Ring laser gyroscope beam combiner for separating and combining circulating laser beams for power and fringe pattern detections
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United States of America Patent
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Dec 12, 1989
Grant Date -
N/A
app pub date -
Apr 6, 1987
filing date -
Apr 6, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a monolithic gyro assembly having three ring laser gyroscopes each measuring the inertial rotation of an axis, a polyhedron having three facets is used as the beam combiner for the gyroscope. On one of the facets is mounted a fringe detector for providing inertial rotation information for the gyroscope. On the remaining two facets, on either side of the fringe detector facet, are mounted beam power monitoring diodes for measuring the power of the light intensity of the respective beams. The directly measured power from the beams is then used to move a piezoelectric transducer to maintain constant pathlengths for the gyroscope.
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