Phase-locked laser gyroscope system

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

G - Physics

01

C

345/10

G01C 19/64 (2006.01) G01C 19/66 (2006.01)

Patent

CA 1132692

PHASE-LOCKED LOOP LASER GYROSCOPE SYSTEM 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.

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