Sample records for fiber rock-wool fibers

  1. Fiber ReinforcedFiber Reinforced CementitiousCementitious CompositesComposites B. Mobasher

    E-Print Network [OSTI]

    Mobasher, Barzin

    prefabricated shapes panels shotcrete curtain walls Slabs on grade precast elements Composite decks Vaults Continuous and discontinuous fibers Natural, Asbestos, Wood, rock wool. Synthetic, Steel, E-glass, AR Glass of Interface Weak Zone Steel fibers, high w/c, CH formation Glass fibers strand effect, embrittlement, filling

  2. Carbon Fiber

    ScienceCinema (OSTI)

    McGetrick, Lee

    2014-07-23T23:59:59.000Z

    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.

  3. Carbon Fiber

    SciTech Connect (OSTI)

    McGetrick, Lee

    2014-04-17T23:59:59.000Z

    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.

  4. Specific Effects of Fiber Size and Fiber Swelling on Biomass...

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

    Effects of Fiber Size and Fiber Swelling on Biomass Substrate Surface Area and Enzymatic Digestibility. Specific Effects of Fiber Size and Fiber Swelling on Biomass Substrate...

  5. Polyethylene fiber drawing optimization

    E-Print Network [OSTI]

    Chiloyan, Vazrik

    2011-01-01T23:59:59.000Z

    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 ...

  6. Multimaterial acoustic fibers

    E-Print Network [OSTI]

    Chocat, Noémie

    2012-01-01T23:59:59.000Z

    The emergence of multimaterial fibers that combine a multiplicity of solid materials with disparate electrical, optical, and mechanical properties into a single fiber presents new opportunities for extending fiber applications ...

  7. Fiber Lasers

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742EnergyOnItem NotEnergy,ARMFormsGasReleaseSpeechesHall ATours, Programs and EventsFiber Lasers NIF

  8. Carbon Fiber Technology Facility

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

    The Carbon Fiber Technology Facility is relevant in proving the scale- up of low-cost carbon fiber precursor materials and advanced manufacturing technologies * Significant...

  9. Improved microstructure of cement-based composites through the addition of rock wool particles

    SciTech Connect (OSTI)

    Lin, Wei-Ting [Dept. of Civil Engineering, National Ilan University, Ilan 26047, Taiwan (China); Institute of Nuclear Energy Research, Atomic Energy Council, Taoyuan 32546, Taiwan (China); Cheng, An, E-mail: ancheng@niu.edu.tw [Dept. of Civil Engineering, National Ilan University, Ilan 26047, Taiwan (China); Huang, Ran; Zou, Si-Yu [Dept. of Harbor and River Engineering, National Taiwan Ocean University, Keelung 20224, Taiwan (China)

    2013-10-15T23:59:59.000Z

    Rock wool is an inorganic fibrous substance produced by steam blasting and cooling molten glass. As with other industrial by-products, rock wool particles can be used as cementitious materials or ultra fine fillers in cement-based composites. This study investigated the microstructure of mortar specimens produced with cement-based composites that include various forms of rock wool particles. It conducted compressive strength testing, rapid chloride penetration tests, X-ray diffraction analysis, thermo-gravimetric analysis, and scanning electronic microscopy to evaluate the macro- and micro-properties of the cement-based composites. Test results indicate that inclusion of rock wool particles in composites improved compressive strength and reduced chloride ion penetration at the age of 91 days due to the reduction of calcium hydroxide content. Microscopic analysis confirms that the use of rock wool particles contributed to the formation of a denser, more compact microstructure within the hardened paste. In addition, X-ray diffraction analysis shows few changes in formation of pozzolanic reaction products and no new hydrations are formed with incorporating rock wool particles. - Highlights: • We report the microstructural characterization of cement-based composites. • Different mixes produced with various rock wool particles have been tested. • The influence of different mixes on macro and micro properties has been discussed. • The macro properties are included compressive strength and permeability. • XRD and SEM observations confirm the pozzolanic reaction in the resulting pastes.

  10. Omnidirectional fiber optic tiltmeter

    DOE Patents [OSTI]

    Benjamin, B.C.; Miller, H.M.

    1983-06-30T23:59:59.000Z

    A tiltmeter is provided which is useful in detecting very small movements such as earth tides. The device comprises a single optical fiber, and an associated weight affixed thereto, suspended from a support to form a pendulum. A light source, e.g., a light emitting diode, mounted on the support transmits light through the optical fiber to a group of further optical fibers located adjacent to but spaced from the free end of the single optical fiber so that displacement of the single optical fiber with respect to the group will result in a change in the amount of light received by the individual optical fibers of the group. Photodetectors individually connectd to the fibers produce corresponding electrical outputs which are differentially compared and processed to produce a resultant continuous analog output representative of the amount and direction of displacement of the single optical fiber.

  11. Multimaterial fiber electronics

    E-Print Network [OSTI]

    Lestoquoy, Guillaume

    2014-01-01T23:59:59.000Z

    As the number of materials that are thermally-drawable into fibers is rapidly expending, numerous new multimaterial fiber architectures can be envisioned and fabricated. High-melting temperature metals, compound materials, ...

  12. Fiber optic coupled optical sensor

    DOE Patents [OSTI]

    Fleming, Kevin J. (Albuquerque, NM)

    2001-01-01T23:59:59.000Z

    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.

  13. Helical Fiber Amplifier

    DOE Patents [OSTI]

    Koplow, Jeffrey P. (Washington, DC); Kliner, Dahy (San Ramon, CA); Goldberg, Lew (Fairfax, VA)

    2002-12-17T23:59:59.000Z

    A multi-mode gain fiber is provided which affords substantial improvements in the maximum pulse energy, peak power handling capabilities, average output power, and/or pumping efficiency of fiber amplifier and laser sources while maintaining good beam quality (comparable to that of a conventional single-mode fiber source). These benefits are realized by coiling the multimode gain fiber to induce significant bend loss for all but the lowest-order mode(s).

  14. Quantitive DNA Fiber Mapping

    E-Print Network [OSTI]

    Lu, Chun-Mei

    2009-01-01T23:59:59.000Z

    of California. Lu et al. : DNA Fiber Mapping page - 35 Lu etal. : DNA Fiber Mapping page - 36 a b c d e f g OV P1 cloneSp6 end T7 end Lu et al. : DNA Fiber Mapping page - 37 a b c

  15. Hybrid matrix fiber composites

    DOE Patents [OSTI]

    Deteresa, Steven J.; Lyon, Richard E.; Groves, Scott E.

    2003-07-15T23:59:59.000Z

    Hybrid matrix fiber composites having enhanced compressive performance as well as enhanced stiffness, toughness and durability suitable for compression-critical applications. The methods for producing the fiber composites using matrix hybridization. The hybrid matrix fiber composites include two chemically or physically bonded matrix materials, whereas the first matrix materials are used to impregnate multi-filament fibers formed into ribbons and the second matrix material is placed around and between the fiber ribbons that are impregnated with the first matrix material and both matrix materials are cured and solidified.

  16. Fiber optic laser rod

    DOE Patents [OSTI]

    Erickson, G.F.

    1988-04-13T23:59:59.000Z

    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.

  17. Fiber coating method

    DOE Patents [OSTI]

    Corman, Gregory Scot (Ballston Lake, NY)

    2001-01-01T23:59:59.000Z

    A coating is applied to reinforcing fibers arranged into a tow by coaxially aligning the tow with an adjacent separation layer and winding or wrapping the tow and separation layer onto a support structure in an interleaved manner so that the separation layer separates a wrap of the tow from an adjacent wrap of the tow. A coating can then be uniformly applied to the reinforcing fibers without defects caused by fiber tow to fiber tow contact. The separation layer can be a carbon fiber veil.

  18. Fiber optic moisture sensor

    DOE Patents [OSTI]

    Kirkham, R.R.

    1984-08-03T23:59:59.000Z

    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.

  19. Fiber optic vibration sensor

    DOE Patents [OSTI]

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

    1995-01-01T23:59:59.000Z

    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.

  20. Fiber optic vibration sensor

    DOE Patents [OSTI]

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

    1995-01-10T23:59:59.000Z

    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.

  1. Optical Fibers Optics and Photonics

    E-Print Network [OSTI]

    Palffy-Muhoray, Peter

    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

  2. Fiber composite flywheel rim

    DOE Patents [OSTI]

    Davis, D.E.; Ingham, K.T.

    1987-04-28T23:59:59.000Z

    A flywheel comprising a hub having at least one radially projecting disc, an annular rim secured to said disc and providing a surface circumferential to said hub, a first plurality of resin-impregnated fibers wound about said rim congruent to said surface, and a shell enclosing said first plurality of fibers and formed by a second plurality of resin-impregnated fibers wound about said rim tangentially to said surface. 2 figs.

  3. Fiber optic micro accelerometer

    DOE Patents [OSTI]

    Swierkowski, Steve P.

    2005-07-26T23:59:59.000Z

    An accelerometer includes a wafer, a proof mass integrated into the wafer, at least one spring member connected to the proof mass, and an optical fiber. A Fabry-Perot cavity is formed by a partially reflective surface on the proof mass and a partially reflective surface on the end of the optical fiber. The two partially reflective surfaces are used to detect movement of the proof mass through the optical fiber, using an optical detection system.

  4. Continuous Fiber Ceramic Composites

    SciTech Connect (OSTI)

    None

    2002-09-01T23:59:59.000Z

    Fiber-reinforced ceramic composites demonstrate the high-temperature stability of ceramics--with an increased fracture toughness resulting from the fiber reinforcement of the composite. The material optimization performed under the continuous fiber ceramic composites (CFCC) included a series of systematic optimizations. The overall goals were to define the processing window, to increase the robustinous of the process, to increase process yield while reducing costs, and to define the complexity of parts that could be fabricated.

  5. Fiber composite flywheel rim

    DOE Patents [OSTI]

    Davis, Donald E. (Thousand Oaks, CA); Ingham, Kenneth T. (Woodland Hills, CA)

    1987-01-01T23:59:59.000Z

    A flywheel 2 comprising a hub 4 having at least one radially projecting disc 6, an annular rim 14 secured to said disc and providing a surface circumferential to said hub, a first plurality of resin-impregnated fibers 22 wound about said rim congruent to said surface, and a shell 26 enclosing said first plurality of fibers and formed by a second plurality of resin-impregnated fibers wound about said rim tangentially to said surface.

  6. Carbon Fiber SMC

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

    confidential, or otherwise restricted information. ACC932 Materials and Processes Technology Development Carbon Fiber SMC 5-20-09 Charles Knakal USCAR C. S. Wang General Motors...

  7. Fiber Mesh Diagnostic

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

    Fiber Mesh Diagnostic for Transverse Profile Measurements RadiaBeam Technologies October 2010 ATF User's Meeting R. Agustsson (PI), G. Andonian, A. Murokh, R. Tikhoplav Funded by...

  8. Carbon Fiber Technology Facility

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

    conventional and alternative precursors to carbon fiber Advance high-volume composite design and manufacturing capabilities Transition technology to industry partners...

  9. Multimode optical fiber

    DOE Patents [OSTI]

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

    2014-11-04T23:59:59.000Z

    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).

  10. Fiber optic hydrophone

    DOE Patents [OSTI]

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

    1994-05-10T23:59:59.000Z

    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.

  11. Fiber optic hydrogen sensor

    DOE Patents [OSTI]

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

    1991-01-01T23:59:59.000Z

    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.

  12. Fiber optic compass development

    E-Print Network [OSTI]

    Park, Kyongtae

    2005-11-01T23:59:59.000Z

    is illustrated schematically in Fig. 3-1. The light source is an erbium doped fiber (EDF) laser in the ring configuration [11-12]. Total amplified spontaneous emission (ASE) power is 7 mW at 45 mW pump power. The laser is spectrally scanned in the 1525 ~ 1565... optic modulator and amplified by a commercial erbium- doped fiber amplifier (EDFA). The spectrum of the laser after amplification at 6 different wavelengths is shown in Fig. 3-3. After amplification, the light passes through a fiber coupler...

  13. Fiber bundle phase conjugate mirror

    DOE Patents [OSTI]

    Ward, Benjamin G.

    2012-05-01T23:59:59.000Z

    An improved method and apparatus for passively conjugating the phases of a distorted wavefronts resulting from optical phase mismatch between elements of a fiber laser array are disclosed. A method for passively conjugating a distorted wavefront comprises the steps of: multiplexing a plurality of probe fibers and a bundle pump fiber in a fiber bundle array; passing the multiplexed output from the fiber bundle array through a collimating lens and into one portion of a non-linear medium; passing the output from a pump collection fiber through a focusing lens and into another portion of the non-linear medium so that the output from the pump collection fiber mixes with the multiplexed output from the fiber bundle; adjusting one or more degrees of freedom of one or more of the fiber bundle array, the collimating lens, the focusing lens, the non-linear medium, or the pump collection fiber to produce a standing wave in the non-linear medium.

  14. Fiber alignment apparatus and method

    DOE Patents [OSTI]

    Kravitz, Stanley H. (Placitas, NM); Warren, Mial Evans (Albuquerque, NM); Snipes, Jr., Morris Burton (Albuquerque, NM); Armendariz, Marcelino Guadalupe (Albuquerque, NM); Word, V., James Cole (Albuqueruqe, NM)

    1997-01-01T23:59:59.000Z

    A fiber alignment apparatus includes a micro-machined nickel spring that captures and locks arrays of single mode fibers into position. The design consists of a movable nickel leaf shaped spring and a fixed pocket where fibers are held. The fiber is slid between the spring and a fixed block, which tensions the spring. When the fiber reaches the pocket, it automatically falls into the pocket and is held by the pressure of the leaf spring.

  15. Introgression & mapping Fiber cell

    E-Print Network [OSTI]

    Germplasm Introgression Genomics & mapping Fiber cell initiation Radiation hybrid (RH) mapping and breeding. Research activities commonly include plant breeding, genetics, genomics, cytogenetics, molecular methods. (C, S) · Contribute uniquely to genomics and its relevance to genetic improvement (C,S) · Harness

  16. Optoelectronic fiber interface design

    E-Print Network [OSTI]

    Spencer, Matthew Edmund

    2008-01-01T23:59:59.000Z

    Recent developments in materials science have led to the development of an exciting, new class of fibers which integrate metals, semiconductors and insulators in the same codrawing process. Various electrical devices have ...

  17. Multimaterial rectifying device fibers

    E-Print Network [OSTI]

    Orf, Nicholas D

    2009-01-01T23:59:59.000Z

    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 ...

  18. Dark Soliton Fiber Laser

    E-Print Network [OSTI]

    H. Zhang; D. Y. Tang; L. M. Zhao; X. Wu; Q. L. Bao; K. P. Loh

    2009-05-08T23:59:59.000Z

    We report on the experimental observation of stable dark solitons in an all normal dispersion fiber laser. We found experimentally that dark soliton formation is a generic feature of the fiber laser under strong continuous wave (CW) emission. However, only under appropriate pump strength and negative cavity feedback, stable single or multiple dark soliton could be achieved. Furthermore, we show that the features of the observed dark solitons could be well understood based on the nonlinear Schrodinger equation (NLSE).

  19. Carbon Fiber Pilot Plant and Research Facilities

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

    for the U.S. Department of Energy Presentationname Carbon Fiber Facilities Materials Carbon Fiber Research Facility Type Production Fiber Types Tow Size Tensioning Line...

  20. Enhanced radiation resistant fiber optics

    DOE Patents [OSTI]

    Lyons, P.B.; Looney, L.D.

    1993-11-30T23:59:59.000Z

    A process for producing an optical fiber having enhanced radiation resistance is provided, the process including maintaining an optical fiber within a hydrogen-containing atmosphere for sufficient time to yield a hydrogen-permeated optical fiber having an elevated internal hydrogen concentration, and irradiating the hydrogen-permeated optical fiber at a time while the optical fiber has an elevated internal hydrogen concentration with a source of ionizing radiation. The radiation source is typically a cobalt-60 source and the fiber is pre-irradiated with a dose level up to about 1000 kilorads of radiation. 4 figures.

  1. Enhanced radiation resistant fiber optics

    DOE Patents [OSTI]

    Lyons, Peter B. (Los Alamos, NM); Looney, Larry D. (Los Alamos, NM)

    1993-01-01T23:59:59.000Z

    A process for producing an optical fiber having enhanced radiation resitance is provided, the process including maintaining an optical fiber within a hydrogen-containing atmosphere for sufficient time to yield a hydrogen-permeated optical fiber having an elevated internal hydrogen concentration, and irradiating the hydrogen-permeated optical fiber at a time while the optical fiber has an elevated internal hydrogen concentration with a source of ionizing radiation. The radiation source is typically a cobalt-60 source and the fiber is pre-irradiated with a dose level up to about 1000 kilorads of radiation.

  2. Low Cost Carbon Fiber Production Carbon Fiber Manufacturing Cost Modeling

    E-Print Network [OSTI]

    to bond with composite matrix material. It is important that a carbon fiber manufacturing cost model manufactured with carbon fiber as opposed to traditional materials such as steel, automotive parts are able associated with both the manufacture of carbon fibers themselves as well as their composites. Traditional

  3. Optical and optoelectronic fiber devices

    E-Print Network [OSTI]

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

    2007-01-01T23:59:59.000Z

    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, ...

  4. Distributed optical fiber vibration sensing 

    E-Print Network [OSTI]

    Yu, Hui

    2001-01-01T23:59:59.000Z

    This thesis presents a distributed optical fiber vibration sensor. The purpose of this sensing system is to monitor, in real time, the status of railcars by burying an optical fiber underground beside the rails. Using a coherent homodyne technique...

  5. Fiber Supply Associate Company Overview

    E-Print Network [OSTI]

    Mazzotti, Frank

    materials acquisition, harvesting, logistics coordination, contract negotiations, and inventory management, Purchasing, Industrial Engineering, Operations management, Materials Management, Supply Chain) Authorized leadership roles such as Fiber Specialist, Fiber Supply Manager, Region Manager, Director, General Manager

  6. Automated fiber pigtailing machine

    DOE Patents [OSTI]

    Strand, O.T.; Lowry, M.E.

    1999-01-05T23:59:59.000Z

    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.

  7. Automated fiber pigtailing machine

    DOE Patents [OSTI]

    Strand, Oliver T. (Castro Valley, CA); Lowry, Mark E. (Castro Valley, CA)

    1999-01-01T23:59:59.000Z

    The Automated Fiber Pigtailing Machine (AFPM) aligns and attaches optical fibers to optoelectonic (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.

  8. Silicon fiber optic sensors

    DOE Patents [OSTI]

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

    2007-10-02T23:59:59.000Z

    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%.

  9. Genetics of Cotton Fiber Elongation

    E-Print Network [OSTI]

    Ng, Eng Hwa

    2013-05-29T23:59:59.000Z

    ability GxE Genotype by environment interaction HVI High volume instrument Mic Micronaire (HVI) SCA Specific combining ability Str-H Fiber strength (HVI) Str-S Fiber strength (Stelometer) UHML Upper-half mean length (HVI) UI Uniformity index... Station, TX .................................................................................... 38 5 Mean squares of GCA and SCA for HVI fiber properties in 2010 and 2011 in College Station, TX...

  10. Aerogel-clad optical fiber

    DOE Patents [OSTI]

    Sprehn, G.A.; Hrubesh, L.W.; Poco, J.F.; Sandler, P.H.

    1997-11-04T23:59:59.000Z

    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. 4 figs.

  11. Large core fiber optic cleaver

    DOE Patents [OSTI]

    Halpin, J.M.

    1996-03-26T23:59:59.000Z

    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.

  12. Large core fiber optic cleaver

    DOE Patents [OSTI]

    Halpin, John M. (Livermore, CA)

    1996-01-01T23:59:59.000Z

    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 .mu.m.

  13. Drying of fiber webs

    DOE Patents [OSTI]

    Warren, David W. (9253 Glenoaks Blvd., Sun Valley, CA 91352)

    1997-01-01T23:59:59.000Z

    A process and an apparatus for high-intensity drying of fiber webs or sheets, such as newsprint, printing and writing papers, packaging paper, and paperboard or linerboard, as they are formed on a paper machine. The invention uses direct contact between the wet fiber web or sheet and various molten heat transfer fluids, such as liquified eutectic metal alloys, to impart heat at high rates over prolonged durations, in order to achieve ambient boiling of moisture contained within the web. The molten fluid contact process causes steam vapor to emanate from the web surface, without dilution by ambient air; and it is differentiated from the evaporative drying techniques of the prior industrial art, which depend on the uses of steam-heated cylinders to supply heat to the paper web surface, and ambient air to carry away moisture, which is evaporated from the web surface. Contact between the wet fiber web and the molten fluid can be accomplished either by submersing the web within a molten bath or by coating the surface of the web with the molten media. Because of the high interfacial surface tension between the molten media and the cellulose fiber comprising the paper web, the molten media does not appreciately stick to the paper after it is dried. Steam generated from the paper web is collected and condensed without dilution by ambient air to allow heat recovery at significantly higher temperature levels than attainable in evaporative dryers.

  14. Drying of fiber webs

    DOE Patents [OSTI]

    Warren, D.W.

    1997-04-15T23:59:59.000Z

    A process and an apparatus are disclosed for high-intensity drying of fiber webs or sheets, such as newsprint, printing and writing papers, packaging paper, and paperboard or linerboard, as they are formed on a paper machine. The invention uses direct contact between the wet fiber web or sheet and various molten heat transfer fluids, such as liquefied eutectic metal alloys, to impart heat at high rates over prolonged durations, in order to achieve ambient boiling of moisture contained within the web. The molten fluid contact process causes steam vapor to emanate from the web surface, without dilution by ambient air; and it is differentiated from the evaporative drying techniques of the prior industrial art, which depend on the uses of steam-heated cylinders to supply heat to the paper web surface, and ambient air to carry away moisture, which is evaporated from the web surface. Contact between the wet fiber web and the molten fluid can be accomplished either by submersing the web within a molten bath or by coating the surface of the web with the molten media. Because of the high interfacial surface tension between the molten media and the cellulose fiber comprising the paper web, the molten media does not appreciatively stick to the paper after it is dried. Steam generated from the paper web is collected and condensed without dilution by ambient air to allow heat recovery at significantly higher temperature levels than attainable in evaporative dryers. 6 figs.

  15. Optical and mechanical behavior of the optical fiber infrasound sensor

    E-Print Network [OSTI]

    DeWolf, Scott

    2009-01-01T23:59:59.000Z

    1.2 The Optical Fiber Infrasound Sensor . . . . . . .Fiber Infrasound Sensor Optical fibers are well known forSchnidrig. An optical fiber infrasound sensor: A new lower

  16. Fiber optic fluid detector

    DOE Patents [OSTI]

    Angel, S.M.

    1987-02-27T23:59:59.000Z

    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.

  17. Buried fiber optic sensor

    E-Print Network [OSTI]

    Park, Jaehee

    1992-01-01T23:59:59.000Z

    , and TMom modes. Otherwise vm gives the HEv hm and EHv-hm modest20] 18 Table I. Parameters of the laser source and the fused silica fiber which are used in this experiment. n=n1=1. 4527 n2= 1. 4483 D (core diameter )= 8 um Cladding Diameter = 125 um... Interferometer . B. Frequency Chirping of Laser Diode C. Pressure Sensitivity to Uniform Pressure . . . . . . . . . . D. Pressure Sensitivity to Transverse Pressure . . . . E. Pressure Sensitivity to Longitudinal Pressure . . . . . . . . . . I 3 . . . . 20...

  18. Fiber optic sensor and method for making

    DOE Patents [OSTI]

    Vartuli, James Scott; Bousman, Kenneth Sherwood; Deng, Kung-Li; McEvoy, Kevin Paul; Xia, Hua

    2010-05-18T23:59:59.000Z

    A fiber optic sensor including a fiber having a modified surface integral with the fiber wherein the modified surface includes an open pore network with optical agents dispersed within the open pores of the open pore network. Methods for preparing the fiber optic sensor are also provided. The fiber optic sensors can withstand high temperatures and harsh environments.

  19. Fiber laser development for LISA

    E-Print Network [OSTI]

    Kenji Numata; Jeffrey R. Chen; Jordan Camp

    2010-03-18T23:59:59.000Z

    We have developed a linearly-polarized Ytterbium-doped fiber ring laser with single longitudinal-mode output at 1064nm for LISA and other space applications. Single longitudinal-mode selection was achieved by using a fiber Bragg grating (FBG) and a fiber Fabry-Perot (FFP). The FFP also serves as a frequency-reference within our ring laser. Our laser exhibits comparable low frequency and intensity noise to Non-Planar Ring Oscillator (NPRO). By using a fiber-coupled phase modulator as a frequency actuator, the laser frequency can be electro-optically tuned at a rate of 100kHz. It appears that our fiber ring laser is promising for space applications where robustness of fiber optics is desirable.

  20. System for testing optical fibers

    DOE Patents [OSTI]

    Golob, John E. [Olathe, KS; Looney, Larry D. [Los Alamos, NM; Lyons, Peter B. [Los Alamos, NM; Nelson, Melvin A. [Santa Barbara, CA; Davies, Terence J. [Santa Barbara, CA

    1980-07-15T23:59:59.000Z

    A system for measuring a combination of optical transmission properties of fiber optic waveguides. A polarized light pulse probe is injected into one end of the optical fiber. Reflections from discontinuities within the fiber are unpolarized whereas reflections of the probe pulse incident to its injection remain polarized. The polarized reflections are prevented from reaching a light detector whereas reflections from the discontinuities reaches the detector.

  1. Low Cost Carbon Fiber Overview

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

    and Processing (IT) Lignin-Based Low-Cost Carbon Fiber Precursors * Structural Materials for Vehicles (VT) * Graphite Electrodes for Arc Furnaces (IT) * Nanoporous CF for...

  2. Lower Cost Carbon Fiber Precursors

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

    production and conversion parameters must be optimized. Lower cost fiber enable CF composite applications. Approach: 1. Complete previous effort by scaling to the CF production...

  3. Carbon Fiber Consortium | Partnerships | ORNL

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

    in 2011 to accelerate the development and deployment of new, lower cost carbon fiber composite materials. The Consortium draws on the broad experience that the Oak Ridge National...

  4. Carbon Fiber Cluster Strategy | ornl.gov

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

    Carbon Fiber Cluster Strategy ORNL has a 40-year history in R&D on fiber-reinforced composite materials, and has been leading DOE's low-cost carbon fiber initiative for more than...

  5. Carbon Fiber Composite Cellular A Dissertation

    E-Print Network [OSTI]

    Wadley, Haydn

    Carbon Fiber Composite Cellular Structures ____________________________________ A Dissertation and honeycombs. However, for weight sensitive, ambient temperature applications, carbon fiber composites have emerged as a promising material due to its high specific strength and low density. Carbon fiber reinforced

  6. Fiber optic geophysical sensors

    DOE Patents [OSTI]

    Homuth, E.F.

    1991-03-19T23:59:59.000Z

    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.

  7. Dark Fiber Testbed

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625govInstrumentstdmadapInactiveVisitingContract Management Fermi SitePARTOfficeOctoberDaniel Wood Dark Fiber Testbed

  8. CFTF | Carbon Fiber Technology Facility | ORNL

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

    BTRIC CNMS CSMB CFTF Working with CFTF HFIR MDF NTRC OLCF SNS Carbon Fiber Technology Facility Home | User Facilities | CFTF CFTF | Carbon Fiber Technology Facility SHARE Oak...

  9. Fiber Laser Based Nonlinear Spectroscopy

    E-Print Network [OSTI]

    Adany, Peter

    2012-08-31T23:59:59.000Z

    Figure 31. Varied output spectrum of NL-PM-750 (spectrograms) .................................72 Figure 32. Comparison of four dispersion profiles. ..........................................................75 Figure 33. Simulations of four dispersion... characteristics of three photonic crystal fibers. 82 Figure 39. Simulation of NL-PM-750............................................................................... 83 Figure 40. Varying the input wavelength in NL-PM-750 fiber...

  10. Buried fiber optic intrusion sensor

    E-Print Network [OSTI]

    Maier, Eric William

    2004-09-30T23:59:59.000Z

    to the buried sensor induces a phase shift in light propagating along the fiber which allows for the detection and localization of intrusions. Through the use of an ultra-stable erbium-doped fiber laser and phase sensitive optical time domain reflectometry...

  11. Fiber Grating Environmental Sensing System

    DOE Patents [OSTI]

    Schulz, Whitten L. (Fairview, OR); Udd, Eric (Fairview, OR)

    2003-07-29T23:59:59.000Z

    Fiber grating environmental measurement systems are comprised of sensors that are configured to respond to changes in moisture or chemical content of the surrounding medium through the action of coatings and plates inducing strain that is measured. These sensors can also be used to monitor the interior of bonds for degradation due to aging, cracking, or chemical attack. Means to multiplex these sensors at high speed and with high sensitivity can be accomplished by using spectral filters placed to correspond to each fiber grating environmental sensor. By forming networks of spectral elements and using wavelength division multiplexing arrays of fiber grating sensors may be processed in a single fiber line allowing distributed high sensitivity, high bandwidth fiber optic grating environmental sensor systems to be realized.

  12. Apparatus and method for combining light from two or more fibers into a single fiber

    DOE Patents [OSTI]

    Klingsporn, Paul Edward

    2007-02-20T23:59:59.000Z

    An apparatus and method for combining light signals carried on a plurality of input fibers onto a single receiving fiber with a high degree of efficiency. The apparatus broadly comprises the receiving fiber and a plurality of input fiber-lens assemblies, with each fiber lens assembly including an input fiber; a collimating lens interposed between the input fiber and the receiving fiber and adapted to collimate the light signal; and a focusing lens interposed between the collimating lens and the receiving fiber and adapted to focus the collimated light signal onto the face of the receiving fiber. The components of each fiber-lens assembly are oriented along an optic axis that is inclined relative to the receiving fiber, with the inclination angle depending at least in part on the input fiber's numerical aperture and the focal lengths and diameters of the collimating and focusing lenses.

  13. Apparatus and method for combining light from two or more fibers into a single fiber

    SciTech Connect (OSTI)

    Klingsporn, Paul Edward

    2006-03-14T23:59:59.000Z

    An apparatus and method for combining light signals carried on a plurality of input fibers onto a single receiving fiber with a high degree of efficiency. The apparatus broadly comprises the receiving fiber and a plurality of input fiber-lens assemblies, with each fiber lens assembly including an input fiber; a collimating lens interposed between the input fiber and the receiving fiber and adapted to collimate the light signal; and a focusing lens interposed between the collimating lens and the receiving fiber and adapted to focus the collimated light signal onto the face of the receiving fiber. The components of each fiber-lens assembly are oriented along an optic axis that is inclined relative to the receiving fiber, with the inclination angle depending at least in part on the input fiber's numerical aperture and the focal lengths and diameters of the collimating and focusing lenses.

  14. High performance fibers. Final report

    SciTech Connect (OSTI)

    Economy, J.

    1994-01-01T23:59:59.000Z

    A two and a half year ONR/ARPA funded program to develop a low cost process for manufacture of a high strength/high modulus sigma/E boron nitride (BN) fiber was initiated on 7/1/90 and ended on 12/31/92. The preparation of high sigma/E BN fibers had been demonstrated in the late 1960's by the PI using a batch nitriding of B2O3 fiber with NH3 followed by stress graphitization at approx. 2000 deg C. Such fibers displayed values comparable to PAN based carbon fibers but the mechanicals were variable most likely because of redeposition of volatiles at 2000 deg C. In addition, the cost of the fibers was very high due to the need for many hours of nitriding necessary to convert the B2O3 fibers. The use of batch nitriding negated two possible cost advantages of this concept, namely, the ease of drawing very fine, multi-filament yarn of B2O3 and more importantly the very low cost of the starting materials.

  15. Infrared Fiber Optics James A. Harrington

    E-Print Network [OSTI]

    1 Infrared Fiber Optics James A. Harrington Ceramic & Materials Engineering Rutgers University Piscataway, NJ 08854-8065 1. Introduction Infrared (IR) optical fibers may be defined as fiber optics IR fiber optics may logically be divided into three broad categories: glass, crystalline, and hollow

  16. Optical fiber reliability models M. John Matthewson

    E-Print Network [OSTI]

    Matthewson, M. John

    3 Optical fiber reliability models M. John Matthewson Fiber Optic Materials Research Program Systems containing optical fiber have design lives on the order of decades so that models for assessing and promising areas for future work are proposed. 1. INTRODUCTION Mechanical failure of optical fiber must

  17. Ethanol extraction of phytosterols from corn fiber

    DOE Patents [OSTI]

    Abbas, Charles (Champaign, IL); Beery, Kyle E. (Decatur, IL); Binder, Thomas P. (Decatur, IL); Rammelsberg, Anne M. (Decatur, IL)

    2010-11-16T23:59:59.000Z

    The present invention provides a process for extracting sterols from a high solids, thermochemically hydrolyzed corn fiber using ethanol as the extractant. The process includes obtaining a corn fiber slurry having a moisture content from about 20 weight percent to about 50 weight percent solids (high solids content), thermochemically processing the corn fiber slurry having high solids content of 20 to 50% to produce a hydrolyzed corn fiber slurry, dewatering the hydrolyzed corn fiber slurry to achieve a residual corn fiber having a moisture content from about 30 to 80 weight percent solids, washing the residual corn fiber, dewatering the washed, hydrolyzed corn fiber slurry to achieve a residual corn fiber having a moisture content from about 30 to 80 weight percent solids, and extracting the residual corn fiber with ethanol and separating at least one sterol.

