Fiber optic gyroscope having improved readout and modulation ind

Details Fiber optic gyroscope having improved readout and modulation ind Fiber optic gyroscope having improved readout and modulation ind

1998-02-04

2000-02-22

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01C 1972

Patent

active

060286687

ABSTRACT:
An open loop fiber optic gyroscope having improved linearity and scale factor accuracy in the rate signal output and improved modulation index control is disclosed. A digital phase tracker is utilized to derive the Sagnac phase shift from signals proportional to cosine and sine values of the Sagnac phase shift. The rate output is independent of the amplitude of the optical power in the gyroscope and is linear for very large input rates. A modulation servo utilizes the second and fourth harmonic signals from the output of the fiber optic gyroscope to control modulation.

REFERENCES:
patent: 4796993 (1989-01-01), Sonobe et al.
patent: 4883358 (1989-11-01), Okada
patent: 5202747 (1993-04-01), Kersey
patent: 5412472 (1995-05-01), Okada et al.

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