锁区对速率偏频激光陀螺的性能有重要影响, 而高精度的锁区测量依然是一个难题。从激光陀螺闭锁方程出发, 通过理论近似的方法得到了锁区与激光陀螺输出信号谐波的近似关系。在此基础上提出了一种激光陀螺锁区的谐波测量方法, 进而通过闭锁方程的严格数值解进行了修正和误差分析。最后利用谐波测量法测量了某一激光陀螺的锁区大小, 结果表明精度能够优于5%。

Lock-in is important to rate-biased laser gyro, but accurate lock-in measurement is always difficult. According to lock-in equation of laser gyro, approximate relation of lock-in and laser gyro output signal harmonic is derived from theoretical approximation, and based on this approximate relation the harmonic measurement for laser gyro lock-in is provided. Modification and errors analysis are processed through accurate numerical result of lock-in equation. Finally lock-in value of a laser gyro is measured by harmonic method, and the result shows that the measurement accuracy can be better than 5%.