  18. Fiber felts as low density structural materials

    SciTech Connect (OSTI)

    Milewski, J.V.; Newfield, S.E.

    1981-01-01T23:59:59.000Z

    Short fiber felts structures can be made which provide improvements in properties over foams. In applications where resistance to compression set or stress relaxation are important, bonded fiber felts excel due to the flexing of individual fibers within their elastic limit. Felts of stainless steel and polyester fibers were prepared by deposition from liquid slurries. Compressive properties were determined as a function of felt parent material, extent of bonding, felt density, and length-to-diameter (L/D) ratio of starting fibers.

  19. Scintillator fiber optic long counter

    DOE Patents [OSTI]

    McCollum, T.; Spector, G.B.

    1994-03-29T23:59:59.000Z

    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 is described. 11 figures.

  20. Mobile fiber optic emission spectrograph

    SciTech Connect (OSTI)

    Spencer, W.A.; Coleman, C.J.; McCarty, J.E.; Beck, R.S.

    1997-05-01T23:59:59.000Z

    Technical Assistance Request HLW/DWPF-TAR-970064 asked SRTC to evaluate the use of a fiber optic coupled emission spectrometer. The spectrometer would provide additional ICP analyses in the DWPF laboratory.

  1. Low Cost Carbon Fiber Overview

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

    UT-Battelle for the U.S. Department of Energy Presentationname CARBON FIBER OVERVIEW Materials LM002 Task FY 2010 Budget Industry Cost Share FY 2011 Budget Industry Cost Share...

  2. LongviewCowlitzFiberCX

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

    new ground disturbance. To accommodate the additional weight of the fiber cable on the transmission line, BPA would need to rebuild eight towers to a higher pole class: 110, 2...

  3. Buried fiber optic intrusion sensor 

    E-Print Network [OSTI]

    Maier, Eric William

    2004-09-30T23:59:59.000Z

    A distributed fiber optic intrusion sensor capable of detecting intruders from the pressure of their weight on the earth's surface was investigated in the laboratory and in field tests. The presence of an intruder above or in proximity...

  4. High repetition rate fiber lasers

    E-Print Network [OSTI]

    Chen, Jian, Ph. D. Massachusetts Institute of Technology

    2009-01-01T23:59:59.000Z

    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 ...

  5. Lower Cost Carbon Fiber Precursors

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

    1 Lower Cost Carbon Fiber Precursors P.I. Name: Dave Warren Presenter: Dr. Amit K. Naskar Oak Ridge National Laboratory 05162012 Project ID LM004 This presentation does not...

  6. Optical fiber sensor having a sol-gel fiber core and a method of making

    DOE Patents [OSTI]

    Tao, Shiquan; Jindal, Rajeev; Winstead, Christopher; Singh, Jagdish P.

    2006-06-06T23:59:59.000Z

    A simple, economic wet chemical procedure is described for making sol-gel fibers. The sol-gel fibers made from this process are transparent to ultraviolet, visible and near infrared light. Light can be guided in these fibers by using an organic polymer as a fiber cladding. Alternatively, air can be used as a low refractive index medium. The sol-gel fibers have a micro pore structure which allows molecules to diffuse into the fiber core from the surrounding environment. Chemical and biochemical reagents can be doped into the fiber core. The sol-gel fiber can be used as a transducer for constructing an optical fiber sensor. The optical fiber sensor having an active sol-gel fiber core is more sensitive than conventional evanescent wave absorption based optical fiber sensors.

  7. anchored carbon fiber: Topics by E-print Network

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

    material. It is important that a carbon fiber manufacturing cost model 4 Carbon Fiber Composite Cellular A Dissertation Materials Science Websites Summary: Carbon Fiber Composite...

  8. Optical fiber inspection system

    DOE Patents [OSTI]

    Moore, F.W.

    1985-04-05T23:59:59.000Z

    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.

  9. Ceramic composites: Roles of fiber and interface

    SciTech Connect (OSTI)

    Singh, J.P.; Singh, D. [Argonne National Lab., IL (United States). Energy Technology Div.

    1997-09-01T23:59:59.000Z

    Results are presented that elucidate (a) the effects of fiber coating on retained fiber strength and mechanical properties of Nicalon-fiber-reinforced SiC matrix composites, and (b) the role of residual stresses in the interfacial bond strength of SiC-fiber-reinforced reaction-bonded Si{sub 3}N{sub 4} matrix composites. For Nicalon-fiber-reinforced SiC matrix composites that were fractured in a flexural mode, retained in-situ fiber strength, ultimate strength, and work-of-fracture (WOF) of the composites increased with increasing thickness of the fiber coating and reached maximum values at a coating thickness of {approx} 0.3 {micro}m. A direct correlation between the variation of in-situ fiber strength and the variation of ultimate strength and WOF of the composites clearly indicates the critical role of the retained in-situ strength of reinforcing fibers in composites. Fiber pushout tests performed on SiC-fiber-reinforced reaction-bonded Si{sub 3}N{sub 4} matrix composites indicate that both debonding and frictional shear stresses decreased with increasing fiber content. These variations are consistent with the variation of residual radial stress on fibers, as measured by neutron diffraction, i.e., residual stresses decreased with increasing fiber content. Because fracture behavior is strongly controlled by interfacial bond strength, which is proportional to the residual radial stress, appropriate control of residual stress is critical in the design of composites with desired fracture properties.

  10. Carbon nanotube fiber spun from wetted ribbon

    DOE Patents [OSTI]

    Zhu, Yuntian T; Arendt, Paul; Zhang, Xiefei; Li, Qingwen; Fu, Lei; Zheng, Lianxi

    2014-04-29T23:59:59.000Z

    A fiber of carbon nanotubes was prepared by a wet-spinning method involving drawing carbon nanotubes away from a substantially aligned, supported array of carbon nanotubes to form a ribbon, wetting the ribbon with a liquid, and spinning a fiber from the wetted ribbon. The liquid can be a polymer solution and after forming the fiber, the polymer can be cured. The resulting fiber has a higher tensile strength and higher conductivity compared to dry-spun fibers and to wet-spun fibers prepared by other methods.

  11. Graphitized-carbon fiber/carbon char fuel

    DOE Patents [OSTI]

    Cooper, John F. (Oakland, CA)

    2007-08-28T23:59:59.000Z

    A method for recovery of intact graphitic fibers from fiber/polymer composites is described. The method comprises first pyrolyzing the graphite fiber/polymer composite mixture and then separating the graphite fibers by molten salt electrochemical oxidation.

  12. advanced sic fiber: Topics by E-print Network

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

    23 24 25 Next Page Last Page Topic Index 1 Photonic Crystal Fibers Advances in Fiber Optics Physics Websites Summary: Photonic Crystal Fibers Advances in Fiber Optics Elliott L....

  13. Continuous Fiber Ceramic Composites (CFCC)

    SciTech Connect (OSTI)

    R. A. Wagner

    2002-12-18T23:59:59.000Z

    This report summarizes work to develop CFCC's for various applications in the Industries of the Future (IOF) and power generation areas. Performance requirements range from relatively modest for hot gas filters to severe for turbine combustor liners and infrared burners. The McDermott Technology Inc. (MTI) CFCC program focused on oxide/oxide composite systems because they are known to be stable in the application environments of interest. The work is broadly focused on dense and porous composite systems depending on the specific application. Dense composites were targeted at corrosion resistant components, molten aluminum handling components and gas turbine combustor liners. The development work on dense composites led to significant advances in fiber coatings for oxide fibers and matrix densification. Additionally, a one-step fabrication process was developed to produce low cost composite components. The program also supported key developments in advanced oxide fibers that resulted in an improved version of Nextel 610 fiber (commercially available as Nextel 650) and significant progress in the development of a YAG/alumina fiber. Porous composite development focused on the vacuum winding process used to produce hot gas filters and infrared burner components.

  14. Inheritance of cotton fiber length and distribution

    E-Print Network [OSTI]

    Braden, Chris Alan

    2006-10-30T23:59:59.000Z

    Fiber quality data from five upland cotton (Gossypium hirsutum L.) genotypes, which were grown at College Station, TX during 2001 and 2002, were subjected to diallel and generation means analyses to determine the potential for improvement of fiber...

  15. Breakthrough: Better Fiber for Better Products

    ScienceCinema (OSTI)

    Griffith, George; Garnier, John;

    2013-05-28T23:59:59.000Z

    Researchers at Idaho National Laboratory have developed a cost-effective method for the continuous production of alpha silicon carbide fiber. The exceptionally strong, lightweight fiber could enable significant performance improvements in many everyday products.

  16. Novel fiber optic polarimetric torsion sensor based on polarization-maintaining photonic crystal fiber

    E-Print Network [OSTI]

    Wai, Ping-kong Alexander

    Novel fiber optic polarimetric torsion sensor based on polarization- maintaining photonic crystal other engineering applications. Compared with conventional torsion sensors, the fiber optic torsion sensors have the distinct advantages of all-fiber-optical sensing. The fiber optic torsion sensors based

  17. Interferometric fiber-optic bending/nano-displacement sensor using plastic dual-core fiber

    E-Print Network [OSTI]

    Skorobogatiy, Maksim

    Interferometric fiber-optic bending/nano-displacement sensor using plastic dual-core fiber H. Qu,1); published August 13, 2014 We demonstrate an interferometric fiber-optic bending/nano-displacement sensor for sensing the displacement. © 2014 Optical Society of America OCIS codes: (060.2370) Fiber optics sensors

  18. Applications of fiber optics in physical protection

    SciTech Connect (OSTI)

    Buckle, T.H. [Sandia National Labs., Albuquerque, NM (United States)

    1994-03-01T23:59:59.000Z

    The purpose of this NUREG is to provide technical information useful for the development of fiber-optic communications and intrusion detection subsystems relevant to physical protection. There are major sections on fiber-optic technology and applications. Other topics include fiber-optic system components and systems engineering. This document also contains a glossary, a list of standards and specifications, and a list of fiber-optic equipment vendors.

  19. High pressure fiber optic sensor system

    SciTech Connect (OSTI)

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

    2013-11-26T23:59:59.000Z

    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.

  20. Fiber-optic displacement sensor system

    E-Print Network [OSTI]

    Cava, Norayda Nora

    1990-01-01T23:59:59.000Z

    . 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... 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...

  1. Fiber optic diffraction grating maker

    DOE Patents [OSTI]

    Deason, Vance A. (Idaho Falls, ID); Ward, Michael B. (Idaho Falls, ID)

    1991-01-01T23:59:59.000Z

    A compact and portable diffraction grating maker comprised of a laser beam, optical and fiber optics devices coupling the beam to one or more evanescent beam splitters, and collimating lenses or mirrors directing the split beam at an appropriate photosensitive material. The collimating optics, the output ends of the fiber optic coupler and the photosensitive plate holder are all mounted on an articulated framework so that the angle of intersection of the beams can be altered at will without disturbing the spatial filter, collimation or beam quality, and assuring that the beams will always intersect at the position of the plate.

  2. Fiber optic diffraction grating maker

    DOE Patents [OSTI]

    Deason, V.A.; Ward, M.B.

    1991-05-21T23:59:59.000Z

    A compact and portable diffraction grating maker is comprised of a laser beam, optical and fiber optics devices coupling the beam to one or more evanescent beam splitters, and collimating lenses or mirrors directing the split beam at an appropriate photosensitive material. The collimating optics, the output ends of the fiber optic coupler and the photosensitive plate holder are all mounted on an articulated framework so that the angle of intersection of the beams can be altered at will without disturbing the spatial filter, collimation or beam quality, and assuring that the beams will always intersect at the position of the plate. 4 figures.

  3. 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

  4. Officials launch Carbon Fiber Technology Facility, announce

    E-Print Network [OSTI]

    Pennycook, Steve

    to reduce carbon fiber's high cost, Danielson noted: "Many of these new clean energy technologies are withinSCIENCE Officials launch Carbon Fiber Technology Facility, announce new manufacturing initiative and a large crowd of local business and civic leaders came to the Carbon Fiber Technology Facility (CFTF

  5. Fiber-type dosimeter with improved illuminator

    DOE Patents [OSTI]

    Fox, R.J.

    1985-12-23T23:59:59.000Z

    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.

  6. Side-emitting fiber optic position sensor

    DOE Patents [OSTI]

    Weiss, Jonathan D. (Albuquerque, NM)

    2008-02-12T23:59:59.000Z

    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.

  7. Optical fiber sensors for harsh environments

    DOE Patents [OSTI]

    Xu, Juncheng; Wang, Anbo

    2007-02-06T23:59:59.000Z

    A diaphragm optic sensor comprises a ferrule including a bore having an optical fiber disposed therein and a diaphragm attached to the ferrule, the diaphragm being spaced apart from the ferrule to form a Fabry-Perot cavity. The cavity is formed by creating a pit in the ferrule or in the diaphragm. The components of the sensor are preferably welded together, preferably by laser welding. In some embodiments, the entire ferrule is bonded to the fiber along the entire length of the fiber within the ferrule; in other embodiments, only a portion of the ferrule is welded to the fiber. A partial vacuum is preferably formed in the pit. A small piece of optical fiber with a coefficient of thermal expansion chosen to compensate for mismatches between the main fiber and ferrule may be spliced to the end of the fiber.

  8. A Model for Fiber Length Attrition in Injection-Molded Long-Fiber Composites

    SciTech Connect (OSTI)

    TuckerIII, Charles L. [University of Illinois, Urbana-Champaign; Phelps, Jay H [University of Illinois, Urbana-Champaign; El-Rahman, Ahmed Abd [University of Illinois, Urbana-Champaign; Kunc, Vlastimil [ORNL

    2013-01-01T23:59:59.000Z

    Long-fiber thermoplastic (LFT) composites consist of an engineering thermoplastic matrix with glass or carbon reinforcing fibers that are initially 10 to 13 mm long. When an LFT is injection molded, flow during mold filling orients the fibers and degrades the fiber length. Fiber orientation models for injection molding are well developed, and special orientation models for LFTs have been developed. Here we present a detailed quantitative model for fiber length attrition in a flowing fiber suspension. The model tracks a discrete fiber length distribution (FLD) at each spatial node. Key equations are a conservation equation for total fiber length, and a breakage rate equation. The breakage rate is based on buckling of fibers due to hydrodynamic forces, when the fibers are in unfavorable orientations. The FLD model is combined with a mold filling simulation to predict spatial and temporal variations in fiber length distribution in a mold cavity during filling. The predictions compare well to experiments on a glassfiber/ PP LFT molding. Fiber length distributions predicted by the model are easily incorporated into micromechanics models to predict the stress-strain behavior of molded LFT materials. Author to whom correspondence should be addressed; electronic mail: ctucker@illinois.edu 1

  9. Interferometric fiber optic displacement sensor

    DOE Patents [OSTI]

    Farah, J.

    1999-04-06T23:59:59.000Z

    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. 23 figs.

  10. Interferometric fiber optic displacement sensor

    DOE Patents [OSTI]

    Farah, John (M.I.T. P.O. Box 397301, Cambridge, MA 02139)

    1999-01-01T23:59:59.000Z

    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.

  11. ON THE GAGE FACTOR FOR OPTICAL FIBER GRATING STRAIN GAGES

    E-Print Network [OSTI]

    Park, Yong-Lae

    ON THE GAGE FACTOR FOR OPTICAL FIBER GRATING STRAIN GAGES Richard J. Black1 , David Zare1 , Levy Oblea1 , Yong-Lae Park1 , Behzad Moslehi1 , and Craig Neslen2 1 Intelligent Fiber Optic Systems of grating and fiber types. KEY WORDS: Fiber-Optic Gratings, Fiber-Optic Sensors, Strain Gage Factor 1

  12. Rugged fiber optic probe for raman measurement

    DOE Patents [OSTI]

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

    1998-01-01T23:59:59.000Z

    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.

  13. ROOM TEMPERATURE STRENGTH DEGRADATION OF OPTICAL FIBERS

    E-Print Network [OSTI]

    Matthewson, M. John

    temperatures. 6 :4 Aging Time (s) Fig. 2. Residual strength of fiber B after aging in deionized water. Aging Time (s) Fig. 4. Data of Griffioen3 for residual strength (strain to failure) of fiber aged in water. 1) Fig. 1 . Residual strength of fiber A after aging in distilled water. io 10 i0 106 io 108 1.0 0.9 0 (0

  14. Programmable optic-fiber delay line

    E-Print Network [OSTI]

    Fang, Shin-Puu

    1991-01-01T23:59:59.000Z

    . Motion of coupled pendula . 4. Circuit schematic of temperature control 5. Basic configuration of electric arc fusion splicer . . . 6. The arrangement of heater 7. The output optical power from one port versus the temperature of the heater 8... ( stripping tool ) and chemical stripping ( acetone or methylene chloride ) technique can be used to remove the protective polymer fiber coating. A commercial Fujikura ct-40 fiber cleaver used skillfully can produce an end surface suitable for fiber fusion...

  15. Fiber-optic displacement sensor system 

    E-Print Network [OSTI]

    Cava, Norayda Nora

    1990-01-01T23:59:59.000Z

    . 54 CHAPTER I INTRODUCTION The implementation of fiber optics in sensor systems is not a new idea; its popularity has steadily increased through the years. Although technological advances have much to do with this, certain characteristic.... The microbending scheme for displacement measurements [10], [11] takes advantage of the fact that when optical fibers are bent at sharp angles, energy will escape through the bent fiber walls. Maximum sensitivity for this scheme is achieved by minimizing...

  16. Fiber optic temperature sensor using a grating on an angled fiber tip

    E-Print Network [OSTI]

    Varadarajan, Harini

    2000-01-01T23:59:59.000Z

    CHAPTER Page 2. Spinning the Photo Resist. 20 3. Laser Exposure 21 4. Photo Resist Developing. . . . 25 5. Etching the Fiber. 26 B. Testing 29 1. Test Setup. 2. Test Results 29 30 V CONCLUSIONS. . 40 VI RECOMMENDED FUTURE RESEARCH . . 41.... Reusable Polishing Puck. . 14 . 17 11. Fibers in the Polishing Puck. 12. Polish Pad Surfaces. 13. Profile of Polished Fibers. 14. Photograph of Polished Fibers on Metal Puck 18 19 . 19 . 20 15. Argon Laser Setup. 22 16. Laser Setup Details. 23...

  17. The Influences of Fiber Feature and Polymer Melt Index on Mechanical Properties of Sugarcane Fiber/Polymer

    E-Print Network [OSTI]

    The Influences of Fiber Feature and Polymer Melt Index on Mechanical Properties of Sugarcane Fiber/Polymer.interscience.wiley.com). ABSTRACT: The fiber characteristics (i.e., the fiber type, morphology, and dimension) and polymer melt flow sugarcane fiber/polymer composites, the HDPE resins with a low MFI value presented high tensile and impact

  18. Natural Fiber Composites: Retting, Preform Manufacture & Molding...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Merit Review and Peer Evaluation Meeting, May 18-22, 2009 -- Washington D.C. lm12smith.pdf More Documents & Publications Natural Fiber Composites: Retting, Preform...

  19. Compound droplet manipulations on fiber arrays

    E-Print Network [OSTI]

    Weyer, Floriane; Dreesen, Laurent; Vandewalle, Nicolas

    2015-01-01T23:59:59.000Z

    Recent works demonstrated that fiber arrays may constitue the basis of an open digital microfluidics. Various processes, such as droplet motion, fragmentation, trapping, release, mixing and encapsulation, may be achieved on fiber arrays. However, handling a large number of tiny droplets resulting from the mixing of several liquid components is still a challenge for developing microreactors, smart sensors or microemulsifying drugs. Here, we show that the manipulation of tiny droplets onto fiber networks allows for creating compound droplets with a high complexity level. Moreover, this cost-effective and flexible method may also be implemented with optical fibers in order to develop fluorescence-based biosensor.

  20. Natural Fiber Composites: Retting, Preform Manufacture & Molding...

    Energy Savers [EERE]

    "Mega" Merit Review 2008 on February 25, 2008 in Bethesda, Maryland. merit08smith3.pdf More Documents & Publications Natural Fiber Composites: Retting, Preform...

  1. Lower Cost, Higher Performance Carbon Fiber

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

    of Energy Presentationname Questions for Today Materials How can the cost of carbon fiber suitable for higher performance applications (H 2 Storage) be developed? H 2...

  2. Efficiency of pump absorption in double-clad fiber amplifiers. I. Fiber with circular symmetry

    E-Print Network [OSTI]

    Kouznetsov, Dmitrii

    Efficiency of pump absorption in double-clad fiber amplifiers. I. Fiber with circular symmetry with an absorbing core is treated as a model for pump absorption in a double-clad optical fiber amplifier. Mode the pump absorption and is analyzed in the speckle-mode approximation for the example of a Kerr

  3. Low-coherent WDM reflectometry for accurate fiber length monitoring

    E-Print Network [OSTI]

    Hui, Rongqing; Thomas, J.; Allen, Christopher Thomas; Fu, B.; Gao, S.

    2003-01-01T23:59:59.000Z

    A fiber-optic low-coherent reflectometer was developed to accurately monitor fiber length variation. A large length-coverage range was obtained by using a fiber Bragg grating array in a wavelength-division-multiplexing ...

  4. auxiliary optical fiber: Topics by E-print Network

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

    19 20 21 22 23 24 25 Next Page Last Page Topic Index 1 Fiber receptacle Collection optics Computer Technologies and Information Sciences Websites Summary: Fiber receptacle ...

  5. acontinuous fiber optic: Topics by E-print Network

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

    19 20 21 22 23 24 25 Next Page Last Page Topic Index 1 Fiber receptacle Collection optics Computer Technologies and Information Sciences Websites Summary: Fiber receptacle ...

  6. absolute fiber optic: Topics by E-print Network

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

    R S; Neto, P A Maia; Nussenzveig, H M 2014-01-01 2 Fiber receptacle Collection optics Computer Technologies and Information Sciences Websites Summary: Fiber receptacle ...

  7. advanced fiber composites: Topics by E-print Network

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

    next (more) Chen, Zheyi 2008-01-01 6 Multilayer composite photonic bandgap fibers ; Composite photonic bandgap fiber materials and fabrication . Open Access Theses and...

  8. alcohol fiber reinforced: Topics by E-print Network

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

    AND SHM OF CARBON FIBER REINFORCED POLYMER PART I : IMPEDANCE ANALYSIS-performance composite materials based on carbon fiber are increasingly used in critical security areas...

  9. Fiber Reinforced Polymer Composite Manufacturing - RFI Part 2...

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

    1056 More Documents & Publications Fiber Reinforced Polymer Composite Manufacturing Workshop Fiber Reinforced Polymer Composite Manufacturing - RFI DE-FOA-0000980: Summary of...

  10. Oak Ridge National Laboratory Carbon Fiber Technology Facility

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

    Oak Ridge National Laboratory Carbon Fiber Technology Facility Low-Cost Carbon Fiber | Proposal Guidelines Proposal Guidelines Proposals should be no more than 5 single spaced...

  11. Renewable, Low-Cost Carbon Fiber for Lightweight Vehicles: Summary...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Renewable, Low-Cost Carbon Fiber for Lightweight Vehicles: Summary Report Renewable, Low-Cost Carbon Fiber for Lightweight Vehicles: Summary Report This report outlines the final...

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

    DOE Patents [OSTI]

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

    1995-03-28T23:59:59.000Z

    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.

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

    DOE Patents [OSTI]

    Wood, C.B.

    1992-12-15T23:59:59.000Z

    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.

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

    DOE Patents [OSTI]

    Wood, Charles B. (Lakewood, CO)

    1992-01-01T23:59:59.000Z

    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.

  15. Microbend fiber-optic temperature sensor

    DOE Patents [OSTI]

    Weiss, J.D.

    1995-05-30T23:59:59.000Z

    A temperature sensor is made of optical fiber into which quasi-sinusoidal microbends have been permanently introduced. In particular, the present invention includes a graded-index optical fiber directing steady light through a section of the optical fiber containing a plurality of permanent microbends. The microbend section of the optical fiber is contained in a thermally expansive sheath, attached to a thermally expansive structure, or attached to a bimetallic element undergoing temperature changes and being monitored. The microbend section is secured to the thermally expansive sheath which allows the amplitude of the microbends to decrease with temperature. The resultant increase in the optical fiber`s transmission thus allows temperature to be measured. The plural microbend section of the optical fiber is secured to the thermally expansive structure only at its ends and the microbends themselves are completely unconstrained laterally by any bonding agent to obtain maximum longitudinal temperature sensitivity. Although the permanent microbends reduce the transmission capabilities of fiber optics, the present invention utilizes this phenomenon as a transduction mechanism which is optimized to measure temperature. 5 figs.

  16. Moisture Penetration Through Optical Fiber Coatings

    E-Print Network [OSTI]

    Matthewson, M. John

    Moisture Penetration Through Optical Fiber Coatings J. L. Armstrong, M. J. Matthewson and C. R for measuring the diffusion coefficients of water vapor through optical fiber polymer coatings has been. Kurkjian #12;732 International Wire & Cable Symposium Proceedings 1998 Moisture Penetration Through Optical

  17. TRS-Fiber Optic Classifier Sensor Installation

    E-Print Network [OSTI]

    Prevedouros, Panos D.

    TRS-Fiber Optic Classifier Sensor Installation The sensor that the Traffic Recording System (TRS) uses is the Flexsense Portable Fiberoptic Sensor System by Optical Sensor Systems. This includes two is undetected by the TRS. The user must make sure that the sensors do not get bent or twisted or the fiber optic

  18. The transport properties of activated carbon fibers

    SciTech Connect (OSTI)

    di Vittorio, S.L. (Massachusetts Inst. of Tech., Cambridge, MA (USA). Dept. of Materials Science and Engineering); Dresselhaus, M.S. (Massachusetts Inst. of Tech., Cambridge, MA (USA). Dept. of Electrical Engineering and Computer Science Massachusetts Inst. of Tech., Cambridge, MA (USA). Dept. of Physics); Endo, M. (Shinshu Univ., Nagano (Japan). Dept. of Electrical Engineering); Issi, J-P.; Piraux, L.

    1990-07-01T23:59:59.000Z

    The transport properties of activated isotropic pitch-based carbon fibers with surface area 1000 m{sup 2}/g have been investigated. We report preliminary results on the electrical conductivity, the magnetoresistance, the thermal conductivity and the thermopower of these fibers as a function of temperature. Comparisons are made to transport properties of other disordered carbons. 19 refs., 4 figs.

  19. Carbon fiber manufacturing via plasma technology

    DOE Patents [OSTI]

    Paulauskas, Felix L. (Knoxville, TN); Yarborough, Kenneth D. (Oak Ridge, TN); Meek, Thomas T. (Knoxville, TN)

    2002-01-01T23:59:59.000Z

    The disclosed invention introduces a novel method of manufacturing carbon and/or graphite fibers that avoids the high costs associated with conventional carbonization processes. The method of the present invention avoids these costs by utilizing plasma technology in connection with electromagnetic radiation to produce carbon and/or graphite fibers from fully or partially stabilized carbon fiber precursors. In general, the stabilized or partially stabilized carbon fiber precursors are placed under slight tension, in an oxygen-free atmosphere, and carbonized using a plasma and electromagnetic radiation having a power input which is increased as the fibers become more carbonized and progress towards a final carbon or graphite product. In an additional step, the final carbon or graphite product may be surface treated with an oxygen-plasma treatment to enhance adhesion to matrix materials.

  20. Solar light transmission of polymer optical fibers

    SciTech Connect (OSTI)

    Tekelioglu, Murat [Mechanical Engineering Department, University of Nevada, Reno, NV 89557 (United States); Wood, Byard D. [Mechanical and Aerospace Engineering Department, Utah State University, Logan, UT 84322 (United States)

    2009-11-15T23:59:59.000Z

    Light transfer (10 m) has been shown in recent experiments that used large-core optical fibers. Theoretical models are not extensive, however, and a further correlation between the theory and experiments has not been given. In this paper, straight and bent fiber subsystem models are introduced with skew and meridional rays to predict the light transmission of POFs (plastic optical fibers). Such fibers have been realized, for example, in HSL (hybrid solar lighting) systems. The purpose of this paper is to combine the straight and bent fiber subsystems to estimate the light transmission of HSL systems. It is shown that meridional rays, for which the optical-loss parameters were estimated, better represent the experimental results compared to skew rays ({+-}5.3% vs {+-}24.7% of %-difference). Model predictions were compared with the results of a commercial software. Sensitivity analysis on the subsystems indicated the most-to-least significant parameters in light transmission. (author)

  1. Remotely readable fiber optic compass

    DOE Patents [OSTI]

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

    1986-01-01T23:59:59.000Z

    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.

  2. Remotely readable fiber optic compass

    DOE Patents [OSTI]

    Migliori, A.; Swift, G.W.; Garrett, S.L.

    1985-04-30T23:59:59.000Z

    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.

  3. Method for preparing polyaniline fibers

    DOE Patents [OSTI]

    Mattes, Benjamin R. (Santa Fe, NM); Wang, Hsing-Lin (Los Alamos, NM)

    2000-01-01T23:59:59.000Z

    Stable, concentrated solutions of high molecular weight polyaniline. In order to process high quality fibers and other articles possessing good mechanical properties, it is known that solution concentrations of the chosen polymer should be in the range from 15-30% (w/w). Moreover, it is desirable to use the highest molecular weight consistent with the solubility properties of the polymer. However, such solutions are inherently unstable, forming gels before processing can be achieved. The present invention describes the addition gel inhibitors (GIs) to the polymer solution, thereby permitting high concentrations (>15% (w/w)) of high molecular weight ((M.sub.w)>120,000, and (M.sub.n)>30,000) emeraldine base (EB) polyaniline to be dissolved. Secondary amines have been used for this purpose in concentrations which are small compared to those which might otherwise be used in a cosolvent role therefor. The resulting solutions are useful for generating excellent fibers, films, coatings and other objects, since the solutions are stable for significant time periods, and the GIs are present in too small concentrations to cause polymer deterioration. It is demonstrated that the GIs found to be useful do not act as cosolvents, and that gelation times of the solutions are directly proportional to the concentration of GI. In particular, there is a preferred concentration of GI, which if exceeded causes structural and electrical conductivity degradation of resulting articles. Heating of the solutions significantly improves solubility.

  4. Microbend fiber-optic temperature sensor

    DOE Patents [OSTI]

    Weiss, Jonathan D. (Albuquerque, NM)

    1995-01-01T23:59:59.000Z

    A temperature sensor is made of optical fiber into which quasi-sinusoidal microbends have been permanently introduced. In particular, the present invention includes a graded-index optical fiber directing steady light through a section of the optical fiber containing a plurality of permanent microbends. The microbend section of the optical fiber is contained in a thermally expansive sheath, attached to a thermally expansive structure, or attached to a bimetallic element undergoing temperature changes and being monitored. The microbend section is secured to the thermally expansive sheath which allows the amplitude of the microbends to decrease with temperature. The resultant increase in the optical fiber's transmission thus allows temperature to be measured. The plural microbend section of the optical fiber is secured to the thermally expansive structure only at its ends and the microbends themselves are completely unconstrained laterally by any bonding agent to obtain maximum longitudinal temperature sensitivity. Although the permanent microbends reduce the transmission capabilities of fiber optics, the present invention utilizes this phenomenon as a transduction mechanism which is optimized to measure temperature.

  5. 2 micron femtosecond fiber laser

    DOE Patents [OSTI]

    Liu, Jian; Wan, Peng; Yang, Lihmei

    2014-07-29T23:59:59.000Z

    Methods and systems for generating femtosecond fiber laser pulses are disclose, including generating a signal laser pulse from a seed laser oscillator; using a first amplifier stage comprising an input and an output, wherein the signal laser pulse is coupled into the input of the first stage amplifier and the output of the first amplifier stage emits an amplified and stretched signal laser pulse; using an amplifier chain comprising an input and an output, wherein the amplified and stretched signal laser pulse from the output of the first amplifier stage is coupled into the input of the amplifier chain and the output of the amplifier chain emits a further amplified, stretched signal laser pulse. Other embodiments are described and claimed.

  6. Fiber optic D dimer biosensor

    DOE Patents [OSTI]

    Glass, R.S.; Grant, S.A.

    1999-08-17T23:59:59.000Z

    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. 4 figs.

