In-flight engine control optical pyrometer
Patent 4657386 Issued on April 14, 1987. Estimated Expiration Date: 
November 14, 2005. 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.
November 14, 2005. 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 pyrometer and technique for temperature measurement Pyrometer system using separated spectral components from a heat source Patent #: 4326798 InventorsApplicationNo. 06/798214 filed on 11/14/1985US Classes:356/45, Plural color responsive356/43, OPTICAL PYROMETERS374/127Having significant frequency limitation or relationship (e.g., peak, ratio)ExaminersPrimary: LaRoche, Eugene R.Assistant: Pascal, Robert Attorney, Agent or FirmInternational ClassG01J 5/60 (20060101)AbstractA novel dual spectra optical pyrometer for use in in-flight control of jet engines includes an optical probe containing a shutter sensitive to the air pressure within the jet engine. The shutter provides an optical beam from rotating turbine blades to an optical fiber only above a threshold pressure. A serial array of photodetectors receives the optical beam and provides first and second signals therefrom. A signal processor receives the first and second signals as well as signals indicative of the energy ratio therebetween, and provides reflection corrected energy signals from the difference between the first signals and the product of the energy ratio signals and the second signals.Other References
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