光纤陀螺温度场分析及结构优化设计

从导热微分方程出发,建立了光纤陀螺温度场有限元模型,对模型进行了稳态温度场和瞬态温度场仿真分析。利用铂电阻测温电路对仿真结果进行实验验证,两者相对误差小于3%,证明仿真分析的结果是正确和有效的。针对光纤环温度场分布不均匀的情况,对光纤陀螺结构进行了优化设计。光纤陀螺在25℃环境中稳定工作时,稳态温度场分析结果表明,优化设计后光纤环最高与最低温度差为0.05℃,较优化前的0.19℃减小了73.7%;将陀螺置于60℃环境且处于非开机状态时,10min瞬态温度场分析结果表明,优化设计后光纤环最高与最低温度相差0.11℃,较优化前的0.19℃减小了42.1%。

Temperature field analysis and structure redesign of fiber optic gyroscope

Based on partial differential equation of heat conduction, a temperature field model of fiber optic gyroscope (FOG) is established. The steady-state temperature field and the transient temperature field are given. A circuit to measure temperature using a platinum resistor is designed. The experiment results are compared with simulated ones and the error is less than 3%, which validates the legitimacy of the simulation. The structure of FOG is redesigned to improve the thermal symmetry of the fiber ring. The steady-state temperature field indicates that the temperature difference of the fiber ring is reduced 73.7 percent to 0.05 degree after structure redesign. The transient temperature field in 10 min shows that the temperature difference of the fiber ring is reduced 42.1 percent to 0.11 degree after structure redesign.