  7. Coated Fiber Neutron Detector Test

    SciTech Connect (OSTI)

    Lintereur, Azaree T.; Ely, James H.; Kouzes, Richard T.; Stromswold, David C.

    2009-10-23T23:59:59.000Z

    Radiation portal monitors used for interdiction of illicit materials at borders include highly sensitive neutron detection systems. The main reason for having neutron detection capability is to detect fission neutrons from plutonium. The currently deployed radiation portal monitors (RPMs) from Ludlum and Science Applications International Corporation (SAIC) use neutron detectors based upon 3He-filled gas proportional counters, which are the most common large neutron detector. There is a declining supply of 3He in the world, and thus, methods to reduce the use of this gas in RPMs with minimal changes to the current system designs and sensitivity to cargo-borne neutrons are being investigated. Reported here are the results of tests of the 6Li/ZnS(Ag)-coated non-scintillating plastic fibers option. This testing measured the required performance for neutron detection efficiency and gamma ray rejection capabilities of a system manufactured by Innovative American Technology (IAT).

  8. Distributed fiber optic intrusion sensor system for monitoring long perimeters

    E-Print Network [OSTI]

    Juarez, Juan C.

    2009-06-02T23:59:59.000Z

    Perturbation ........................ 17 G. Frequency Drift Measurement................................................................... 19 III ERBIUM DOPED FIBER LASER CHARACTERIZATION........................ 22 A. Er:Fiber Laser... .................................................................................................... 22 12. Experimental setup for fiber laser used in the intrusion sensor system ............. 24 13. Spectral linewidth scan of Erbium doped fiber laser ......................................... 24 14. Delayed self-heterodyne test setup...

  9. Compact, stable 1 ghz femtosecond er-doped fiber lasers

    E-Print Network [OSTI]

    Byun, Hyunil

    We demonstrate a high-repetition-rate soliton fiber laser that is based on highly-doped anomalously-dispersive erbium-doped fiber. By splicing an 11-mm single mode fiber to the erbium-doped fiber, thermal damage of the ...

  10. Diode pumped alkali vapor fiber laser

    DOE Patents [OSTI]

    Payne, Stephen A. (Castro Valley, CA); Beach, Raymond J. (Livermore, CA); Dawson, Jay W. (Livermore, CA); Krupke, William F. (Pleasanton, CA)

    2007-10-23T23:59:59.000Z

    A method and apparatus is provided for producing near-diffraction-limited laser light, or amplifying near-diffraction-limited light, in diode pumped alkali vapor photonic-band-gap fiber lasers or amplifiers. Laser light is both substantially generated and propagated in an alkali gas instead of a solid, allowing the nonlinear and damage limitations of conventional solid core fibers to be circumvented. Alkali vapor is introduced into the center hole of a photonic-band-gap fiber, which can then be pumped with light from a pump laser and operated as an oscillator with a seed beam, or can be configured as an amplifier.

  11. Diode pumped alkali vapor fiber laser

    DOE Patents [OSTI]

    Payne, Stephen A. (Castro Valley, CA); Beach, Raymond J. (Livermore, CA); Dawson, Jay W. (Livermore, CA); Krupke, William F. (Pleasanton, CA)

    2006-07-26T23:59:59.000Z

    A method and apparatus is provided for producing near-diffraction-limited laser light, or amplifying near-diffraction-limited light, in diode pumped alkali vapor photonic-band-gap fiber lasers or amplifiers. Laser light is both substantially generated and propagated in an alkali gas instead of a solid, allowing the nonlinear and damage limitations of conventional solid core fibers to be circumvented. Alkali vapor is introduced into the center hole of a photonic-band-gap fiber, which can then be pumped with light from a pump laser and operated as an oscillator with a seed beam, or can be configured as an amplifier.

  12. Microbend fiber-optic chemical sensor

    DOE Patents [OSTI]

    Weiss, Jonathan D. (Albuquerque, NM)

    2002-01-01T23:59:59.000Z

    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.

  13. Characterization of Fiber Optic CMM Probe System

    SciTech Connect (OSTI)

    K.W.Swallow

    2007-05-15T23:59:59.000Z

    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.

  14. Dynamics of flexible fibers in shear flow

    E-Print Network [OSTI]

    Agnieszka M. Slowicka; Eligiusz Wajnryb; Maria L. Ekiel-Jezewska

    2015-04-03T23:59:59.000Z

    Dynamics of flexible non-Brownian fibers in shear flow at low-Reynolds-number are analyzed numerically for a wide range of the ratios A of the fiber bending force to the viscous drag force. Initially, the fibers are aligned with the flow, and later they move in the plane perpendicular to the flow vorticity. A surprisingly rich spectrum of different modes is observed when the value of A is systematically changed, with sharp transitions between coiled and straightening out modes, period-doubling bifurcations from periodic to migrating solutions, irregular dynamics and chaos.

  15. Oxidation induced stress-rupture of fiber bundles

    SciTech Connect (OSTI)

    Lara-Curzio, E.

    1997-03-01T23:59:59.000Z

    The effect of oxidation on the stress-rupture behavior of fiber bundles was modeled. It is shown that oxidation-induced fiber strength degradation results in the delayed failure of the associated fiber bundle and that the fiber bundle strength decreases with time as t{sup {minus}1/4}. It is also shown that the temperature dependence of the bundle loss of strength reflects the thermal dependence of the mechanism controlling the oxidation of the fibers. The effect of gauge length on the fiber bundle strength was also analyzed. Numerical examples are presented for the special case of Nicalon{trademark} fibers.

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

    E-Print Network [OSTI]

    Kleinfeld, David

    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

  17. The effects of fiber waviness on the compressive response of fiber reinforced composite materials

    E-Print Network [OSTI]

    Davis, John Jerome

    1989-01-01T23:59:59.000Z

    equation (5) yields an expression for the fiber strain energy: Uf =EftfL [Z + ? Z( ? ) (A + 2AA ) t L + ? ( ? ) (A+4AA+4AA )]+ ( ? ) A (21) Matrix Dlsplacements The matrix displacements are determined in terms of the fiber displacements. The bending... on the lower sur- face of the fiber and uf?corresponds to the displacement on the upper surface of the fiber. These are also shown in Figure 5. The mathematical expressions for these quantities are given by: XX ufu = u (x, tr) = ? tf A ? cos (24) uti = u...

  18. Optical fiber pressure and acceleration sensor fabricated on a fiber endface

    DOE Patents [OSTI]

    Zhu, Yizheng; Wang, Xingwei; Xu, Juncheng; Wang, Anbo

    2006-05-30T23:59:59.000Z

    A fiber optic sensor has a hollow tube bonded to the endface of an optical fiber, and a diaphragm bonded to the hollow tube. The fiber endface and diaphragm comprise an etalon cavity. The length of the etalon cavity changes when applied pressure or acceleration flexes the diaphragm. The entire structure can be made of fused silica. The fiber, tube, and diaphragm can be bonded with a fusion splice. The present sensor is particularly well suited for measuring pressure or acceleration in high temperature, high pressure and corrosive environments (e.g., oil well downholes and jet engines). The present sensors are also suitable for use in biological and medical applications.

  19. Inheritance of Cotton Fiber Length and Strength

    E-Print Network [OSTI]

    Joy, Kolbyn Seth

    2014-04-23T23:59:59.000Z

    hybrids. General combining ability (GCA) and specific combining ability (SCA) were estimated according to Griffing’s diallel Model I, Method 4 for lint percent, high volume instrument (HVI) upper half mean length (UHML), fiber bundle strength (Str...

  20. Multi-Scale Reinforced Carbon Fiber Nanocomposites 

    E-Print Network [OSTI]

    VanRooyen, Ainsley

    2008-08-19T23:59:59.000Z

    Carbon fiber polymer composites are utilized in many industries including in commercial and military aircraft and space vehicles because of their lighter weight and superior strength compared to aluminum and steel. Due to the insulating nature...

  1. Fiber coupled optical spark delivery system

    DOE Patents [OSTI]

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

    2008-08-12T23:59:59.000Z

    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.

  2. Fiber laser coupled optical spark delivery system

    DOE Patents [OSTI]

    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

    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.

  3. Sandia National Laboratories: composite fibers typically aligned...

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

    composite fibers typically aligned in a 45 pattern with respect to the blade axis New Material Tests Show Biaxial Laminate Creep Is Important for Large Wind-Turbine Blades On...

  4. Fiber-Optic Sources of Quantum Entanglement

    E-Print Network [OSTI]

    P. Kumar; X. Li; M. Fiorentino; P. L. Voss; J. E. Sharping; G. A. Barbosa

    2002-09-20T23:59:59.000Z

    We present a fiber-based source of polarization-entangled photon pairs that is well suited for quantum communication applications in the 1.5$\\mu$m band of standard telecommunication fiber. Quantum-correlated signal and idler photon pairs are produced when a nonlinear-fiber Sagnac interferometer is pumped in the anomalous-dispersion region of the fiber. Recently, we have demonstrated nonclassical properties of such photon pairs by using Geiger-mode InGaAs/InP avalanche photodiodes. Polarization entanglement in the photon pairs can be created by pumping the Sagnac interferometer with two orthogonally polarized pulses. In this case the parametrically scattered signal-idler photons yield biphoton interference with $>$90% visibility in coincidence detection, while no interference is observed in direct detection of either the signal or the idler photons.

  5. Structural retrofitting using fiber reinforced polymers

    E-Print Network [OSTI]

    Dumas, Pierre, M. Eng. Massachusetts Institute of Technology

    2012-01-01T23:59:59.000Z

    Over the past decades, fiber reinforced polymers (FRP) have been widely used in the aeronautical and naval industries. Being more costly than conventional Civil Engineering materials such as steel or concrete, they have ...

  6. Fiber optics welder having movable aligning mirror

    DOE Patents [OSTI]

    Higgins, Robert W. (Los Alamos, NM); Robichaud, Roger E. (Jemez Springs, NM)

    1981-01-01T23:59:59.000Z

    A system for welding fiber optic waveguides together. The ends of the two fibers to be joined together are accurately, collinearly aligned in a vertical orientation and subjected to a controlled, diffuse arc to effect welding and thermal conditioning. A front-surfaced mirror mounted at a 45.degree. angle to the optical axis of a stereomicroscope mounted for viewing the junction of the ends provides two orthogonal views of the interface during the alignment operation.

  7. Fiber optic probe for light scattering measurements

    DOE Patents [OSTI]

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

    1995-01-01T23:59:59.000Z

    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.

  8. Fiber optic probe for light scattering measurements

    DOE Patents [OSTI]

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

    1993-01-01T23:59:59.000Z

    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.

  9. The effect of irregular fiber distribution and error in assumed transverse fiber CTE on thermally induced fiber/matrix interfacial stresses

    E-Print Network [OSTI]

    Zu, Seung-Don

    2006-08-16T23:59:59.000Z

    Thermally induced interfacial stress states between fiber and matrix at cryogenic temperature were studied using three-dimensional finite element based micromechanics. Mismatch of the coefficient of thermal expansion between fiber and matrix...

  10. Effect of Fiber Orientation and Ply Mix on Fiber Reinforced Polymer-Confined Concrete

    E-Print Network [OSTI]

    Entekhabi, Dara

    concrete by testing under uniaxial compression a designed array of plain concrete cylinders wrappedEffect of Fiber Orientation and Ply Mix on Fiber Reinforced Polymer-Confined Concrete Ching Au, A concrete lateral strain while the kink stress was found to upshift with increasing jacket stiffness

  11. FIBER OPTIC SENSING OF A CARBON FIBER PRESfRESSED CONCRETE HIGHWAY BRIDGE

    E-Print Network [OSTI]

    composite material replacementsfor steel. These carbon fiber reinforced polymers are practically immune of the civil infrastructure [Dunker and Rabbat 1993]. Carbon fiber based composite materials are practically to corrosion. Since composite materials are unproven in their substitution for steel in concrete structures

  12. All-fiber Passively Q-switched Laser Based on Tm3+-doped Tellurite Fiber

    E-Print Network [OSTI]

    Kuan, Pei-Wen; Li, Kefeng; Zhang, Lei; Fan, Xiaokang; Hasan, Tawfique; Wang, Fengqiu; Hu, Lili

    2014-12-24T23:59:59.000Z

    ]. The composite has been prepared from the CNT aqueous dispersions according to the procedure described in Ref. [21]. The total length of the fiber laser cavity is ~2.8 m. The tellurite fiber output end, which has a ~11.9% Fresnel reflection, is used...

  13. Activated carbon fibers and engineered forms from renewable resources

    DOE Patents [OSTI]

    Baker, Frederick S.

    2010-06-01T23:59:59.000Z

    A method of producing activated carbon fibers (ACFs) includes the steps of providing a natural carbonaceous precursor fiber material, blending the carbonaceous precursor material with a chemical activation agent to form chemical agent-impregnated precursor fibers, spinning the chemical agent-impregnated precursor material into fibers, and thermally treating the chemical agent-impregnated precursor fibers. The carbonaceous precursor material is both carbonized and activated to form ACFs in a single step. The method produces ACFs exclusive of a step to isolate an intermediate carbon fiber.

  14. Evaluations of fiber optic sensors for interior applications

    SciTech Connect (OSTI)

    Sandoval, M.W.; Malone, T.P.

    1996-02-01T23:59:59.000Z

    This report addresses the testing and evaluation of commercial fiber optic intrusion detection systems in interior applications. The applications include laying optical fiber cable above suspended ceilings to detect removal of ceiling tiles, embedding optical fibers inside a tamper or item monitoring blanket that could be placed over an asset, and installing optical fibers on a door to detect movement or penetration. Detection capability of the fiber optic sensors as well as nuisance and false alarm information were focused on during the evaluation. Fiber optic sensor processing, system components, and system setup are described.

  15. Activated carbon fibers and engineered forms from renewable resources

    DOE Patents [OSTI]

    Baker, Frederick S

    2013-02-19T23:59:59.000Z

    A method of producing activated carbon fibers (ACFs) includes the steps of providing a natural carbonaceous precursor fiber material, blending the carbonaceous precursor material with a chemical activation agent to form chemical agent-impregnated precursor fibers, spinning the chemical agent-impregnated precursor material into fibers, and thermally treating the chemical agent-impregnated precursor fibers. The carbonaceous precursor material is both carbonized and activated to form ACFs in a single step. The method produces ACFs exclusive of a step to isolate an intermediate carbon fiber.

  16. advanced fiber-optic monitoring: Topics by E-print Network

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

    23 24 25 Next Page Last Page Topic Index 1 Photonic Crystal Fibers Advances in Fiber Optics Physics Websites Summary: Photonic Crystal Fibers Advances in Fiber Optics Elliott L....

  17. MICROSTRUCTURED OPTICAL FIBER BRAGG GRATING SENSORS FOR STRUCTURAL HEALTH MONITORING APPLICATIONS

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    MICROSTRUCTURED OPTICAL FIBER BRAGG GRATING SENSORS FOR STRUCTURAL HEALTH MONITORING APPLICATIONS optical fiber Bragg grating (MOFBG) sensors for structural health monitoring applications. We then focus, optical fiber sensor, fiber Bragg grating, structural health monitoring INTRODUCTION Microstructured

  18. UPTAKE OF RADIONUCLIDE METALS BY SPME FIBERS

    SciTech Connect (OSTI)

    Duff, M; S Crump, S; Robert02 Ray, R; Keisha Martin, K; Donna Beals, D

    2006-08-28T23:59:59.000Z

    The Federal Bureau of Investigation (FBI) Laboratory currently does not have on site facilities for handling radioactive evidentiary materials and there are no established FBI methods or procedures for decontaminating high explosive (HE) and fire debris (FD) evidence while maintaining evidentiary value. One experimental method for the isolation of HE and FD residue involves using solid phase microextraction or SPME fibers to remove residue of interest. Due to their high affinity for organics, SPME fibers should have little affinity for most metals. However, no studies have measured the affinity of radionuclides for SPME fibers. The focus of this research was to examine the affinity of dissolved radionuclide ({sup 239/240}Pu, {sup 238}U, {sup 237}Np, {sup 85}Sr, {sup 133}Ba, {sup 137}Cs, {sup 60}Co and {sup 226}Ra) and stable radionuclide surrogate metals (Sr, Co, Ir, Re, Ni, Ba, Cs, Nb, Zr, Ru, and Nd) for SPME fibers at the exposure conditions that favor the uptake of HE and FD residues. Our results from radiochemical and mass spectrometric analyses indicate these metals have little measurable affinity for these SPME fibers during conditions that are conducive to HE and FD residue uptake with subsequent analysis by liquid or gas phase chromatography with mass spectrometric detection.

  19. The effect of neutron irradiation on silicon carbide fibers

    SciTech Connect (OSTI)

    Newsome, G.A. [Lockheed Martin Corp., Schenectady, NY (United States)

    1997-01-01T23:59:59.000Z

    Nine types of SiC fiber have been exposed to neutron radiation in the Advanced Test Reactor at 250 C for various lengths of time ranging from 83 to 128 days. The effects of these exposures have been initially determined using scanning electron microscopy. The fibers tested were Nicalon{trademark} CG, Tyranno, Hi-Nicalon{trademark}, Dow Corning SiC, Carborundum SiC, Textron SCS-6, polymethysilane (PMS) derived SiC from the University of Michigan, and two types of MER SiC fiber. This covers a range of fibers from widely used commercial fibers to developmental fibers. Consistent with previous radiation experiments, Nicalon fiber was severely degraded by the neutron irradiation. Similarly, Tyranno suffered severe degradation. The more advanced fibers which approach the composition and properties of SiC performed well under irradiation. Of these, the Carborundum SiC fiber appeared to perform the best. The Hi-Nicalon and Dow Corning Fibers exhibited good general stability, but also appear to have some surface roughening. The MER fibers and the Textron SCS-6 fibers both had carbon cores which adversely influenced the overall stability of the fibers.

  20. The effect of processing on strength of Nicalon fibers in Nicalon fiber-SiC matrix composites

    SciTech Connect (OSTI)

    Singh, D.; Singh, J.P.

    1991-12-01T23:59:59.000Z

    Degradation of strength of Nicalon (silicon carbide) fibers during processing of Nicalon fiber-SiC matrix composites was studied. Strength distribution of as-fabricated Nicalon fibers was obtained via bundle tests. Whereas, strengths of fractured fibers in Nicalon fiber-reinforced SiC matrix composite specimens were estimated by measuring fracture mirror radii. Comparison of fracture probability plots indicate significant differences in the behavior of the as-fabricated fibers and those in the composite. Possible causes leading to these differences are discussed.

  1. Communication Uniaxial compression in carbon fiber-reinforced cement, sensed by

    E-Print Network [OSTI]

    Chung, Deborah D.L.

    -based and unsized, as obtained from Ashland Petroleum (Ashland, KY). The fiber diameter was 15 mm. The nominal fiber

  2. Interlayer toughening of fiber composite flywheel rotors

    DOE Patents [OSTI]

    Groves, S.E.; Deteresa, S.J.

    1998-07-14T23:59:59.000Z

    An interlayer toughening mechanism is described to mitigate the growth of damage in fiber composite flywheel rotors for long application. The interlayer toughening mechanism may comprise one or more tough layers composed of high-elongation fibers, high-strength fibers arranged in a woven pattern at a range from 0{degree} to 90{degree} to the rotor axis and bound by a ductile matrix material which adheres to and is compatible with the materials used for the bulk of the rotor. The number and spacing of the tough interlayers is a function of the design requirements and expected lifetime of the rotor. The mechanism has particular application in uninterruptable power supplies, electrical power grid reservoirs, and compulsators for electric guns, as well as electromechanical batteries for vehicles. 2 figs.

  3. Interlayer toughening of fiber composite flywheel rotors

    DOE Patents [OSTI]

    Groves, Scott E. (Brentwood, CA); Deteresa, Steven J. (Livermore, CA)

    1998-01-01T23:59:59.000Z

    An interlayer toughening mechanism to mitigate the growth of damage in fiber composite flywheel rotors for long application. The interlayer toughening mechanism may comprise one or more tough layers composed of high-elongation fibers, high-strength fibers arranged in a woven pattern at a range from 0.degree. to 90.degree. to the rotor axis and bound by a ductile matrix material which adheres to and is compatible with the materials used for the bulk of the rotor. The number and spacing of the tough interlayers is a function of the design requirements and expected lifetime of the rotor. The mechanism has particular application in uninterruptable power supplies, electrical power grid reservoirs, and compulsators for electric guns, as well as electromechanical batteries for vehicles.

  4. Imaging techniques utilizing optical fibers and tomography

    SciTech Connect (OSTI)

    Wilke, M.; King, N.S.P.; Gray, N.; Johnson, D.; Esquibel, D.; Nedrow, P.; Ishiwata, S.

    1985-01-01T23:59:59.000Z

    Two-dimensional, time-dependent images generated by neutrons, gamma rays, and x-rays incident on fast scintillators are relayed to streak and video cameras over optical fibers. Three dimensions, two spatial and one temporal, have been reduced to two, one in space and time utilizing sampling methods permitting reconstruction of a time-dependent, two-dimensional image subsequent to data recording. The manner in which the sampling is done optimized the ability to reconstruct the image via a maximization of entropy algorithm. This method uses four linear fiber optic arrays typically 30 meters long and up to 35 elements each. A further refinement of this technique collapses the linear array information into four single fibers by wavelength multiplexing. This permits economical transmission of the data over kilometer distances to the recording equipment.

  5. Carbon Fiber Damage in Particle Beam

    E-Print Network [OSTI]

    Dehning, B; Kroyer, T; Meyer, M; Sapinski, M

    2011-01-01T23:59:59.000Z

    Carbon fibers are commonly used as moving targets in beam wire scanners. The heating of the fiber due to energy loss of the particles travelling through is simulated with Geant4. The heating induced by the beam electromagnetic field is estimated with ANSYS. The heat transfer and sublimation processes are modelled. Due to the model nonlinearity, a numerical approach based on discretization of the wire movement is used to solve it for particular beams. Radiation damage to the fiber is estimated with SRIM. The model is tested with available SPS and LEP data and a dedicated damage test on the SPS beam is performed followed by a post-mortem analysis of the wire remnants. Predictions for the LHC beams are made.

  6. THROUGH THICKNESS LASER JOINING OF CONTINUOUS GLASS FIBER FABRIC REINFORCEMENT

    E-Print Network [OSTI]

    Yao, Y. Lawrence

    THROUGH THICKNESS LASER JOINING OF CONTINUOUS GLASS FIBER FABRIC REINFORCEMENT Paper Number 405 Huade Tan, Gen Satoh, Y. Lawrence Yao Manufacturing Research Laboratory Department of Mechanical and propagation is a major failure mode in structural composite applications. Manufacturing induced fiber

  7. Characterization by mercury porosimetry of nonwoven fiber media with deformation

    E-Print Network [OSTI]

    Rutledge, Gregory C.

    The porosity and pore diameter distribution are important characteristics of nonwoven fiber media. With the advent of electrospinning, the production of mats of nonwoven fibrous materials with fiber diameters in the 0.1-10 ...

  8. Frequency-dissymmetric parametric sideband generation in a microstructured fiber

    E-Print Network [OSTI]

    Boyer, Edmond

    to all-fiber quantum communication devices useful in the field of quantum communication net- works [7]. The development of photonic crystal fibers (PCFs) [8] led to a leap forward in the field of nonlinear optics

  9. Partial-Flow Diesel Particulate Filter of Sintered Metal Fiber...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Partial-Flow Diesel Particulate Filter of Sintered Metal Fiber Fleece Partial-Flow Diesel Particulate Filter of Sintered Metal Fiber Fleece Poster presented at the 16th Directions...

  10. alloy fiber reinforced: Topics by E-print Network

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

    of FRPs Conditioned FRP-RC Beams Using FiberOptic Sensors, Slenderness Efle 3 Carbon Fiber Reinforced Polymer (CFRP) as Reinforcement for Concrete Beam CiteSeer Summary:...

  11. Optical fiber smart structures applied to secure containers

    SciTech Connect (OSTI)

    Sliva, P.; Gordon, N.R.; Stahl, K.A.; Simmon, K.L.; Anheier, N.C.

    1994-07-01T23:59:59.000Z

    A prototype secure container was prepared that uses continually monitored optical fiber as the smart structure. A small ({approx}7.6 cm {times} 10.2 cm {times} 12.7 cm), matchbox-shaped container consisting of an inner drawer within an outer shell was fabricated from polymer resin. The optical fiber was sandwiched between additional non-optical, strength-promoting fibers and embedded into the polymer. The additional non-optical fiber provides strength to the container, protects the optical fiber from damage, hides the fiber and acts as a decoy. The optical fiber was wound with a winding density such that a high probability of fiber damage would be expected if the container was penetrated.

  12. Intrinsic Fabry-Perot optical fiber sensors and their multiplexing

    DOE Patents [OSTI]

    Wang, Anbo (Blacksburg, VA)

    2007-12-11T23:59:59.000Z

    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.

  13. Fiber Supercapacitors DOI: 10.1002/anie.201006062

    E-Print Network [OSTI]

    Wang, Zhong L.

    Fiber Supercapacitors DOI: 10.1002/anie.201006062 Fiber Supercapacitors Made of Nanowire storage devices such as batteries and supercapacitors need to be explored, but future develop- ment. In recent years, electrochemical supercapacitors have attracted much attention as novel energy

  14. Fatigue Enhancement of a Carbon Fiber Reinforced Nanocomposite

    E-Print Network [OSTI]

    Wilkerson, Justin W.

    2008-08-19T23:59:59.000Z

    The primary objective of the present investigation is to study the fatigue characteristics of a woven carbon fiber reinforced polymer which has been modified with either amine or fluorine functionalized carbon nanotubes on the fiber-matrix interface...

  15. Natural fiber reinforced aerated concrete : an experimental investigation

    E-Print Network [OSTI]

    Garbis, Leonidia Maria

    2013-01-01T23:59:59.000Z

    The purpose of this study is to compare existing research with aerated concrete and fiber reinforcement to original experiments completed investigating the benefits of adding natural fiber tensile reinforcement to aerated ...

  16. Distributed fiber optic intrusion sensor system for monitoring long perimeters 

    E-Print Network [OSTI]

    Juarez, Juan C.

    2009-06-02T23:59:59.000Z

    A distributed sensor using an optical fiber for detecting and locating intruders over long perimeters (>10 km) is described. Phase changes resulting from either the pressure of the intruder on the ground immediately above the buried fiber or from...

  17. SABIC's Carbon Fiber-Reinforced Material used to Produce the...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    SABIC's Carbon Fiber-Reinforced Material used to Produce the World's First 3D-Printed Vehicle at IMTS 2014 SABIC's Carbon Fiber-Reinforced Material used to Produce the World's...

  18. Hybrid carbon fiber composite lattice truss structures T. George a,

    E-Print Network [OSTI]

    Wadley, Haydn

    carbon fiber face sheets and infused with an epoxy resin using a vacuum assisted resin transfer molding that was stitched to CFRP faces using Kevlar fiber to form a resin infused sandwich panel. The nodes of the braided

  19. advanced dti fiber: Topics by E-print Network

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

    L, Baley C. Influence of the sampling area of the stem on the mechanical properties of hemp fibers Paris-Sud XI, Universit de 27 Fiber Optic Sensor Interrogation Advancements...

  20. Effects of fiber direction on heat conduction in unidirectionally aligned fiber composites

    E-Print Network [OSTI]

    Havis, Clark Reagan

    1987-01-01T23:59:59.000Z

    Composites, " Journal of Applied Mechanics, Vol. 46, pp. 563-567. 44 APPENDIX A NOMENCI ATURE 2G A A d If k k?k, Iy kf km k?k, k? k?, y, k? kgs~ k~v~ kss i, m) B qs 9cai~ q~s S T W s&p~s /f 'y lF V Vf im r fiber spacing... of MASTER OF SCIENCE December 1987 Major Subject: Mechanical Engineering EFFECTS OF FIBER DIRECTION ON HEAT CONDUCTION IN UNIDIRECTIONALLY ALIGNED FIBER COMPOSITES A Thesis CLARK REAGAN HAVIS Approved as to style and content by: G. P. Peterson...

  1. Effects of fiber direction on heat conduction in unidirectionally aligned fiber composites 

    E-Print Network [OSTI]

    Havis, Clark Reagan

    1987-01-01T23:59:59.000Z

    APPENDIX D: EXPERIMENTAL DATA. . . . . . . . . . 52 VITA . 128 LIST OF FIGURES Figure 1. Composite fiber types . 2. Aligned fiber coxnposites 3. Fiber alignment 4. Principal conductivities 5. Fundamental element used in the analogy between... difference form of the governing equation k ? (T'+'+ T' ' ? 2T') +e2 +, 2~6, y + ? s(2 ~t+T' rD ? 22 ) =0 ks which. when solved for Ti' becomes '=-'(':. ". ') +- 4 (as/A ) y A?(ar/as) 1 (Tj~t+T&', ) 2 (1+(Asa, )-r J (23) where A?wss the aspect...

  2. Manufacture of thermoelectric generator structures by fiber drawing

    DOE Patents [OSTI]

    McIntyre, Timothy J; Simpson, John T; West, David L

    2014-11-18T23:59:59.000Z

    Methods of manufacturing a thermoelectric generator via fiber drawing and corresponding or associated thermoelectric generator devices are provided.

  3. Fiber-optical analogue of the event horizon: Appendices

    E-Print Network [OSTI]

    Thomas G. Philbin; Chris Kuklewicz; Scott Robertson; Stephen Hill; Friedrich Konig; Ulf Leonhardt

    2007-12-13T23:59:59.000Z

    We explain the theory behind our fiber-optical analogue of the event horizon and present the experiment in detail.

  4. Fiber optically isolated and remotely stabilized data transmission system

    DOE Patents [OSTI]

    Nelson, M.A.

    1992-11-10T23:59:59.000Z

    A fiber optically isolated and remotely stabilized data transmission systems described wherein optical data may be transmitted over an optical data fiber from a remote source which includes a data transmitter and a power supply at the remote source. The transmitter may be remotely calibrated and stabilized via an optical control fiber, and the power source may be remotely cycled between duty and standby modes via an optical control fiber. 3 figs.

  5. Optimal Design Refrigeration System for a Mucilage Glue Fiber Factory

    E-Print Network [OSTI]

    Tan, C.; Liu, J.; Tang, F.; Liu, Y.

    2006-01-01T23:59:59.000Z

    ICEBO2006, Shenzhen, China HVAC Technologies for Energy Efficiency Vol.IV-1-4 Optimal Design Refrigeration System for a Mucilage Glue Fiber Factory Chaoyi Tan Jianlong Liu Fennan Tang Yang Liu Hunan University of Technology... fiber ICEBO2006, Shenzhen, China HVAC Technologies for Energy Efficiency Vol.IV-1-4 2. REFRIGERATION SYSTEM SUPERIOR DESIGN PROPOSAL IN MUCILAGE GLUE FIBER FACTORY 2.1 Refrigeration system superior design proposal in mucilage glue fiber factory...

  6. Designing the properties of dispersion-flattened photonic crystal fibers

    E-Print Network [OSTI]

    Fernández de Córdoba, Pedro

    crystal fibers," Electron. Lett. 35, 63-64 (1999). 4. P. J. Bennet, T. M. Monro, and D. J. Richardson

  7. Photon pair generation in birefringent optical fibers

    E-Print Network [OSTI]

    Brian J. Smith; P. Mahou; Offir Cohen; J. S. Lundeen; I. A. Walmsley

    2010-02-09T23:59:59.000Z

    We study both experimentally and theoretically the generation of photon pairs by spontaneous four-wave mixing (SFWM) in standard birefringent optical fibers. The ability to produce a range of two-photon spectral states, from highly correlated (entangled) to completely factorable, by means of cross-polarized birefringent phase matching, is explored. A simple model is developed to predict the spectral state of the photon pair which shows how this can be adjusted by choosing the appropriate pump bandwidth, fiber length and birefringence. Spontaneous Raman scattering is modeled to determine the tradeoff between SFWM and background Raman noise, and the predicted results are shown to agree with experimental data.

  8. Cluster state quantum computing in optical fibers

    E-Print Network [OSTI]

    Yasaman Soudagar; Felix Bussieres; Guido Berlin; Suzanne Lacroix; Jose M. Fernandez; Nicolas Godbout

    2006-05-12T23:59:59.000Z

    A scheme for the implementation of the cluster state model of quantum computing in optical fibers, which enables the feedforward feature, is proposed. This scheme uses the time-bin encoding of qubits. Following previously suggested methods of applying arbitrary one-qubit gates in optical fibers, two different ways for the realization of fusion gate types I and II for cluster production are proposed: a fully time-bin based encoding scheme and a combination of time-bin and polarization based encoding scheme. Also the methods of measurement in any desired bases for the purpose of the processing of cluster state computing for both these encodings are explained.

