionization chamber with an optically-read fiber electrometer to provide improved illumination of the electrometer fiber. The condenser routes incoming light from one end of the dosimeter tubular housing around a central axis charging pin assembly and focuses the light at low angles to the axis so that it falls within the acceptance angle of the electrometer fiber objective lens viewed through an eyepiece lens disposed in the opposite end of the dosimeter. This results in improved fiber illumination and fiber image contrast.

Fox, Richard J. (Oak Ridge, TN)

1987-01-01T23:59:59.000Z

450

Fiber-type dosimeter with improved illuminator  

DOE Patents [OSTI]

A single-piece, molded plastic, Cassigrainian-type condenser arrangement is incorporated in a tubular-shaped personal pocket dosimeter of the type which combines an ionization chamber with an optically-read fiber electrometer to provide improved illumination of the electrometer fiber. The condenser routes incoming light from one end of the dosimeter tubular housing around a central axis charging pin assembly and focuses the light at low angles to the axis so that it falls within the acceptance angle of the electrometer fiber objective lens viewed through an eyepiece lens disposed in the opposite end of the dosimeter. This results in improved fiber illumination and fiber image contrast.

Fox, R.J.

1985-12-23T23:59:59.000Z

451

Coated glass in the automotive industry  

Science Journals Connector (OSTI)

Inorganic coatings on glasses have reached the level where they will certainly be applied in the automotive industry in order to solve such glazing problems as heat load, heat loss, glare, UV adsorption, disturbed reflections, electromagnetic influence and thermal insulation. Their widespread use will depend on optimising the solution to problems of solar control and heatable glasses while the glass is also capable of the other functions required of it, thus justifying the relatively high cost that is predicted. There remain unsolved problems in optical limits and colour matching. When these are solved solar control glasses are likely to give real advantages in terms of air conditioning and comfort, and heatable glasses will be used in association with electrical power for demisting and deicing. Particular attention is being directed to a class of infrared reflecting and heatable glasses, obtained by selectively coating transparent plastic films that are embedded or bonded in laminated or tempered glasses. Fabricating this type of glasses has mainly been useful for two reasons: (I) to develop versatile techniques to make solar control IR reflecting and heatable glasses for all kinds and dimensions of vehicle glazing; and (2) to assess whether these glasses are really feasible alternatives to directly coated glasses. This paper describes results of some solar control experiments in Fiat cars: to ascertain the actual internal temperature differences found when glazing vehicles with the absorbing and reflecting IR glasses currently available; and to obtain results with a similar purpose using heatable glasses. There is also discussion of how the glasses could be used in glazing all or parts of a car's windows / especially addressing problems of glare. Suggestions are made of the directions of this research in the future.

G. Manfre

1991-01-01T23:59:59.000Z

452

Determining the effect of seawater on the interfacial shear strength of fiber reinforced epoxies using the single fiber fragmentation test  

E-Print Network [OSTI]

of fiber reinforced polymer composite materials. The single fiber fragmentation test (SFFT) and Kelly-Tyson shear lag analysis were used to evaluate the effect of seawater on the interfacial shear strength (IFSS) of carbon/epoxy and glass/epoxy composite...

Pratt, Barbara Ann

1996-01-01T23:59:59.000Z

453

Power scaling analysis of fiber lasers and amplifiers based on non-silica materials  

SciTech Connect (OSTI)

A developed formalism for analyzing the power scaling of diffraction limited fiber lasers and amplifiers is applied to a wider range of materials. Limits considered include thermal rupture, thermal lensing, melting of the core, stimulated Raman scattering, stimulated Brillouin scattering, optical damage, bend induced limits on core diameter and limits to coupling of pump diode light into the fiber. For conventional fiber lasers based upon silica, the single aperture, diffraction limited power limit was found to be 36.6kW. This is a hard upper limit that results from an interaction of the stimulated Raman scattering with thermal lensing. This result is dependent only upon physical constants of the material and is independent of the core diameter or fiber length. Other materials will have different results both in terms of ultimate power out and which of the many limits is the determining factor in the results. Materials considered include silica doped with Tm and Er, YAG and YAG based ceramics and Yb doped phosphate glass. Pros and cons of the various materials and their current state of development will be assessed. In particular the impact of excess background loss on laser efficiency is discussed.

Dawson, J W; Messerly, M J; Heebner, J E; Pax, P H; Sridharan, A K; Bullington, A L; Beach, R J; Siders, C W; Barty, C P; Dubinskii, M

2010-03-30T23:59:59.000Z

454

Fiber to waveguide couplers for silicon photonics  

E-Print Network [OSTI]

As silicon photonics enters mainstream technology, we find ourselves in need of methods to seamlessly transfer light between the optical fibers of global scale telecommunications networks and the on-chip waveguides used ...

