Balanced dual servo VCO passive ring laser gyroscope

Details Balanced dual servo VCO passive ring laser gyroscope Balanced dual servo VCO passive ring laser gyroscope

1987-05-01

1989-05-16

Buczinski, Stephen C.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01B 902

Patent

active

048304956

ABSTRACT:
A passive ring resonator gyroscope comprising a single piece body having an integral first and second resonator cavity. The first resonator cavity contains a single frequency laser means to provide a sharply tuned single frequency light source to the second resonator cavity. The single frequency light source is sharply tuned and is split to form first and second sources. The second resonator cavity is a passive high Q cavity having a closed second optical path. The two light sources are fed to the second resonator and propagate as CW and CCW beams within the second resonator. A first servo channel tunes the frequency of the CW beam to a resonance peak. A second servo channel tunes the CCW beam to its resonance peak. By converting both servo error outputs into frequency, the relative frequency difference between the CW and CCW beams are recorded as the frequency shift in response to the body rate rotation about the sensitive axis. The first and second control signals are algebraicly added to provide a passive cavity path length difference servo signal which is integrated. A SECOND ADDER adds the integrated passive cavity difference signal to the reference signal (Fm) to provide the passive cavity path length servo signal to a passive cavity path length adjusting means for constantly adjusting the passive cavity path length servo signal to keep the passive cavity at peak resonance at a frequency substantially mid-range between the propagating (FCW) and the counterpropagating beams (FCCW).

REFERENCES:
patent: 4135822 (1979-01-01), Ezekiel
patent: 4429573 (1984-02-01), Walker
patent: 4673293 (1987-06-01), Sanders
S. Ezekiel and S. R. Balsamo, "Passive Ring Resonator Laser Gyroscope", Applied Physics Letters, vol. 30, No. 9, May 1, 1977, pp. 478-480.

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