Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1990-04-02
1991-10-01
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
2502311, 374161, 324244, 324 96, 359246, 359282, 359288, H01J 516, G01R 3100, G01R 3302, G01K 700
Patent
active
050536176
ABSTRACT:
An instrument including a light-emitter for emitting a light beam, a sensing head portion through which the light beam is transmitted, a light-detective element receiving the beam from the head portion, and a detector receiving an electric signal from the light-detective element. The head portion has a thermo-optical element for changing a first component of the light beam with an ambient temperature, and an optical element for changing a second component of the beam with an electric quantity. The electric signal produced by the light-detective element has a first and a second component which correspond to the first and second components of the light beam, respectively. The detector determines the ambient temperature based on the first component of the electric signal, and determines the electric quantity based on the second component of the electric signal. The electric quantity may be an AC magnetic field, a current, an AC electric field or a voltage.
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"Fiber-Optic Instrument for Temperature Measurement", by Kyuma et al., IEEE Journal of Quantum Electronics, vol. QE-18, No. 4, Apr. 1982.
Kakizaki Yuichi
Kozuka Yoshinari
Messinger Michael
Nelms David C.
NGK Insulators Ltd.
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