  9. Fiber optic mounted laser driven flyer plates

    DOE Patents [OSTI]

    Paisley, Dennis L. (Santa Fe, NM)

    1991-01-01T23:59:59.000Z

    A laser driven flyer plate where the flyer plate is deposited directly onto the squared end of an optical fiber. The plasma generated by a laser pulse drives the flyer plate toward a target. In another embodiment, a first metal layer is deposited onto the squared end of an optical fiber, followed by a layer of a dielectric material and a second metal layer. The laser pulse generates a plasma in the first metal layer, but the plasma is kept away from the second metal layer by the dielectric layer until the pressure reaches the point where shearing occurs.

  10. Optical transmittance degradation in tapered fibers

    E-Print Network [OSTI]

    Masazumi Fujiwara; Kiyota Toubaru; Shigeki Takeuchi

    2012-07-27T23:59:59.000Z

    We investigated the cause of optical transmittance degradation in tapered fibers. Degradation commences immediately after fabrication and it eventually reduces the transmittance to almost zero. It is a major problem that limits applications of tapered fibers. We systematically investigated the effect of the dust-particle density and the humidity on the degradation dynamics. The results clearly show that the degradation is mostly due to dust particles and that it is not related to the humidity. In a dust free environment it is possible to preserve the transmittance with a degradation of less than the noise (+/- ?0.02) over 1 week.

  11. Novel oxide-oxide fiber reinforced hot gas filter development

    SciTech Connect (OSTI)

    Wagner, R.A.

    1995-12-01T23:59:59.000Z

    The objective of this program is to fabricate and test oxide fiber reinforced composite hot gas filter elements for advanced power generation systems. The level of mechanical durability exhibited by the currently available filters in field tests indicates that more rugged filters are required to meet the demands of large power generation systems. Furthermore, long term corrosion resistance of currently available filters has yet to be demonstrated in PFBC systems. The essential requirements of a composite material designed to meet the program objective for a toughened hot gas filter include the following: Stable continuous fiber; rigid porous matrix; engineered fiber-matrix interface; and cost effectiveness. Based on properties, availability, and cost, Mitsui`s ALMAX alumina fiber and 3M`s NEXTEL 610 alumina fiber were selected as the oxide reinforcement fibers. In order to meet the economic goals of the program it is essential that the cost and amount of continuous fiber be minimized. A four axis filament winder will be used to fabricate filter Preforms in a variety of fiber architectures. Carbon was used as the initial fiber coating because it was known to be resistant to the Processing chemicals. The coating was produced by pyrolysis of the resin based sizings on the continuous fibers. The matrix of the composite filter is comprised of chopped ceramic fiber. Saffil fiber was used for all compositions in this program.

  12. Fiber-based combined optical coherence and multiphoton endomicroscopy

    E-Print Network [OSTI]

    Chen, Zhongping

    Fiber-based combined optical coherence and multiphoton endomicroscopy Gangjun Liu Zhongping Chen #12;Journal of Biomedical Optics 16(3), 036010 (March 2011) Fiber-based combined optical coherence. The efficiency can be further increased by fusing more multimode fibers with the DCF. Simultaneous optical

  13. Spectral background and transmission characteristics of fiber optic imaging bundles

    E-Print Network [OSTI]

    Gmitro, Arthur F.

    Spectral background and transmission characteristics of fiber optic imaging bundles Joshua Anthony August 2008 The emission and transmission properties of three commercially produced coherent fiber optic optical fibers are used in many imaging applications to allow the flexible relay of image planes over

  14. Fiber optic synchronisation architecture for high precision GPS applications

    E-Print Network [OSTI]

    Santerre, Rock

    Fiber optic synchronisation architecture for high precision GPS applications Daniel Macias and the receiver is monitored at the millimetre level [2]. These issues can be solved using optical fiber links), Université Laval, Québec, QC, G1V 0A6, Canada sophie.larochelle@gel.ulaval.ca Abstract: We propose a GPS-over-fiber

  15. OSE 4470L Fiber-Optic Communications Laboratory

    E-Print Network [OSTI]

    Van Stryland, Eric

    OSE 4470L Fiber-Optic Communications Laboratory Instructor: Guifang Li, CREOL 278, Phone 823 in classroom to what you can see in the lab of a variety topics related to fiber-optic communications. 2. Take course on the same topic (OSE 4470). The experiments are cover three topics: 1. The optical fiber

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

    E-Print Network [OSTI]

    Van Stryland, Eric

    COURSE SYLLABUS OSE 4470 FALL 2014 `FIBER-OPTIC COMMUNICATIONS' INSTRUCTOR: SASAN FATHPOUR CLASS of optical fiber communication systems including the optoelectronic devices used in transmitters and receivers. COURSE DESCRIPTION This course is an introduction to the principles of optical fiber

  17. STABILITY PROPERTIES OF LIGHT PROPAGATING IN FIBER OPTICS

    E-Print Network [OSTI]

    Kasman, Alex

    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

  18. High-index-core Bragg fibers: dispersion Juan A. Monsoriu

    E-Print Network [OSTI]

    Fernández de Córdoba, Pedro

    . P. Yeh, A. Yariv, and E. Marom, "Theory of Bragg fiber," J. Opt. Soc. Am. 68, 1196-1201 (1978). 4. Y. Xu, G.X. Ouyang, R.K. Lee, and A. Yariv, "Asymptotic Matrix Theory of Bragg Fibers," J. LightwaveHigh-index-core Bragg fibers: dispersion properties Juan A. Monsoriu Departamento de Física

  19. Fiber optic hydrophone sensor arrays using low reflectance internal mirrors 

    E-Print Network [OSTI]

    Lee, Jong-Seo

    1998-01-01T23:59:59.000Z

    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...

  20. Effects of g Radiation on Fiber-Reinforced Polymer Concrete

    E-Print Network [OSTI]

    North Texas, University of

    Effects of g Radiation on Fiber-Reinforced Polymer Concrete Gonzalo Marti´nez-Barrera,1,2 Luis F% of nylon fibers. The fiber-containing polymer concretes (PCs) were subjected to 5, 10, 50, and 100 k Engineers INTRODUCTION AND SCOPE It is well known that polymer concrete (PC) is three to five times stronger

  1. The FGM Concept in the Development of Fiber Cement Components

    SciTech Connect (OSTI)

    Dias, C. M. R.; John, V. M. [Department of Construction Engineering, Polytechnic School, University of Sao Paulo, 05508 900 Sao Paulo, SP (Brazil); Savastano, H. Jr. [Faculty of Animal Science and Food Engineering, University of Sao Paulo, Av. Duque de Caxias Norte 225, P.O. Box 23, 13635-900 Pirassununga, SP (Brazil)

    2008-02-15T23:59:59.000Z

    The FGM concept appears promising in improving the mechanical performance and reducing production costs of fiber cement building components. However, it has not yet been broadly applied to fiber cement technology. In this study we analyze the functionally graded fiber cement concept and its potential for industrial application in Hatschek machines. The conventional Hatschek process is summarized as well as the proposed modifications to allow FGM fiber cement production. The feasibility of producing functionally graded fiber cement by grading PVA fiber content was experimentally evaluated. Thermogravimetric (TG) and Scanning Electron Microscope (SEM) analysis were used to evaluate fiber distribution profiles. Four-point bending tests were applied to evaluate the mechanical performance of both conventional and functionally graded composites. The results shows that grading PVA fiber content is an effective way to produce functionally graded fiber cement, allowing the reduction of the total fiber volume without significant reduction on composite MOR. TG tests were found adequate to assess fiber content at different positions in functionally graded fiber cements.

  2. Constitutive Modeling of Fiber Composites with a Soft Hyperelastic Matrix

    E-Print Network [OSTI]

    Pellegrino, Sergio

    of unidirectional carbon fiber composites with a silicone matrix, loaded transversally to the fibers study uses a plane-strain finite element continuum model of the composite material in which the fiber (Campbell et al., 2005; Barrett et al., 2006). These composite materials are often described as memory

  3. NONNEGATIVE UNMIXING METHODOLOGY APPLIED ON BRILLOUIN OPTICAL FIBER SENSOR

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    NONNEGATIVE UNMIXING METHODOLOGY APPLIED ON BRILLOUIN OPTICAL FIBER SENSOR Edouard Buchoud1 As a complement to conventional sensors, Distributed Optical Fiber Sensors (DOFS) have gradually played. In complementary to traditional sensors, distributed fiber optic sensors (DOFS) are an attractive tool for SHM [1

  4. Fiber-optic oxygen sensor using molybdenum chloride cluster luminescence

    E-Print Network [OSTI]

    Ghosh, Ruby N.

    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, and medical applications. In these en- vironments the advantages of fiber-optic chemical sensors are that they

  5. ADHESIVE DISBOND MONITORING WITH MICROSTRUCTURED OPTICAL FIBER BRAGG GRATING SENSORS

    E-Print Network [OSTI]

    Boyer, Edmond

    ADHESIVE DISBOND MONITORING WITH MICROSTRUCTURED OPTICAL FIBER BRAGG GRATING SENSORS Sanne a sensing system that is based on a combination of 3 optical fiber sensors which are non optical fiber and feature an enhanced response to shear stress. The change in response of the sensors

  6. Voltage sensor with fiber Fabry-Perot interferometer

    E-Print Network [OSTI]

    Wann, Been-Huey

    1992-01-01T23:59:59.000Z

    INTRODUCTION. Page II RESEARCH DESCRIPTION. . . A. Optical Fiber Fabry-Perot Interferometer. . . . . B. Piezoelectricity. . C. Modulating Point in 60 Hz Voltage Measurement. . . . . . D. Temperature Control Circuit . . . . 18 . . . 26 III EXPERIMENTAL... PROCEDURES AND RESULTS. . . . . . A. Fabrication of the Optical Fiber Fabry-Perot Interferometer B. Selection of Piezoelectric Materials. C. Implementation of Temperature Control Circuit. . . . D. Experiments of Optical Fiber Voltage Sensor...

  7. EFFECTS OF FIBER WAVINESS ON COMPOSITES FOR WIND TURBINE BLADES

    E-Print Network [OSTI]

    EFFECTS OF FIBER WAVINESS ON COMPOSITES FOR WIND TURBINE BLADES J.F. Mandell D.D. Samborsky and L Composite materials of interest for wind turbine blades use relatively low cost fibers, resins and processes WORDS: Composite Materials, Fiber Waviness, Compressive Strength #12;1. INTRODUCTION Wind turbine blades

  8. Specific Effects of Fiber Size and Fiber Swelling on Biomass Substrate Surface Area and Enzymatic Digestibility

    SciTech Connect (OSTI)

    Ju, Xiaohui; Grego, Courtnee; Zhang, Xiao

    2013-09-01T23:59:59.000Z

    To clarify the specific effect of biomass substrate surface area on its enzymatic digestibility, factors of fiber size reduction and swelling changes were investigated by using poplar substrates with controlled morphological and chemical properties after modified chemical pulping. Results showed that fiber size changes had insignificant influence on enzymatic hydrolysis, although the external surface area increased up to 41% with the reduction of fiber size. Swelling changes caused by increased biomass fiber porosities after PFI refining showed a significant influence on the efficiency of enzymatic hydrolysis. It is also found that chemical properties such as xylan and lignin content can influence the swelling effect. Xylan is confirmed to facilitate substrate hydrolysability by swelling, while lignin restricts swelling effect and thus minimizes the enzyme accessibility to substrates.

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

    E-Print Network [OSTI]

    Wapperom, Peter

    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

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

    E-Print Network [OSTI]

    Matthewson, M. John

    Hybrid glass coatings for optical fibers: effect of coating thickness on strength and dynamic, the State University of New Jersey, Piscataway, NJ 08854, USA c Laboratory of Optical Fiber Technology, UMCS, Lublin, 20031, Poland, ABSTRACT Specialty optical fibers operating in harsh aerospace environments

  11. On band gaps in photonic crystal fibers

    E-Print Network [OSTI]

    Shane Cooper; Ilia Kamotski; Valery Smyshlyaev

    2014-11-02T23:59:59.000Z

    We consider the Maxwell's system for a periodic array of dielectric `fibers' embedded into a `matrix', with respective electric permittivities $\\epsilon_0$ and $\\epsilon_1$, which serves as a model for cladding in photonic crystal fibers (PCF). The interest is in describing admissible and forbidden (gap) pairs $(\\omega,k)$ of frequencies $\\omega$ and propagation constants $k$ along the fibers, for a Bloch wave solution on the cross-section. We show that, for "pre-critical" values of $k(\\omega)$ i.e. those just below $\\omega (\\min\\{\\epsilon_0,\\epsilon_1\\}\\mu)^{1/2}$ (where $\\mu$ is the magnetic permeability assumed constant for simplicity), the coupling specific to the Maxwell's systems leads to a particular partially degenerating PDE system for the axial components of the electromagnetic field. Its asymptotic analysis allows to derive the limit spectral problem where the fields are constrained in one of the phases by Cauchy-Riemann type relations. We prove related spectral convergence. We finally give some examples, in particular of small size "arrow" fibers ($\\epsilon_0>\\epsilon_1$) where the existence of the gaps near appropriate "micro-resonances" is demonstrated by a further asymptotic analysis.

  12. Single-fiber multi-color pyrometry

    DOE Patents [OSTI]

    Small, IV, Ward; Celliers, Peter

    2004-01-27T23:59:59.000Z

    This invention is a fiber-based multi-color pyrometry set-up for real-time non-contact temperature and emissivity measurement. The system includes a single optical fiber to collect radiation emitted by a target, a reflective rotating chopper to split the collected radiation into two or more paths while modulating the radiation for lock-in amplification (i.e., phase-sensitive detection), at least two detectors possibly of different spectral bandwidths with or without filters to limit the wavelength regions detected and optics to direct and focus the radiation onto the sensitive areas of the detectors. A computer algorithm is used to calculate the true temperature and emissivity of a target based on blackbody calibrations. The system components are enclosed in a light-tight housing, with provision for the fiber to extend outside to collect the radiation. Radiation emitted by the target is transmitted through the fiber to the reflective chopper, which either allows the radiation to pass straight through or reflects the radiation into one or more separate paths. Each path includes a detector with or without filters and corresponding optics to direct and focus the radiation onto the active area of the detector. The signals are recovered using lock-in amplification. Calibration formulas for the signals obtained using a blackbody of known temperature are used to compute the true temperature and emissivity of the target. The temperature range of the pyrometer system is determined by the spectral characteristics of the optical components.

  13. Single-fiber multi-color pyrometry

    DOE Patents [OSTI]

    Small, IV, Ward (Livermore, CA); Celliers, Peter (Berkeley, CA)

    2000-01-01T23:59:59.000Z

    This invention is a fiber-based multi-color pyrometry set-up for real-time non-contact temperature and emissivity measurement. The system includes a single optical fiber to collect radiation emitted by a target, a reflective rotating chopper to split the collected radiation into two or more paths while modulating the radiation for lock-in amplification (i.e., phase-sensitive detection), at least two detectors possibly of different spectral bandwidths with or without filters to limit the wavelength regions detected and optics to direct and focus the radiation onto the sensitive areas of the detectors. A computer algorithm is used to calculate the true temperature and emissivity of a target based on blackbody calibrations. The system components are enclosed in a light-tight housing, with provision for the fiber to extend outside to collect the radiation. Radiation emitted by the target is transmitted through the fiber to the reflective chopper, which either allows the radiation to pass straight through or reflects the radiation into one or more separate paths. Each path includes a detector with or without filters and corresponding optics to direct and focus the radiation onto the active area of the detector. The signals are recovered using lock-in amplification. Calibration formulas for the signals obtained using a blackbody of known temperature are used to compute the true temperature and emissivity of the target. The temperature range of the pyrometer system is determined by the spectral characteristics of the optical components.

  14. Fiber type, meal frequency and colonic cytokinetics

    E-Print Network [OSTI]

    Zhang, Jianhu

    1993-01-01T23:59:59.000Z

    The effects of dietary fiber type (cellulose, pectin or oat bran) and meal frequency (gorge or nibble) on colonic short chain fatty acids (SCFAs), in vivo colonic pH and epithelial cell proliferation were examined in male Sprague-Dawley rats...

  15. Metal matrix coated fiber composites and the methods of manufacturing such composites

    DOE Patents [OSTI]

    Weeks, Jr., Joseph K. (Salt Lake City, UT); Gensse, Chantal (Salt Lake City, UT)

    1993-01-01T23:59:59.000Z

    A fiber coating which allows ceramic or metal fibers to be wetted by molten metals is disclosed. The coating inhibits degradation of the physical properties caused by chemical reaction between the fiber and the coating itself or between the fiber and the metal matrix. The fiber coating preferably includes at least a wetting layer, and in some applications, a wetting layer and a barrier layer between the fiber and the wetting layer. The wetting layer promotes fiber wetting by the metal matrix. The barrier layer inhibits fiber degradation. The fiber coating permits the fibers to be infiltrated with the metal matrix resulting in composites having unique properties not obtainable in pure materials.

  16. Photon production by charged particles in narrow optical fibers

    E-Print Network [OSTI]

    X. Artru; C. Ray

    2006-10-11T23:59:59.000Z

    A charged particle passing through or by an optical fiber induces emission of light guided by the fiber. The formula giving the spontaneous emission amplitude are given in the general case when the particle trajectory is not parallel to the fiber axis. At small angle, the photon yield grows like the inverse power of the angle and in the parallel limiting case the fiber Cherenkov effect studied by Bogdankevich and Bolotovskii is recovered. Possible application to beam diagnostics are discussed, as well as resonance effects when the particle trajectory or the fiber is bent periodically.

  17. Special purpose modes in photonic band gap fibers

    DOE Patents [OSTI]

    Spencer, James; Noble, Robert; Campbell, Sara

    2013-04-02T23:59:59.000Z

    Photonic band gap fibers are described having one or more defects suitable for the acceleration of electrons or other charged particles. Methods and devices are described for exciting special purpose modes in the defects including laser coupling schemes as well as various fiber designs and components for facilitating excitation of desired modes. Results are also presented showing effects on modes due to modes in other defects within the fiber and due to the proximity of defects to the fiber edge. Techniques and devices are described for controlling electrons within the defect(s). Various applications for electrons or other energetic charged particles produced by such photonic band gap fibers are also described.

  18. Recovery of uranium from seawater using amidoxime hollow fibers

    SciTech Connect (OSTI)

    Saito, K.; Uezu, K.; Hori, T.; Furusaki, S.; Sugo, T.; Okamoto, J.

    1988-03-01T23:59:59.000Z

    A novel amidoxime-group-containing adsorbent of hollow-fiber form (AO-H fiber) was prepared by radiation-induced graft polymerization of acrylonitrile onto a polyethylene hollow fiber, followed by chemical conversion of the produced cyano group to an amidoxime group. Distribution of the amidoxime group was uniform throughout hollow-fiber membrane. The fixed-bed adsorption column, 30 cm in length and charged with the bundle of AO-H fibers, was found to adsorb uranium from natural seawater at a sufficiently high rate: 0.66 mg uranium per g of adsorbent in 25 days.

  19. Method of producing a hybrid matrix fiber composite

    DOE Patents [OSTI]

    Deteresa, Steven J. (Livermore, CA); Lyon, Richard E. (Absecon, NJ); Groves, Scott E. (Brentwood, CA)

    2006-03-28T23:59:59.000Z

    Hybrid matrix fiber composites having enhanced compressive performance as well as enhanced stiffness, toughness and durability suitable for compression-critical applications. The methods for producing the fiber composites using matrix hybridization. The hybrid matrix fiber composites comprised of two chemically or physically bonded matrix materials, whereas the first matrix materials are used to impregnate multi-filament fibers formed into ribbons and the second matrix material is placed around and between the fiber ribbons that are impregnated with the first matrix material and both matrix materials are cured and solidified.

  20. Single-mode fiber, velocity interferometry

    SciTech Connect (OSTI)

    Krauter, K. G.; Jacobson, G. F.; Patterson, J. R.; Nguyen, J. H.; Ambrose, W. P. [Lawrence Livermore National Laboratory, 7000 East Ave., Livermore California 94551 (United States)

    2011-04-15T23:59:59.000Z

    In this paper, we describe a velocity interferometer system based entirely on single-mode fiber optics. This paper includes a description of principles used in developing the single-mode velocity interferometry system (SMV). The SMV design is based on polarization-insensitive components. Polarization adjusters are included to eliminate the effects of residual birefringence and polarization dependent losses in the interferometers. Characterization measurements and calibration methods needed for data analysis and a method of data analysis are described. Calibration is performed directly using tunable lasers. During development, we demonstrated its operation using exploding-foil bridge-wire fliers up to 200 m/s. In a final test, we demonstrated the SMV in a gas gun experiment up to 1.2 km/sec. As a basis for comparison in the gas gun experiment, we used another velocimetry technique that is also based on single-mode fiber optics: photonic Doppler velocimetry (PDV). For the gas gun experiment, we split the light returned from a single target spot and performed a direct comparison of the homodyne (SMV) and heterodyne (PDV) techniques concurrently. The two techniques had a negligible mean difference and a 1.5% standard deviation in the one-dimensional shock zone. Within one interferometer delay time after a sudden Doppler shift, a SMV unencumbered by multimode-fiber dispersion exhibits two color beats. These beats have the same period as PDV beats--this interference occurs between the ''recently'' shifted and ''formerly unshifted'' paths within the interferometer. We believe that recognizing this identity between homodyne and heterodyne beats is novel in the shock-physics field. SMV includes the conveniences of optical fiber, while removing the time resolution limitations associated with the multimode delivery fiber.

  1. Mechanical property evaluation of natural fiber coir composite

    SciTech Connect (OSTI)

    Harish, S. [Department of Mechanical and Aerospace Engineering, Arizona State University (United States); Michael, D. Peter [Department of Mechanical Engineering, College of Engineering, Guindy (India); Bensely, A. [Department of Mechanical Engineering, College of Engineering, Guindy (India)], E-mail: benzlee5@yahoo.com; Lal, D. Mohan [Department of Mechanical Engineering, College of Engineering, Guindy (India); Rajadurai, A. [Department of Production Engineering, Madras Institute of Technology (India)

    2009-01-15T23:59:59.000Z

    The fiber which serves as a reinforcement in reinforced plastics may be synthetic or natural. Past studies show that only artificial fibers such as glass, carbon etc., have been used in fiber-reinforced plastics. Although glass and other synthetic fiber-reinforced plastics possess high specific strength, their fields of application are very limited because of their inherent higher cost of production. In this connection, an investigation has been carried out to make use of coir, a natural fiber abundantly available in India. Natural fibers are not only strong and lightweight but also relatively very cheap. In the present work, coir composites are developed and their mechanical properties are evaluated. Scanning electron micrographs obtained from fractured surfaces were used for a qualitative evaluation of the interfacial properties of coir/epoxy and compared with glass fiber/epoxy. These results indicate that coir can be used as a potential reinforcing material for making low load bearing thermoplastic composites.

  2. Development of silicon nitride composites with continuous fiber reinforcement

    SciTech Connect (OSTI)

    Starr, T.L.; Mohr, D.L.; Lackey, W.J.; Hanigofsky, J.A. [Georgia Inst. of Tech., Atlanta, GA (United States). Georgia Technology Research Inst.

    1993-10-01T23:59:59.000Z

    The composites were fabricated using ultrafine Si powders prepared by attritor milling; the powders exhibits full conversion to Si nitride in < 3 h at {le} 1200 C (these conditions reduce degradation of the fibers compared to conventional). Effects of processing conditions on fiber properties and the use of fiber coatings to improve stability during processing as well as change the fiber-matrix interfacial properties were investigated. A duplex carbon-silicon carbide coating, deposited by CVD, reduced fiber degradation in processing, and it modified the fiber-matrix adhesion. Si nitride matrix composites were fabricated using reaction sintering, forming laminates, filament-wound plates, and tubes. In each case, an attritor milled Si powder slurry is infiltrated into ceramic fiber preforms or tows, which are then assembled to form a 3-D structure for reaction sintering. The resulting composites have properties comparable to chemical vapor infiltration densified composites, with reasonable strengths and graceful composite fracture behavior.

  3. Method for optical and mechanically coupling optical fibers

    DOE Patents [OSTI]

    Toeppen, John S. (Livermore, CA)

    1996-01-01T23:59:59.000Z

    A method and apparatus for splicing optical fibers. A fluorescing solder glass frit having a melting point lower than the melting point of first and second optical fibers is prepared. The solder glass frit is then attached to the end of the first optical fiber and/or the end of the second optical fiber. The ends of the optical fibers are aligned and placed in close proximity to each other. The solder glass frit is then heated to a temperature which is lower than the melting temperature of the first and second optical fibers, but which is high enough to melt the solder glass frit. A force is applied to the first and second optical fibers pushing the ends of the fibers towards each other. As the solder glass flit becomes molten, the layer of molten solder glass is compressed into a thin layer between the first and second optical fibers. The thin compressed layer of molten solder glass is allowed to cool such that the first and second optical fibers are bonded to each other by the hardened layer of solder glass.

  4. Photonic bandgap narrowing in conical hollow core Bragg fibers

    SciTech Connect (OSTI)

    Ozturk, Fahri Emre; Yildirim, Adem; Kanik, Mehmet [UNAM-National Nanotechnology Research Center, Bilkent University, 06800 Ankara (Turkey); Institute of Materials Science and Nanotechnology, Bilkent University, 06800 Ankara (Turkey); Bayindir, Mehmet, E-mail: bayindir@nano.org.tr [UNAM-National Nanotechnology Research Center, Bilkent University, 06800 Ankara (Turkey); Institute of Materials Science and Nanotechnology, Bilkent University, 06800 Ankara (Turkey); Department of Physics, Bilkent University, 06800 Ankara (Turkey)

    2014-08-18T23:59:59.000Z

    We report the photonic bandgap engineering of Bragg fibers by controlling the thickness profile of the fiber during the thermal drawing. Conical hollow core Bragg fibers were produced by thermal drawing under a rapidly alternating load, which was applied by introducing steep changes to the fiber drawing speed. In conventional cylindrical Bragg fibers, light is guided by omnidirectional reflections from interior dielectric mirrors with a single quarter wave stack period. In conical fibers, the diameter reduction introduced a gradient of the quarter wave stack period along the length of the fiber. Therefore, the light guided within the fiber encountered slightly smaller dielectric layer thicknesses at each reflection, resulting in a progressive blueshift of the reflectance spectrum. As the reflectance spectrum shifts, longer wavelengths of the initial bandgap cease to be omnidirectionally reflected and exit through the cladding, which narrows the photonic bandgap. A narrow transmission bandwidth is particularly desirable in hollow waveguide mid-infrared sensing schemes, where broadband light is coupled to the fiber and the analyte vapor is introduced into the hollow core to measure infrared absorption. We carried out sensing simulations using the absorption spectrum of isopropyl alcohol vapor to demonstrate the importance of narrow bandgap fibers in chemical sensing applications.

  5. Growing Crystaline Sapphire Fibers By Laser Heated Pedestal Techiques

    DOE Patents [OSTI]

    Phomsakha, Vongvilay (St. Petersburg, FL); Chang, Robert S. F. (Tampa, FL); Djeu, Nicholas I. (Tampa, FL)

    1997-03-04T23:59:59.000Z

    An improved system and process for growing crystal fibers comprising a means for creating a laser beam having a substantially constant intensity profile through its cross sectional area, means for directing the laser beam at a portion of solid feed material located within a fiber growth chamber to form molten feed material, means to support a seed fiber above the molten feed material, means to translate the seed fiber towards and away from the molten feed material so that the seed fiber can make contact with the molten feed material, fuse to the molten feed material and then be withdrawn away from the molten feed material whereby the molten feed material is drawn off in the form of a crystal fiber. The means for creating a laser beam having a substantially constant intensity profile through its cross sectional area includes transforming a previously generated laser beam having a conventional gaussian intensity profile through its cross sectional area into a laser beam having a substantially constant intensity profile through its cross sectional area by passing the previously generated laser beam through a graded reflectivity mirror. The means for directing the laser beam at a portion of solid feed material is configured to direct the laser beam at a target zone which contains the molten feed material and a portion of crystal fiber drawn off the molten feed material by the seed fiber. The means to support the seed fiber above the molten feed material is positioned at a predetermined height above the molten feed material. This predetermined height provides the seed fiber with sufficient length and sufficient resiliency so that surface tension in the molten feed material can move the seed fiber to the center of the molten feed material irrespective of where the seed fiber makes contact with the molten feed material. The internal atmosphere of the fiber growth chamber is composed substantially of Helium gas.

  6. Desorption of uranium from amidoxime fiber adsorbent

    SciTech Connect (OSTI)

    Goto, Akira; Morooka, Shigeharu; Fukamachi, Masakazu; Kusakabe, Katsuki (Kyushu Univ., Fukuoka (Japan)); Kago, Tokihiro (Towa Univ., Fukuoka (Japan))

    1993-10-01T23:59:59.000Z

    An amidoxime fibrous adsorbent is contacted with uranium-enriched seawater (10 ppm); about 10 mg uranium is loaded per 1 g dry fiber. Then the rate and yield of uranium desorption from the fiber are determined with various eluents. Acid solutions are superior to alkali carbonate solutions as eluents. With a 0.1 mol[center dot]L[sup [minus]1] HCl solution, desorption is completed in 2 hours regardless of the presence of uranium in the leaching solution up to 15 ppm ([approx]6 [times] 10[sup [minus]5]mol[center dot]L[sup [minus]1]). Serial operation of the adsorption-desorption cycle four times does not affect desorption efficiency, but the addition of heavy metal ions to the eluent at a level of 1.8 [times] 10[sup [minus]3]mol[center dot]L[sup [minus]1] significantly decreases desorption efficiency. 13 refs., 5 figs., 1 tab.

  7. Temperature and electrical memory of polymer fibers

    SciTech Connect (OSTI)

    Yuan, Jinkai; Zakri, Cécile; Grillard, Fabienne; Neri, Wilfrid; Poulin, Philippe [Centre de Recherche Paul Pascal - CNRS, University of Bordeaux, Avenue Schweitzer, 33600 Pessac (France)

    2014-05-15T23:59:59.000Z

    We report in this work studies of the shape memory behavior of polymer fibers loaded with carbon nanotubes or graphene flakes. These materials exhibit enhanced shape memory properties with the generation of a giant stress upon shape recovery. In addition, they exhibit a surprising temperature memory with a peak of generated stress at a temperature nearly equal to the temperature of programming. This temperature memory is ascribed to the presence of dynamical heterogeneities and to the intrinsic broadness of the glass transition. We present recent experiments related to observables other than mechanical properties. In particular nanocomposite fibers exhibit variations of electrical conductivity with an accurate memory. Indeed, the rate of conductivity variations during temperature changes reaches a well defined maximum at a temperature equal to the temperature of programming. Such materials are promising for future actuators that couple dimensional changes with sensing electronic functionalities.

  8. Fiber coatings and the fracture behavior of a continuous fiber ceramic composite

    SciTech Connect (OSTI)

    Miller, J.H.; Lowden, R.A. [Oak Ridge National Lab., TN (United States); Liaw, P.K. [Univ. of Knoxville, TN (United States)

    1995-12-31T23:59:59.000Z

    Continuous fiber reinforced ceramic composites (CFCC) are being recognized as necessary for high-temperature structural applications. For instance, the applications of SiC/SiC composites in elevated-temperature structures, such as first wall, and high heat flux surfaces in fusion reactors, as well as in combustors and boiler components in power generation systems, have drawn considerable attention. In the present study, Nicalon{sup {reg_sign}} plane-weave fiber reinforced SiC matrix composites have been fabricated by forced chemical vapor infiltration (FCVI) methods. The influence of fiber/matrix interface coating thickness on the fracture behavior of the continuous fiber reinforced SiC composites has been investigated. Experimental results indicate that fiber coating thickness significantly alters the fracture behavior of SiC composites. The fracture strength exhibits a maximum as the coating thickness increases. A mechanistic understanding of the fracture behavior is provided. Furthermore, a theoretical model is formulated to provide a better understanding of the effects of coating thickness on fracture behavior. The predicted fracture behavior was found to be in good agreement with the experimental results.

  9. Ternary liquid scintillator for optical fiber applications

    DOE Patents [OSTI]

    Franks, Larry A. (Santa Barbara, CA); Lutz, Stephen S. (Santa Barbara, CA)

    1982-01-01T23:59:59.000Z

    A multicomponent liquid scintillator solution for use as a radiation-to-light converter in conjunction with a fiber optic transmission system. The scintillator includes a quantity of 5-amino-9-diethylaminobenz (a) phenoxazonium nitrate (Nile Blue Nitrate) as a solute in a fluor solvent such as benzyl alcohol. The use of PPD as an additional solute is also disclosed. The system is controllable by addition of a suitable quenching agent, such as phenol.