Montalbo, Trisha M., 1980-

2004-01-01T23:59:59.000Z

455

Carbon Fiber  

ScienceCinema (OSTI)

Lee McGetrick leads ORNL's effort to produce light, durable carbon fiber at lower cost -- a key to improvements in manufacturing that will produce more fuel-efficient vehicles and other advances.

McGetrick, Lee

2014-07-23T23:59:59.000Z

456

Carbon Fiber  

SciTech Connect (OSTI)

Lee McGetrick leads ORNL's effort to produce light, durable carbon fiber at lower cost -- a key to improvements in manufacturing that will produce more fuel-efficient vehicles and other advances.

McGetrick, Lee

2014-04-17T23:59:59.000Z

457

Fiber Bundles  

Science Journals Connector (OSTI)

Fiber bundles, their morphisms and sections are defined. Transition functions are introduced and used to describe the global structure of a bundle and to build it out of local data. Particular clas...

Lorenzo Fatibene; Mauro Francaviglia

2003-01-01T23:59:59.000Z

458

Quantum Enabled Security (QES) for Optical Communications  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Quantum Enabled Security (QES) for Optical Communications Quantum Enabled Security (QES) for Optical Communications Quantum Enabled Security (QES) for Optical Communications Los Alamos National Laboratory has developed Quantum Enabled Security (QES), a revolutionary new cybersecurity capability using quantum (single-photon) communications integrated with optical communications to provide a strong, innate, security foundation at the photonic layer for optical fiber networks. July 10, 2013 Quantum Enabled Security (QES) for Optical Communications Available for thumbnail of Feynman Center (505) 665-9090 Email Quantum Enabled Security (QES) for Optical Communications Applications: Secure communication over optical or free space networks Financial networks Transparent access networks: fiber to the home (FTTH); fiber to the

459

A World of Glass  

Science Journals Connector (OSTI)

...This clear molten liquid began to transform agriculture and horticulture. The use of glass houses to promote the precocious growth...enclosed coaches, watch-glasses, lighthouses, and street lighting. The sextant required glass, and the precision chronometer...

Alan Macfarlane; Gerry Martin

2004-09-03T23:59:59.000Z

460

A World of Glass  

Science Journals Connector (OSTI)

...transform agriculture and horticulture. The use of glass houses...appeared. Glass cloches and greenhouses improved the cultivation...lighthouses, and street lighting. The sextant required glass...lanterns, lighthouses, and greenhouses, and finally through cameras...

Alan Macfarlane; Gerry Martin

2004-09-03T23:59:59.000Z

Note: This page contains sample records for the topic "optical glass fibers" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

Plastic Flow in Glass  

Science Journals Connector (OSTI)

...1964 research-article Plastic Flow in Glass D. M. Marsh The classical brittle fracture...account for the mechanical properties of glasses, but the widespread evidence of plastic flow in all glass fracture phenomena even at room temperature...

1964-01-01T23:59:59.000Z

462

Package for integrated optic circuit and method  

DOE Patents [OSTI]

A structure and method for packaging an integrated optic circuit. The package comprises a first wall having a plurality of microlenses formed therein to establish channels of optical communication with an integrated optic circuit within the package. A first registration pattern is provided on an inside surface of one of the walls of the package for alignment and attachment of the integrated optic circuit. The package in one embodiment may further comprise a fiber holder for aligning and attaching a plurality of optical fibers to the package and extending the channels of optical communication to the fibers outside the package. In another embodiment, a fiber holder may be used to hold the fibers and align the fibers to the package. The fiber holder may be detachably connected to the package.

Kravitz, Stanley H. (26 Aspen Rd., Placitas, NM 87043); Hadley, G. Ronald (6012 Annapolis NE., Albuquerque, NM 87111); Warren, Mial E. (3825 Mary Ellen NE., Albuquerque, NM 87111); Carson, Richard F. (1036 Jewel Pl. NE., Albuquerque, NM 87123); Armendariz, Marcelino G. (1023 Oro Real NE., Albuquerque, NM 87123)

1998-01-01T23:59:59.000Z

463

Package for integrated optic circuit and method  

DOE Patents [OSTI]

A structure and method are disclosed for packaging an integrated optic circuit. The package comprises a first wall having a plurality of microlenses formed therein to establish channels of optical communication with an integrated optic circuit within the package. A first registration pattern is provided on an inside surface of one of the walls of the package for alignment and attachment of the integrated optic circuit. The package in one embodiment may further comprise a fiber holder for aligning and attaching a plurality of optical fibers to the package and extending the channels of optical communication to the fibers outside the package. In another embodiment, a fiber holder may be used to hold the fibers and align the fibers to the package. The fiber holder may be detachably connected to the package. 6 figs.

Kravitz, S.H.; Hadley, G.R.; Warren, M.E.; Carson, R.F.; Armendariz, M.G.

