光纤陀螺热致漂移仿真分析及实验验证

Simulation Analysis and Experiment Verification of Fiber Optic Gyroscope Thermal Induced Drift

外界温度场作用下,光纤环温度变化和热应力是引起光纤陀螺非互易误差的主要原因。分析了光纤陀螺热致漂移的数学模型,基于该模型仿真研究了对光纤环以恒定功率加热随后转入平稳状态扰动因素下陀螺的输出特性。为验证模型准确性,选用3个光纤环搭建光纤陀螺系统,并对陀螺零偏变化特性进行了测试。测试结果表明,各陀螺零偏测试值与模型计算值间的误差不超过8%,实验结果与模型能够较好符合,该研究结果对高精度光纤陀螺的设计具有重要指导意义。

The non-reciprocal error in fiber optic gyroscope(FOG)is mainly caused by the temperature variation and thermal stress of the fiber optic ring under the external temperature field.The mathematical model of FOG thermal induced drift is analyzed.Based on this model,the output characteristics of the gyroscope are studied when the fiber optic ring is heated at constant power and then turned into a steady state disturbance factor.In order to verify the accuracy of the model,three fiber optic rings are selected to build a FOG system,and the characteristics of the gyroscope bias are tested.The results show that the error is less than 8%for three different FOGs,and the experiment results are in good agreement with the model.This result is of great significance to the design of high-precision FOG.