Modulation frequency control in a fiber optic rotation sensor

Details Modulation frequency control in a fiber optic rotation sensor Modulation frequency control in a fiber optic rotation sensor

1990-06-04

1992-02-25

Turner, Samuel

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01C 1972

Patent

active

050908090

ABSTRACT:
In a fiber optic rotation sensor having a pair of light waves counter-propagating in an optical waveguide loop, a phase modulator is driven by a modulating signal at the loop eigenfrequency. Upon exiting the loop the waves are combined into a light intensity signal which is sensed, the sensed signal including a component in quadrature with a desired rotation rate component, the magnitude of the quadrature component being proportional to any deviations in the frequency of the modulating signal from the loop eigenfrequency. The phase modulator is servo-controlled so as to drive the quadrature component to zero, thereby compensating for any deviations in the modulator frequency from the loop eigenfrequency.

REFERENCES:
patent: 4883358 (1989-11-01), Orada

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