Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1993-09-08
1995-03-28
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250226, H01J 516
Patent
active
054019591
ABSTRACT:
An optical temperature compensation system for spectral modulation sensors comprises a light director for receiving excitation light and a spectral modulation sensor for receiving a first portion of the excitation light from the light director. A source monitoring component is positioned for receiving a second portion of the excitation light from the light director. The source monitoring component includes offset optics optically coupled to the light director, a source dichroic filter for splitting the light from the offset optics, a first source photodetector for receiving wavelengths above the effective cutoff wavelength of the source dichroic filter, and a second source photodetector for receiving wavelengths below the effective cutoff wavelength of the source dichroic filter. A detection monitoring component is positioned for receiving modulated light from the spectral modulation sensor and comprises a detection dichroic filter for splitting light from the spectral modulation sensor, a first detection photodetector for receiving wavelengths above the effective cutoff wavelength of the detection dichroic filter, and a second detection photodetector for receiving wavelengths below the effective cutoff wavelength of the detection dichroic filter.
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General Electric Company
Kratz Ann M.
Le Que T.
Nelms David C.
Snyder Marvin
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