Laser rotation rate sensor
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United States of America Patent
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-
Dec 3, 1985
Grant Date -
N/A
app pub date -
Feb 9, 1983
filing date -
Jun 13, 1981
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to a laser rotation rate sensor wherein two light beams counterrotate in a polygon equipped with reflectors at its corners, a signal depending on the rate of rotation being derived from the frequency difference. One of the reflectors employed is designed as a magneto-optic element so as to suppress lock-in. This reflector includes a prism whose base boundary face is provided with a layer of a material having a lower index of refraction than the prism material. At least one of these materials is a gyrotropic material. Almost no reflection occurs when light enters the prism at the two lateral faces due to adherence to the Brewster condition. Further, the angle of incidence of the beams on the interface with the layer having a lower index of refraction than the prism material is so large that total reflection occurs.
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