Optical emission line monitor with background observation and cancellation

Title: Optical emission line monitor with background observation and cancellation

Full Record
Other Related Research

Abstract

A fiber optics based optical emission line monitoring system is provided in which selected spectral emission lines, such as the sodium D-line emission in coal combustion, may be detected in the presence of interferring background or blackbody radiation with emissions much greater in intensity than that of the emission line being detected. A bifurcated fiber optic light guide is adapted at the end of one branch to view the combustion light which is guided to a first bandpass filter, adapted to the common trunk end of the fiber. A portion of the light is reflected back through the common trunk portion of the fiber to a second bandpass filter adapted to the end of the other branch of the fiber. The first filter bandpass is centered at a wavelength corresponding to the emission line to be detected with a bandwidth of about three nanometers (nm). The second filter is centered at the same wavelength but having a width of about 10 nm. First and second light detectors are located to view the light passing through the first and second filters respectively. Thus, the second detector is blind to the light corresponding to the emission line of interest detected by themore »« less

Inventors:

Goff, David R ^[1]; Notestein, John E ^[2]

Star City, WV
Morgantown, WV

Issue Date:: 1986-01-01

Research Org.:: National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV (United States)

OSTI Identifier:: 866008

Patent Number(s):: 4616137

Assignee:: United States of America as represented by United States (Washington, DC)

Resource Type:: Patent

Country of Publication:: United States

Language:: English

Subject:: optical; emission; line; monitor; background; observation; cancellation; fiber; optics; based; monitoring; provided; selected; spectral; lines; sodium; d-line; coal; combustion; detected; presence; interferring; blackbody; radiation; emissions; intensity; bifurcated; optic; light; guide; adapted; branch; view; guided; bandpass; filter; common; trunk; portion; reflected; centered; wavelength; corresponding; bandwidth; nanometers; nm; width; 10; detectors; located; passing; filters; respectively; detector; blind; difference; outputs; uniquely; indicative; flame; instrument; reduce; effects; 20; db; selected spectral; light detectors; detector output; bandpass filter; coal combustion; fiber optics; fiber optic; light guide; emission line; optic light; blackbody radiation; light detector; pass filter; light passing; spectral emission; optical emission; flame emission; emission lines; line emission; optics based; detector outputs; based optical; line monitoring; /250/340/356/431/

Citation Formats


                    Goff, David R, and Notestein, John E. Optical emission line monitor with background observation and cancellation.  United States: N. p., 1986. 
        Web.

Copy to clipboard


                    Goff, David R, & Notestein, John E. Optical emission line monitor with background observation and cancellation.  United States.

Copy to clipboard


                    Goff, David R, and Notestein, John E. Wed .  
        "Optical emission line monitor with background observation and cancellation".  United States.  https://www.osti.gov/servlets/purl/866008.

Copy to clipboard


                    
@article{osti_866008,

  title        = {Optical emission line monitor with background observation and cancellation},

  author       = {Goff, David R and Notestein, John E},

  abstractNote = {A fiber optics based optical emission line monitoring system is provided in which selected spectral emission lines, such as the sodium D-line emission in coal combustion, may be detected in the presence of interferring background or blackbody radiation with emissions much greater in intensity than that of the emission line being detected. A bifurcated fiber optic light guide is adapted at the end of one branch to view the combustion light which is guided to a first bandpass filter, adapted to the common trunk end of the fiber. A portion of the light is reflected back through the common trunk portion of the fiber to a second bandpass filter adapted to the end of the other branch of the fiber. The first filter bandpass is centered at a wavelength corresponding to the emission line to be detected with a bandwidth of about three nanometers (nm). The second filter is centered at the same wavelength but having a width of about 10 nm. First and second light detectors are located to view the light passing through the first and second filters respectively. Thus, the second detector is blind to the light corresponding to the emission line of interest detected by the first detector and the difference between the two detector outputs is uniquely indicative of the intensity of only the combustion flame emission of interest. This instrument can reduce the effects of interferring blackbody radiation by greater than 20 dB.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {1986},

  month        = {1}

}

Copy to clipboard

Patent:

View Patent

Save / Share:

Export Metadata

Save to My Library

Similar Records in DOE Patents and OSTI.GOV collections:

Background canceling surface alpha detector

Patent MacArthur, Duncan W [Los Alamos, NM]; Allander, Krag S [Ojo Caliente, NM]; Bounds, John A [Los Alamos, NM]

A background canceling long range alpha detector which is capable of providing output proportional to both the alpha radiation emitted from a surface and to radioactive gas emanating from the surface. The detector operates by using an electrical field between first and second signal planes, an enclosure and the surface or substance to be monitored for alpha radiation. The first and second signal planes are maintained at the same voltage with respect to the electrically conductive enclosure, reducing leakage currents. In the presence of alpha radiation and radioactive gas decay, the signal from the first signal plane is proportional tomore »« less
Full Text Available
Optical monitor for observing turbulent flow

Patent Albrecht, Georg F [Livermore, CA]; Moore, Thomas R [Rochester, NY]

The present invention provides an apparatus and method for non-invasively monitoring turbulent fluid flows including anisotropic flows. The present invention uses an optical technique to filter out the rays travelling in a straight line, while transmitting rays with turbulence induced fluctuations in time. The output is two dimensional, and can provide data regarding the spectral intensity distribution, or a view of the turbulence in real time. The optical monitor of the present invention comprises a laser that produces a coherent output beam that is directed through a fluid flow, which phase-modulates the beam. The beam is applied to a temporalmore »« less
Full Text Available
Method and apparatus for reducing solvent luminescence background emissions

Patent Affleck, Rhett L [Los Alamos, NM]; Ambrose, W Patrick [Los Alamos, NM]; Demas, James N [Charlottesville, VA]; ...

The detectability of luminescent molecules in solution is enhanced by reducing the background luminescence due to impurity species also present in the solution. A light source that illuminates the solution acts to photolyze the impurities so that the impurities do not luminesce in the fluorescence band of the molecule of interest. Molecules of interest may be carried through the photolysis region in the solution or may be introduced into the solution after the photolysis region.
Full Text Available
Apparatus for reducing solvent luminescence background emissions

Patent Affleck, Rhett L [Los Alamos, NM]; Ambrose, W Patrick [Los Alamos, NM]; Demas, James N [Charlottesville, VA]; ...

The detectability of luminescent molecules in solution is enhanced by reducing the background luminescence due to impurity species also present in the solution. A light source that illuminates the solution acts to photolyze the impurities so that the impurities do not luminesce in the fluorescence band of the molecule of interest. Molecules of interest may be carried through the photolysis region in the solution or may be introduced into the solution after the photolysis region.
Full Text Available
Background-free balanced optical cross correlator

Patent Nejadmalayeri, Amir Hossein; Kaertner, Franz X

A balanced optical cross correlator includes an optical waveguide, a first photodiode including a first n-type semiconductor and a first p-type semiconductor positioned about the optical waveguide on a first side of the optical waveguide's point of symmetry, and a second photodiode including a second n-type semiconductor and a second p-type semiconductor positioned about the optical waveguide on a second side of the optical waveguide's point of symmetry. A balanced receiver including first and second inputs is configured to produce an output current or voltage that reflects a difference in currents or voltages, originating from the first and the secondmore »« less
Full Text Available

Similar Records