1998-08-04T23:59:59.000Z

464

Microsoft Word - Bell-BoundaryFiber_CX_2013  

Broader source: Energy.gov (indexed) [DOE]

Amanda Williams Amanda Williams Project Manager - TEP-TPP-3 Proposed Action: Bell-Boundary Fiber Project Categorical Exclusion Applied (from Subpart D, 10 C.F.R. Part 1021): B4.7 - Fiber optic cable Location: Spokane and Pend Orielle counties, WA Proposed by: Bonneville Power Administration (BPA) Description of the Proposed Action: BPA is proposing to install new fiber optic line along 90 miles of existing BPA transmission lines in Spokane and Pend Orielle counties in Washington (see Figure 1). It would extend from Bell Substation in Spokane, WA to Boundary Substation 8 miles north of Metaline Falls, WA. The fiber would be strung on the Bell-Boundary No. 1 transmission line and run through Sacheen and Cusick substations along the route. BPA would install overhead fiber optic cable on existing towers or on fiber optic wood poles where

465

CRYSTALLIZATION IN MULTICOMPONENT GLASSES  

SciTech Connect (OSTI)

In glass processing situations involving glass crystallization, various crystalline forms nucleate, grow, and dissolve, typically in a nonuniform temperature field of molten glass subjected to convection. Nuclear waste glasses are remarkable examples of multicomponent vitrified mixtures involving partial crystallization. In the glass melter, crystals form and dissolve during batch-to-glass conversion, melter processing, and product cooling. Crystals often agglomerate and sink, and they may settle at the melter bottom. Within the body of cooling glass, multiple phases crystallize in a non-uniform time-dependent temperature field. Self-organizing periodic distribution (the Liesegnang effect) is common. Various crystallization phenomena that occur in glass making are reviewed.

KRUGER AA; HRMA PR

2009-10-08T23:59:59.000Z

466

NEWS & VIEWS Glass dynamics  

E-Print Network [OSTI]

NEWS & VIEWS Glass dynamics Diverging views on glass transition Gregory B. mc.mckenna@ttu.edu T he glass transition is one of the most intriguing phenomena in the world of soft condensed matter. Despite decades of study, many aspects of the behaviour of glass-forming liquids remain elusive

Weeks, Eric R.

467

Fabrication of microfluidics structures on different glasses by simplified imprinting technique  

Science Journals Connector (OSTI)

Imprinting technique is an efficient method for fabricating microstructures for microfluidics and lab-on-chip applications. However such technique is not commonly used for glass based microstructures fabrication. In this study, microstructures were transferred completely and successfully from a nickel alloy stamp to different glasses such as sodalime glass, Pyrex glass, SGBN glass and magneto optical glasses, using imprinting technique. Furthermore, the traditional vacuum hot press for imprinting was replaced with the conventional electric furnace which increases the cost efficiency and simplicity greatly. Using specific mold in the conventional furnace, the mass production of microstructured glass chips can be realized.

Qiuping Chen; Qiuling Chen; Gabriele Maccioni

2013-01-01T23:59:59.000Z

468

Glass Cookware Safety  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Glass Cookware Safety Glass Cookware Safety Under the wrong conditions, glass cookware can crack, break or shatter. Glass cookware is tempered (heat resistant). However, there are many steps to follow to ensure safe use of glass cookware. Glass Cookware Steps: If the steps are not followed, glass cookware can shatter unexpectedly. shatters, (it looks as if it has exploded) If glass bakeware is chipped, cracked, or scratched, it's time for it to be retired from service. It is more likely to shatter! Don't take glass bakeware directly from the freezer to the oven, or vice versa. Allow the oven to fully preheat before putting glassware inside. Don't add liquid to glassware that is already hot. Cover the bottom of glass bakeware with liquid before cooking meat or vegetables.

469

Measurement of Thermal Dependencies of PBG Fiber Properties  

SciTech Connect (OSTI)

Photonic crystal fibers (PCFs) represent a class of optical fibers which have a wide spectrum of applications in the telecom and sensing industries. Currently, the Advanced Accelerator Research Department at SLAC is developing photonic bandgap particle accelerators, which are photonic crystal structures with a central defect used to accelerate electrons and achieve high longitudinal electric fields. Extremely compact and less costly than the traditional accelerators, these structures can support higher accelerating gradients and will open a new era in high energy physics as well as other fields of science. Based on direct laser acceleration in dielectric materials, the so called photonic band gap accelerators will benefit from mature laser and semiconductor industries. One of the key elements to direct laser acceleration in hollow core PCFs, is maintaining thermal and structural stability. Previous simulations demonstrate that accelerating modes are sensitive to the geometry of the defect region and the variations in the effective index. Unlike the telecom modes (for which over 95% of the energy propagates in the hollow core) most of the power of these modes is located in the glass at the periphery of the central hole which has a higher thermal constant than air ({gamma}{sub SiO{sub 2}} = 1.19 x 10{sup -6} 1/K, {gamma}{sub air} = -9 x 10{sup -7} 1/K with {gamma} = dn/dT). To fully control laser driven acceleration, we need to evaluate the thermal and structural consequences of such modes on the PCFs. We are conducting series of interferometric tests to quantify the dependencies of the HC-633-02 (NKT Photonics) propagation constant (k{sub z}) on temperature, vibration amplitude, stress and electric field strength. In this paper we will present the theoretical principles characterizing the thermal behavior of a PCF, the measurements realized for the fundamental telecom mode (TE{sub 00}), and the experimental demonstration of TM-like mode propagation in the HC-633-02 fiber.

