Ring laser gyroscope

About: Ring laser gyroscope is a research topic. Over the lifetime, 2070 publications have been published within this topic receiving 18609 citations. The topic is also known as: Sagnac interferometer.

Detection and analysis of the fiber optic gyroscope's random drift

Abstract: To apply the fiber optic gyroscope to the high-sensitivity domain presently, it is vital to restrain the fiber gyroscope's random drift. The properties of the fiber optic gyroscope's random drift are detected with the Allan variance method. The sources of some kinds of noise and its properties are analyzed. These noise restrain methods are presented.

Output optics detection system

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 reguired signal separation is performed fully electronically. In a preferred embodiment, signal separation circuitry is provided which performs a 90° 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 WA and WB. 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° or .pi./4 radians phase shift, as well as a 60° or .pi./3 radians phase shift. Complementary cavity length control schemes are presented in both fixed component and digitally controlled formats.

Reducing dither induced errors from path length control resets in a ring laser gyro

Abstract: An integrator in a ring laser gyro that produces an output for changing the path length is reset synchronously with a gyro dither signal to reduce gyro errors from the dithering operation during the reset