Study On The Influence Of Temperature And Machining Error On Scale Factor Of Total Reflection Prism Laser Gyro

As the core instalment of strapdown inertial navigation system(SINS), laser gyro has found its great applications and attracted explosive attentions from both industry and academia recently. With high reflectivity, low backscattering characteristics, the total reflection prism laser gyroscope(TRPLG) will get more and more market share of laser gyro.In this paper, the effect of temperature variation and machining error on scale factor stability of a laser gyro is studied. Firstly, the temperature distribution in the quartz prism of the laser is simulated by using the finite element software ANSYS. Then the light beam path deviation of the total reflection prism laser depend on the temperature variation and machining error is computed based on light beam’s self-consistent theory and transmission matrix of the laser, Finally the relative errors of scale factor of the gyro caused by the area change of ring optical path and the optic length in the laser resulted from the optic path deviation is calculated, A MATLAB-based simulation platform is designed for analyzing the relative errors on scale factor caused by both temperature variation and machining error.