Laser angular rate sensor with dithered mirrors

Coherent light generators – Particular resonant cavity – Folded cavity

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Details

356350, H01S 3083, G01B 902

Patent

active

046866833

ABSTRACT:
A laser angular rate sensor has four corner mirrors forming a substantially square ring laser to reflect two counterpropagating laser beams around a closed path. Dither vibrators are interconnected to two consecutive mirrors in the path to oscillate perpendicularly to their mirror surfaces with 180 degree phase opposition. In one embodiment the mirror displacement is controlled to an amplitude of substantially 0.541 times the wave length of the laser light. In a second embodiment the mirror displacement amplitude is controlled to minimize the alternating component beat amplitude between one of the two laser beams and light scattered by the mirrors from the other beam. A microprocessor responsive to the output beat frequency of the ring laser gyro disconnects the dither drives when the amplitude of the input angular velocity to be measured exceeds a predetermined value greater than the maximum limit of the lock-in range of the gyro.

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