Optical temperature compensation of spectral modulation sensors by ratiometric interrogation having dichroic filters
Patent 5401959 Issued on March 28, 1995. Estimated Expiration Date: 
September 8, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 8, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesOptical measuring device using a spectral modulation sensor having an optically resonant structure Body position sensor by phase comparison of modulated light waves transmitted through optical fiber Fiber optic sensor system with a redundancy means and optimized throughout Patent #: 5191208 InventorApplicationNo. 118467 filed on 09/08/1993US Classes:250/227.23, With spectral frequency/wavelength discrimination250/226Color (e.g., filter or spectroscope)ExaminersPrimary: Nelms, David C.Assistant: Le, Que T. Attorney, Agent or FirmInternational ClassH01J 005/16AbstractAn 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.Other References
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