光纤陀螺光纤敏感线圈三维温度瞬态响应模型

Three-dimensional transient thermal modeling of FOG fiber coil

针对光纤敏感线圈的热致非互易相移问题,通过传热分析建立了光纤敏感线圈的三维温度瞬态响应模型。利用该温度瞬态响应模型全面分析了三维坐标下的温度梯度造成的热致非互易效应;结合光纤陀螺实际的工作环境,利用仿真对四极对称绕法的光纤环进行了分析,获取了温度激励造成的热致速率误差。通过温度模型计算的热致误差速率与温箱中光纤陀螺稳测数据的极差为0.48(°)/h,计算结果验证了光纤敏感线圈三维温度瞬态响应模型的有效性。利用该模型可有效指导光纤环热结构参数的设计,从而抑制光纤环的Shupe误差,提高光纤陀螺的温度性能。

To solve the problems of thermally induced nonreciprocal phase-shift in fiber coil,a threedimensional temperature transient thermal model was established through thermal analysis.Under the actual working environment of fiber optic gyroscope（FOG）,the temperature transient response model was used to analyze the thermally induced nonreciprocity caused by three-dimensional temperature gradient.Numerical simulations were carried out on the quadruple winding pattern fiber coil to obtain the velocity errors caused by temperature gradient.The calculation results from the FOG experimental data in incubator show that the maximum difference between the tested velocity error and the model calculated data is 0.48（°）/h,which verify the effectiveness of three-dimensional temperature transient response fiber coil model.This model could provide reference for the design of fiber coil thermal structure parameters,hence reduce the Shupe error of fiber coil and improve the FOG’s temperature performance.