Fiber optic sensor

Details Fiber optic sensor Fiber optic sensor

G - Physics

01

L

325/1, 340/96

G01L 1/10 (2006.01) G01L 1/08 (2006.01)

Patent

CA 1196706

Abstract of the disclosure An instrumentation system for use in measuring and processing industrial process variables, such as flow, pressure, or temperature, includes a resonant element sensor whose reso- nant 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 acti- vated 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.

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