Laouar, Rachik

2011-07-06T23:59:59.000Z

470

Crystallization of niobium germanosilicate glasses  

SciTech Connect (OSTI)

Niobium germanosilicate glasses are potential candidates for the fabrication of transparent glass ceramics with interesting non-linear optical properties. A series of glasses in the (Ge,Si)O{sub 2}-Nb{sub 2}O{sub 5}-K{sub 2}O system were prepared by melting and casting and their characteristic temperatures were determined by differential thermal analysis. Progressive replacement of GeO{sub 2} by SiO{sub 2} improved the thermal stability of the glasses. Depending on the composition and the crystallization heat-treatment, different nanocrystalline phases-KNbSi{sub 2}O{sub 7}, K{sub 3}Nb{sub 3}Si{sub 2}O{sub 13} and K{sub 3.8}Nb{sub 5}Ge{sub 3}O{sub 20.4} could be obtained. The identification and characterization of these phases were performed by X-ray diffraction and Raman spectroscopy. The 40 GeO{sub 2}-10 SiO{sub 2}-25 Nb{sub 2}O{sub 5}-25 K{sub 2}O (mol%) composition presented the higher ability for volume crystallization and its nucleation temperature was determined by the Marotta's method. An activation energy for crystal growth of {approx}529 kJ/mol and a nucleation rate of 9.7x10{sup 18} m{sup -3} s{sup -1} was obtained, for this composition. Transparent glass ceramics with a crystalline volume fraction of {approx}57% were obtained after a 2 h heat-treatment at the nucleation temperature, with crystallite sizes of {approx}20 nm as determined by transmission electron microscopy. - Abstract: TEM image and XRD pattern of the glass ceramic produced (circles indicate nanocrystals).

Santos, Rodrigo [Departamento de Engenharia de Materiais/ICEMS, Instituto Superior Tecnico/TU Lisbon, Av. Rovisco Pais, 1, 1049-001 Lisbon (Portugal); Santos, Luis F., E-mail: luis.santos@ist.utl.p [Departamento de Engenharia de Materiais/ICEMS, Instituto Superior Tecnico/TU Lisbon, Av. Rovisco Pais, 1, 1049-001 Lisbon (Portugal); Almeida, Rui M. [Departamento de Engenharia de Materiais/ICEMS, Instituto Superior Tecnico/TU Lisbon, Av. Rovisco Pais, 1, 1049-001 Lisbon (Portugal); Deubener, Joachim [Institute of Non-Metallic Materials, Clausthal University of Technology, Clausthal-Zellerfeld (Germany); Wondraczek, Lothar [Department of Materials Science, Glass and Ceramics, University of Erlangen-Nuremberg, 91058 Erlangen (Germany)

2010-01-15T23:59:59.000Z

471

On the sub-band gap optical absorption in heat treated cadmium sulphide thin film deposited on glass by chemical bath deposition technique  

SciTech Connect (OSTI)

The sub-band gap optical absorption in chemical bath deposited cadmium sulphide thin films annealed at different temperatures has been critically analyzed with special reference to Urbach relation. It has been found that the absorption co-efficient of the material in the sub-band gap region is nearly constant up to a certain critical value of the photon energy. However, as the photon energy exceeds the critical value, the absorption coefficient increases exponentially indicating the dominance of Urbach rule. The absorption coefficients in the constant absorption region and the Urbach region have been found to be sensitive to annealing temperature. A critical examination of the temperature dependence of the absorption coefficient indicates two different kinds of optical transitions to be operative in the sub-band gap region. After a careful analyses of SEM images, energy dispersive x-ray spectra, and the dc current-voltage characteristics, we conclude that the absorption spectra in the sub-band gap domain is possibly associated with optical transition processes involving deep levels and the grain boundary states of the material.

Chattopadhyay, P.; Karim, B.; Guha Roy, S. [Department of Electronic Science, University of Calcutta, 92, A.P.C. Road, Kolkata 700009 (India)

2013-12-28T23:59:59.000Z

472

ITP Glass: Industrial Glass Bandwidth Analysis Final Report,...  

