Fiber optic gyro using alternating bias phase and bias correctio

Details Fiber optic gyro using alternating bias phase and bias correctio Fiber optic gyro using alternating bias phase and bias correctio

1991-06-19

1992-11-10

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01C 1972

Patent

active

051628716

ABSTRACT:
In a fiber optic gyro, a clockwise propagating light ray and a counterclockwise propagating light ray propagate in an optical fiber coil in a time of .tau., and are given a bias phase modulation signal by a phase modulator connected at an end of said optical fiber coil, in such a manner that a phase shift increasing stepwise by .pi./2 radian every time interval T is applied n steps and then a phase shift decreasing stepwise by .pi./2 radian every time interval T is applied n steps, to the phase modulator. A signal generator generates a bias phase modulation signal every time interval T according to an oscillation frequency of a voltage controlled oscillator. An interference light beam of said clockwise and counterclockwise propagating light rays is converted to an electric signal by an opto-electric converter and, if the time interval T does not coincide with a propagation time, a positive- or negative-going pulse is created in an output of the opto-electric converter during a period for the bias phase modulation signal to increase or decrease. Such a positive- or negative-going pulse is detected by a pulse detector and, based on a detected result, an oscillation frequency of the voltage controlled oscillator is controlled so that said pulses no longer occur.

REFERENCES:
patent: 4591269 (1986-05-01), Mohr
patent: 4759629 (1988-07-01), Everest et al.
patent: 4871254 (1989-10-01), Lefevre et al.

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