一种激光陀螺闭锁阈值的测试方法研究

摘要

Lock-in effect is the most important error of ring laser gyro(RLG),which is mainly derived from backscat-ter of optical path. In this paper,the expression of beam intensity and frequency difference through analyzing the self-con-sistent filed equations are given and a new measurement method of lock-in threshold is established. Meanwhile, a new measurement system also established according to this method and compared the testing threshold with the traditional method which measure lock-in by decelerating velocity of gyro rotation gradually. The results show that the measurement re-sults obtained by the new method have a better agreement with RLG testing accuracy. It is of great significance to predict and analyze the performance of RLG.%闭锁效应是二频机抖激光陀螺的最重要误差,其主要来源于光路中的背向散射.通过对自洽场方程组的分析,给出了光强与频差的表达式,继而得到一种新的闭锁阈值测试方法.通过搭建相关测试系统,并对比传统的转台渐进降速测试的闭锁阈值,结果表明新方法得到的测试值与陀螺实测精度具有更好的吻合性,这对预估和分析激光陀螺性能具有较好的指导意义.