Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
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
Bush Ira J.
Cole James H.
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