Digital path length control for ring laser gyros

Details Digital path length control for ring laser gyros Digital path length control for ring laser gyros

1990-04-11

1992-04-28

Turner, Samuel

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01C 1966

Patent

active

051081822

ABSTRACT:
A digital path length control for ring laser gyros comprises a square wave generator, a dither counter (driven by the generator with a quarter cycle delay, a dither DAC, a control counter, a control DAC, and a PZT driven by the two DACs. The PZT controls the path length of the ring laser gyro, and thus controls the intensity of the light in the gyro. A photodetector samples this light and produces an ac signal, which a voltage comparator compares with ground. The output of the comparator is XORed with the square wave, and the output of the XOR gate drives the control counter, strobed with a frequency at least twice that of the square wave. All signal processing is digital, and analog conversion is made only when interfacing the gyro.

REFERENCES:
patent: 3715562 (1973-02-01), Dendy et al.
patent: 3896362 (1975-07-01), Street
patent: 4132940 (1979-01-01), Schindler
patent: 4320974 (1982-03-01), Ljung
patent: 4740083 (1988-04-01), Curby et al.
patent: 4740085 (1988-04-01), Lim
patent: 4801206 (1989-01-01), Benoist

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