光纤环瞬态温度梯度对Shupe误差的影响

Effects of Temporal Thermal Gradient on the Shupe Error of Fiber Coil

光纤陀螺的承环结构不同,会影响光纤环的温度及温度梯度分布,进而影响陀螺的精度。对四种不同承环结构的光纤陀螺进行有限元瞬态热仿真,得到光纤环的温度分布。基于四极对称绕法绕制光纤环的截面数字离散化模型,绘制了四个光纤环沿展开光纤上的温度分布,计算了四个陀螺的轴向和径向温度梯度及其引起的Shupe误差。对比分析结果表明:承环结构形式不同,光纤环的轴向和径向温度梯度不同,轴向温度梯度对光纤环的Shupe误差影响更大。

Optomechanical structure of fiber optic gyro(FOG) may affect thermal gradients distribution of fiber coil,which influence the precision of fog.Finite element models of four FOGs with different kinds of configurations were set up and temporal thermal simulation was done,through which we got the temperature distribution of fiber optic rings.According to digital discrete model of fiber ring cross section,the temperature curves along the fiber length were plotted.Then we computed the Shupe errors caused by radial thermal gradient(RTG) and axial thermal gradient(ATG).The results show that different kinds of optomechanical structures affect the ATG and RTG,the former has greater influence on the Shupe error of the quadrupoar winding fiber coil.