Ring laser gyroscope readout for partially overlapping beams

Details Ring laser gyroscope readout for partially overlapping beams Ring laser gyroscope readout for partially overlapping beams

1982-08-23

1985-04-30

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01C 1964

Patent

active

045140871

ABSTRACT:
A ring laser gyroscope includes a laser ring having at least three reflective surfaces. At least one of the reflective surfaces is partially reflecting and partially transmissive for removing a portion of the laser light within the ring, and for directing the removed light onto an output detector. Optical elements are provided for displacing the light directed on the output detector in a fashion by which a portion of the light from one of the counter rotating beams only partially overlaps the light from the other beam. A detector is provided for detecting the intensity of each of the counter rotating beams from the nonoverlapping beam portions on the detector and for detecting the fringe motion of the interfacing beams produced by the overlapping portions of the beams on the detector.
In another aspect, a detector is provided for detecting the intensity and frequency differences of the counter rotating beams in which two intensity producing detectors are provided spaced apart by a distance corresponding approximately to the overlapping portions of the counter rotating light beams upon the detector, whereby the overlapping portions of the beams fall generally between the two detectors. A plurality of detector stripes are provided between the two intensity detectors, whereby stripes of the interference patterns move across the detector stripes to provide an indication of the frequency difference between the counter rotating beams and sense of rotational input.

REFERENCES:
patent: 3879130 (1975-04-01), Greenstein

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