  10. Tests of Complete Positivity in Fiber Optics

    E-Print Network [OSTI]

    F. Benatti; R. Floreanini

    2006-07-11T23:59:59.000Z

    We consider the propagation of polarized photons in optical fibers under the action of randomly generated noise. In such situation, the change in time of the photon polarization can be described by a quantum dynamical semigroup. We show that the hierarchy among the decay constants of the polarization density matrix elements as prescribed by complete positivity can be experimentally probed using standard laboratory set-ups.

  11. Indigestible fiber components as possible internal markers

    E-Print Network [OSTI]

    Jacobs, Bernard Frederick

    1975-01-01T23:59:59.000Z

    fermentation procedures indicated that essentially maximum digestibility of both forage and feces was achieved after six days fermentation. The in oivo recovery of neutral detergent fiber indigestible after 6 days in vitro ranged from 78. 1 to 101. 6... (when available) samples and . 5 gram fecal samples were fermented in triplicate, eithe in nitro or in situ. Fermentation Procedures The in nitro technique used was a modification of the Van Soest and Wine (1967) procedure- in that 35 x 250 mm...

  12. Ammonia fiber explosion (AFEX) treatment of grass

    E-Print Network [OSTI]

    Ashok, Ganesh

    1991-01-01T23:59:59.000Z

    solution), high-temperature treatment, and freezing in water suspensions at -75 C (Millett, Baker, and Satter, 1975), Chemical pretreatments include alkali and ammonia swelling, dilute acid extraction, NO with alkali, explosive steam decompression, wet... for ruminants. Ammonia explosion pulping has been investigated as an approach to fiber separation in wood chips (O' Connor, 1971). Recent work on pretreatment techniques includes: pretreatment of cedar with peracetic acid and steam explosion to improve...

  13. Full Scale Coated Fiber Neutron Detector Measurements

    SciTech Connect (OSTI)

    Kouzes, Richard T.; Ely, James H.; Erikson, Luke E.; Kernan, Warnick J.; Stromswold, David C.; Woodring, Mitchell L.

    2010-03-17T23:59:59.000Z

    Radiation portal monitors used for interdiction of illicit materials at borders include highly sensitive neutron detection systems. The main reason for having neutron detection capability is to detect fission neutrons from plutonium. The currently deployed radiation portal monitors (RPMs) from Ludlum and Science Applications International Corporation (SAIC) use neutron detectors based upon 3He-filled gas proportional counters, which are the most common large neutron detector. There is a declining supply of 3He in the world, and thus, methods to reduce the use of this gas in RPMs with minimal changes to the current system designs and sensitivity to cargo-borne neutrons are being investigated. Four technologies have been identified as being currently commercially available, potential alternative neutron detectors to replace the use of 3He in RPMs. These technologies are: 1) Boron trifluoride (BF3)-filled proportional counters, 2) Boron-lined proportional counters, 3) Lithium-loaded glass fibers, and 4) Coated non-scintillating plastic fibers. Reported here are the results of tests of the full-scale 6Li/ZnS(Ag)-coated non-scintillating plastic fibers option. This testing measured the required performance for neutron detection efficiency and gamma ray rejection capabilities of a system manufactured by Innovative American Technology (IAT) and Saint Gobain, and is a follow-up report to an earlier one on a smaller prototype system.

  14. Single-crystal YAG fiber optics for the transmission of high energy laser energy

    E-Print Network [OSTI]

    Single-crystal YAG fiber optics for the transmission of high energy laser energy X.S. Zhua , James. Thus, it is reasonable to assume that YAG fibers will have high laser damage thresholds. The optical of YAG fiber grown has been about 60 cm. Keywords: Infrared fiber optics, single-crystal fibers, oxide

  15. CaRbON FibeR Demonstrating Innovative Low-Cost

    E-Print Network [OSTI]

    Pennycook, Steve

    for manufacturing carbon fiber and carbon-fiber-reinforced composite structures tend to be slow and energy intensive the development and growth of existing and new US carbon fiber and composites · Job Growth Seed regionalCaRbON FibeR TeChNOLOGy FaCiLiTy Demonstrating Innovative Low-Cost Carbon Fiber for Energy

  16. Fractographic investigation of flaws in sintered SiC fiber

    SciTech Connect (OSTI)

    Srinivasan, G.V.; Venkateswaran, V. [Carborundum Company, Niagara Falls, NY (United States)

    1996-12-31T23:59:59.000Z

    The Carborundum Company has developed a continuous process to produce multifilament, polycrystalline SiC fiber tow. The process uses a melt spinning approach to make the green fibers wherein the submicron SiC powder is mixed with polymers and the resulting compound is melt spun and extruded through a spinnerette. After extraction, the green fibers are sintered in a continuous sintering line. The properties of this fiber are given. This paper will describe the use of fractography in directing the fiber developmental efforts, specifically on characterization of strength-limiting defects and their origination. Fractographic analysis is also extended to determining strength of fibers at any gauge length and in identifying artifacts associated with the tensile strength testing technique.

  17. Progress in the development of scintillating optical fibers

    SciTech Connect (OSTI)

    Borenstein, S.R.; Strand, R.C.

    1983-01-01T23:59:59.000Z

    Starting with 1 inch diameter PVT scintillator as a preform, the authors have drawn fibers of several diameters ranging from 1 to 4 mm. These fibers have been coated in line with the draw to form optical fibers. Several cladding materials whose index of refraction ranges from 1.35 to 1.55 have been used. The most successful fiber has been obtained with an extra thick (200 micron) cladding of silicone in combination with a linear draw, as opposed to a spool draw. This fiber is acceptable, but it is extremely fragile and its quality is difficult to control. The authors are currently constructing a 12 channel hodoscope with 1 mm spatial resolution using 4 mm diameter fibers. An account is also given of the progress made in using the Avalanche Photo Diode (APD) operated in the Geiger mode as the photo detector.

  18. Epoxy Nanocomposites - Curing Rheokinetics, Wetting and Adhesion to Fibers

    SciTech Connect (OSTI)

    Ilyin, S. O.; Kotomin, S. V.; Kulichikhin, V. G. [A.V.Topchiev Institute of Petrochemical Synthesis, 29, Leninskii Prospect, Moscow, 119991 (Russian Federation)

    2010-06-02T23:59:59.000Z

    Epoxy nanocomposites considered as challenging polymeric matrix for advanced reinforced plastics. Nanofillers change rheokinetics of epoxy resin curing, affect wetting and adhesion to aramid and carbon fibers. In all cases extreme dependence of adhesive strength vs filler content in the binder was observed. New experimental techniques were developed to study wettability and fiber-matrix adhesion interaction, using yarn penetration path length, aramid fiber knot pull-up test and electrical admittance of the fracture surface of CFRP.

  19. Determination of mechanisms by which soluble fibers lower serum cholesterol

    E-Print Network [OSTI]

    Sun, Xiao-Qing

    1991-01-01T23:59:59.000Z

    suggested that one mechanism for the hypo- cholesterolemic effect of certain soluble fibers might be related to the absorption of propionate& a fermentation metabolite of soluble plant fiber, which may inhibit hepatic cholesterol synthesis. In rats, oat... gels and are highly fermentable. In contrast, insoluble fibers do not form gels and are poorly fermentable, but are excellent as bulking agents [37]. This is supported by data from the present study that showed that cellulose-fed rats had...

  20. Optical Fiber Sensor Instrumentation for Slagging Coal Gasifiers

    SciTech Connect (OSTI)

    Anbo Wang; Kristie Cooper

    2008-07-19T23:59:59.000Z

    Coal gasifier is one of the most promising solutions for clean fossil energy. Refractory thickness monitoring and online real-time temperature measurement is needed for improved reliability and advanced process control for current and future generation power plants. The objective of this program is to design and implement an optical fiber based sensing system that could potentially be used to monitor refractory wall thickness and temperature inside a coal gasifier. For the thickness monitoring, the system should be able to operate at temperatures up to 1000 C. For this temperature range, silica fiber can still work so it is chosen for the sensor design. The measurement is based on a photon counting optical time domain reflectometer. A narrow light pulse is launched into a silica fiber which could be embedded into the gasifier refractory wall, and is partially reflected by the far end of the fiber. The time of flight of the light pulse in the fiber then gives an indication of the position of the fiber end, which is a function of the wall thickness when the fiber is embedded. Results obtained show a measurement accuracy of {+-}2cm in environment of 1000 C with a saw cut fiber end. When the fiber end is corroded by sodium carbide at 900 C, the accuracy is {+-}3cm. For the temperature measurement, a single crystal sapphire fiber sensor is designed. The sapphire fiber guides the broadband light from a light emitting diode to a sapphire wafer functioning as a Fabry-Perot interferometer and the wafer optical thickness is a function of temperature. The returned optical signal is then demodulated by multimode fiber based whitelight interferometry. The system was tested up to 1500 C with a measurement accuracy of {+-}10 C for the entire measurement range.

  1. Characterization of carbon fibers: coefficient of thermal expansion and microstructure

    E-Print Network [OSTI]

    Kulkarni, Raghav Shrikant

    2006-04-12T23:59:59.000Z

    both the longitudinal and transverse CTE. The orthotropy in the CTE is tested by rotating the fibers through 45? about their axis. The method is validated by testing standard tungsten filaments of known CTE. Additionally, the microstructure... strain vs. temperature for tungsten................................... 40 Figure 3.3 Strain vs. temperature for P55 fiber.................................................... 42 Figure 3.4 Cross sectional images of IM7 fibers failed in bending...

  2. Faceted ceramic fibers, tapes or ribbons and epitaxial devices therefrom

    DOE Patents [OSTI]

    Goyal, Amit

    2013-07-09T23:59:59.000Z

    A crystalline article includes a single-crystal ceramic fiber, tape or ribbon. The fiber, tape or ribbon has at least one crystallographic facet along its length, which is generally at least one meter long. In the case of sapphire, the facets are R-plane, M-plane, C-plane or A-plane facets. Epitaxial articles, including superconducting articles, can be formed on the fiber, tape or ribbon.

  3. Faceted ceramic fibers, tapes or ribbons and epitaxial devices therefrom

    DOE Patents [OSTI]

    Goyal, Amit (Knoxville, TN)

    2012-07-24T23:59:59.000Z

    A crystalline article includes a single-crystal ceramic fiber, tape or ribbon. The fiber, tape or ribbon has at least one crystallographic facet along its length, which is generally at least one meter long. In the case of sapphire, the facets are R-plane, M-plane, C-plane or A-plane facets. Epitaxial articles, including superconducting articles, can be formed on the fiber, tape or ribbon.

  4. Fiber optics interface for a dye laser oscillator and method

    DOE Patents [OSTI]

    Johnson, Steve A. (Tracy, CA); Seppala, Lynn G. (Pleasanton, CA)

    1986-01-01T23:59:59.000Z

    A dye laser oscillator in which one light beam is used to pump a continuous tream of dye within a cooperating dye chamber for producing a second, different beam is generally disclosed herein along with a specific arrangement including an optical fiber and a fiber optics interface for directing the pumping beam into the dye chamber. The specific fiber optics interface illustrated includes three cooperating lenses which together image one particular dimension of the pumping beam into the dye chamber from the output end of the optical fiber in order to insure that the dye chamber is properly illuminated by the pumping beam.

  5. Sandia Energy - Sandia and EMCORE: Solar Photovoltaics, Fiber...

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

    EMCORE: Solar Photovoltaics, Fiber Optics, MODE, and Energy Efficiency Home Renewable Energy Energy Partnership Concentrating Solar Power Photovoltaic Research & Capabilities Solar...

  6. Characterization of commercial fiber optic connectors - Preliminary report

    SciTech Connect (OSTI)

    Andrews, Larry A.; Williams, Randy J.

    1998-09-01T23:59:59.000Z

    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.

  7. Microsoft Word - CX -Marion to Santiam Fiber.doc

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

    in Marion County, Oregon to BPA's Santiam Substation in Linn County, Oregon. The fiber optics along this route would provide additional support of BPA's internal operational needs...

  8. Resolving optical illumination distributions along an axially symmetric photodetecting fiber

    E-Print Network [OSTI]

    Sorin, Fabien

    Photodetecting fibers of arbitrary length with internal metal, semiconductor and insulator domains have recently been demonstrated. These semiconductor devices exhibit a continuous translational symmetry which presents ...

  9. Resolving optical illumination distributions along an axially symmetric photodetecting fiber

    E-Print Network [OSTI]

    Lestoquoy, Guillaume

    2012-01-01T23:59:59.000Z

    Photodetecting fibers of arbitrary length with internal metal, semiconductor and insulator domains have recently been demonstrated. These semiconductor devices display a continuous translational symmetry which presents ...

  10. A microcomputer control system for a fiber optic spectrophotometer

    E-Print Network [OSTI]

    Spar, Steven Matthew

    1986-01-01T23:59:59.000Z

    SENSOR LICH'I SOURCE OPTICAL F I BER ~SAMPLE PHOTODE'IECTOR o r D o o n o 0 ~ o r Figure lb. Block Diagram of a Fiber Optic Spectrophotometer Fiber optic spectrophotometry uses the light conducting properties of tiny optical fibers... to carry the light to and from a remote sensor, as shown in Figure lb, page 2. At the tip of the fibers, a small chamber contains either the sample itself or an indicator for the sample, whose spectrophotometric properties change with the concentration...

  11. Analysis and Stability of Bent–Core Liquid Crystal Fibers

    E-Print Network [OSTI]

    2011-02-21T23:59:59.000Z

    Feb 21, 2011 ... We show that the relative size of the energy's elasticity con- ... energy to balance the tendency of surface tension to constrict the fiber and.

  12. Observation of images in graded-index multimode fiber

    E-Print Network [OSTI]

    Begum, Sultana

    1992-01-01T23:59:59.000Z

    by dipping one end of the fiber in methanol. This is done so that when this end is fused to the pay-out single-mode fiber by applying an arc, the blue dye does not get inside the fiber when the cladding melts. A laser trimming system is used to mark... vary with time due to thenrial drifts in the wavelength of the laser 27 source, or to thermal or mechanical phase shifts in the fiber. If an aperture such as misaligned splice or mode-selective loss such as micro-or macro-bending is present...

  13. ash fiber fundamental: Topics by E-print Network

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

    MIT - DSpace Summary: We demonstrate significant shifting of the fundamental bandgap of a hollow-core Bragg fiber by systematically filling the core with liquids of various...

  14. GENERIC FIBER RINGS OF MIXED POWER SERIES/POLYNOMIAL ...

    E-Print Network [OSTI]

    fibers encode important information about the structure of R. For example, the. local ring R is ... National Security Agency for its support. Typeset by AMS-TEX. 1

  15. Validation of Material Models for Automotive Carbon Fiber Composite...

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

    Validation of Material Models for Automotive Carbon Fiber Composite Structures (VMM) Libby Berger (General Motors), Omar Faruque (Ford) Co-Principal Investigators US Automotive...

  16. aramid fiber reinforced: Topics by E-print Network

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

    2 Micromechanics analysis of Kevlar-29 aramid fiber and epoxy resin microdroplet composite by Micro-Raman spectroscopy Engineering Websites Summary: Micromechanics analysis of...

  17. Fiber-Reinforced Polymer Composites: Pursuing the Promise

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

    over many structural materials, excellent corrosion resistance, and other desirable Carbon-fiber composite hood (inner panel) manufactured by Plasan Carbon Composites for the...

  18. NASA's Composite Portfolio: Department of Energy Workshop Fiber...

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

    NASA 's Composites Portfolio Department of Energy Workshop Fiber Reinforced Polymer Composites Manufacturing Presented by: John Vickers January 13, 2014 www.nasa.gov...

  19. Fiber Reinforced Polymer Composite Manufacturing - RFI DE-FOA...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    RFI DE-FOA-0000980: Summary of Responses Fiber Reinforced Polymer Composite Manufacturing - RFI DE-FOA-0000980: Summary of Responses Summary of Responses to Request for Information...

  20. Multiparameter Fiber Optic Sensing System for Monitoring Enhanced...

    Open Energy Info (EERE)

    sensing (DTSS), distributed pressure fiber Bragg gratings (FBG) and coherent Rayleigh optical time domain reflectometry (COTDR) for distributed vibration sensing will be...

  1. Wavelength Assignment in Multi-Fiber WDM Networks by ...

    E-Print Network [OSTI]

    In this paper, we study wavelength assignment problems in multi-fiber WDM net- ... A comparison with linear programming lower bounds reveals that the bounds ...

  2. Optimization Online - Wavelength Assignment in Multi-Fiber WDM ...

    E-Print Network [OSTI]

    Arie M.C.A. Koster

    2005-03-17T23:59:59.000Z

    Mar 17, 2005 ... By this relation, we show that for a network with an even number of fibers ... proceedings of the International Network Optimization Conference, ...

  3. Fiber optics interface for a dye laser oscillator and method

    DOE Patents [OSTI]

    Johnson, S.A.; Seppala, L.G.

    1984-06-13T23:59:59.000Z

    A dye laser oscillator in which one light beam is used to pump a continuous stream of dye within a cooperating dye chamber for producing a second, different beam is generally disclosed herein along with a specific arrangement including an optical fiber and a fiber optics interface for directing the pumping beam into the dye chamber. The specific fiber optics interface illustrated includes three cooperating lenses which together image one particular dimension of the pumping beam into the dye chamber from the output end of the optical fiber in order to insure that the dye chamber is properly illuminated by the pumping beam.

  4. Low Cost Carbon Fiber Research in the ALM Materials Program

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Carbon Fiber Research in the ALM Materials Program 27 February 2008 C. David (Dave) Warren Field Technical Manager Transportation Composite Materials Research Oak Ridge National...

  5. Biochar Produced from Anaerobically Digested Fiber Reduces Phosphorus...

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

    Lagoons. Abstract: This study evaluated the use of biochar produced from anaerobic digester dairy fiber (ADF) to sequester phosphorus (P) from dairy lagoons. The ADF was...

  6. Fiber optic quality assurance at the Nevada Test Site

    SciTech Connect (OSTI)

    Manning, J.; Baumgart, S.; Malone, R.; Thayer, D.

    1981-01-01T23:59:59.000Z

    A large number of fiber optic cables were used in support of a neutron imaging experiment at the Nevada Test Site. This paper describes the quality control testing of fiber components used on this experiment. The principal reason for quality control testing was to ensure reliable, high transmission fibers; a secondary reason was to gain data on a large sample of fiber cables in the field. Also described is the instrumentation developed for carrying out these field measurements. The design of the quality control instrumentation was a compromise between accuracy and simplicity of use.

  7. acid detergent fiber: Topics by E-print Network

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

    Recent work on pretreatment techniques includes: pretreatment of cedar with peracetic acid and steam explosion to improve... AMMONIA FIBER EXPLOSION (AFEX) TREATMENT OF GRASS A...

  8. High-power, hybrid Er:fiber/Tm:fiber frequency comb source in the 2 {\\mu}m wavelength region

    E-Print Network [OSTI]

    Adler, Florian

    2012-01-01T23:59:59.000Z

    We present a 2-\\mum frequency comb based on a reliable mode-locked Er:fiber laser with 100 MHz repetition rate. After shifting the spectrum of the amplified Er:fiber comb to longer wavelengths, a single-clad Tm/Ho:fiber is used as a self-pumped pre-amplifier to generate a coherent and broadband spectrum centered at 1.93 \\mum. Subsequently, a cladding-pumped Tm:fiber amplifier boosts the system to a maximum output power of 4.8 W at 1.96 \\mum. After compression in a compact grating compressor, our amplified Er:fiber/Tm:fiber hybrid system delivers as much as 2.9 W with a pulse duration of 141 fs. The system's comb properties are examined via heterodyne measurement.

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

    E-Print Network [OSTI]

    Dabholkar, Niranjan Shamsunder

    1999-01-01T23:59:59.000Z

    with vertical glass fibers as tools for shear strengthening and carbon fiber fabrics for flexural strengthening of concrete beams. The experimental study involved testing of two unreinforced control beams and seven other beams with different composite fiber...

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

    E-Print Network [OSTI]

    Rogers, John A.

    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, optical de- vice fabrication, optical fiber applications, optical fiber devices. I. INTRODUCTION TUNABLE

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

    DOE Patents [OSTI]

    Kramer, D.P.

    1994-08-09T23:59:59.000Z

    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.

  12. COMPRESSION STRENGTH OF CARBON FIBER LAMINATES CONTAINING FLAWS WITH FIBER WAVINESS

    E-Print Network [OSTI]

    compression strengths and failure strains which are borderline for wind turbine blade designs, depending upon the subject of recent studies of blade materials [1-5] and earlier studies of aerospace prepreg laminates [5 by RTM. Recent interest in blade materials has shown a significant shift toward carbon fiber and hybrids

  13. Collective Langevin Dynamics of Flexible Cytoskeletal Fibers

    E-Print Network [OSTI]

    Francois Nedelec; Dietrich Foethke

    2009-03-30T23:59:59.000Z

    We develop a numerical method to simulate mechanical objects in a viscous medium at a scale where inertia is negligible. Fibers, spheres and other voluminous objects are represented with points. Different types of connections are used to link the points together and in this way create composite mechanical structures. The motion of such structures in a Brownian environment is described by a first-order multivariate Langevin equation. We propose a computationally efficient method to integrate the equation, and illustrate the applicability of the method to cytoskeletal modeling with several examples.

  14. Kinetics of digestion f forage fiber components

    E-Print Network [OSTI]

    Van Hellen, Russell William

    1974-01-01T23:59:59.000Z

    . Herzudagrass Katurity Cuttings . . 69 INTHODUCTIOii Fiber is cell wall material composed chiefly of structural carbohydrates wnich are digested by the rumin- ant at one site, the reticulo-rumen, via microbial degra. ? dation and fermen ation to metabolitee... was thought to be involved when whole plant structure was digested in vitro or in situ in contrast to finely ground samples as used in foregoing experiments The forage entering the reticulo-rumen does so in a coarser physical form than that of a sample...

  15. Fiber Reinforced Polymer Composite Manufacturing Workshop

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742Energy Chinaof EnergyImpactOnSTATEMENT OF DAVIDTheJune 6, 2012.DepartmentDE-FOA-0001056:Fiber

  16. Low-Cost Carbon-Fiber Integration / Users Facility and Commercializati...

    Energy Savers [EERE]

    Low-Cost Carbon-Fiber Integration Users Facility and Commercialization of Textile Precursors Low-Cost Carbon-Fiber Integration Users Facility and Commercialization of Textile...

  17. ON THE SIMULATION OF KINK BANDS IN FIBER REINFORCED COMPOSITES

    E-Print Network [OSTI]

    ON THE SIMULATION OF KINK BANDS IN FIBER REINFORCED COMPOSITES Kim D. Sørensen , Lars P. Mikkelsen reinforced composites are carried out using the commercial finite element program ABAQUS. A smeared in fiber reinforced composites has been the subject of a number of recent investigations. It has been found

  18. Wood-Fiber/High-Density-Polyethylene Composites: Compounding Process

    E-Print Network [OSTI]

    Wood-Fiber/High-Density-Polyethylene Composites: Compounding Process J. Z. Lu,1 Q. Wu,1 I. I strength and flexural modulus of the resultant composites. With 50 wt % wood fiber, the optimum compounding of the modified blends and the dynamic mechanical properties of the resultant composites. The melt torque

  19. Design for a single mode erbium-doped fiber laser

    E-Print Network [OSTI]

    Wang, Jon-En

    1995-01-01T23:59:59.000Z

    The objective of this research was to design and fabricate a single-mode, narrow-linewidth linear erbium-doped fiber laser using a solid etalon for mode selection. This thesis describes the design of the linear laser which uses erbium-doped fiber...

  20. Design for a single mode erbium-doped fiber laser 

    E-Print Network [OSTI]

    Wang, Jon-En

    1995-01-01T23:59:59.000Z

    The objective of this research was to design and fabricate a single-mode, narrow-linewidth linear erbium-doped fiber laser using a solid etalon for mode selection. This thesis describes the design of the linear laser which uses erbium-doped fiber...

  1. Designed amyloid fibers as materials for selective carbon dioxide capture

    E-Print Network [OSTI]

    Designed amyloid fibers as materials for selective carbon dioxide capture Dan Lia,b,c,1 , Hiroyasu demonstrate that amyloids, self-assembling protein fibers, are effective for selective carbon dioxide capture formation rate is fast enough to capture carbon dioxide by dynamic separation, undiminished by the presence

  2. Manufacturing processes and molding of fiber-reinforced polyetheretherketone

    SciTech Connect (OSTI)

    Kempe, G.; Krauss, H. (DLR, Stuttgart (West Germany))

    1991-04-01T23:59:59.000Z

    The paper presents and discusses cetain procedures for manufacturing components from continuous fiber reinforced thermoplastics using carbon fiber-reinforced polyetheretherketone (PEEK). The manufacturing quality achieved has been examined and compared with the aid of bending tests and micrographs. Some thermal decomposition tests were also done. 5 refs.

  3. Accelerated Aging Effects on Kevlar KM2 Fiber Survivability

    E-Print Network [OSTI]

    Yang, Tony

    2013-04-12T23:59:59.000Z

    as an alternative test method to the pneumatic grip setup. ........................................ 87 ix LIST OF TABLES Page Table 1. DuPont?s Kevlar fiber grades and their tensile material properties ranked by ascending tensile modulus.... ................................................................................. 5 Table 2. Kevlar KM2 properties given by DuPont. ........................................................... 6 Table 3. Fiber rapid degradation Design of Experiment factors and levels. .................... 36 Table 4. Recorded experimentally...

  4. Porous polymer fibers for low-loss Terahertz guiding

    E-Print Network [OSTI]

    Skorobogatiy, Maksim

    of this fiber type is also compared to that of the equivalent sub-wavelength rod-in-the-air fiber the collective vibrational dynamics of a protein in liquid water by terahertz absorption spectroscopy", Protein. Kawase, "Laser terahertz-emission microscope for inspecting electrical faults in integrated circuits

  5. Postdoctoral Scholar position Area: Dietary Fiber and Obesity Management

    E-Print Network [OSTI]

    de Leon, Alex R.

    Postdoctoral Scholar position Area: Dietary Fiber and Obesity Management Duration: 2 years Start applications for a post-doctoral position in Fiber and Obesity. This position is a joint appointment microbiota in the context of obesity and type 2 diabetes. Dr. Reimer has developed animal models to study how

  6. HANSEN SOLUBILITY PARAMETERS FOR A CARBON FIBER/EPOXY COMPOSITE

    E-Print Network [OSTI]

    demonstrated as appropriate for the study of interactions between the materials in composite carbon fiberHANSEN SOLUBILITY PARAMETERS FOR A CARBON FIBER/EPOXY COMPOSITE Hélène Launay* , Charles Medom and strength-to-weight ratios are required. The mechanical performance of composite materials depends not only

  7. 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 a Waveguide Temperature Sensor? · Reliability - fiber optic sensors are immune to oxidizing or reducing Objectives · Develop a low cost, robust temperature sensor for monitoring fuel cell condition and performance

  8. Fiber Optic Sensors for PEM Fuel Cells Nigel David

    E-Print Network [OSTI]

    Victoria, University of

    Fiber Optic Sensors for PEM Fuel Cells by Nigel David B.Sc., Simon Fraser University, 2004 M or other means, without the permission of the author. #12;ii Fiber Optic Sensors for PEM Fuel Cells) and air- water two-phase flow sensors are developed and demonstrated based on optical fibre Bragg gratings

  9. Analogic fiber optic position sensor with nanometric resolution Frdric Lamarque

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Analogic fiber optic position sensor with nanometric resolution Frédéric Lamarque Université de of the sensor is presented as well as experimentation results. Keywords Fiber optic sensor, nanometric size is approximately 1.5x2.0x0.6 mm3 and the measurement resolution is 0.1 µm [4]. An optical sensor

  10. High Average Power, High Energy Short Pulse Fiber Laser System

    SciTech Connect (OSTI)

    Messerly, M J

    2007-11-13T23:59:59.000Z

    Recently continuous wave fiber laser systems with output powers in excess of 500W with good beam quality have been demonstrated [1]. High energy, ultrafast, chirped pulsed fiber laser systems have achieved record output energies of 1mJ [2]. However, these high-energy systems have not been scaled beyond a few watts of average output power. Fiber laser systems are attractive for many applications because they offer the promise of high efficiency, compact, robust systems that are turn key. Applications such as cutting, drilling and materials processing, front end systems for high energy pulsed lasers (such as petawatts) and laser based sources of high spatial coherence, high flux x-rays all require high energy short pulses and two of the three of these applications also require high average power. The challenge in creating a high energy chirped pulse fiber laser system is to find a way to scale the output energy while avoiding nonlinear effects and maintaining good beam quality in the amplifier fiber. To this end, our 3-year LDRD program sought to demonstrate a high energy, high average power fiber laser system. This work included exploring designs of large mode area optical fiber amplifiers for high energy systems as well as understanding the issues associated chirped pulse amplification in optical fiber amplifier systems.

  11. A two-mode fiber optic-bending sensor

    E-Print Network [OSTI]

    Covington, Charles Eric

    1993-01-01T23:59:59.000Z

    It is shown that a small slope in the refractive index profile of an optical fiber causes the two lowest order spatial modes to travel different distances from the geometrical center of the fiber. This effect increases by orders of magnitude...

  12. Extrinsic fiber optic displacement sensors and displacement sensing systems

    DOE Patents [OSTI]

    Murphy, K.A.; Gunther, M.F.; Vengsarkar, A.M.; Claus, R.O.

    1994-04-05T23:59:59.000Z

    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. 14 figures.

  13. Extrinsic fiber optic displacement sensors and displacement sensing systems

    DOE Patents [OSTI]

    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

    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.

  14. Evaluation of Plasma Resistant Hollow Fiber Membranes For Artificial Lungs

    E-Print Network [OSTI]

    Federspiel, William J.

    Evaluation of Plasma Resistant Hollow Fiber Membranes For Artificial Lungs HEIDE J. EASH,* HEATHER in artificial lungs (ox- ygenators) undergo plasma leakage (or wetting) in which blood plasma slowly fills2 gas permeance of a plasma resistant fiber imposes the greatest constraint upon artificial lung

  15. A Fiber Interferometer for the Magnetized Shock Experiment

    SciTech Connect (OSTI)

    Yoo, Christian [Los Alamos National Laboratory

    2012-08-30T23:59:59.000Z

    The Magnetized Shock Experiment (MSX) at Los Alamos National Laboratory requires remote diagnostics of plasma density. Laser interferometry can be used to determine the line-integrated density of the plasma. A multi-chord heterodyne fiber optic Mach-Zehnder interferometer is being assembled and integrated into the experiment. The advantage of the fiber coupling is that many different view chords can be easily obtained by simply moving transmit and receive fiber couplers. Several such fiber sets will be implemented to provide a time history of line-averaged density for several chords at once. The multiple chord data can then be Abel inverted to provide radially resolved spatial profiles of density. We describe the design and execution of this multiple fiber interferometer.

  16. Apparatus and method for carbon fiber surface treatment

    SciTech Connect (OSTI)

    Paulauskas, Felix L; Sherman, Daniel M

    2014-06-03T23:59:59.000Z

    An apparatus and method for enhancing the surface energy and/or surface chemistry of carbon fibers involves exposing the fibers to direct or indirect contact with atmospheric pressure plasma generated using a background gas containing at least some oxygen or other reactive species. The fiber may be exposed directly to the plasma, provided that the plasma is nonfilamentary, or the fiber may be exposed indirectly through contact with gases exhausting from a plasma discharge maintained in a separate volume. In either case, the process is carried out at or near atmospheric pressure, thereby eliminating the need for vacuum equipment. The process may be further modified by moistening the fibers with selected oxygen-containing liquids before exposure to the plasma.

  17. Measurement of large strains in ropes using plastic optical fibers

    DOE Patents [OSTI]

    Williams, Jerry Gene; Smith, David Barton; Muhs, Jeffrey David

    2006-02-14T23:59:59.000Z

    A method for the direct measurement of large strains in ropes in situ using a plastic optical fiber, for example, perfluorocarbon or polymethyl methacrylate and Optical Time-Domain Reflectometer or other light time-of-flight measurement instrumentation. Protective sheaths and guides are incorporated to protect the plastic optical fiber. In one embodiment, a small rope is braided around the plastic optical fiber to impose lateral compressive forces to restrain the plastic optical fiber from slipping and thus experience the same strain as the rope. Methods are described for making reflective interfaces along the length of the plastic optical fiber and to provide the capability to measure strain within discrete segments of the rope. Interpretation of the data allows one to calculate the accumulated strain at any point in time and to determine if the rope has experienced local damage.

