Multi-oscillator ring laser gyroscope with improved stabilization
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United States of America Patent
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Mar 17, 1992
Issued Date -
N/A
app pub date -
Feb 28, 1991
filing date -
Feb 3, 1989
priority date (Note) -
Expired
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Abstract
The gyroscope had a closed optical path (10) defined by four reflecting surfaces (11, 12, 13, 14). Counter-rotating beams of radiation circulating around the closed path are produced by a gaseous active lasing medium executed over a gain region (15) to produce a discharge in the gas. A reciprocal dispersion element (18) is located in the optical path and a solenoid (23) is wound around part of the gain region to produce a magnetic field over that region. One of the reflecting surfaces (14) is a partially transmitting mirror which passes a small proportion of the radiation incident upon it, and detectors (19, 20) detect radiation in each counter-rotating beams passing through the mirror (14). The alternating current components of the outputs of the detectors are used to control a control circuit (22) so as to control the magnetic field produced by the solenoid (23).
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