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激光陀螺变锁区现象的研究与讨论
Research and discussion on the lock-in threshold variation of ring laser gyro
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摘要: 通过采用减低转速的办法测得的锁区值推算出的随机游走比用Allan方差方法拟合的随机游走要大很多．为了解释这一问题，建立了动态刻蚀光栅模型，与以往的研究不同，本文认为刻蚀光栅效应不只在驻波状态下发生，在行波状态下也会存在，而且与拍频频率呈现动态响应的关系．这种模型得出了锁区随着转速的降低而不断增大的结论，解释了长期以来困扰激光陀螺研究者的～些问题．Abstract: The lock-in threshold can be obtained by reducing the rotation rate. The lock-in threshold obtained using this method is incon- sistent with the angle random walk derived from Allan variance. A dynamic burn-in grating model is proposed. The burn-in effect happens in the mirror not only in the standing wave state, but also in the traveling wave state, and it responds dynamically to beat frequency, which is different from previous research results. It can be derived that the lock-in threshold increases with the decrease of rotation rate for this model, and many puzzling phenomena of the ring laser gyro can be explained.
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