单模光纤环热应力双折射仿真分析

Thermal Stress Birefringence Simulation of Single Mode Optic Fiber Loop

光纤陀螺在温度场作用下产生零位偏移,降低了光纤陀螺的精度。光纤环是光纤陀螺产生温度误差的主要根源。分析了温度场作用下,单模光纤环产生热应力双折射的机理。基于有限元方法仿真出光纤环在特定加热条件下的热应力双折射的大小及其随时间的变化。最后结合仿真结果提出了减小光纤环热应力双折射的几种方法,对提高光纤陀螺温度环境性能有较大的指导意义。

When Fiber Optic Gyroscope(FOG) is put under temperature environment,drift will occurs,which reduces the precision of the FOG.Theory of thermal stress birefringence of fiber loop for FOG under temperature environment is analyzed in detail.Thermal stress birefringence of fiber loop under the condition of heating is simulated using finite element method.Finally,based on simulation results,methods to reduce thermal stress birefringence are produced,which is important for improving the thermal environment performance of fiber optic gyroscope.