PHASE-LOCKED LASER GYROSCOPE SYSTEM

摘要

PHASE-LOCKED LOOP LASER GYROSCOPE SYSTEM 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 phaselocked 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.