Laser gyro with phased dithered mirrors

Details Laser gyro with phased dithered mirrors Laser gyro with phased dithered mirrors

1978-12-18

1981-08-04

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01C 1964

Patent

active

042819300

ABSTRACT:
A single mode laser gyro having two oppositely traveling laser beams is provided with mechanically dithered mirrors at its three or four reflection points. Each mirror is mounted for movement in and out as the result of the expansion and contraction of stacks of piezoelectric elements associated with each mirror. The mirrors are dithered or oscillated in and out, at the same frequency and in phase relationship with one another so that the perimeter distance for the laser cavity is held at a fixed number of wavelengths, but the laser beam translates back and forth across the faces of the mirrors. By this technique, the undesired phenomena of lock-in at low rotation rates is avoided, without the need for special optical or magnetic structures in the path of the laser beam.

REFERENCES:
patent: 3533014 (1970-10-01), Coccoli et al.
patent: 3581227 (1971-05-01), Podgorski
patent: 4152071 (1979-05-01), Podgorski

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