  18. Apparatus and method for carbon fiber surface treatment

    DOE Patents [OSTI]

    Paulauskas, Felix L. (Knoxville, TN); Sherman, Daniel M. (Knoxville, TN)

    2012-07-24T23:59:59.000Z

    An apparatus and method for enhancing the surface energy and/or surface chemistry of carbon fibers involves exposing the fibers to direct or indirect contact with atmospheric pressure plasma generated using a background gas containing at least some oxygen or other reactive species. The fiber may be exposed directly to the plasma, provided that the plasma is nonfilamentary, or the fiber may be exposed indirectly through contact with gases exhausting from a plasma discharge maintained in a separate volume. In either case, the process is carried out at or near atmospheric pressure, thereby eliminating the need for vacuum equipment. The process may be further modified by moistening the fibers with selected oxygen-containing liquids before exposure to the plasma.

  19. Fiber optic-based regenerable biosensor

    DOE Patents [OSTI]

    Sepaniak, Michael J. (Knoxville, TN); Vo-Dinh, Tuan (Knoxville, TN)

    1993-01-01T23:59:59.000Z

    A fiber optic-based regenerable biosensor. The biosensor is particularly suitable for use in microscale work in situ. In one embodiment, the biosensor comprises a reaction chamber disposed adjacent the distal end of a waveguide and adapted to receive therein a quantity of a sample containing an analyte. Leading into the chamber is a plurality of capillary conduits suitable for introducing into the chamber antibodies or other reagents suitable for selective interaction with a predetermined analyte. Following such interaction, the contents of the chamber may be subjected to an incident energy signal for developing fluorescence within the chamber that is detectable via the optical fiber and which is representative of the presence, i.e. concentration, of the selected analyte. Regeneration of the biosensor is accomplished by replacement of the reagents and/or the analyte, or a combination of these, at least in part via one or more of the capillary conduits. The capillary conduits extend from their respective terminal ends that are in fluid communication with the chamber, away from the chamber to respective location(s) remote from the chamber thereby permitting in situ location of the chamber and remote manipulation and/or analysis of the activity with the chamber.

  20. Grizzly Substation Fiber Optics : Environmental Assessment.

    SciTech Connect (OSTI)

    United States. Bonneville Power Administration.

    1998-02-01T23:59:59.000Z

    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).

  1. Achieving "Green" Concrete Through The Use Of High Performance FiberThe Use Of High Performance Fiber

    E-Print Network [OSTI]

    Chao, Shih-Ho

    Achieving "Green" Concrete Through The Use Of High Performance FiberThe Use Of High Performance Fiber Reinforced Concrete ShihShih--Ho Chao,Ho Chao, Ph.DPh.D Assistant Professor, Department of Civil, 2008 #12;What is D rable Concrete?What is D rable Concrete?What is Durable Concrete?What is Durable

  2. The effect of second phase particles in the fiber/matrix interfacial strength of carbon fiber reinforced thermoset composites 

    E-Print Network [OSTI]

    Lu, Chung-Yuan

    1996-01-01T23:59:59.000Z

    The fiber/matrix interfacial strength of graphite fiber reinforced epoxy (DGEBF cured with diprimary amine (9,9-bis[3-methyl-4-aminophenyl]fluorene) has been studied to determine the effect of second phase additions of rubber and glass...

  3. Effect of high-temperature loading on mechanical properties of Nicalon fibers and Nicalon fiber/SiC matrix composites

    SciTech Connect (OSTI)

    Singh, D.; Singh, J.P.

    1993-01-01T23:59:59.000Z

    Results of an investigation into the effect of elevated temperature exposure on the strength distribution of Nicalon fibers as well on mechanical properties of Nicalon/SiC composites are reported in this paper. Single-fiber strength distribution of as-fabricated Nicalon fibers was obtained from bundle tests. Strength distributions of fractured fibers in as-fabricated Nicalon/SiC composites and after elevated temperature exposure of composites were assessed from measurements of fracture mirror radii. Variations in the mechanical properties of composites evaluated as a function of test temperatures are compared with those evaluated at room temperature and are correlated to the fiber strength characteristics. Limited tests were also conducted to investigate the effect of long term exposure at elevated temperatures on composite ultimate strength.

  4. Raman fiber optic probe assembly for use in hostile environments

    DOE Patents [OSTI]

    Schmucker, John E. (Hurt, VA); Falk, Jon C. (Pittsburgh, PA); Archer, William B. (Bethel Park, PA); Blasi, Raymond J. (Harrison City, PA)

    2000-01-01T23:59:59.000Z

    This invention provides a device for Raman spectroscopic measurement of composition and concentrations in a hostile environment by the use of a first fiber optic as a means of directing high intensity monochromatic light from a laser to the hostile environment and a second fiber optic to receive the lower intensity scattered light for transmittal to a monochromator for analysis. To avoid damage to the fiber optics, they are protected from the hostile environment. A preferred embodiment of the Raman fiber optic probe is able to obtain Raman spectra of corrosive gases and solutions at temperatures up to 600.degree. F. and pressures up to 2000 psi. The incident exciting fiber optic cable makes an angle of substantially 90.degree. with the collecting fiber optic cable. This 90.degree. geometry minimizes the Rayleigh scattering signal picked up by the collecting fiber, because the intensity of Rayleigh scattering is lowest in the direction perpendicular to the beam path of the exciting light and therefore a 90.degree. scattering geometry optimizes the signal to noise ratio.

  5. Carbon fiber composite characterization in adverse thermal environments.

    SciTech Connect (OSTI)

    Gomez-Vasquez, Sylvia; Brown, Alexander L.; Hubbard, Joshua A.; Ramirez, Ciro J.; Dodd, Amanda B.

    2011-05-01T23:59:59.000Z

    The behavior of carbon fiber aircraft composites was studied in adverse thermal environments. The effects of resin composition and fiber orientation were measured in two test configurations: 102 by 127 millimeter (mm) test coupons were irradiated at approximately 22.5 kW/m{sup 2} to measure thermal response, and 102 by 254 mm test coupons were irradiated at approximately 30.7 kW/m{sup 2} to characterize piloted flame spread in the vertically upward direction. Carbon-fiber composite materials with epoxy and bismaleimide resins, and uni-directional and woven fiber orientations, were tested. Bismaleimide samples produced less smoke, and were more resistant to flame spread, as expected for high temperature thermoset resins with characteristically lower heat release rates. All materials lost approximately 20-25% of their mass regardless of resin type, fiber orientation, or test configuration. Woven fiber composites displayed localized smoke jetting whereas uni-directional composites developed cracks parallel to the fibers from which smoke and flames emanated. Swelling and delamination were observed with volumetric expansion on the order of 100% to 200%. The purpose of this work was to provide validation data for SNL's foundational thermal and combustion modeling capabilities.

  6. RADIATION EFFECTS ON EPOXY CARBON FIBER COMPOSITE

    SciTech Connect (OSTI)

    Hoffman, E

    2008-05-30T23:59:59.000Z

    Carbon fiber-reinforced bisphenol-A epoxy matrix composite was evaluated for gamma radiation resistance. The composite was exposed to total gamma doses of 50, 100, and 200 Mrad. Irradiated and baseline samples were tested for tensile strength, hardness and evaluated using FTIR (Fourier transform infrared) spectroscopy and DSC (differential scanning calorimetry) for structural changes. Scanning electron microscopy was used to evaluate microstructural behavior. Mechanical testing of the composite bars revealed no apparent change in modulus, strain to failure, or fracture strength after exposures. However, testing of only the epoxy matrix revealed changes in hardness, thermal properties, and FTIR results with increasing gamma irradiation. The results suggest the epoxy within the composite can be affected by exposure to gamma irradiation.

  7. ULTRAFAST OPTICS AND OPTICAL FIBER COMMUNICATIONS LABORATORYLEOS 2003 Multiple Output Channel

    E-Print Network [OSTI]

    Purdue University

    DSTAWG DST Pulse Shaper Fiber ports Imaging optics U.S. Quarter #12;ULTRAFAST OPTICS AND OPTICAL FIBER;ULTRAFAST OPTICS AND OPTICAL FIBER COMMUNICATIONS LABORATORYLEOS 2003 One Guide ­ One Pulse Pulses slab Loss-engineering to control relative pulse amplitude. #12;ULTRAFAST OPTICS AND OPTICAL FIBER

  8. FAILURE OF HIERARCHICAL DISTRIBUTIONS OF FIBER BUNDLES. II ANDREI M. GABRIELOV

    E-Print Network [OSTI]

    Gabrielov, Andrei

    will assume that the fibers in a given bundle share equally the load supported by that bundle. Thus, a given) of the failure threshold of fiber bundles organized in hierarchical fashion, we prove by analytic methods , or one fiber fails under its load and redistributes that load to the surviving fiber which then fails

  9. Advanced Optical Modulation Formats and Their Comparison in Fiber-Optic Systems

    E-Print Network [OSTI]

    Kansas, University of

    Advanced Optical Modulation Formats and Their Comparison in Fiber-Optic Systems R Hui, S. Zhang, B crosstalks in SCM/WDM optical systems and the impact due to fiber characteristics. We also demonstrated decisions on the fiber plant investments and fiber-optic equipment purchasing. Our comparative study

  10. Mechanical reliability of silica optical fiber: a case study for a biomedical application

    E-Print Network [OSTI]

    Matthewson, M. John

    Mechanical reliability of silica optical fiber: a case study for a biomedical application Yunn, Piscataway, NJ 08854-8065 ABSTRACT The mechanical reliability of optical fiber used in certain biomedical the fiber can be safely used. In this paper we study two commercially available optical fibers designed

  11. Next Generation Optical Fiber for IR Applications: Novel Materials and NanoScale Textures

    E-Print Network [OSTI]

    Van Stryland, Eric

    Next Generation Optical Fiber for IR Applications: Novel Materials and NanoScale Textures Axel, Orlando, FL 32816, USA #12;Outline · Impact of fiber optics · What are next generation optical fibers achievements concerning the transmission of light in fibers for optical communication" Charles K. Kao Brief

  12. Optical properties of single-crystal sapphire fibers Rick K. Nubling and James A. Harrington

    E-Print Network [OSTI]

    Optical properties of single-crystal sapphire fibers Rick K. Nubling and James A. Harrington Single.4­0.3 dB m at 2.94 m. These fibers delivered 4.7 W at 10 Hz of Er:YAG laser power. © 1997 Optical Society of America Key words: Infrared fibers, sapphire fibers, Er:YAG lasers, optical properties. 1. Introduction

  13. Description and performance of a highly versatile, low-cost fiber-optic confocal Raman microscope

    E-Print Network [OSTI]

    Myrick, Michael Lenn

    Description and performance of a highly versatile, low-cost fiber-optic confocal Raman microscope C for publication 29 September 1995 A versatile fiber-optic confocal Raman microscope has been developed. Fiber and disadvantages.11,12 We report here the development of an automated highly versatile fiber-optic confocal Raman

  14. Environmental effects on fatigue and lifetime predictions for silica optical fibers

    E-Print Network [OSTI]

    Matthewson, M. John

    Environmental effects on fatigue and lifetime predictions for silica optical fibers M. John optical fiber on the environmental parameters temperature, humidity and pH. It is shown that the stress used by the fiber optics industry provides a good fit to fatigue data for high strength fiber

  15. Development of a 1319-nm Laser Radar Using Fiber Optics and RF Pulse Compression

    E-Print Network [OSTI]

    Kansas, University of

    Development of a 1319-nm Laser Radar Using Fiber Optics and RF Pulse Compression Christopher T of this concept. Our laboratory breadboard uses standard, single-mode optical fiber, off-the-shelf fiber-optic IMPLEMENTATION 3.1 Transmitter--Single-mode laser 3.2 Transmitter--Single-mode fiber 3.3 Transmitter--Optical

  16. Fiber optic in vivo imaging in the mammalian nervous system Amit D Mehta1,2

    E-Print Network [OSTI]

    Schnitzer, Mark

    Fiber optic in vivo imaging in the mammalian nervous system Amit D Mehta1,2 , Juergen C Jung1 functionality of optical fiber and fiber optic devices are enabling several new modalities for imaging that uses assemblies of fiber optic emitters and detectors on the cranium for volumetric imaging of brain

  17. Method of making a continuous ceramic fiber composite hot gas filter

    DOE Patents [OSTI]

    Hill, Charles A. (Lynchburg, VA); Wagner, Richard A. (Lynchburg, VA); Komoroski, Ronald G. (Lynchburg, VA); Gunter, Greg A. (Lynchburg, VA); Barringer, Eric A. (Lynchburg, VA); Goettler, Richard W. (Lynchburg, VA)

    1999-01-01T23:59:59.000Z

    A ceramic fiber composite structure particularly suitable for use as a hot gas cleanup ceramic fiber composite filter and method of making same from ceramic composite material has a structure which provides for increased strength and toughness in high temperature environments. The ceramic fiber composite structure or filter is made by a process in which a continuous ceramic fiber is intimately surrounded by discontinuous chopped ceramic fibers during manufacture to produce a ceramic fiber composite preform which is then bonded using various ceramic binders. The ceramic fiber composite preform is then fired to create a bond phase at the fiber contact points. Parameters such as fiber tension, spacing, and the relative proportions of the continuous ceramic fiber and chopped ceramic fibers can be varied as the continuous ceramic fiber and chopped ceramic fiber are simultaneously formed on the porous vacuum mandrel to obtain a desired distribution of the continuous ceramic fiber and the chopped ceramic fiber in the ceramic fiber composite structure or filter.

  18. Propagation of ultrashort pulses in multimode fiber in space and time

    E-Print Network [OSTI]

    Fainman, Yeshaiahu

    correlators References and Links 1. A. Yariv, "Three-dimensional pictorial transmission in fibers," Appl. Phys

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

    E-Print Network [OSTI]

    2007-01-01T23:59:59.000Z

    Sensors and Actuators B 123 (2007) 594­605 Fiber optic sensing of liquid refractive index Argha rights reserved. Keywords: Liquid refractive index sensor; Fiber optic refractive index sensor; Refractive index sensitivity of uncladded fiber; Uncladded optical fiber as sensor 1. Introduction

  20. Modeling and evaluating the performance of Brillouin distributed optical fiber sensors

    E-Print Network [OSTI]

    Dalang, Robert C.

    Modeling and evaluating the performance of Brillouin distributed optical fiber sensors Marcelo A analysis of the key factors impacting on the performance of Brillouin distributed optical fiber sensors of America OCIS codes: (060.2310) Fiber optics; (060.2370) Fiber optics sensors; (290.5900) Scattering

  1. The use of optical fiber in safety-system design

    SciTech Connect (OSTI)

    Kugler, B.A.

    1988-06-01T23:59:59.000Z

    This paper summarizes the design, installation, and performance of an optical-fiber safety system installed for testing purposes on a production platform in the Gulf of Mexico. This system was installed on a chemelectric treater to monitor five end devices and to determine the feasibility of using fiber optics rather than pneumatics or an electrical system in a harsh environment. Included with a performance summary is a brief history of optical fiber and the potential for these types of safety systems in oilfield applications.

  2. Distributed Fiber Optic Gas Sensing for Harsh Environment

    SciTech Connect (OSTI)

    Juntao Wu

    2008-03-14T23:59:59.000Z

    This report summarizes work to develop a novel distributed fiber-optic micro-sensor that is capable of detecting common fossil fuel gases in harsh environments. During the 32-month research and development (R&D) program, GE Global Research successfully synthesized sensing materials using two techniques: sol-gel based fiber surface coating and magnetron sputtering based fiber micro-sensor integration. Palladium nanocrystalline embedded silica matrix material (nc-Pd/Silica), nanocrystalline palladium oxides (nc-PdO{sub x}) and palladium alloy (nc-PdAuN{sub 1}), and nanocrystalline tungsten (nc-WO{sub x}) sensing materials were identified to have high sensitivity and selectivity to hydrogen; while the palladium doped and un-doped nanocrystalline tin oxide (nc-PdSnO{sub 2} and nc-SnO{sub 2}) materials were verified to have high sensitivity and selectivity to carbon monoxide. The fiber micro-sensor comprises an apodized long-period grating in a single-mode fiber, and the fiber grating cladding surface was functionalized by above sensing materials with a typical thickness ranging from a few tens of nanometers to a few hundred nanometers. GE found that the morphologies of such sensing nanomaterials are either nanoparticle film or nanoporous film with a typical size distribution from 5-10 nanometers. nc-PdO{sub x} and alloy sensing materials were found to be highly sensitive to hydrogen gas within the temperature range from ambient to 150 C, while nc-Pd/Silica and nc-WO{sub x} sensing materials were found to be suitable to be operated from 150 C to 500 C for hydrogen gas detection. The palladium doped and un-doped nc-SnO{sub 2} materials also demonstrated sensitivity to carbon monoxide gas at approximately 500 C. The prototyped fiber gas sensing system developed in this R&D program is based on wavelength-division-multiplexing technology in which each fiber sensor is identified according to its transmission spectra features within the guiding mode and cladding modes. The interaction between the sensing material and fossil fuel gas results in a refractive index change and optical absorption in the sensing layer. This induces mode coupling strength and boundary conditions changes and thereby shifts the central wavelengths of the guiding mode and cladding modes propagation. GE's experiments demonstrated that such an interaction between the fossil fuel gas and sensing material not only shifts the central wavelengths of the guide mode and cladding modes propagation, but also alters their power loss characteristics. The integrated fiber gas sensing system includes multiple fiber gas sensors, fiber Bragg grating-based temperature sensors, fiber optical interrogator, and signal processing software.

  3. Activated carbon fiber composite material and method of making

    DOE Patents [OSTI]

    Burchell, Timothy D. (Oak Ridge, TN); Weaver, Charles E. (Knoxville, TN); Chilcoat, Bill R. (Knoxville, TN); Derbyshire, Frank (Lexington, KY); Jagtoyen, Marit (Lexington, KY)

    2001-01-01T23:59:59.000Z

    An activated carbon fiber composite for separation and purification, or catalytic processing of fluids is described. The activated composite comprises carbon fibers rigidly bonded to form an open, permeable, rigid monolith capable of being formed to near-net-shape. Separation and purification of gases are effected by means of a controlled pore structure that is developed in the carbon fibers contained in the composite. The open, permeable structure allows the free flow of gases through the monolith accompanied by high rates of adsorption. By modification of the pore structure and bulk density the composite can be rendered suitable for applications such as gas storage, catalysis, and liquid phase processing.

  4. Activated carbon fiber composite material and method of making

    DOE Patents [OSTI]

    Burchell, Timothy D. (Oak Ridge, TN); Weaver, Charles E. (Knoxville, TN); Chilcoat, Bill R. (Knoxville, TN); Derbyshire, Frank (Lexington, KY); Jagtoyen, Marit (Lexington, KY)

    2000-01-01T23:59:59.000Z

    An activated carbon fiber composite for separation and purification, or catalytic processing of fluids is described. The activated composite comprises carbon fibers rigidly bonded to form an open, permeable, rigid monolith capable of being formed to near-net-shape. Separation and purification of gases are effected by means of a controlled pore structure that is developed in the carbon fibers contained in the composite. The open, permeable structure allows the free flow of gases through the monolith accompanied by high rates of adsorption. By modification of the pore structure and bulk density the composite can be rendered suitable for applications such as gas storage, catalysis, and liquid phase processing.

  5. Quantum networking of microwave photons using optical fibers

    E-Print Network [OSTI]

    B. D. Clader

    2014-07-17T23:59:59.000Z

    We describe an adiabatic state transfer mechanism that allows for high-fidelity transfer of a microwave quantum state from one cavity to another through an optical fiber. The conversion from microwave frequency to optical frequency is enabled by an optomechanical transducer. The transfer process utilizes a combined dark state of the mechanical oscillator and fiber modes, making it robust against both mechanical and fiber loss. We anticipate this scheme being an enabling component of a hybrid quantum computing architecture consisting of superconducting qubits with optical interconnects.

  6. Tailored photon-pair generation in optical fibers

    E-Print Network [OSTI]

    Offir Cohen; Jeff S. Lundeen; Brian J. Smith; Graciana Puentes; Peter J. Mosley; Ian A. Walmsley

    2009-04-14T23:59:59.000Z

    We experimentally control the spectral structure of photon pairs created via spontaneous four-wave mixing in microstructured fibers. By fabricating fibers with designed dispersion, one can manipulate the photons' wavelengths, joint spectrum, and, thus, entanglement. As an example, we produce photon-pairs with no spectral correlations, allowing direct heralding of single photons in pure-state wave packets without filtering. We achieve an experimental purity of $85.9\\pm1.6%$, while theoretical analysis and preliminary tests suggest 94.5% purity is possible with a much longer fiber.

  7. Fabrication of fiber supported ionic liquids and methods of use

    DOE Patents [OSTI]

    Luebke, David R; Wickramanayake, Shan

    2013-02-26T23:59:59.000Z

    One or more embodiments relates to the production of a fabricated fiber having an asymmetric polymer network and having an immobilized liquid such as an ionic liquid within the pores of the polymer network. The process produces the fabricated fiber in a dry-wet spinning process using a homogenous dope solution, providing significant advantage over current fabrication methods for liquid-supporting polymers. The fabricated fibers may be effectively utilized for the separation of a chemical species from a mixture based on the selection of the polymer, the liquid, and the solvent utilized in the dope.

  8. Titanium diboride ceramic fiber composites for Hall-Heroult cells

    DOE Patents [OSTI]

    Besmann, T.M.; Lowden, R.A.

    1990-05-29T23:59:59.000Z

    An improved cathode structure is described for Hall-Heroult cells for the electrolytic production of aluminum metal. This cathode structure is a preform fiber base material that is infiltrated with electrically conductive titanium diboride using chemical vapor infiltration techniques. The structure exhibits good fracture toughness, and is sufficiently resistant to attack by molten aluminum. Typically, the base can be made from a mat of high purity silicon carbide fibers. Other ceramic or carbon fibers that do not degrade at temperatures below about 1000 C can be used.

  9. Sensitivity analysis and model for fiber optic gyroscope

    E-Print Network [OSTI]

    Vandervort, Annette Louise

    1990-01-01T23:59:59.000Z

    ) to eliminate hL and N, the Sagnac phase shift can be expressed in the widely recognized form hg=(4xLR/Xc) 0 It should be noted that, while the magnitude of the phase shift can be increased by increasing the dimension L, the length of the fiber in the coil... as it is wound into a coQ induces internal stresses which 10 ' Ol 10 O 0 IJJ C3 +~ 10 LIJ I- M 10 e= 1E-4 a= 1E-5 10 10 ' 10 FIBER COIL LENGTH [km] FIGURE 7. POLARIZATION ERROR VS. FIBER COIL LENGTH 31 Table 3. Parameters for Polarization Error...

  10. Titanium diboride ceramic fiber composites for Hall-Heroult cells

    DOE Patents [OSTI]

    Besmann, Theodore M. (Knoxville, TN); Lowden, Richard A. (Knoxville, TN)

    1990-01-01T23:59:59.000Z

    An improved cathode structure for Hall-Heroult cells for the electrolytic production of aluminum metal. This cathode structure is a preform fiber base material that is infiltrated with electrically conductive titanium diboride using chemical vapor infiltration techniques. The structure exhibits good fracture toughness, and is sufficiently resistant to attack by molten aluminum. Typically, the base can be made from a mat of high purity silicon carbide fibers. Other ceramic or carbon fibers that do not degrade at temperatures below about 1000 deg. C can be used.

  11. Metal matrix coated fiber composites and the methods of manufacturing such composites

    DOE Patents [OSTI]

    Weeks, J.K. Jr.; Gensse, C.

    1993-09-14T23:59:59.000Z

    A fiber coating which allows ceramic or metal fibers to be wetted by molten metals is disclosed. The coating inhibits degradation of the physical properties caused by chemical reaction between the fiber and the coating itself or between the fiber and the metal matrix. The fiber coating preferably includes at least a wetting layer, and in some applications, a wetting layer and a barrier layer between the fiber and the wetting layer. The wetting layer promotes fiber wetting by the metal matrix. The barrier layer inhibits fiber degradation. The fiber coating permits the fibers to be infiltrated with the metal matrix resulting in composites having unique properties not obtainable in pure materials. 8 figures.

  12. Method for separating the non-inked cellulose fibers from the inked cellulose fibers in cellulosic materials

    DOE Patents [OSTI]

    Woodward, J.

    1998-12-01T23:59:59.000Z

    A method for enzymatically separating the non-inked cellulose fibers from the inked cellulose fibers in cellulosic materials. The cellulosic material, such as newsprint, is introduced into a first chamber containing a plastic canvas basket. This first chamber is in fluid communication, via plastic tubing, with a second chamber containing cellobiase beads in a plastic canvas basket. Cellulase is then introduced into the first chamber. A programmable pump then controls the flow rate between the two chambers. The action of cellulase and stirring in the first chamber results in the production of a slurry of newsprint pulp in the first chamber. This slurry contains non-inked fibers, inked fibers, and some cellobiose. The inked fibers and cellobiose flow from the first chamber to the second chamber, whereas the non-inked fibers remain in the first chamber because they are too large to pass through the pores of the plastic canvas basket. The resulting non-inked and inked fibers are then recovered. 6 figs.

  13. Method for separating the non-inked cellulose fibers from the inked cellulose fibers in cellulosic materials

    DOE Patents [OSTI]

    Woodward, Jonathan (Kingston, TN)

    1998-01-01T23:59:59.000Z

    A method for enzymatically separating the non-inked cellulose fibers from the inked cellulose fibers in cellulosic materials. The cellulosic material, such as newsprint, is introduced into a first chamber containing a plastic canvas basket. This first chamber is in fluid communication, via plastic tubing, with a second chamber containing cellobiase beads in a plastic canvas basket. Cellulase is then introduced into the first chamber. A programmable pump then controls the flow rate between the two chambers. The action of cellulase and stirring in the first chamber results in the production of a slurry of newsprint pulp in the first chamber. This slurry contains non-inked fibers, inked fibers, and some cellobiose. The inked fibers and cellobiose flow from the first chamber to the second chamber, whereas the non-inked fibers remain in the first chamber because they are too large to pass through the pores of the plastic canvas basket. The resulting non-inked and inked fibers are then recovered.

  14. Microsoft Word - LSN_FiberInstall_CX.docx

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

    BPA's Ponderosa-Pilot Butte 230-kilovolt (kV) and Redmond-Pilot Butte 230-kV transmission lines in Deschutes County, Oregon. BPA has determined that the fiber would not...

  15. Microsoft Word - Bell-BoundaryFiber_CX_2013

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

    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...

  16. Microsoft Word - GrandCouleeFiber_CX_2014.docx

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

    it into compliance. The fiber would be moved underground through a new conduit of 4-foot PVC pipe that would be installed as part of this project. The conduit would be 130 feet...

  17. asymmetric hollow fiber: Topics by E-print Network

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

    cleaner Fazael Mosaferi; Farid Delijani; Fateme Ekhtiary Koshky 15 Ultra-large bandwidth hollow-core guiding in all-silica Bragg fibers with nano-supports CERN Preprints Summary:...

  18. Fabrication and characterization of thermally drawn fiber capacitors

    E-Print Network [OSTI]

    Lestoquoy, Guillaume

    We report on the fabrication of all-in-fiber capacitors with poly(vinylidene fluoride) (PVDF) as the dielectric material. Electrodes made of conductive polymer are separated by a PVDF thin film within a polycarbonate casing ...

  19. Fiber optic signal amplifier using thermoelectric power generation

    DOE Patents [OSTI]

    Hart, M.M.

    1993-01-01T23:59:59.000Z

    A remote fiber optic signal amplifier for use as a repeater/amplifier, such as in transoceanic communication, 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 material resistant to corrosion and biological growth and are directly exposed to the outside, such as the ocean water in transoceanic communications.

  20. Fiber optic signal amplifier using thermoelectric power generation

    DOE Patents [OSTI]

    Hart, Mark M. (Aiken, SC)

    1995-01-01T23:59:59.000Z

    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.

  1. Sandia National Laboratories: fiber-reinforced polymer materials

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

    of fiber-reinforced polymers (composites) and other materials used to construct wind-turbine blades. The average wind turbine installed in 1989 had a power rating of 0.225 MW and...

  2. Exploration of in-fiber nanostructures from capillary instability

    E-Print Network [OSTI]

    Deng, D. S.

    A new class of multi-material fiber that incorporates micrometer-thickness concentric-cylindrical sheets of glass into polymer matrix has emerged. The ultimate lower limit of feature size and recent observation of interesting ...

  3. Fiber-optical switch controlled by a single atom

    E-Print Network [OSTI]

    Danny O'Shea; Christian Junge; Jürgen Volz; Arno Rauschenbeutel

    2013-09-12T23:59:59.000Z

    We demonstrate highly efficient switching of optical signals between two optical fibers controlled by a single atom. The key element of our experiment is a whispering-gallery mode bottle microresonator, which is coupled to a single atom and interfaced by two tapered fiber couplers. Even in the presence of the coupling fibers, the atom--resonator system reaches the strong coupling regime of cavity quantum electrodynamics (CQED), leading to a vacuum Rabi splitting in the excitation spectrum. We systematically investigate the switching efficiency of our system, i.e., the probability that the CQED fiber-optical switch redirects the light into the desired output. We obtain a large redirection efficiency reaching a raw fidelity of more than 60% without post-selection.

  4. Manipulating time-bin qubits with fiber optics components

    E-Print Network [OSTI]

    Felix Bussieres; Yasaman Soudagar; Guido Berlin; Suzanne Lacroix; Nicolas Godbout

    2006-05-06T23:59:59.000Z

    We propose two experimental schemes to implement arbitrary unitary single qubit operations on single photons encoded in time-bin qubits. Both schemes require fiber optics components that are available with current technology.

  5. Robust transmission of non-Gaussian entanglement over optical fibers

    E-Print Network [OSTI]

    Asoka Biswas; Daniel A. Lidar

    2006-05-17T23:59:59.000Z

    We show how the entanglement in a wide range of continuous variable non-Gaussian states can be preserved against decoherence for long-range quantum communication through an optical fiber. We apply protection via decoherence-free subspaces and quantum dynamical decoupling to this end. The latter is implemented by inserting phase shifters at regular intervals $\\Delta $ inside the fiber, where $\\Delta $ is roughly the ratio of the speed of light in the fiber to the bath high-frequency cutoff. Detailed estimates of relevant parameters are provided using the boson-boson model of system-bath interaction for silica fibers, and $\\Delta $ is found to be on the order of a millimeter.

  6. Signal processing for fiber optic acoustic sensor system

    E-Print Network [OSTI]

    Zhu, Juhong

    2000-01-01T23:59:59.000Z

    pulses from a single mode laser. Signals from multiple sensors in the array are separated and demultiplexed. The acoustic pressure information is determined by processing the returned optical pulses using a fiber Mach-Zehnder interferometer as an optical...

  7. Holographic imaging of natural-fiber-containing materials

    DOE Patents [OSTI]

    Bunch, Kyle J [Richland, WA; Tucker, Brian J [Pasco, WA; Severtsen, Ronald H [Richland, WA; Hall, Thomas E [Kennewick, WA; McMakin, Douglas L [Richland, WA; Lechelt, Wayne M [West Richland, WA; Griffin, Jeffrey W [Kennewick, WA; Sheen, David M [Richland, WA

    2010-12-21T23:59:59.000Z

    The present invention includes methods and apparatuses for imaging material properties in natural-fiber-containing materials. In particular, the images can provide quantified measures of localized moisture content. Embodiments of the invention utilize an array of antennas and at least one transceiver to collect amplitude and phase data from radiation interacting with the natural-fiber-containing materials. The antennas and the transceivers are configured to transmit and receive electromagnetic radiation at one or more frequencies, which are between 50 MHz and 1 THz. A conveyance system passes the natural-fiber-containing materials through a field of view of the array of antennas. A computing device is configured to apply a synthetic imaging algorithm to construct a three-dimensional image of the natural-fiber-containing materials that provides a quantified measure of localized moisture content. The image and the quantified measure are both based on the amplitude data, the phase data, or both.

  8. Use of fiber reinforced polymer composite in bridge structures

    E-Print Network [OSTI]

    Tuakta, Chakrapan, 1980-

    2005-01-01T23:59:59.000Z

    Fiber reinforced polymer composite (FRP) is a new construction material, gradually gaining acceptance from civil engineers. Bridge engineering is among the fields in civil engineering benefiting from the introduction of ...

  9. Optical fiber based ultrashort pulse multispectral nonlinear optical microscopy

    E-Print Network [OSTI]

    Larson, Adam Michael

    2009-05-15T23:59:59.000Z

    Nonlinear optical microscopy (NLOM) utilizing femtosecond laser pulses is well suited for imaging living tissues. This work reports on the design and development of an optical fiber based multispectral NLOM developed around a laser generating...

  10. Lightweight concrete : investigations into the production of natural fiber reinforcement

    E-Print Network [OSTI]

    Garbis, Leonidia Maria

    2013-01-01T23:59:59.000Z

    The purpose of this study is to investigate the benefits of adding natural fiber tensile reinforcement to aerated concrete. Concrete is a great composite material which can be created in various proportions and with various ...

