Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1987-09-03
1989-01-24
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250231R, H01J 516
Patent
active
048002666
ABSTRACT:
The invention is an optical fiber sensor system in which an optical source, such as a laser diode, emits a pulse of optical energy which is transmitted in an optical path through an optical energy modulator. A partial reflector, included in the optical path before the optical modulator, reflects a portion of the optical energy of the pulse. The optical path terminates in an optical reflector, where the pulse is reflected back through the optical modulator to the partial reflector. The optical energy reflected by the partial reflector and the terminating reflector travels along the same optical path from the partial reflector to a photodetector and demodulator, where the magnitude of the parameter modulating the light modulator is determined from the relative magnitude of the energy reflected from the partial reflector and the terminating reflector.
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Nelms David C.
Thigpen E. Eugene
Western Atlas International Inc.
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