Broader source: Energy.gov (indexed) [DOE]

Industrial Glass Bandwidth Analysis Final Report, August 2007 ITP Glass: Industrial Glass Bandwidth Analysis Final Report, August 2007 industrialbandwidth.pdf More Documents &...

473

Carbon Fiber Consortium | Partnerships | ORNL  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Carbon Fiber Consortium SHARE Carbon Fiber Consortium Oak Ridge Carbon Fiber Composites Consortium The Oak Ridge Carbon Fiber Composites Consortium was established in 2011 to...

474

Science, Optics and You: Microscopes and Crystals  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

glass), and the field microscope. (The hand lens and field microscope are in your Science, Optics and You package.) Activity 14 provides instructions for making different...

475

Metal nano-strip optical resonators  

Science Journals Connector (OSTI)

Rectangular gold and silver nano-strips embedded in glass or water are considered as optical resonators. Their scattering cross section and field enhancements in the case of...

Sřndergaard, Thomas; Bozhevolnyi, Sergey I

2007-01-01T23:59:59.000Z

476

The influence of index-depressions in core-pumped Yb-doped large pitch fibers  

Science Journals Connector (OSTI)

Rare-earth doped photonic crystal fibers rely ideally on an index matching of the doped core to the surrounding glass to work properly. Obtaining a perfect index matching is...

Jansen, Florian; Stutzki, Fabian; Otto, Hans-Jürgen; Baumgartl, Martin; Jauregui, Cesar; Limpert, Jens; Tünnermann, Andreas

2010-01-01T23:59:59.000Z

477

The Late Rev. W. V. Harcourt's Researches on Glass*  

Science Journals Connector (OSTI)

... THE subject of the preparation and optical properties of glasses of a great variety of chemical positions, formed, for nearly forty years, a ... inquiry, was published in the reports, but the results of the actual experiments on glass have never yet been published. My own connection with these experiments commenced at the ...

1871-08-31T23:59:59.000Z

478

Optical Sensor Technology Development and Deployment  

SciTech Connect (OSTI)

The objectives of this ESP (Enhanced Surveillance) project are to evaluate sensor performance for future aging studies of materials, components and weapon systems. The goal of this project is to provide analysis capability to experimentally identify and characterize the aging mechanisms and kinetics of Core Stack Assembly (CSA) materials. The work on fiber optic light sources, hermetic sealing of fiber optics, fiber optic hydrogen sensors, and detection systems will be discussed.

B. G. Parker

2005-01-24T23:59:59.000Z

479

Glass and Glass Products (2010 MECS)  

Broader source: Energy.gov [DOE]

Manufacturing Energy and Carbon Footprint for Glass Sector (NAICS 3272, 327993) Energy use data source: 2010 EIA MECS (with adjustments) Footprint Last Revised: February 2014

480

Electron-beam-induced absorption in quartz glasses  

Science Journals Connector (OSTI)

Electron-beam-induced absorption in quartz glasses of types KS-4V, KU-1, and Corning 7940 has been experimentally investigated in the 150-1000-nm region. Samples of optical materials...

Sergeev, P B; Zvorykin, V D; Sergeev, A P; Ermolenko, T A; Popov, S A; Pronina, M S; Turoverov, P K; Cheremisin, I I; Evlampiev, I K

2004-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "optical glass fibers" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


481

Glass and glass-ceramics transparent from the visible range to the mid-infrared for night vision  

Science Journals Connector (OSTI)

Many papers report studies on oxyfluorides glass-ceramics combining the optical advantage of fluoride environment for rare earth with the thermal and chemical advantages of oxide glasses [1â??7], or on oxide-based glass-ceramics exhibiting exceptional thermo-mechanical properties such as zero thermal expansion coefficient. The transparency of these glass-ceramics is limited in the infrared region up to 4 µm [8â??12]. In this paper, we report the last results on totally new infrared transmitting chalcogenide glass-ceramics which are transparent up to 11 µm for sulphur based glass or up to 16 µm for selenium based glass. By selecting appropriate glass composition in several Ge-(Sb/Ga)-(S/Se)-MX (MX: alkali halide) systems, glass-ceramics with different microcrystals volume fraction can be reproducibly obtained by controlling nucleation and crystallisation annealing time and temperatures. It has been demonstrated that crystals smaller than 200 nm induce some additional losses only in the short wavelength region. The glass ceramics keep the same transmission as the original glass from 1 µm up to 11 µm or 16 µm. Sulphur based glass-ceramics are still transparent in the second for glass and selenium based glass-ceramics keep an excellent transmission in the second and third atmospheric window. The obtained glass-ceramics exhibit much better resistance to cracks propagation than the corresponding pure glass matrix. Observations under electronic microscopy as well as X-ray diffraction have been used to determinate crystals size, density and crystalline phase. The possibility of combining the ceramisation process and the shaping by moulding has also been demonstrated.

