Interferometer gyroscope having two feedback loops

Details Interferometer gyroscope having two feedback loops Interferometer gyroscope having two feedback loops

1986-08-22

1989-06-20

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01B 902

Patent

active

048404896

ABSTRACT:
A Sagnac interferometer gyroscope including periodic generator driving an optical modulator coupled to one end of the fiber optic loop, the signals from the fiber optic loop being coupled through two feedback loops. The first feedback loop operating on a signal equal to the twice the periodic generator signal frequency which is integrated and supplied, together with the signal from the periodic generator to a summing circuit to drive the optical modulator such that it maintains the measurement of the gyroscope output through specific quad points. The second feedback loop operates on a signal at a frequency equal to the frequency of the periodic generator and provides the integrated value of this signal after demodulation to summing circuit, together with a calibration signal, the output signal from the summing circuit being applied to a line stretcher element in the Sagnac fiber optic loop to maintain the output signal at a constant scale factor.

REFERENCES:
patent: 4274742 (1981-06-01), Lustig
patent: 4491413 (1985-01-01), Rashleigh
patent: 4673293 (1987-06-01), Sanders
"Passive Ring Resonator Method for Sensitive Inertial Rotation Measurements in Geophysics and Relativity", Sanders et al, Optics Letters, 11-1981, pp. 569-571.

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