Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1982-02-22
1985-06-04
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250231R, 7386259, G02B 514
Patent
active
045216843
ABSTRACT:
An instrumentation system for use in measuring and processing industrial process variables, such as flow, pressure, or temperature, includes a resonant element sensor whose resonant frequency varies in accordance with changes in the desired process variable communicating through an optical fiber link to a distant control room. The sensor is activated into resonant physical motion by light energy from a source in the control room, while the motion of the wire is sensed optically and retransmitted to the control room to produce an output signal whose frequency is equal to that of the resonating element. A feedback network maintains the sensor in resonance by synchronizing the delivery of light energy to the motion of the resonant element. The powering and sensing aspect may be performed by individual fiber optic cables or alternatively this function may be combined by utilizing a single fiber optic strand.
REFERENCES:
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patent: 4346478 (1982-08-01), Sichling
patent: 4356396 (1982-10-01), Ruell et al.
patent: 4372164 (1983-02-01), Brown et al.
patent: 4379226 (1983-04-01), Sichling et al.
patent: 4417140 (1983-11-01), Adolfsson et al.
Control and Instrumentation, vol. 13, No. 3, Mar. 1981, pp. 45, 47, J. Brotton: "Remote Sensing Could Emerge as a Major Role for Fiber Optics".
Gilby Anthony C.
Lewis Edward L.
Olsen Everett O.
Martin Terrence
Meyer William E.
Nelms David C.
The Foxboro Company
Wu Jack H.
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