L. Calvez; H-L. Ma; J. Lucas; X.H. Zhang

2008-01-01T23:59:59.000Z

482

Potential for energy conservation in the glass industry  

SciTech Connect (OSTI)

While the glass industry (flat glass, container glass, pressed and blown glass, and insulation fiber glass) has reduced its specific energy use (Btu/ton) by almost 30% since 1972, significant potential for further reduction still remains. State-of-the-art technologies are available which could lead to incremental improvements in glass industry energy productivity; however, these technologies must compete for capital with projects undertaken for other reasons (e.g., capacity expansion, equipment rebuild, labor cost reduction, product quality improvement, or compliance with environmental, health or safety regulations). Narrowing profit margins in the large tonnage segments of the glass industry in recent years and the fact that energy costs represent less than 25% of the value added in glass manufacture have combined to impede the widespread adoption of many state-of-the-art conservation technologies. Savings in energy costs alone have not provided the incentive to justify the capital expenditures required to realize the energy savings. Beyond implementation of state-of-the-art technologies, significant potential energy savings could accrue from advanced technologies which represent a radical departure from current glass making technology. Long-term research and development (R and D) programs, which address the technical and economic barriers associated with advanced, energy-conserving technologies, offer the opportunity to realize this energy-saving potential.

Garrett-Price, B.A.; Fassbender, A.G.; Bruno, G.A.

1986-06-01T23:59:59.000Z

483

Polyethylene fiber drawing optimization  

E-Print Network [OSTI]

Polymer fiber drawing creates fibers with enhanced thermal conductivity and strength compared to bulk polymer because drawing aligns the molecular chains. I optimize the polymer fiber drawing method in order to achieve ...

Chiloyan, Vazrik

2011-01-01T23:59:59.000Z

484

Glass Working, Use and Discard  

E-Print Network [OSTI]

Beck, Horace C. 1934 Glass before 1500 BC. Ancient Egypt7 - 21. Cooney, John 1960 Glass sculpture in ancient Egypt.Journal of Glass Studies 2, pp. 10 - 43. 1976 Glass.

Nicholson, Paul

2011-01-01T23:59:59.000Z

485

Optical high acidity sensor  

DOE Patents [OSTI]

An apparatus and method for determining acid concentrations in solutions having acid concentrations of from about 0.1 Molar to about 16 Molar is disclosed. The apparatus includes a chamber for interrogation of the sample solution, a fiber optic light source for passing light transversely through the chamber, a fiber optic collector for receiving the collimated light after transmission through the chamber, a coating of an acid resistant polymeric composition upon at least one fiber end or lens, the polymeric composition in contact with the sample solution within the chamber and having a detectable response to acid concentrations within the range of from about 0.1 Molar to about 16 Molar, a measurer for the response of the polymeric composition in contact with the sample solution, and, a comparer of the measured response to predetermined standards whereby the acid molarity of the sample solution within the chamber can be determined. Preferably, a first lens is attached to the end of the fiber optic light source, the first lens adapted to collimate light from the fiber optic light source, and a second lens is attached to the end of the fiber optic collector for focusing the collimated light after transmission through the chamber.

Jorgensen, Betty S. (Jemez Springs, NM); Nekimken, Howard L. (Los Alamos, NM); Carey, W. Patrick (Lynnwood, WA); O'Rourke, Patrick E. (Martinez, GA)

1997-01-01T23:59:59.000Z

486

Chapter 14 - Glass Recycling  

Science Journals Connector (OSTI)

Abstract Glass has established itself as an essential material in our lives. The composition of glass depends on what it is used for, but the majority of glass in circulation is of the soda-lime–silicate type. It is a material that is eminently recyclable, in the sense that it merely needs to be remelted and reformed to produce another glass article. However, glass must be color-sorted and processed to remove contaminants to ensure it is compatible with the product being manufactured. The key benefit of recycling via remelting is the reduced energy demand. However, because differences in color composition can arise between recovered glass and manufacturing output, alternative outlets are also often necessary. This chapter examines both the recycling of glass back into glass manufacture and these alternatives.

Thomas D. Dyer

2014-01-01T23:59:59.000Z

487

Kevin Glass | EMSL  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Glass kglass Primary tabs View(active tab) Track Kevin Glass Staff Member Title: Scientist Address: P.O. Box 999 K8-83 City: Richland State: WA Zip Code: 99352 Phone: (509)...

