光纤陀螺光纤环Shupe效应的三维有限元模型

Three-Dimensional Finite Element Model of Shupe Effect in FOG Fiber Coil

针对传统二维热致非互易光纤环模型的局限性,建立了光纤环柱面坐标三维计算模型,可分析光纤环径向、轴向和周向温度不均匀变化导致的热致误差速率和热致误差角度.采用有限元方法对光纤环三维物理模型进行数值仿真,定量分析由温度激励造成的热致误差速率和热致误差角度.开展了光纤环温度激励实验,对比仿真和实验结果,验证了光纤环三维物理模型的有效性.并将光纤环三维计算模型成功地应用于光纤陀螺(FOG)纤环瞬态特性检测方法所用的温度激励源设计.

To overcome the limitations of the traditional two-dimensional thermal induced nonreciprocity fiber coil model, we developed a computational three-dimensional （ 3-D ） fiber coil model to describe rate and angular error generation through dynamically changing thermal inhomogeneities along the radial, axial and circumferential direc- tions in the fiber coil. With finite element analysis, numerical simulations were carded out to quantitatively analyze the rate and angular error induced by temperature excitation. We then validated the 3-D model by comparing numerical and experimental results. Moreover, the computational 3-D fiber coil model was successfully applied to the design of temperature excitation device used in the transient characteristic testing method of fiber optic gyroscope （ FOG ） fiber coil.