Ring laser gyro bias drift improvement method and apparatus

Details Ring laser gyro bias drift improvement method and apparatus Ring laser gyro bias drift improvement method and apparatus

1992-06-18

1995-08-01

Hellner, Mark

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01B 902

Patent

active

054384109

ABSTRACT:
A ring laser gyro bias drift improvement method and apparatus for compensating for periodic bias drift including a microprocessor which controls a path length control circuit that continuously adjusts the position of path length control mirrors. The mirrors are stepped through a range of positions that represent two laser modes. The microprocessor adjusts the position of the two path length control mirrors such that total path length remains constant. The invention improves bias drift by forcing the laser gyro system to operate at varying path length control positions. Each position has a varying bias that was shown to be periodic over two laser modes. By operating the laser system over a range of two laser modes the periodic bias error of the laser gyro is cancelled out over time.

REFERENCES:
patent: 3581227 (1971-05-01), Podgorski
patent: 4152071 (1979-05-01), Podgorski
patent: 4267478 (1981-05-01), Ljung et al.
patent: 4320974 (1982-03-01), Ljung
patent: 4383763 (1983-05-01), Hutchings et al.
patent: 4597667 (1986-07-01), Curby et al.

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