488

Synthesis and nonlinear optical properties of BaTi(BO{sub 3}){sub 2} and Ba{sub 3}Ti{sub 3}O{sub 6}(BO{sub 3}){sub 2} crystals in glasses with high TiO{sub 2} contents  

SciTech Connect (OSTI)

The ternary BaO-TiO{sub 2}-B{sub 2}O{sub 3} glasses containing a large amount of TiO{sub 2} (20-40mol%) are prepared, and their optical basicities ({lambda}), the formation, structural features and second-order optical nonlinearities of BaTi(BO{sub 3}){sub 2} and Ba{sub 3}Ti{sub 3}O{sub 6}(BO{sub 3}){sub 2} crystals are examined to develop new nonlinear optical materials. It is found that the glasses with high TiO{sub 2} contents of 30-40mol% show large optical basicities of {lambda}=0.81-0.87, suggesting the high polarizabity of TiO{sub n} polyhedra (n=4-6) in the glasses. BaTi(BO{sub 3}){sub 2} and Ba{sub 3}Ti{sub 3}O{sub 6}(BO{sub 3}){sub 2} crystals are found to be formed as main crystalline phases in the glasses. It is found that BaTi(BO{sub 3}){sub 2} crystals tend to orient at the surface of crystallized glasses. The new XRD pattern for the Ba{sub 3}Ti{sub 3}O{sub 6}(BO{sub 3}){sub 2} phase is proposed through Rietvelt analysis. The second harmonic intensities of crystallized glasses were found to be 0.8 times as large as {alpha}-quartz powders, i.e., I{sup 2{omega}}(sample)/I{sup 2{omega}}({alpha}-quartz)=0.8, for the sample with BaTi(BO{sub 3}){sub 2} crystals and to be I{sup 2{omega}}(sample)/I{sup 2{omega}}({alpha}-quartz)=68 for the sample with Ba{sub 3}Ti{sub 3}O{sub 6}(BO{sub 3}){sub 2} crystals. The Raman scattering spectra for these two crystalline phases are measured for the first time and their structural features are discussed.

Kosaka, Shinji [Department of Chemistry, Nagaoka University of Technology, 1603-1Kamitomioka-cho, Nagaoka 940-2188 (Japan); Benino, Yasuhiko [Department of Chemistry, Nagaoka University of Technology, 1603-1Kamitomioka-cho, Nagaoka 940-2188 (Japan); Fujiwara, Takumi [Department of Chemistry, Nagaoka University of Technology, 1603-1Kamitomioka-cho, Nagaoka 940-2188 (Japan); Dimitrov, Vesselin [Department of Silicate Technology, University of Chemical Technology and Metallurgy, 8 Kl, Ohridki Blvd., Sofia 1756 (Bulgaria); Komatsu, Takayuki [Department of Chemistry, Nagaoka University of Technology, 1603-1Kamitomioka-cho, Nagaoka 940-2188 (Japan)]. E-mail: komatsu@chem.nagaokaut.ac.jp

2005-06-15T23:59:59.000Z

489

Comparative study of the cutting of car interior trim panels reinforced by natural fibers  

Science Journals Connector (OSTI)

The use of natural fibers such as flax sisal or kenaf to reinforce plastic body panels for automotive applications is being introduced for car interior trim parts such as door panels hat shelves roofing etc. The benefits derived from using natural fibers instead of glass fibers are mainly ecological and economical. As a renewable product natural fibers have a greater environmental interest than oil based plastics. Natural fibers can be recycled and reused in a better way than glass fibers. On the other hand panels made of natural fibers have good mechanical properties but are lighter than glass fiber reinforced panels which means lower fuel consumption and therefore cost savings. The aim of this work is to explore the capabilities of lasers to effectively cut these new types of natural fiber reinforced panels. A comparison between the abrasive water jet cutting and the use of a CO 2 and Nd:YAG lasers is carried out. The experiments show that the laser can be used satisfactorily to cut the car interior panels reinforced by natural fibers.

J. Pou; M. Boutinguiza; F. Quintero; F. Lusquińos; R. Soto; M. Pérez-Amor

2001-01-01T23:59:59.000Z

490

DRAFT Glass.indd  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

FAST FACTS FAST FACTS Glass technology provides a versatile method for safely managing a variety of wastes SRNL has studied the behavior in glass of nearly every element in the Periodic Table Overview Converting waste materials into a stable glass form is a highly effective way of treating and disposing of many types of waste, including some hazardous and radioactive wastes. Vitrifi cation - the immobilization of a material in glass - is

491

MECS 2006- Glass  

Broader source: Energy.gov [DOE]

Manufacturing Energy and Carbon Footprint for Glass (NAICS 3272, 327993) Sector with Total Energy Input, October 2012 (MECS 2006)

492

Optical scanning apparatus  

DOE Patents [OSTI]

An optical scanner employed in a radioactive environment for reading indicia imprinted about a cylindrical surface of an article by means of an optical system including metallic reflective and mirror surfaces resistant to degradation and discoloration otherwise imparted to glass surfaces exposed to radiation is described.

Villarreal, R.A.

