Laser gyro with dithered mirrors and current dither
Patent
·
OSTI ID:6535619
This patent describes a laser gyro for detecting rates of rotation, the gyro having a body with a polygonal shaped cavity therein forming a closed loop path through which two counter-rotating beams travel and having a mirror disposed at each of the corners of the cavity for reflecting the beams about the path. A means is included for eliminating errors in the output of the gyro caused by lock-in of the beams. The laser gyro comprises: means for generating a sine wave drive signal; first means responsive to the drive signal for vibrating one of the mirrors in a direction perpendicular to the surface of the mirror; second means responsive to the drive signal for vibrating another of the mirrors in a direction perpendicular to the surface of the mirror and 180/sup 0/ out of phase with the one mirror; means for deriving a feedback signal from one of the vibrating means; and means responsive to the feedback signal for modifying the sine wave drive signal to at least one of the mirror vibrating means.
- Assignee:
- Sundstrand Optical Technologies, Inc., Newbury, CA
- Patent Number(s):
- US 4653919
- OSTI ID:
- 6535619
- Country of Publication:
- United States
- Language:
- English
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