High performance fiber optic sensor

Details High performance fiber optic sensor High performance fiber optic sensor

1989-03-31

1991-04-30

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356345, H01J 516

Patent

active

050120883

ABSTRACT:
An optical sensor and method for measuring naturally occurring phenomena such as vibrations is disclosed. An optic fiber is wound as a coil and placed such that strain is introduced in it by the phenomena. Low coherence light is launched through a coupler and split to produce counter rotating beams in the coil. The counter rotating beams are phase modulated by an optical modulator driven by an oscillator and by naturally occurring phenomena. The sensitivity and response of the sensor increases dependent on the length of fiber in the coil and improves linearly as the frequency of source signal increases. The modulated counter rotating beams are recombined in the coupler to produce an intensity modulated optical signal on a photodetector. The output of the detector is an electrical signal containing the signal of interest as modulation which is recovered througth demodulating circuits mixing the fundamental and second harmonic frequencies.

REFERENCES:
patent: 4375680 (1983-03-01), Cahill et al.
patent: 4495411 (1985-01-01), Rashleigh
patent: 4848910 (1989-07-01), Dupraz
patent: 4853534 (1989-08-01), Dakin

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