Optical dither in laser gyro and its influence on lock-in
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摘要: 为了提高激光陀螺的性能，提出利用光学抖动改善陀螺锁区的方法。研究了环形光路中背向散射对锁区的影响，理想状态下可以消除陀螺的零阶锁区。在微扰条件下对光学抖动下陀螺腔内的光路变化进行了分析计算，得到了使陀螺锁区达到最佳改善的理论光学抖动量并进行了实验研究。实验结果表明：光学抖动可以起到类似机械抖动加噪的效果，改善陀螺的零偏稳定性。Abstract: Optical dither is introduced to improve lock-in for better performance of laser gyro. The influence of the back-scatter light on the lock-in of laser gyro was investigated, and the basic principle of back-scatter reduction and lock-in improvement with optical dither was expounded. Optical path variation under optical dithering was carried out by perturbation and the best theoretical amplitude of optical dither for lock-in was deduced. The experiments were done according to the concept. The result showed that the effect of optical dither was similar to mechanically dithered noise, which could improve the bias stability of gyro. Therefore, optical dither is suitable for laser gyro to improve the lock-in.
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Keywords:
- optical measurement /
- laser gyro /
- lock-in /
- optical dithering
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