Multioscillator ring laser gyro output information processing sy

Details Multioscillator ring laser gyro output information processing sy Multioscillator ring laser gyro output information processing sy

1977-02-09

1978-10-31

McGraw, Vincent P.

Optics: measuring and testing

Refraction testing

Prism engaging specimen

G01B 902, G01P 900

Patent

active

041231627

ABSTRACT:
A four mode ring laser gyro has its four modes at different frequencies combined and applied to a single photo diode. The output from the photo diode is applied to a non-linear device, and the resultant sum and difference frequencies are applied to (1) a laser cavity length control circuit, (2) a rotation rate detection circuit, and (3) a rotation direction determination circuit. The cavity length control circuit operates by the determination of 100% modulation of one of the beat frequencies by a second one. The direction determination circuit utilizes the phase of an AC dithering power supply which varies the anode to cathode plasma current of the laser gyro.

REFERENCES:
patent: 3937578 (1976-02-01), Andringa

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