  11. Hermetic fiber optic-to-metal connection technique

    DOE Patents [OSTI]

    Kramer, Daniel P. (Centerville, OH)

    1992-09-01T23:59:59.000Z

    A glass-to-glass hermetic sealing technique is disclosed which can be used to splice lengths of glass fibers together. A solid glass preform is inserted into the cavity of a metal component which is then heated to melt the glass. An end of an optical fiber is then advanced into the molten glass and the entire structure cooled to solidify the glass in sealing engagement with the optical fiber end and the metal cavity. The surface of the re-solidified glass may be machined for mating engagement with another component to make a spliced fiber optic connection. The resultant structure has a helium leak rate of less than 1.times.10.sup.-8 cm.sup.3 /sec.

  12. aramid fibers: Topics by E-print Network

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

    mesh. Author contacts Authors E with a suitable fiber mesh made of high-performance materials such as aramid, are now being studied Meyer, Christian 3 Nitrogen in aramid-based...

  13. A fiber optic probe for oxygen partial pressure sensing

    E-Print Network [OSTI]

    Schlain, Leslie Ariel

    1986-01-01T23:59:59.000Z

    fiber detection methods because the excitation wavelength (468 nm) and the emmission wavelength (514 nm) are both in the visible portion of the spectrum. Fluoro-green gold is available commercially from BASF-Wyandote Corporation. Samples...

  14. Microsoft Word - CX-Midway-Vantage-Fiber.doc

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

    optic cable would replace the overhead groundwire (OHGW) on the Midway-Rocky Ford No.1 transmission towers. The fiber would span from a tower in the Midway Substation yard to...

  15. Beam shaping element for compact fiber injection systems

    SciTech Connect (OSTI)

    Weichman, L.S.; Dickey, F.M.; Shagam, R.N.

    2000-01-05T23:59:59.000Z

    Injection of high power, multi-mode laser profiles into a fiber optic delivery system requires controlling a number of injection parameters to maximize throughput and minimize concerns for optical damage both at the entrance and exit faces of the fiber optic. A simple method for simultaneously achieving a compact fiber injection geometry and control of these injection parameters, independent of the input source characteristics, is provided by a refractive lenslet array and simple injection lens configuration. Design criteria together with analytical and experimental results for the refractive lenslet array and short focal length injection lens are presented. This arrangement provides a uniform spatial intensity distribution at the fiber injection plane to a large degree independent of the source mode structure, spatial profile, divergence, size, and/or alignment to the injection system. This technique has application to a number of laser systems where uniform illumination of a target or remote delivery of high peak power is desired.

  16. Fiber Reinforced Polymer Composite Manufacturing Workshop “Save the Date”

    Office of Energy Efficiency and Renewable Energy (EERE)

    The U.S. Department of Energy’s Advanced Manufacturing Office plans to host a Fiber Reinforced Polymer Composite Manufacturing Workshop in the Washington D.C. area on Monday January 13, 2014.

  17. Demonstrating Innovative Low-Cost Carbon Fiber for Energy and...

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

    Demonstrating Innovative Low-Cost Carbon Fiber for Energy and National Security Applications Front-end creel for processing precursor in tow format In-line melt spinning for...

  18. Demonstrating LED and Fiber Optic Lighting in Commissary Applications

    Broader source: Energy.gov [DOE]

    Presentation—given at the Federal Utility Partnership Working Group (FUPWG) Fall 2008 meeting—covers goals of the project and applications for light-emitting diodes (LEDs) and fiber optic lighting.

  19. ON FIBERED COMMENSURABILITY DANNY CALEGARI, HONGBIN SUN, AND SHICHENG WANG

    E-Print Network [OSTI]

    McReynolds, Ben

    ON FIBERED COMMENSURABILITY DANNY CALEGARI, HONGBIN SUN, AND SHICHENG WANG Abstract. This paper fibrations of M; Date: June 28, 2010. 1 #12;2 DANNY CALEGARI, HONGBIN SUN, AND SHICHENG WANG hence M has

  20. Mesoporous-silica films, fibers, and powders by evaporation ...

    Office of Scientific and Technical Information (OSTI)

    fiber formation starts with a similar silica precursor solution but with an added pre-polymer making a pituitous mixture that is drawn into a thin strand from which solvent is...

  1. Tennessee: Oak Ridge National Laboratory Optimizes Carbon Fiber...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    from a melt-spun process and will continue to develop and optimize the process. Further optimization of these processes has the potential to result in carbon fibers with...

  2. Design and fabrication of efficient fiber to chip couplers

    E-Print Network [OSTI]

    Araghchini, Mohammad

    2008-01-01T23:59:59.000Z

    Efficient fiber to chip couplers are essential for overall efficiency of integrated photonic devices. In this thesis new techniques are developed including using an optimization algorithm for designing adiabatic tapers and ...

  3. Carbon-Fiber-Reinforced Elastomers: "Materials by Design" Approach...

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

    Carbon-Fiber-Reinforced Elastomers: "Materials by Design" Approach to Property Tuning with Applications to Impact-Resistant Structures Apr 22 2015 02:00 PM - 03:00 PM Thomas L....

  4. Fiber optic signal amplifier using thermoelectric power generation

    DOE Patents [OSTI]

    Hart, M.M.

    1995-04-18T23:59:59.000Z

    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.

  5. Angular characteristics of a multimode fiber surface plasmon resonance sensor

    E-Print Network [OSTI]

    Tan, Zhixin; Li, Xuejin; Chen, Yuzhi; Hong, Xueming; Fan, Ping

    2015-01-01T23:59:59.000Z

    In this paper the angular characteristics of a multimode fiber SPR sensor are investigated theoretically. By separating the contributions of beams incident at different angles, a compact model is presented to predict the shift of the resonance wavelength with respect to the angle and the environmental refractive index. The result suggests that the performance of conventional fiber SPR sensors can be substantially improved by optimizing the incident angle.

  6. Fiber glass pipe effective for offshore water handling

    SciTech Connect (OSTI)

    Turnipseed, S.P. [Chevron Research and Technology Co., Richmond, CA (United States)

    1995-07-03T23:59:59.000Z

    Excellent corrosion resistance, weight savings, ease of construction, and reduced maintenance make fiber glass pipe attractive for water-handling service on offshore platforms. This article covers guidelines for fiber glass pipe installations and presents a number of case histories from the industry and Chevron Corp. Applications include seawater treatment, water injection, sewage and drains, deluge fire water systems, hose reel fire water, seawater cooling, produced water, and potable water. The paper gives usage guidelines.

  7. Modeling the thermal conductivity of fiber-reinforced ceramic composites

    SciTech Connect (OSTI)

    Beecher, S.C.; Dinwiddie, R.B.

    1993-06-01T23:59:59.000Z

    A review of models for the prediction of the thermal conductivity of uni-directional fiber-reinforced composites will be presented. The ability of these models to give an accurate prediction of the composite thermal conductivity depends on the amount of information known about the constituent phase properties under the assumption that these properties do not change as a result of processing. Also presented are models that take into account the effects of fiber coatings.

  8. Fiber tip interferometry for non-contact ultrasonic NDE

    E-Print Network [OSTI]

    Schumacher, Neal Andrew

    1990-01-01T23:59:59.000Z

    FIBER TIP INTERFEROMETRY FOR NON-CONTACT ULTRASONIC NDE A Thesis by Neal Andrew Schumacher Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE... August 1990 Major Subject: Mechanical Engineering FIBER TIP INTERFEROMETRY FOR NON-CONTACT ULTRASONIC NDE A Thesis by Neal Andrew Schumacher Approved as to style and content by: Christian P. Burger (Chair of Committee) Hans Schuessler...

  9. Fabry-Perot fiber optic sensor using multimode laser diode

    E-Print Network [OSTI]

    Chu, Siu Yi Andrew

    1993-01-01T23:59:59.000Z

    FABRY-PEROT FIBER OPTIC SENSOR USING MULTIMODE LASER DIODE A Thesis SIU YI ANDREW CHU Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE August... 1993 Major Subject: Electrical Engineering FABRY-PEROT FIBER OPTIC SENSOR USING MULTIMODE LASER DIODE A Thesis SIU YI ANDREW CHU Submitted to Texas ARM University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE...

  10. Clad fiber capacitor and method of making same

    SciTech Connect (OSTI)

    Tuncer, Enis

    2013-11-26T23:59:59.000Z

    A clad capacitor and method of manufacture includes assembling a preform comprising a ductile, electrically conductive fiber; a ductile, electrically insulating cladding positioned on the fiber; a ductile, electrically conductive sleeve positioned over the cladding. One or more of the preforms are then bundled, heated and drawn along a longitudinal axis to decrease the diameter of the ductile components of the preform and fuse the preform into a unitized strand.

  11. Continuous fiber ceramic composites for energy related applications. Final report

    SciTech Connect (OSTI)

    NONE

    1998-04-07T23:59:59.000Z

    The US Department of Energy has established the Continuous Fiber Ceramic Composites (CFCC) program to develop technology for the manufacture of CFCC`s for use in industrial applications where a reduction in energy usage or emissions could be realized. As part of this program, the Dow Chemical Company explored the manufacture of a fiber reinforced/self reinforced silicon nitride for use in industrial chemical processing. In Dow`s program, CFCC manufacturing technology was developed around traditional, cost effective, tape casting routes. Formulations were developed and coupled with unique processing procedures which enabled the manufacture of tubular green laminates of the dimension needed for the application. An evaluation of the effect of various fibers and fiber coatings on the properties of a fiber reinforced composites was also conducted. Results indicated that fiber coatings could provide composites exhibiting non-catastrophic failure and substantially improved toughness. However, an evaluation of these materials in industrial process environments showed that the material system chosen by Dow did not provide the required performance improvements to make replacement of current metallic components with CFCC components economically viable.

  12. Surface plasmon sensing of gas phase contaminants using optical fiber.

    SciTech Connect (OSTI)

    Thornberg, Steven Michael; White, Michael I.; Rumpf, Arthur Norman; Pfeifer, Kent Bryant

    2009-10-01T23:59:59.000Z

    Fiber-optic gas phase surface plasmon resonance (SPR) detection of several contaminant gases of interest to state-of-health monitoring in high-consequence sealed systems has been demonstrated. These contaminant gases include H{sub 2}, H{sub 2}S, and moisture using a single-ended optical fiber mode. Data demonstrate that results can be obtained and sensitivity is adequate in a dosimetric mode that allows periodic monitoring of system atmospheres. Modeling studies were performed to direct the design of the sensor probe for optimized dimensions and to allow simultaneous monitoring of several constituents with a single sensor fiber. Testing of the system demonstrates the ability to detect 70mTorr partial pressures of H{sub 2} using this technique and <280 {micro}Torr partial pressures of H{sub 2}S. In addition, a multiple sensor fiber has been demonstrated that allows a single fiber to measure H{sub 2}, H{sub 2}S, and H{sub 2}O without changing the fiber or the analytical system.

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

    DOE Patents [OSTI]

    Pinkel, Daniel (Walnut Creek, CA); Gray, Joe (San Francisco, CA)

    1997-01-01T23:59:59.000Z

    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.

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

    DOE Patents [OSTI]

    Pinkel, Daniel (Walnut Creek, CA); Gray, Joe (San Francisco, CA); Albertson, Donna G. (Lafayette, CA)

    2000-01-01T23:59:59.000Z

    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.

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

    DOE Patents [OSTI]

    Pinkel, D.; Gray, J.

    1997-11-25T23:59:59.000Z

    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.

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

    DOE Patents [OSTI]

    Pinkel, Daniel (Walnut Creek, CA); Gray, Joe (San Francisco, CA); Albertson, Donna G. (Lafayette, CA)

    2002-01-01T23:59:59.000Z

    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.

  17. Polarization insensitive in-fiber mode-locker based on carbon nanotube with N-methyl-2-pryrrolidone solvent filled fiber microchamber

    E-Print Network [OSTI]

    Turitsyn, Sergei K.

    ) Theoretical study on phase locking of the array of fiber lasers coupled by bi-dimensional mutual injection AIP excitation source for coherent Raman spectroscopy based on a single fiber laser Appl. Phys. Lett. 99, 181112 locking. The proposed and demonstrated passively mode locked fiber laser shows higher energy soliton

  18. CODIFICATION OF FIBER REINFORCED COMPOSITE PIPING

    SciTech Connect (OSTI)

    Rawls, G.

    2012-10-10T23:59:59.000Z

    The goal of the overall project is to successfully adapt spoolable FRP currently used in the oil industry for use in hydrogen pipelines. The use of FRP materials for hydrogen service will rely on the demonstrated compatibility of these materials for pipeline service environments and operating conditions. The ability of the polymer piping to withstand degradation while in service, and development of the tools and data required for life management are imperative for successful implementation of these materials for hydrogen pipeline. The information and data provided in this report provides the technical basis for the codification for fiber reinforced piping (FRP) for hydrogen service. The DOE has invested in the evaluation of FRP for the delivery for gaseous hydrogen to support the development of a hydrogen infrastructure. The codification plan calls for detailed investigation of the following areas: System design and applicable codes and standards; Service degradation of FRP; Flaw tolerance and flaw detection; Integrity management plan; Leak detection and operational controls evaluation; Repair evaluation. The FRP codification process started with commercially available products that had extensive use in the oil and gas industry. These products have been evaluated to assure that sufficient structural integrity is available for a gaseous hydrogen environment.

  19. Lithium Loaded Glass Fiber Neutron Detector Tests

    SciTech Connect (OSTI)

    Ely, James H.; Erikson, Luke E.; Kouzes, Richard T.; Lintereur, Azaree T.; Stromswold, David C.

    2009-11-12T23:59:59.000Z

    Radiation portal monitors used for interdiction of illicit materials at borders include highly sensitive neutron detection systems. The main reason for having neutron detection capability is to detect fission neutrons from plutonium. The currently deployed radiation portal monitors (RPMs) from Ludlum and Science Applications International Corporation (SAIC) use neutron detectors based upon 3He-filled gas proportional counters, which are the most common large neutron detector. There is a declining supply of 3He in the world and, thus, methods to reduce the use of this gas in RPMs with minimal changes to the current system designs and sensitivity to cargo-borne neutrons are being investigated. Four technologies have been identified as being currently commercially available, potential alternative neutron detectors to replace the use of 3He in RPMs. Reported here are the results of tests of the lithium-loaded glass fibers option. This testing measured the neutron detection efficiency and gamma ray rejection capabilities of a small system manufactured by Nucsafe (Oak Ridge, TN).

  20. System to continuously produce carbon fiber via microwave assisted plasma processing

    DOE Patents [OSTI]

    White, Terry L. (Knoxville, TN) [Knoxville, TN; Paulauskas, Felix L. (Knoxville, TN) [Knoxville, TN; Bigelow, Timothy S. (Knoxville, TN) [Knoxville, TN

    2010-11-02T23:59:59.000Z

    A system to continuously produce fully carbonized or graphitized carbon fibers using microwave-assisted plasma (MAP) processing comprises an elongated chamber in which a microwave plasma is excited in a selected gas atmosphere. Fiber is drawn continuously through the chamber, entering and exiting through openings designed to minimize in-leakage of air. There is a gradient of microwave power within the chamber with generally higher power near where the fiber exits and lower power near where the fiber enters. Polyacrylonitrile (PAN), pitch, or any other suitable organic/polymeric precursor fibers can be used as a feedstock for the inventive system. Oxidized or partially oxidized PAN or pitch or other polymeric fiber precursors are run continuously through a MAP reactor in an inert, non-oxidizing atmosphere to heat the fibers, drive off the unwanted elements such as oxygen, nitrogen, and hydrogen, and produce carbon or graphite fibers faster than conventionally produced carbon fibers.

  1. Multiparameter fiber optic sensing system for monitoring enhanced geothermal systems

    SciTech Connect (OSTI)

    William A. Challener

    2014-12-04T23:59:59.000Z

    The goal of this project was to design, fabricate and test an optical fiber cable which supports multiple sensing modalities for measurements in the harsh environment of enhanced geothermal systems. To accomplish this task, optical fiber was tested at both high temperatures and strains for mechanical integrity, and in the presence of hydrogen for resistance to darkening. Both single mode (SM) and multimode (MM) commercially available optical fiber were identified and selected for the cable based on the results of these tests. The cable was designed and fabricated using a tube-within-tube construction containing two MM fibers and one SM fiber, and without supporting gel that is not suitable for high temperature environments. Commercial fiber optic sensing instruments using Raman DTS (distributed temperature sensing), Brillouin DTSS (distributed temperature and strain sensing), and Raleigh COTDR (coherent optical time domain reflectometry) were selected for field testing. A microelectromechanical systems (MEMS) pressure sensor was designed, fabricated, packaged, and calibrated for high pressure measurements at high temperatures and spliced to the cable. A fiber Bragg grating (FBG) temperature sensor was also spliced to the cable. A geothermal well was selected and its temperature and pressure were logged. The cable was then deployed in the well in two separate field tests and measurements were made on these different sensing modalities. Raman DTS measurements were found to be accurate to ���±5���°C, even with some residual hydrogen darkening. Brillouin DTSS measurements were in good agreement with the Raman results. The Rayleigh COTDR instrument was able to detect some acoustic signatures, but was generally disappointing. The FBG sensor was used to determine the effects of hydrogen darkening, but drift over time made it unreliable as a temperature or pressure sensor. The MEMS sensor was found to be highly stable and accurate to better than its 0.1% calibration.

  2. Tensile strain measurements of ceramic fibers using scanning laser acoustic microscopy

    SciTech Connect (OSTI)

    Kent, R.M.; Vary, A.

    1992-01-01T23:59:59.000Z

    A noncontacting technique using scanning laser acoustic microscopy for making in situ tensile strain measurements of small diameter fibers was implemented for the tensile strain analysis of individual Nicalon SiC fibers (nominal diameter 15 microns). Stress versus strain curves for the fibers were plotted from the experimental data. The mean elastic modulus of the fibers was determined to be 185.3 GPa. Similar measurements were made for Carborundum SiC fibers (nominal diameter 28 microns) and Saphikon sapphire fibers (nominal diameter 140 microns), yielding and elastic modulus of 401 and 466.8 GPa, respectively.

  3. Tensile strain measurements of ceramic fibers using scanning laser acoustic microscopy

    SciTech Connect (OSTI)

    Kent, R.M.; Vary, A.

    1992-08-01T23:59:59.000Z

    A noncontacting technique using scanning laser acoustic microscopy for making in situ tensile strain measurements of small diameter fibers was implemented for the tensile strain analysis of individual Nicalon SiC fibers (nominal diameter 15 microns). Stress vs strain curves for the fibers were plotted from the experimental data. The mean elastic modulus of the fibers was determined to be 185.3 GPa. Similar measurements were made for Carborundum SiC fibers (nominal diameter 28 microns) and Saphikon sapphire fibers (nominal diameter 140 microns). 8 refs.

  4. Hectospec, the MMT's 300 Optical Fiber-Fed Spectrograph

    E-Print Network [OSTI]

    Daniel Fabricant; Robert Fata; John Roll; Edward Hertz; Nelson Caldwell; Thomas Gauron; John Geary; Brian McLeod; Andrew Szentgyorgyi

    2005-08-25T23:59:59.000Z

    The Hectospec is a 300 optical fiber fed spectrograph commissioned at the MMT in the spring of 2004. A pair of high-speed six-axis robots move the 300 fiber buttons between observing configurations within ~300 s and to an accuracy ~25 microns. The optical fibers run for 26 m between the MMT's focal surface and the bench spectrograph operating at R~1000-2000. Another high dispersion bench spectrograph offering R~5,000, Hectochelle, is also available. The system throughput, including all losses in the telescope optics, fibers, and spectrograph peaks at ~10% at the grating blaze in 1" FWHM seeing. Correcting for aperture losses at the 1.5" diameter fiber entrance aperture, the system throughput peaks at $\\sim$17%. Hectospec has proven to be a workhorse instrument at the MMT. Hectospec and Hectochelle together were scheduled for 1/3 of the available nights since its commissioning. Hectospec has returned \\~60,000 reduced spectra for 16 scientific programs during its first year of operation.

  5. Optical Fiber High Temperature Sensor Instrumentation for Energy Intensive Industries

    SciTech Connect (OSTI)

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

    2006-11-14T23:59:59.000Z

    This report summarizes technical progress during the program “Optical Fiber High Temperature Sensor Instrumentation for Energy Intensive Industries”, performed by the Center for Photonics Technology of the Bradley Department of Electrical and Computer Engineering at Virginia Tech. The objective of this program was to use technology recently invented at Virginia Tech to develop and demonstrate the application of self-calibrating optical fiber temperature and pressure sensors to several key energy-intensive industries where conventional, commercially available sensors exhibit greatly abbreviated lifetimes due primarily to environmental degradation. A number of significant technologies were developed under this program, including • a laser bonded silica high temperature fiber sensor with a high temperature capability up to 700°C and a frequency response up to 150 kHz, • the world’s smallest fiber Fabry-Perot high temperature pressure sensor (125 x 20 ?m) with 700°C capability, • UV-induced intrinsic Fabry-Perot interferometric sensors for distributed measurement, • a single crystal sapphire fiber-based sensor with a temperature capability up to 1600°C. These technologies have been well demonstrated and laboratory tested. Our work plan included conducting major field tests of these technologies at EPRI, Corning, Pratt & Whitney, and Global Energy; field validation of the technology is critical to ensuring its usefulness to U.S. industries. Unfortunately, due to budget cuts, DOE was unable to follow through with its funding commitment to support Energy Efficiency Science Initiative projects and this final phase was eliminated.

  6. Sub-20-Attosecond Timing Jitter Mode-Locked Fiber Lasers

    E-Print Network [OSTI]

    Kim, Hyoji; Song, Youjian; Yang, Heewon; Shin, Junho; Kim, Chur; Jung, Kwangyun; Wang, Chingyue; Kim, Jungwon

    2014-01-01T23:59:59.000Z

    We demonstrate 14.3-attosecond timing jitter [integrated from 10 kHz to 94 MHz offset frequency] optical pulse trains from 188-MHz repetition-rate mode-locked Yb-fiber lasers. In order to minimize the timing jitter, we shorten the non-gain fiber length to shorten the pulsewidth and reduce excessive higher-order nonlinearity and nonlinear chirp in the fiber laser. The measured jitter spectrum is limited by the amplified spontaneous emission limited quantum noise in the 100 kHz - 1 MHz offset frequency range, while it was limited by the relative intensity noise-converted jitter in the lower offset frequency range. This intrinsically low timing jitter enables sub-100-attosecond synchronization between the two mode-locked Yb-fiber lasers over the full Nyquist frequency with a modest 10-kHz locking bandwidth. The demonstrated performance is the lowest timing jitter measured from any free-running mode-locked fiber lasers, comparable to the performance of the lowest-jitter Ti:sapphire solid-state lasers.

  7. Modeling and validation of performance limitations for the optimal design of interferometric and intensity-modulated fiber optic displacement sensors

    E-Print Network [OSTI]

    Moro, Erik Allan

    2012-01-01T23:59:59.000Z

    317 (1996). B. Culshaw, “Optical fiber sensor technologies:Fabry-Perot optical fiber sensors,” Opt. Lett. 16 ( 4), 273-and implementation of optical sensors for use in such

  8. The effect of fiber coating thickness on the interfacial properties of a continuous fiber ceramic matrix composite

    SciTech Connect (OSTI)

    Lara-Curzio, E.; Ferber, M.K.; Lowden, R.A.

    1994-09-01T23:59:59.000Z

    The interfacial properties (coefficient of friction, residual clamping stress, residual axial stress, and debond stress) of a continuous fiber ceramic composite were determined by means of single-fiber push-out tests. The composite consisted of Nicalon{trademark} fibers, that had been coated prior to matrix infiltration with carbon layers ranging in thickness from 0.03 to 1.2 {mu}m, and a SiC matrix. It was found that the effective interfacial frictional stress decreased as the thickness of the carbon layer increased, from 24.6 {plus_minus} 9.9 MPa for a thickness of 0.03 Jim to 5.8 {plus_minus} 1.4 MPa for a thickness of 1.25 {mu}m. It was also found that both the coefficient of friction and the residual clamping stress decreased as the thickness of the carbon layer increased. These results are explained in terms of the state of residual stresses in this composite and the role of the fiber surface topography during fiber sliding.

  9. A High Efficiency Architecture for Cascaded Raman Fiber Lasers

    E-Print Network [OSTI]

    Supradeepa, V R; Headley, Clifford E; Yan, Man F; Palsdottir, Bera; Jakobsen, Dan

    2013-01-01T23:59:59.000Z

    We demonstrate a new high efficiency architecture for cascaded Raman fiber lasers based on a single pass cascaded amplifier configuration. Conversion is seeded at all intermediate Stokes wavelengths using a multi-wavelength seed source. A lower power Raman laser based on the conventional cascaded Raman resonator architecture provides a convenient seed source providing all the necessary wavelengths simultaneously. In this work we demonstrate a 1480nm laser pumped by an 1117nm Yb-doped fiber laser with maximum output power of 204W and conversion efficiency of 65% (quantum-limited efficiency is ~75%). We believe both the output power and conversion efficiency (relative to quantum-limited efficiency) are the highest reported for Raman fiber lasers.

  10. Mid-Infrared Fiber-Coupled QCl-QEPAS Sensor

    SciTech Connect (OSTI)

    Spagnolo, V.; Patimisco, P.; Borri, Simone; Scamarcio, G.; Bernacki, Bruce E.; Kriesel, J.M.

    2013-08-01T23:59:59.000Z

    An innovative spectroscopic system based on an external cavity quantum cascade laser (EC-QCL) coupled with a mid-infrared (mid-IR) fiber and quartz enhanced photoacoustic spectroscopy (QEPAS) is described. SF6 has been selected as a target gas in demonstration of the system for trace gas sensing. Single mode laser delivery through the prongs of the quartz tuning fork has been obtained employing a hollow waveguide fiber with inner silver–silver iodine (Ag–AgI) coatings and internal core diameter of 300 lm. A detailed design and realization of the QCL fiber coupling and output collimator system allowed almost practically all (99.4 %) of the laser beam to be transmitted through the spectrophone module. The achieved sensitivity of the system is 50 parts per trillion in 1 s, corresponding to a record for QEPAS normalized noise-equivalent absorption 2.7 9 10-10 W cm-1 Hz-1/2.

  11. Thermal shock behavior of fiber-reinforced composites

    SciTech Connect (OSTI)

    Wang, H.; Singh, R.N. [Cincinnati Univ., OH (United States). Dept. of Materials Science and Engineering; Beecher, S.C.; Dinwiddie, R.B. [Oak Ridge National Lab., TN (United States)

    1995-02-01T23:59:59.000Z

    The thermal shock behavior of three types of continuous fiber-reinforced ceramic composites (Nextel{trademark} or Nicalon{trademark} fiber-reinforced chemical vapor infiltrated or polymer-derived SiC matrix composites) was studied using the water quench technique. The thermal shock induced damage was characterized by both destructive and nondestructive techniques. As compared with monolithic ceramics, the continuous fiber-reinforced ceramic composites were capable of preventing catastrophic failure caused by thermal shock and were able to retain a significant portion of their original strength at {Delta}{Tau} = 1000{degrees}C. The nondestructive techniques involved measuring the thermal diffusivity by the flash technique and determining the Young`s modulus by the dynamic resonance method. It has been demonstrated that these nondestructive techniques can detect damage induced by thermal shock and are more sensitive in detecting damage in the early stage than the conventional destructive technique of measuring the retained strength.

  12. Oxidation-resistant interfacial coatings for continuous fiber ceramic composites

    SciTech Connect (OSTI)

    Shanmugham, S.; Liaw, P.K. [Tennessee Univ., Knoxville, TN (United States); Stinton, D.P.; Bleier, A.; Besmann, T.M.; Lara-Curzio, E. [Oak Ridge National Lab., TN (United States); Rebillat, F. [LCTS, Pessac (France)

    1995-06-01T23:59:59.000Z

    Developing an oxidation-resistant interfacial coating for continuous fiber ceramic composites (CFCCs) continues to be a major challenge. CFCCs` mechanical behavior are influenced by the interfacial bonding characteristics between the fiber and the matrix. Finite element modeling studies suggest that a low-modulus interfacial coating material will be effective in reducing the residual thermal stresses that are generated upon cooling from processing temperatures. Nicalon/SiC composites with carbon, alumina and mullite interfacial coatings were fabricated with the SiC matrix deposited using a forced-flow chemical vapor infiltration process. Composites with mullite interfacial coatings exhibited considerable fiber pull-out even after oxidation and have potential as a composite system.

  13. Use of a fiber optic probe for organic species determination

    DOE Patents [OSTI]

    Ekechukwu, A.A.

    1996-12-10T23:59:59.000Z

    A fiber optic probe is described 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. 5 figs.

  14. Expanded beam non-imaging fiber optic connector

    DOE Patents [OSTI]

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

    1990-02-06T23:59:59.000Z

    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.

  15. Expanded beam non-imaging fiber optic connector

    DOE Patents [OSTI]

    Jannson, Tommasz (Redondo Beach, CA); Jannson, Joanna (Redondo Beach, CA); Yeung, Peter (Redondo Beach, CA)

    1990-01-01T23:59:59.000Z

    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 collimater 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.

  16. Composite fiber adsorbent for rapid uptake of uranyl from seawater

    SciTech Connect (OSTI)

    Kobuke, Y.; Tabushi, I.; Aoki, T.; Karnaishi, T.; Hagiwara, I.

    1988-08-01T23:59:59.000Z

    Composite fiber adsorbent was developed as a new material for the recovery of uranium from seawater. Finely powdered adsorbent was entrapped into the fibril of the supporting material such as polyethylene or a copolymer of ethylene and vinyl acetate. Silica was added as the third component. The relative ratio of chemical adsorbent, supporting material and silica was usually 1:1:1. This composite fiber adsorbent gave a large adsorption rate such as 200 ..mu..g of U/g of Ads by 1-day contact in a seawater batch test. This adsorption rate shows a dramatic improvement of the adsorption rate from the particle absorbent, illustrating the advantageous use of fiber adsorbent for the recovery of uranium.

  17. Double filaments in fibers and crystals of deoxygenated hemoglobin S

    SciTech Connect (OSTI)

    Magdoff-Fairchild, B.; Chiu, C.C.

    1980-10-01T23:59:59.000Z

    Sickle cell hemoglobin (HbS) molecules in solution or in SS erythrocytes (those from individuals homozygous for the sickle hemoglobin gene), when deoxygenated, aggregate to form fibers that pack into paracrystalline arrays. The diminished oxygen affinity of HbS is produced by the polymerization, and the distortion of the pliant erythrocyte membrane is produced by the polymerization, and the distortion of the pliant erythrocyte membrane in sickle cell disease results from the elongation of polymers and their subsequent alignment. One of the important problems to be solved in sickle cell disease is the definition of the intermolecular interactions that stabilize the fiber structure. Knowledge of these interactions might lead to the design of stereospecific antisickling agents for clinical use that could inhibit polymerization or could at least destabilize the fiber.

  18. New Manufacturing Method for Paper filler and Fiber Material

    SciTech Connect (OSTI)

    Doelle, Klaus

    2011-11-22T23:59:59.000Z

    The study compares commercial available filler products with a new developed â??Hybrid Fiber Filler Composite Materialâ?ť and how main structural, optical and strength properties are affected by increasing the filler content of at least 5% over commercial values. The study consists of: (i) an overview of paper filler materials used in the paper production process, (ii) discusses the manufacturing technology of lime based filler materials for paper applications, (iii) gives an overview of new emerging paper filler technologies, (iv) discusses a filler evaluation of commercial available digital printing paper products, (v) reports from a detailed handsheet study and 12â?ť pilot plant paper machine trial runs with the new Hybrid Fiber Filler Composite Material, and (vi) evaluates and compares commercial filler products and the new Hybrid Fiber Filler Composite Material with a life cycle analyses that explains manufacturing, economic and environmental benefits as they are applied to uncoated digital printing papers.

  19. Superconductor fiber elongation with a heated injected gas

    DOE Patents [OSTI]

    Zeigler, Douglas D. (Atwater, OH); Conrad, Barry L. (Alliance, OH); Gleixner, Richard A. (North Canton, OH)

    2001-01-16T23:59:59.000Z

    An improved method and apparatus for producing flexible fibers (30) of superconducting material includes a crucible (12) for containing a charge of the superconducting material. The material is melted in the crucible (12) and falls in a stream (18) through a bottom hole (16) in the crucible (12). The stream (18) falls through a protecting collar (22) which maintains the stream (18) at high temperatures. The stream (18) is then supplied through a downwardly directed nozzle (26) where it is subjected to a high velocity of a heated gas (36') which breaks the melted superconducting material into ligaments which solidify into the flexible fibers (30). The fibers (30) are collected by directing them against a collection filter (32).