1985-11-06T23:59:59.000Z

493

Mixture for producing fracture-resistant, fiber-reinforced ceramic material by microwave heating  

DOE Patents [OSTI]

A fracture-resistant, fiber-reinforced ceramic substrate is produced by a method which involves preparing a ceramic precursor mixture comprising glass material, a coupling agent, and resilient fibers, and then exposing the mixture to microwave energy. The microwave field orients the fibers in the resulting ceramic material in a desired pattern wherein heat later generated in or on the substrate can be dissipated in a desired geometric pattern parallel to the fiber pattern. Additionally, the shunt capacitance of the fracture-resistant, fiber-reinforced ceramic substrate is lower which provides for a quicker transit time for electronic pulses in any conducting pathway etched into the ceramic substrate.

Meek, T.T.; Blake, R.D.

1985-04-03T23:59:59.000Z

494

Mixture for producing fracture-resistant, fiber-reinforced ceramic material by microwave heating  

DOE Patents [OSTI]

A fracture-resistant, fiber-reinforced ceramic substrate is produced by a method which involves preparing a ceramic precursor mixture comprising glass material, a coupling agent, and resilient fibers, and then exposing the mixture to microwave energy. The microwave field orients the fibers in the resulting ceramic material in a desired pattern wherein heat later generated in or on the substrate can be dissipated in a desired geometric pattern parallel to the fiber pattern. Additionally, the shunt capacitance of the fracture-resistant, fiber-reinforced ceramic substrate is lower which provides for a quicker transit time for electronic pulses in any conducting pathway etched into the ceramic substrate. 2 figs.

Meek, T.T.; Blake, R.D.

1987-09-22T23:59:59.000Z

495

Mixture for producing fracture-resistant, fiber-reinforced ceramic material by microwave heating  

DOE Patents [OSTI]

A fracture-resistant, fiber-reinforced ceramic substrate is produced by a method which involves preparing a ceramic precursor mixture comprising glass material, a coupling agent, and resilient fibers, and then exposing the mixture to microwave energy. The microwave field orients the fibers in the resulting ceramic material in a desired pattern wherein heat later generated in or on the substrate can be dissipated in a desired geometric pattern parallel to the fiber pattern. Additionally, the shunt capacitance of the fracture-resistant, fiber-reinforced ceramic substrate is lower which provides for a quicker transit time for electronic pulses in any conducting pathway etched into the ceramic substrate.

Meek, Thomas T. (Los Alamos, NM); Blake, Rodger D. (Santa Fe, NM)

1987-01-01T23:59:59.000Z

496

Complete Fiber/Copper Cable Solution for Long-Term Temperature...  

Broader source: Energy.gov (indexed) [DOE]

| US DOE Geothermal Program eere.energy.gov Talented technical team - Specialty fiber optics development, testing, and production - Downhole cable and tool development and...

497

E-Print Network 3.0 - anode-supported hollow fiber Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

16. M. Skorobogatiy, A. Dupuis, "Ferroelectric all-polymer hollow Bragg fibers for terahertz... , "New cobweb-structure hollow Bragg optical ... Source: Skorobogatiy, Maksim...

498

Second-harmonic generation in single-mode and multimode fibers  

Science Journals Connector (OSTI)

We report efficient second-harmonic generation in several commercially available telecommunication-grade single-mode and multimode optical fibers. We have investigated the effect of...

Saifi, M A; Andrejco, M J

1988-01-01T23:59:59.000Z

499

CW-Pumped Evanescent Amplification Based on Side-Polished Fiber with Heavily Er3  

E-Print Network [OSTI]

CW-Pumped Evanescent Amplification Based on Side-Polished Fiber with Heavily Er3Ăľ -Doped Glass) A novel diffractive-pumping scheme is proposed to improve the evanescent amplification using blazed fiber grating for the first time. We also investigate the cw-pumped evanescent amplification at 1.55 mm

Shy,Jow-Tsong

500

Microsoft Word - CX- Eugene Substation Fiber_130520.docx  

Broader source: Energy.gov (indexed) [DOE]

3 3 REPLY TO ATTN OF: KEC-4 SUBJECT: Environmental Clearance Memorandum Jonathan Toobian Project Manager - TPC-TPP-4 Proposed Action: Eugene Substation Fiber Interconnection Categorical Exclusion Applied (from Subpart D, 10 C.F.R. Part 1021): B 4.7 Fiber Optic Cable Location: Eugene, Lane County, Oregon Proposed by: Bonneville Power Administration (BPA) Description of the Proposed Action: BPA proposes allowing Light Speed Networks (LSN) to interconnect with its existing fiber optic network at BPA's Eugene substation in Lane County, Oregon. To interconnect to BPA's fiber network, LSN would install two new below ground fiber optic vaults within BPA's existing right-of-way. The first vault would be installed on BPA fee-owned land immediately south of the existing substation entrance, while the second vault