Fiber optic Sagnac interferometer with digital phase ramp resett

Details Fiber optic Sagnac interferometer with digital phase ramp resett Fiber optic Sagnac interferometer with digital phase ramp resett

1990-12-24

1992-05-26

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01C 1972

Patent

active

051161273

ABSTRACT:
In a fiber optic interferometer rotation rate sensor reset by phase ramp via a digital control circuit to undertake the reversal required to obtain the scale factor error information, a reciprocal, alternating phase shift that is not a function of the angle of rotation, but has a fixed timing, is synchronized with gyroscope modulation frequency to avoid lock-in, and scale factor nonlinearities, particularly in the case of low rates of rotation. Even in the case of low rates of rotation, a scale factor error correction is possible and lock-in, caused by variations in bias in the case of the modulation deviation reversal, is avoided.

REFERENCES:
patent: 4705399 (1987-11-01), Graindorge et al.

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