  20. A Viscoelastic-Viscoplastic Analysis of Fiber Reinforced Polymer Composites Undergoing Mechanical Loading and Temperature Changes 

    E-Print Network [OSTI]

    Jeon, Jaehyeuk

    2013-08-09T23:59:59.000Z

    This study presents a combined viscoelastic (VE)-viscoplastic (VP) analysis for Fiber Reinforced Polymer (FRP) composites subject to simultaneous mechanical load and conduction of heat. The studied FRP composites consist of unidirectional fibers...

  1. PURDUE UNIVERSITY ULTRAFAST OPTICS AND OPTICAL FIBER COMMUNICATIONS LABORATORY Femtosecond Pulse

    E-Print Network [OSTI]

    Purdue University

    as new pulse sequence processing functionalities. #12;PURDUE UNIVERSITY ULTRAFAST OPTICS AND OPTICAL UNIVERSITY ULTRAFAST OPTICS AND OPTICAL FIBER COMMUNICATIONS LABORATORY CLEO 2002 One Guide ­ One PulsePURDUE UNIVERSITY ULTRAFAST OPTICS AND OPTICAL FIBER COMMUNICATIONS LABORATORY CLEO 2002

  2. Carbon nanotube growth on challenging substrates : applications for carbon-fiber composites

    E-Print Network [OSTI]

    Steiner, Stephen Alan, III

    2012-01-01T23:59:59.000Z

    Nanoengineered hierarchal fiber architectures are promising approaches towards improving the inter- and intralaminar mechanical properties (e.g., toughness and strength) and non-mechanical properties of advanced fiber-reinforced ...

  3. Morphology and mechanical properties of electrospun polymeric fibers and their nonwoven fabrics

    E-Print Network [OSTI]

    Pai, Chia-Ling

    2011-01-01T23:59:59.000Z

    Electrospinning is a straight forward method to produce fibers with diameter on the order of a few tens of nanometers to the size approaching commercial fibers (on the order of 10 prm or larger). Recently, the length scale ...

  4. Tunable micro-cavities in photonic band-gap yarns and optical fibers

    E-Print Network [OSTI]

    Benoit, Gilles, Ph. D. Massachusetts Institute of Technology

    2006-01-01T23:59:59.000Z

    The vision behind this work is the fabrication of high performance innovative fiber-based optical components over kilometer length-scales. The optical properties of these fibers derive from their multilayer dielectric ...

  5. A Multi-scale Framework for Thermo-viscoelastic Analysis of Fiber Metal Laminates

    E-Print Network [OSTI]

    Sawant, Sourabh P.

    2010-01-14T23:59:59.000Z

    Fiber Metal Laminates (FML) are hybrid composites with alternate layers of orthotropic fiber reinforced polymers (FRP) and isotropic metal alloys. FML can exhibit a nonlinear thermo-viscoelastic behavior under the influence of external mechanical...

  6. A Viscoelastic-Viscoplastic Analysis of Fiber Reinforced Polymer Composites Undergoing Mechanical Loading and Temperature Changes

    E-Print Network [OSTI]

    Jeon, Jaehyeuk

    2013-08-09T23:59:59.000Z

    of thermal stresses, due to the mismatches in the coefficient of thermal expansions of the fibers and polymeric matrix, and stress concentrations/discontinuities near the fiber and matrix interfaces on the overall thermo-mechanical deformation of FRP...

  7. Lorentz force actuator and carbon fiber co-winding design, construction and characterization

    E-Print Network [OSTI]

    Chen, Yi, S. B. Massachusetts Institute of Technology

    2008-01-01T23:59:59.000Z

    Carbon fiber composites are materials that present many benefits to engineering applications, ranging from aerospace to medicine. This thesis provides background on carbon fiber properties and manufacturing techniques, and ...

  8. Personnel Grounding and Safety: Issues and Solutions Related to Servicing Optical Fiber

    E-Print Network [OSTI]

    Personnel Grounding and Safety: Issues and Solutions Related to Servicing Optical Fiber Telecommunication Circuits in Optical Ground Wire (OPGW) Final Project Report Power Systems Engineering Research to Servicing Optical Fiber Telecommunication Circuits in Optical Ground Wire (OPGW) Final Project Report

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

    Energy Savers [EERE]

    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,...

  10. Ultrafast Optics and Optical Fiber Communications Laboratory http://purcell.ecn.purdue.edu/~fsoptics/

    E-Print Network [OSTI]

    Purdue University

    Ultrafast Optics and Optical Fiber Communications Laboratory http, A. M. Weiner Purdue University C. Lin Avanex Corporation Conference on Lasers and Electro Optics;Ultrafast Optics and Optical Fiber Communications Laboratory http://purcell.ecn.purdue.edu/~fsoptics/ 2

  11. PURDUE UNIVERSITY ULTRAFAST OPTICS & OPTICAL FIBER COMMUNICATIONS LABORATORY Photonic RF Waveform Synthesis,

    E-Print Network [OSTI]

    Purdue University

    PURDUE UNIVERSITY ULTRAFAST OPTICS & OPTICAL FIBER COMMUNICATIONS LABORATORY Photonic RF Waveform, Shijun Xiao Funding from ARO, DARPA, and NSF #12;PURDUE UNIVERSITY ULTRAFAST OPTICS & OPTICAL FIBER performance (spectral engineering, dispersion compensation) #12;PURDUE UNIVERSITY ULTRAFAST OPTICS & OPTICAL

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

    E-Print Network [OSTI]

    Kuppuswamy, Harini

    2006-04-12T23:59:59.000Z

    laser emitting single longitudinal mode light and exhibiting low frequency drift are passed through one end of the buried fiber. The backscattered light emerging from the same fiber end was monitored using a photodetector. The phase changes produced...

  13. Design and implementation of a fiber optic doppler optical coherence microscopy system for cochlear imaging

    E-Print Network [OSTI]

    Williams, Logan P

    2014-01-01T23:59:59.000Z

    In this thesis, the design and implementation of a fiber optic Doppler optical coherence microscopy (FO-DOCM) system for cochlear imaging applications is presented. The use of a fiber optic design significantly reduces ...

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

    E-Print Network [OSTI]

    Bae, Taehan

    2001-01-01T23:59:59.000Z

    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...

  15. Design and measurements of novel electromagnetic properties in spiral transmission fibers

    E-Print Network [OSTI]

    Shemuly, Dana

    2012-01-01T23:59:59.000Z

    One dimensional photonic band gap fibers have proven to be fascinating and versatile devices, as demonstrated by many applications. The ability to control and design these fibers to achieve specific functionalities will ...

  16. A line-of-sight voice communication system with optoelectric fibers

    E-Print Network [OSTI]

    Yang, Paul L

    2009-01-01T23:59:59.000Z

    Recently developed multi-material optoelectric fibers have showed great potential for use as photodetectors [1]. Such light-sensitive fibers are flexible and can be weaved through clothing with a seamless interface. Our ...

  17. An instrument for high-throughput measurements of fiber mechanical properties

    E-Print Network [OSTI]

    Kristofek, Grant William, 1980-

    2005-01-01T23:59:59.000Z

    In this thesis, an instrument is designed and constructed for the purpose of measuring the mechanical properties of single fibers. The instrument is intended to provide high throughput measurement of single fiber geometric ...

  18. White light Bessel-like beams generated by miniature all-fiber device

    E-Print Network [OSTI]

    Kieu, Khanh

    (15), 1696­1698 (2008). 5. Y. Matsuoka, Y. Kizuka, and T. Inoue, "The characteristics of laser micro drilling: (140.3330) Laser beam shaping; (060.2310) Fiber optics; (230.2285) Fiber devices and optical amplifiers

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

    DOE Patents [OSTI]

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

    1993-01-01T23:59:59.000Z

    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.

  20. Complete Fiber/Copper Cable Solution for Long-Term Temperature...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Complete FiberCopper Cable Solution for Long-Term Temperature and Pressure Measurement in Supercritical Reservoirs and EGS Wells Complete FiberCopper Cable Solution for Long-Term...

  1. Genetic Improvement of Upper Half Mean Length and Short Fiber Content in Upland Cotton, Gosspium hirsutum

    E-Print Network [OSTI]

    Beyer, Benjamin

    2012-10-19T23:59:59.000Z

    the cultivar, environmental conditions during the growing season, harvest methods, and ginning methods (Anthony, 1999). While improvements have been made in the way cotton is handled from harvesting to ginning, genetic improvement of fiber quality... development, potential cultivars should be tested for adaptation prior to adoption by producers in order to determine the potential for fiber quality. Fiber Quality Cotton fiber quality is at its peak when the bolls are still on the plant (Anthony, 1994...

  2. Anisotropy in Sickle Hemoglobin Fibers from Variations in Bending and Twist

    E-Print Network [OSTI]

    Turner, Matthew

    is a primary cause of sickle cell anemia. The symptoms of the disease arise because cells contain- ing fibers

  3. Imaging Fiber Options for the Merit Experiment T. Tsang, BNL 21 Feb 2006

    E-Print Network [OSTI]

    McDonald, Kirk

    .8k$10.3kTotal cost for 4 fibers (40 meter) $10065$5214$2574Cost in 10 meter $305$158$78Cost per foot Fujikura data, FIGH-30 A continuous 20-meter fiber 30,000 pixel imaging fiber $33k $8250 $250 $71.8k$11.2k Total cost for 4 fibers (40 meter) $17.8k$2805Cost in 10 meter $540$85Cost per foot unofficial price

  4. Scale Up of Novel, Low-Cost Carbon Fibers Leading to High-Volume...

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

    low-costcarbonfibersfactsheet.pdf More Documents & Publications CX-009154: Categorical Exclusion Determination Lower Cost Carbon Fiber Precursors Development and...

  5. Highly tunable large-core single-mode liquid-crystal photonic bandgap fiber

    E-Print Network [OSTI]

    Wu, Shin-Tson

    the possibility of infusing liquids into the fiber and this has opened up the possibility of creating tunable

  6. Hybrid core carbon fiber composite sandwich panels: Fabrication and mechanical response

    E-Print Network [OSTI]

    Wadley, Haydn

    a carbon fiber braided net, 3D woven face sheets and various polymeric foams, and infused with an epoxy

  7. Optical fiber configurations for transmission of laser energy over great distances

    DOE Patents [OSTI]

    Rinzler, Charles C; Zediker, Mark S

    2013-10-29T23:59:59.000Z

    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.

  8. Optical fiber configurations for transmission of laser energy over great distances

    DOE Patents [OSTI]

    Rinzler, Charles C; Zediker, Mark S

    2014-11-04T23:59:59.000Z

    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.

  9. Ship Effect Measurements With Fiber Optic Neutron Detector

    SciTech Connect (OSTI)

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

    2010-08-10T23:59:59.000Z

    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.

  10. Wavelength meter having single mode fiber optics multiplexed inputs

    DOE Patents [OSTI]

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

    1993-01-01T23:59:59.000Z

    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.

  11. Fiber-optic Fabry-Perot ultrasound sensor

    E-Print Network [OSTI]

    Alcoz, Jorge Jose

    1989-01-01T23:59:59.000Z

    -Perot interferometer. A mirror is produced by joining a fiber coated on the end with a T;02 film to an uncoated fiber by electric arc splicing. The acoustic field changes the index of refraction inside the interferometer cavity through the strain optic effect, thus... displays of-the response of S2 to a 150 KHz wave, for the static phase shift changing x/2. A second harmonic is ge~ when the interferometer is in quadrature . 10. Oscilloscope displays of detected signal for the same 350 KHz acoustic wave a...

  12. Process for preparing multilayer enzyme coating on a fiber

    DOE Patents [OSTI]

    Kim, Jungbae (Richland, WA); Kwak, Ja Hun (Richland, WA); Grate, Jay W. (West Richland, WA)

    2009-11-03T23:59:59.000Z

    A process for preparing high stability, high activity biocatalytic materials is disclosed and processes for using the same. The process involves coating of a material or fiber with enzymes and enzyme aggregate providing a material or fiber with high biocatalytic activity and stability useful in heterogeneous environments. In one illustrative approach, enzyme "seeds" are covalently attached to polymer nanofibers followed by treatment with a reagent that crosslinks additional enzyme molecules to the seed enzymes forming enzyme aggregates thereby improving biocatalytic activity due to increased enzyme loading and enzyme stability. This approach creates a useful new biocatalytic immobilized enzyme system with potential applications in bioconversion, bioremediation, biosensors, and biofuel cells.

  13. Wavelength meter having single mode fiber optics multiplexed inputs

    DOE Patents [OSTI]

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

    1993-02-23T23:59:59.000Z

    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.

  14. Raman-induced limits to efficient squeezing in optical fibers

    E-Print Network [OSTI]

    Ruifang Dong; Joel Heersink; Joel F. Corney; Peter D. Drummond; Ulrik L. Andersen; Gerd Leuchs

    2007-09-14T23:59:59.000Z

    We report new experiments on polarization squeezing using ultrashort photonic pulses in a single pass of a birefringent fiber. We measure what is to our knowledge a record squeezing of -6.8 +/- 0.3 dB in optical fibers which when corrected for linear losses is -10.4 +/- 0.8 dB. The measured polarization squeezing as a function of optical pulse energy, which spans a wide range from 3.5-178.8 pJ, shows a very good agreement with the quantum simulations and for the first time we see the experimental proof that Raman effects limit and reduce squeezing at high pulse energy.

  15. Airborne asbestos fiber evaluation: a comparison of three methods

    E-Print Network [OSTI]

    Studinka, Emil

    1979-01-01T23:59:59.000Z

    AIRBORNE ASBFSTOS FIBER EVALUATION-A CONPARISON OF TliR'E NETHODS A Thesis EYiIL STUDINKA Submitted to the Graduate Co'ilege of Texas ALN University in partial fulfillment of the requirement for the degree of HASTER OF SCIEtiCE December 1979... Najor Subject: Industrial Hygiene AIRBORNE ASBESTOS FIBER EVALUATION-A COMPARISON OF THRFE METHODS A Thesis by EMIL STUDI NKA Approved as to style and content by: ichard B. onzen air ar, of Committee) llaymon L. Johnston (Member) hlilliam P...

  16. The morphological and chemical characteristics of respirable mineral wool fibers

    E-Print Network [OSTI]

    Butler, Donnie Ray

    1976-01-01T23:59:59.000Z

    in these are rockwool, slagwool and fibrous glass, any one of wh1ch may be processed from a molten state into a fluffy, lightweight mass of fine, intermingled mineral fibers composed of complex sil1cates. Each of these f1bers may have quite different physical... the United States, I In the early product1on of man-made slag fibers a stream of high pressure steam was aimed at molten slag flowing from a blast furnace, The wool produced was used ma1nly in the makinq of mortar as its value as an insulat1on material...

  17. Evaluation of the performance of polypropylene fibers on soil stabilization 

    E-Print Network [OSTI]

    Sangineni, Srinivas Meherji

    1992-01-01T23:59:59.000Z

    , Chattanooga, TN 37416. Its product name is "Fibergrids". These are one inch long 1000 denier fibers having a specific gravity of 0. 91. Sand (SM) was stabilized with type I portland cement and clay (CL) was stabilized with lime. Moisture-Density tests... and triaxial testing at a low confining pressure of 5 psi was performed for non-fibrous and fiber-filled soil cement and soil lime mixtures and the virgin soils. Stress-strain plots from the triaxial testing were used to compare the mixture properties. A...

  18. ORIGINAL PAPER Natural Fiber Reinforced Poly(vinyl chloride) Composites: Effect

    E-Print Network [OSTI]

    ORIGINAL PAPER Natural Fiber Reinforced Poly(vinyl chloride) Composites: Effect of Fiber Type Science+Business Media, LLC 2008 Abstract Poly(vinyl chloride) (PVC) and natural fiber composites were copolymer on composite properties was investigated. Mechanical analysis showed that storage modulus

  19. Construction of a 1014.8nm fiber amplifier for quadrupling into the UV 

    E-Print Network [OSTI]

    Giuoco, Frank Joseph

    2004-09-30T23:59:59.000Z

    A fiber amplifier is constructed at 1014.8nm and then frequency doubled to produce 507.4nm. This could then be frequency doubled again to produce 253.7 radiation. The fiber amplifier consists of Ytterbium doped double-clad fiber cooled to low...

  20. TESLA Report No. 2000-26 September 2000 Fiber Optic Radiation Sensing Systems

    E-Print Network [OSTI]

    TESLA Report No. 2000-26 September 2000 Fiber Optic Radiation Sensing Systems for TESLA by H, Germany F. Wulf Hahn-Meitner-Institut HMI, Germany #12;Fiber Optic Radiation Sensing Systems for TESLA of refractive index at high radiation doses 4 3. Fiber optic dosimeter types for different TESLA sections 4 3

  1. Organic Transistors on Fiber: A first step towards electronic textiles Josephine B. Lee and Vivek Subramanian

    E-Print Network [OSTI]

    California at Irvine, University of

    incorporation of interconnects into the fiber eliminates the need for switching back and forth from fiber, source/drain top contacts were patterned using orthogonal over-woven 50 µm diameter wires (Fig 1, top source/drain contact pads. Figure 1: (top) Masking process used to fabricate transistors on fiber

  2. Guided-mode based Faraday rotation spectroscopy within a photonic bandgap fiber

    E-Print Network [OSTI]

    gaseous medium within a hollow-core photonic bandgap fiber (HC-PCF). This novel fiber-optic approach to Faraday Rotation Spectroscopy (FRS) demonstrates the detection of molecular oxygen at 762.309 nm with nano reference gas cells1 . For example, hollow-core photonic bandgap fibers (HC-PCF's) enable efficient

  3. Construction of a 1014.8nm fiber amplifier for quadrupling into the UV

    E-Print Network [OSTI]

    Giuoco, Frank Joseph

    2004-09-30T23:59:59.000Z

    A fiber amplifier is constructed at 1014.8nm and then frequency doubled to produce 507.4nm. This could then be frequency doubled again to produce 253.7 radiation. The fiber amplifier consists of Ytterbium doped double-clad fiber cooled to low...

  4. Oxidation of carbon fiber surfaces for use as reinforcement in high-temperature cementitious material systems

    DOE Patents [OSTI]

    Sugama, Toshifumi (Mastic Beach, NY)

    1990-01-01T23:59:59.000Z

    The interfacial bond characteristics between carbon fiber and a cement matrix, in high temperature fiber-reinforced cementitious composite systems, can be improved by the oxidative treatment of the fiber surfaces. Compositions and the process for producing the compositions are disclosed.

  5. Adhesion and Anisotropic Friction Enhancements of Angled Heterogeneous Micro-Fiber Arrays with

    E-Print Network [OSTI]

    Goldstein, Seth Copen

    in a synthetic dry angled fibrillar adhesive sample (spatula tip fiber sample). The direction dependent frictionAdhesion and Anisotropic Friction Enhancements of Angled Heterogeneous Micro-Fiber Arrays and spatula shaped tips via dipping. These fibers are characterized for adhesion and friction and compared

  6. The Food and Fiber System and Production Agriculture's Contributions to the Texas Economy

    E-Print Network [OSTI]

    The Food and Fiber System and Production Agriculture's Contributions to the Texas Economy contributing to the state's economy. The food and fiber system in Texas is evolving and changing. The structure in state and local economies. Of particular interest is the relationship between the food and fiber system

  7. Nanomechanical displacement detection using fiber-optic interferometry N. O. Azak, M. Y. Shagam,a

    E-Print Network [OSTI]

    Nanomechanical displacement detection using fiber-optic interferometry N. O. Azak, M. Y. Shagam,a D describe a fiber-optic interferometer to detect the motion of nanomechanical resonators. In this system, the primary technical challenge of aligning the fiber-optic probe to nanometer-scale resonators is overcome

  8. Environmental temperature sensing using Raman spectra DTS fiber-optic methods

    E-Print Network [OSTI]

    Selker, John

    Environmental temperature sensing using Raman spectra DTS fiber-optic methods Scott W. Tyler,1 John January 2009. [1] Raman spectra distributed temperature sensing (DTS) by fiber-optic cables has recently sensing using Raman spectra DTS fiber-optic methods, Water Resour. Res., 45, W00D23, doi:10.1029/2008WR

  9. Distributed fiber-optic temperature sensing for hydrologic systems John S. Selker,1,2

    E-Print Network [OSTI]

    Selker, John

    Distributed fiber-optic temperature sensing for hydrologic systems John S. Selker,1,2 Luc The; accepted 27 October 2006; published 6 December 2006. [1] Instruments for distributed fiber-optic m with temporal resolution of fractions of a minute along standard fiber-optic cables used

  10. Ionic effects on silica optical fiber strength and models for fatigue V. V. Rondinella

    E-Print Network [OSTI]

    Matthewson, M. John

    Ionic effects on silica optical fiber strength and models for fatigue V. V. Rondinella M. J. Matthewson Rutgers University, Fiber Optic Materials Research Program P. 0. Box 909, Piscataway, NJ 08855, flaw free silica optical fiber shows significant differences from the bulk material for poorly

  11. 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

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

    E-Print Network [OSTI]

    Gopalan, Venkatraman

    Integrated Optoelectronics in an Optical Fiber J. V. Badding*a,d , P. J. Saziob , V. Gopalanc.d , A Integration of semiconductor and metal structures into optical fibers to enable fusion of semiconductor optoelectronic function with glass optical fibers is discussed. A chemical vapor deposition (CVD)-like process

  13. The Fiber Optic Multiplexed Thomson Scattering Diagnostic for the ETE Tokamak

    E-Print Network [OSTI]

    The Fiber Optic Multiplexed Thomson Scattering Diagnostic for the ETE Tokamak M. P. Alonso1 , L. A system and the details of the proposed multiplexed Thomson scattering diagnostic based on a fiber optic-lengths optical fibers to relay the light signals to the same polychromator [4]. The proposed system uses large

  14. Optical fiber reliability implications of uncertainty in the fatigue crack growth model

    E-Print Network [OSTI]

    Matthewson, M. John

    Optical fiber reliability implications of uncertainty in the fatigue crack growth model G. M. Bubel University Fiber Optic Materials Research Program Ceramic Science and Engineering P.O. Box 909 Piscataway, furthermore, that such flaws can grow in time so that an initially intact silica optical fiber may undergo

  15. Surface-Enhanced Resonance Raman Scattering (SERRS) Using Au Nanohole Arrays on Optical Fiber Tips

    E-Print Network [OSTI]

    Brolo, Alexandre G.

    Surface-Enhanced Resonance Raman Scattering (SERRS) Using Au Nanohole Arrays on Optical Fiber Tips nanoholes arrays were fabricated on gold films deposited on the tips of single- mode optical fibers. The optical fiber devices were used for surface- enhanced resonance Raman scattering (SERRS) measurements

  16. CONTRIBUTED ARTICLE 117. Use of in situ Fiber-Optic Raman Spectroscopy to Replace

    E-Print Network [OSTI]

    Myrick, Michael Lenn

    CONTRIBUTED ARTICLE 117. Use of in situ Fiber-Optic Raman Spectroscopy to Replace Calorimetry. Abstract A method for real time determination of the percent cure of epoxies via in-situ fiber-optic Raman to be reliable to +/- 0.82% in the 40-90% cure range. Key words: Process monitoring, fiber optic, Raman

  17. Photoluminescence measurements of quantum-dot-containing semiconductor microdisk resonators using optical fiber taper waveguides

    E-Print Network [OSTI]

    New Mexico, University of

    optical fiber taper waveguides Kartik Srinivasan,1, * Andreas Stintz,2 Sanjay Krishna,2 and Oskar Painter1 November 2005 Optical fiber taper waveguides are used to improve the efficiency of room temperature. As a near-field collection optic, the fiber taper improves the collection efficiency from microdisk lasers

  18. Chemical concentration measurement in blood serum and urine samples using liquid-core optical fiber Raman

    E-Print Network [OSTI]

    Berger, Andrew J.

    Chemical concentration measurement in blood serum and urine samples using liquid-core optical fiber in clinical blood serum and urine samples using liquid-core optical fiber (LCOF) Raman spectroscopy-core optical fiber (LCOF) geome- try can enhance the collected Raman signal from nonturbid aqueous samples by 1

  19. Effects of silica nanoparticle addition to the secondary coating of dual-coated optical fibers

    E-Print Network [OSTI]

    Matthewson, M. John

    Effects of silica nanoparticle addition to the secondary coating of dual-coated optical fibers J Available online 30 March 2006 Abstract The mechanical and optical properties of dual-coated optical fibers of silica nanoparticles in the secondary coating is shown to enhance the resistance of optical fibers

  20. Fiber-Optic Stethoscope: A Cardiac Monitoring and Gating System for Magnetic Resonance Microscopy

    E-Print Network [OSTI]

    Fiber-Optic Stethoscope: A Cardiac Monitoring and Gating System for Magnetic Resonance Microscopy monitoring and gating purposes. The fiber-optic stethoscope system offers a novel approach to measuring cardiac activity that, unlike the ECG, is immune to electromagnetic effects. The fiber-optic stethoscope

  1. PHYSICAL REVIEW A 82, 023820 (2010) Autoresonant four-wave mixing in optical fibers

    E-Print Network [OSTI]

    Friedland, Lazar

    2010-01-01T23:59:59.000Z

    PHYSICAL REVIEW A 82, 023820 (2010) Autoresonant four-wave mixing in optical fibers O. Yaakobi in optics, particularly in fiber optics [3,4]. Satisfaction of a resonance (phase matching) condition May 2010; published 30 August 2010) A theory of autoresonant four-wave mixing in tapered fibers

  2. Correction method for absorption-dependent signal enhancement by a liquid-core optical fiber

    E-Print Network [OSTI]

    Berger, Andrew J.

    Correction method for absorption-dependent signal enhancement by a liquid-core optical fiber Dahu-core optical fiber (LCOF) geometry is absorption dependent. This dependence leads to a disruption of the usual refractive index, a liquid-core optical fiber (LCOF) is formed. Light rays within the critical angle can

  3. Encoded Fiber-Optic Microsphere Arrays for Probing ProteinCarbohydrate Interactions**

    E-Print Network [OSTI]

    Ratner, Daniel M.

    Biosensors Encoded Fiber-Optic Microsphere Arrays for Probing Protein­Carbohydrate Interactions detection). Herein we describe the use of fiber-optic microsphere arrays equipped with covalently immobilized synthetic oligosaccharides for the rapid analysis of protein­carbohydrate interactions. Fiber-optic

  4. Effect of chemical stripping on the strength and surface morphology of fused silica optical fiber

    E-Print Network [OSTI]

    Matthewson, M. John

    Effect of chemical stripping on the strength and surface morphology of fused silica optical fiber V. V. Rondinella M. J. Matthewson Fiber Optic Materials Research Program Department of Ceramics Rutgers University, Piscataway, NJ 08855-0909 ABSTRACT Examination of the surface profile of silica optical fiber

  5. Silicon-doped boron nitride coated fibers in silicon melt infiltrated composites

    DOE Patents [OSTI]

    Corman, Gregory Scot (Ballston Lake, NY); Luthra, Krishan Lal (Schenectady, NY)

    1999-01-01T23:59:59.000Z

    A fiber-reinforced silicon--silicon carbide matrix composite having improved oxidation resistance at high temperatures in dry or water-containing environments is produced. The invention also provides a method for protecting the reinforcing fibers in the silicon--silicon carbide matrix composites by coating the fibers with a silicon-doped boron nitride coating.

  6. Silicon-doped boron nitride coated fibers in silicon melt infiltrated composites

    DOE Patents [OSTI]

    Corman, Gregory Scot (Ballston Lake, NY); Luthra, Krishan Lal (Schenectady, NY)

    2002-01-01T23:59:59.000Z

    A fiber-reinforced silicon-silicon carbide matrix composite having improved oxidation resistance at high temperatures in dry or water-containing environments is produced. The invention also provides a method for protecting the reinforcing fibers in the silicon-silicon carbide matrix composites by coating the fibers with a silicon-doped boron nitride coating.

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

    E-Print Network [OSTI]

    Savage, Shelby Jay, 1978-

    2007-01-01T23:59:59.000Z

    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 ...

  8. 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

  9. Structural Detuning of Pump Absorption Rate in Doped Fiber for the Enhancement of Power Conversion Efficiency

    E-Print Network [OSTI]

    Park, Namkyoo

    Structural Detuning of Pump Absorption Rate in Doped Fiber for the Enhancement of Power Conversion Doped Fiber Amplifier. With proper adjustments on doping profiles for the reduction of pump absorption rate, it becomes possible to optimize pump evolution map inside the doped fiber to get better power

  10. Infrared-to-blue frequency upconversion in a Pr3 -doped silicate fiber

    E-Print Network [OSTI]

    Infrared-to-blue frequency upconversion in a Pr3 -doped silicate fiber L. H. Acioli, A. S. L. Gomes by energy transfer between a pair of Pr3 ions in a silicate fiber. Emission in the blue and red regions that are characteristic of silicate fibers. In particular the red emission could be observed by the naked eye possibly due

  11. Oxidation of carbon fiber surfaces for use as reinforcement in high-temperature cementitious material systems

    DOE Patents [OSTI]

    Sugama, Toshifumi.

    1990-05-22T23:59:59.000Z

    The interfacial bond characteristics between carbon fiber and a cement matrix, in high temperature fiber-reinforced cementitious composite systems, can be improved by the oxidative treatment of the fiber surfaces. Compositions and the process for producing the compositions are disclosed. 2 figs.

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

    E-Print Network [OSTI]

    Theodorakis, Emmanuel

    Optical fiber-based fluorescent viscosity sensor Mark A. Haidekker and Walter J. Akers Department to molecular rotors in solution. An optical fiber-based fluorescent vis- cosity sensor may be used in real, we sought to develop an optical fiber-based sensor that could re- port changes in fluid viscosity

  13. Simulation, implementation, and analysis of an optical fiber bundle distance sensor with

    E-Print Network [OSTI]

    Huang, Haiying

    Simulation, implementation, and analysis of an optical fiber bundle distance sensor with single Optical Society of America OCIS codes: 060.2370, 120.2830. 1. Introduction Optical fiber distance sensors. In general, optical fiber distance sensors can be divided into two categories: intensity

  14. 123BLPCn272october/november 2008 Optical fiber strain sensors

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    123BLPC·n°272·october/november 2008 Optical fiber strain sensors for use in civil engineering: State-of-the-art, industrial applications and outlook ABSTRACT Optical fiber sensors prove-of-the-art assessment of optical fiber strain sensor use in civil engineering, nearly 20 years after their initial

  15. Fiber optics sensor for sub-nanometric displacement and wide bandwidth systems

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    1 Fiber optics sensor for sub-nanometric displacement and wide bandwidth systems L. Perret, L. Ruaux, B. Cagneau, Y. Alayli, Fiber optics sensor for sub-nanometric displacement and wide bandwidth systems, Sensors and Actuators A Abstract , 165, 189-193 (2011). In this paper, we report fiber optics

  16. USE OF DISTRIBUTED FIBER OPTIC SENSORS TO DETECT DAMAGE IN A Xavier Chapeleau

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    USE OF DISTRIBUTED FIBER OPTIC SENSORS TO DETECT DAMAGE IN A PAVEMENT Xavier Chapeleau 1 , Juliette strains and crack initiation. These first tests demonstrate that distributed fiber optic sensor based, by monitoring strain profiles in the bituminous layers. KEYWORDS: Distributed fiber optic sensor, asphalt

  17. Scalable Brain Network Construction on White Matter Fibers Moo K. Chung1,3,6

    E-Print Network [OSTI]

    Chung, Moo K.

    of white matter fibers are connected so we are actually dealing with paired point cloud data. SoScalable Brain Network Construction on White Matter Fibers Moo K. Chung1,3,6 , Nagesh Adluru3 to characterize the structural connectivity of the human brain non-invasively by tracing white matter fiber tracts

  18. Secure key generation using an ultra-long fiber laser: transient analysis and experiment

    E-Print Network [OSTI]

    Zadok, Avinoam

    Secure key generation using an ultra-long fiber laser: transient analysis and experiment Avi Zadok-optic components. In our Ultra-long Fiber Laser (UFL) system, each user places a randomly chosen, spectrally, based on establishing laser oscillation between two parties, which is realized using standard fiber

  19. Numerical modeling of fiber lasers with long and ultra-long ring cavity

    E-Print Network [OSTI]

    Turitsyn, Sergei K.

    Numerical modeling of fiber lasers with long and ultra-long ring cavity I.A. Yarutkina,1,2, O. S. Kobtsev, S. Kukarin, and Y. Fedotov, "Ultra-low repetition rate mode-locked fiber laser with high highlight two important aspects related to a mathematical modeling of pulsed fiber lasers with long

  20. Hierarchical Representation of Videos with Spatio-Temporal Fibers Ratnesh Kumar Guillaume Charpiat Monique Thonnat

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Hierarchical Representation of Videos with Spatio-Temporal Fibers Ratnesh Kumar Guillaume Charpiat representation of videos, as spatio- temporal fibers. These fibers are clusters of trajectories that are meshed spatially in the image domain. They form a hier- archical partition of the video into regions