Apparatus and method for detecting rotation rate and direction o

Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer

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G01C 1964

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048366757

ABSTRACT:
A multioscillator ring laser gyroscope includes a frame that encloses a closed optical path in which four circularly polarized optical waves propagate. A combining optics system combining the waves to produce an interference pattern. A pair of photodetectors are placed in the interference pattern in half quadrature with respect to the interference pattern so that the detectors produce oscillatory output signals that are in quadrature with respect to each other. Signals indicative of the beat signal in the interference pattern are processed to determine the rotation rate, the direction of rotation and to provide a cavity length control signal.

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