采用有限元分析法,分析棱镜式激光陀螺在光胶区存在划痕条件下及在变温过程中,光胶表面残余应力的产生和放大情况。以熔融石英材料介电张量随应力的变化为出发点,分析应力与陀螺测量值之间的关系。分析结果表明:光胶区划痕产生的应力将在数倍划痕宽度的区域内产生影响,应力造成激光陀螺内振荡光频率分裂及偏振态改变,陀螺闭锁阈值升高,进而影响陀螺的测试精度和工作稳定性。通过陀螺变温测试实验,检测地球自转角速度的天向分量,利用合光光斑形貌和精度曲线稳定性验证理论研究的正确性。

By taking the prism laser gyroscope as the research object and using the finite element analysis method, the problems of the generation and amplification of the residual stress are studied in temperature variation process under the condition of existing scratch on the surface of optical cement. Based on the change of the fused silica's dielectric tensor with stress, the relationship between the stress and gyroscope measurement value is analyzed. The analysis results show that the micro scratch on the optical cement region produces the residual stress in the area whose size is several times of the scratch width, and the frequency division and polarization change are caused. The lock-in threshold of the gyroscope increases, the test precision of the gyroscope and working stability are affected. Finally, by variable temperature experiment, the gyroscope detects the normal angular velocity component of the Earth's rotation, and the combined light spot morphology and precision curve stability are used to verify the correctness of the theoretical analysis.