Fiberoptic temperature/pressure sensor system

Details Fiberoptic temperature/pressure sensor system Fiberoptic temperature/pressure sensor system

1986-08-01

1987-10-27

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250231P, 73705, 73745, H01J 516

Patent

active

047031743

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.

REFERENCES:
patent: 3503116 (1970-03-01), Strack
patent: 3831137 (1974-08-01), Cuomo
patent: 4322978 (1982-04-01), Fromm
patent: 4358960 (1982-11-01), Porter
patent: 4509370 (1985-04-01), Hirschfeld
patent: 4588886 (1986-05-01), Snider

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