Phase-locked loop laser gyroscope system

Details Phase-locked loop laser gyroscope system Phase-locked loop laser gyroscope system

1980-09-05

1983-11-15

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01C 1964

Patent

active

044152663

ABSTRACT:
A very high resolution laser gyroscope system having a phase-locked loop operatively coupled to the output of a laser gyroscope cavity. A difference frequency signal is formed between two output beams from the gyroscope cavity. The phase of the difference signal is compared with that of a reference clock to produce a signal representative of the phase difference between the reference clock and difference signal. The latter signal is amplified and coupled to a coil which produces a field within a Faraday rotator body disposed in the wave propagation path within the laser gyroscope cavity. The phase of the difference signal is thus phase-locked to that of the reference clock signal so that the frequency difference between the two beams in the cavity is maintained constant over a wide range of rates of rotation.

REFERENCES:
patent: 3469922 (1969-09-01), Coccoli et al.
patent: 3508831 (1970-04-01), Macek
patent: 3537027 (1970-10-01), Smith
patent: 3596201 (1971-07-01), Chester
patent: 3644841 (1972-02-01), Smith
patent: 3697181 (1972-10-01), Macek et al.
patent: 3741657 (1973-06-01), Andringa
patent: 3807866 (1974-04-01), Zingery
patent: 3846025 (1974-11-01), Wilber
patent: 3854819 (1974-12-01), Andringa
patent: 3892486 (1975-07-01), Ferrar

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