Fiber-optic gyroscope obtaining a signal from a perturbed light

Details Fiber-optic gyroscope obtaining a signal from a perturbed light Fiber-optic gyroscope obtaining a signal from a perturbed light

1993-08-31

1995-08-22

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01C 1972

Patent

active

054445337

ABSTRACT:
Conventional fiber-optic gyroscopes were provided with an independent photodetector for detecting interfering beams. The existence of the independent photodetector required two beam dividing-and-combining devices for equalizing the experiences of the clockwise-spreading beams and the counterclockwise-spreading beams. Curtailment of an expensive beam dividing-and-combining device is desirable for reducing the cost of gyroscopes. This invention dispenses with the independent photodetector. Instead of the independent photodetector, the light source itself or the monitoring photodiode detects the interfering beams by the change of driving current, applied voltage or photocurrent. Elimination of the independent photodetector saves one beam dividing-and-combining device by equalizing the path of the progressing beams to the path of the regressing beams. Optimum light sources, interposition of polarizer, position of depolarizer and use of birefringent material as polarizer are explained.

REFERENCES:
patent: 4529313 (1985-07-01), Petermann et al.
patent: 4842409 (1989-06-01), Arditty et al.
patent: 4848910 (1989-07-01), Dupraz
patent: 5106193 (1992-04-01), Feslea et al.
Patent Abstracts of Japan, vol. 16, No. 527 (P-1447) 29 Oct. 1992 & JP-A-A 04 195778 (Hitachi Ltd.) 15 Jul. 1992.

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