Method and apparatus for increasing the stability of a fiber opt

Details Method and apparatus for increasing the stability of a fiber opt Method and apparatus for increasing the stability of a fiber opt

1997-07-31

1999-09-14

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01C 1972

Patent

active

059531223

ABSTRACT:
A small modulation current is applied to the light source of a Sagnac-type fiber optic gyroscope to increase accuracy and/or stability of scale factor (open loop configuration) and to reduce bias errors and random walk (closed-loop configuration). The phase and amplitude of the modulation current are controlled through a control circuit whose reference is picked off at a first beamsplitter in series with the light source. In such a way, light emitted from the light source into the interferometer contains no modulation. The elimination of modulation removes a source that would otherwise cause deterioration of gyroscope stability resulting from light returning from the interferometer or due to electrical interference, thus limiting measurement accuracy.

REFERENCES:
patent: 4842358 (1989-06-01), Hall
patent: 4875775 (1989-10-01), Michal et al.
patent: 5184195 (1993-02-01), Goldner

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