激光陀螺腔体材料的导热系数低,环境温度改变时,外界热量传入腔体内部过程中存在热弛豫。在陀螺温度循环实验中,热弛豫导致稳频控制系统参数偏离理想值,影响了陀螺精度。采用有限元分析法模拟-40 ℃→70 ℃实验过程中陀螺温度场分布情况。根据模拟结果,数学拟合腔体内、外层温度差与测试时间的函数关系。结合棱镜式激光陀螺稳频伺服系统的控制特征,计算出不同温度段下稳频系统的理想控制参数。利用数字电路技术实现了对棱镜式激光陀螺的分温度段、分参数稳频控制,实验证明陀螺精度有一定的提高。

Laser gyroscope cavity materials exhibit low thermal conductivity. When the ambient temperature changes, a thermal relaxation occurs when the external heat enters the cavity. In the gyroscope temperature cycling experiment, the parameters of the frequency stabilization control system are deviated from the ideal values owing to thermal relaxation, affecting the accuracy of the gyroscope. In this study, the finite element analysis method is used to simulate the temperature field distribution of the gyroscope from -40 ℃ to 70 ℃. According to the simulation results, the functions of the temperature difference between the inner and outer of the cavity and time is mathematically fitted. Based on the control characteristic of the prism laser gyroscope frequency stabilization servo system, the ideal control parameters of the frequency stabilization system under different temperature ranges are calculated. By the temperature-dependent digital frequency stabilization control in the prism laser gyroscope, the control parameters are changed in real time, and the experiments show an improved precision of gyroscope.