Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1993-08-31
1995-08-29
Sikes, William L.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
35022718, H01J 516, H01J 4014
Patent
active
054462800
ABSTRACT:
A fiber optic sensor is fully compensated for light source intensity variation, fiber losses and modal power distribution by providing input to one end of an optical fiber from a relatively broad band light source containing at least two spectrally separated wavelengths. At least one of these spectrally separated wavelengths is reflected back into the optical fiber by a filter located between a second end of the optical fiber and a reflective transducer. The filter is preferably of the interference edge filter type and has a nominal cut-off wavelength within the spectral band of the light source or between the two spectrally separated wavelengths. Therefore, the paths traversed by light of the spectrally separated wavelengths will differ only by twice traversing the reflective transducer. Temperature measurement or compensation can also be provided by sensing of reflected light intensity or power at approximately the nominal cut-off frequency of the filter. Reflective transducers of both the intensity-based and interferometric types are usable with the invention.
REFERENCES:
patent: 4355910 (1982-10-01), Quick
patent: 4356396 (1982-10-01), Ruell
patent: 4659923 (1987-04-01), Hicks
patent: 5001338 (1991-03-01), Boero
patent: 5275053 (1994-01-01), Wlodarczyk
patent: 5345519 (1994-09-01), Lu
"Loss Compensation Technique Using a Split-Spectrum Approach for Optical Fiber Air-gap Intensity-based Sensors"; Anbo Wang et al.; Sep. 9, 1992; Society of Photo-optical Instrumentation Engineers; Boston, Massachusetts; Fiber & Electro-Optics Research Center, Bradley Department of Electrical Engineering, VPI, Blacksburg, Virginia.
Claus Richard O.
Murphy Kent A.
Wang Anbo
Center For Innovative Technology
Nguyen Tiep H.
Sikes William L.
Virginia Polytechnic Institute and State University
Virginia Tech Intellectual Properties Inc.
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