Fiber optic gyro

Details Fiber optic gyro Fiber optic gyro

1990-08-03

1991-04-23

Healy, Brian

Optics: measuring and testing

Range or remote distance finding

With photodetection

350 9613, 356350, G02B 626, G01B 902

Patent

active

050094807

ABSTRACT:
In a fiber optic gyro in which a biasing phase modulator and a ramp phase modulator are provided at the one end and the other end of an optical fiber coil, a biasing voltage and a ramp voltage are applied to the phase modulators to induce a phase difference between two rays of light which propagate through the optical fiber coil in opposite directions, the interference light is detected by a photodetector, the phase difference component is obtained from the photodetector output by a synchronous detector, and the synchronous detector output is used to control the polarity and the frequency of the ramp voltage, an external signal is added to the synchronous detector, output to fluctuate the frequency of the ramp voltage, or a component of an image frequency spaced apart from the frequency of the biasing voltage by a value twice the intermediate frequency is removed by a subtractor from the synchronous detector output, thereby improving the scale factor of the fiber optic gyro.

REFERENCES:
patent: 4545682 (1985-10-01), Greenwood
patent: 4687330 (1987-08-01), Lefevre
patent: 4717256 (1988-01-01), Ensley et al.
patent: 4728192 (1988-03-01), Shaw et al.
patent: 4796993 (1989-01-01), Sonobe et al.
patent: 4840489 (1989-06-01), Coccoli
patent: 4842358 (1989-06-01), Hall
patent: 4848910 (1989-07-01), Dupraz
patent: 4887900 (1989-12-01), Hall
patent: 4906096 (1990-03-01), Pavlath
patent: 4915503 (1990-04-01), Pavlath

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