Ring laser gyroscope output optics detection system

Details Ring laser gyroscope output optics detection system Ring laser gyroscope output optics detection system

1990-01-12

1992-05-26

Wallace, Linda J.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01B 902

Patent

active

051161320

ABSTRACT:
A ring laser gyroscope output optics detection system, including a rotational sensing system and cavity length control system for a multioscillator ring laser gyroscope, is disclosed herein that can operate with a simple upright symmetric optics mechanism, where the required signal separation is performed fully electronically. In a preferred embodiment, signal separation circuitry is provided which performs a 90.degree. or .pi./2 radians phase shift to one of a set of heterodyned signals in order to extract the sagnac effect modulated Faraday frequency signals W.sub.A and W.sub.B. In order to deal with the inherent problems of crosstalk present in a Faraday biased system, alternative signal separation schemes suggest the use of a 45.degree. or .pi./4 radians phase shift, as well as a 60.degree. or .pi./3 radians phase shift. Complementary cavity length control schemes are presented in both fixed component and digitally controlled formats.

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Xicor-E.sup.2 POT.TM. Digitally Controlled Potentiometer.
National Semiconductor MICRO-DAC 1208, thru DAC 1210, DAC 1230 thru DAC 1232.

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