Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1984-03-02
1987-06-09
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250231R, 374121, 374205, H01J 516
Patent
active
046721991
ABSTRACT:
A fiberoptic sensing system comprising a light source, a sensor responsive to external stimulus, an optical fiber connected to the light source and the sensor, a detector arranged to receive light from the optical fiber, and output electronics electrically connected to the detector. The sensor includes a reflective surface arranged so as to reflect light from the optical fiber. This reflective surface is movable relative to the optical fiber. The light source comprises a light-emitting diode and a reference diode electrically connected to the source of electrical energy and to the light-emitting diode. A beamsplitter is disposed about the light source, the optical fiber, and the photodetector. The detector includes a transimpedance amplifier and a RMS to DC converter. The output electronics includes a gain control and a offset control. The sensor may be either a temperature sensor or a pressure sensor.
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patent: 4417140 (1983-11-01), Adolfsson et al.
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patent: 4521683 (1985-06-01), Miller
patent: 4531230 (1985-07-01), Brogardh
patent: 4556280 (1985-12-01), Bagby
Anderson John C.
Davies Morris J.
Lamb Archie C.
Fiberdynamics, Inc.
Nelms David C.
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