Blackbody radiation sensing optical fiber thermometer system

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250227, 364571, 374133, 374161, 374170, G01J 518, G06F 1532

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active

047501391

ABSTRACT:
An optical fiber thermometer system utilizing the laws of blackbody radiation includes a sensor responsive to the temperature within a region to be tested for transmitting light energy generated as a function of the temperature according to Planck's equation along an optical transmission line, and a detector responsive to the light energy for producing an electrical current. The current is amplified by a linear amplifier having provision for automatically controlling the gain of the amplifier, depending upon the magnitude of the input current, to reduce the dynamic range of the input current. The output of the linear amplifier is a voltage which is used by a signal processing network to yield an accurate indication of the temperature within the region to be tested by solving the Planck equation between two predetermined wavelengths representing upper and lower limits of an optical filter which filters light energy entering the detector.

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"High Temperature Optical Fiber Thermometer." R. R. Dils, Journal of Applied Physics (3) Mar. 1983.

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