Optical gyroscope

Details Optical gyroscope Optical gyroscope

1983-08-11

1985-10-08

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01C 964

Patent

active

045456828

ABSTRACT:
A light source signal is amplitude modulated by a phase modulated sinusoid and passes through two directional couplers so that two beams are formed. The beams are transmitted to the ends of an optic-fiber coil for propagation therethrough in opposite circular directions. An optical phase modulator is present at one end of the coil so that a phase modulation of fixed frequency and amplitude is introduced to a first beam as it enters the coil and to the counterpropagating beam as it leaves the coil. The counterpropagating beams produce a signal at a photodetector which is a function of rotation rate. An electronic control unit is connected to the photodetector to generate a digital signal output as a frequency which is a measure of rotation rate. A feedback loop is completed by connecting a signal, produced by the control unit, to the amplitude modulated light source for nulling the phase shift due to rotation rate.

REFERENCES:
patent: 4299490 (1981-11-01), Cahill et al.
patent: 4372685 (1983-02-01), Ulrich
Davis et al., "Techniques for Shot Noise Limited Inertial Rotation Measurement Using a Multiturn Fiber Sagnac Interferometer", SPIE, 1978, pp. 131-136.

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