Fiber optic gyroscope output noise reducer

Details Fiber optic gyroscope output noise reducer Fiber optic gyroscope output noise reducer

1993-11-24

1995-11-21

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01C 1972

Patent

active

054692571

ABSTRACT:
A noise reducer for reducing the results in the system output signal of optical noise introduced into an optical subsystem therein, having a phase modulator, by a source through obtaining a noise representation signal used to offset the noise components in the signal obtained from the output of the optical subsystem. This noise representation signal is not delayed in the obtaining thereof by any more than half the delays of the waves emitted from the source in reaching the optical subsystem output. The noise reducer may incorporate a device for adjusting the amplitude of the noise representation signal. It may also include another device for adjusting the phase of the noise representation signal, which may be used to affect the amplitude of the noise representation signal. These adjustments can result in an optimization of the noise representation signal so as to better effectively cancel the optical noise signal at the output of the fiber optic gyro having the noise reducer. The phase adjustment may be accomplished by affecting the phase of the bias modulation signal that goes to demodulate the fiber optic gyroscope system output signal or to demodulate both the fiber optic gyroscope system output signal and the noise representation signal, before the two latter signals are combined. A generator may be used for constructing a periodic signal, such as a triangular wave, having an appropriate amplitude and phase, to be a noise representation signal that is used to offset or cancel the noise components in the output signal from the fiber optic gyroscope system.

REFERENCES:
patent: 5331404 (1994-07-01), Moeller et al.
R. Moeller et al., "1.06-.mu.m all-fiber gyroscope with noise subtraction," Dec. 1, 1991, Optics Letters, vol. 16, No. 23.
Article entitled "Intensity Noise in Long-Wavelength Superluminescent Sources", by Chung E. Lee and Henry F. Taylor, pp. 1171-1174, IEEE Journal of Quantum Electronics, vol. 27, No. 5, May 1991.
P2 "1.06 .mu.m All-Fiber Gyroscope with Noise Subtraction" by R. P. Moeller and W. K. Burns, Proceedings of the Conference on Optical Fibers Sensors, Jan. 19, 1992, Monterey, California, pp. 82 through 85. Sponsored by the Institute of Electrical and Electronic Engineers-Optical Society of America.

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