基于有限元仿真电涡流传感器的结构优化

Structure optimization of eddy current sensor based on the finite element simulation

传感器性能受线圈形状及其几何参数影响。为优化传感器性能,运用COMSOL Multiphysics建立了有限元仿真模型。通过有限元数值仿真分析,研究了传感器的结构,优化并实验验证了有限元模型的合理性。通过有限元仿真分析发现双正交矩形柱型传感器比单正交矩形柱型传感器具有更高的检测灵敏度。此外,进一步研究分析了在线圈匝数密度不变情况下,双正交矩形柱型传感器辅助线圈厚度、外形状系数、内形状系数、激励电流、外形状比例系数对其检测灵敏度的影响,为合理选择线圈参数提高传感器性能提供参考。

The performance of sensor is affected by the shape and the geometric parameters of coil .In order to optimize the detection performance of sensor ,finite element model was established in the COMSOL Multiphysics .Simulation analysis on the structural optimization of sensor was conducted ,and verified by the experiments .The biorthogonal rectangular sensor was found to have higher detection sensitivity comparing with the single orthogonal rectangular sensor .Otherwise ,the effects of thickness ,external shape coefficient ,internal shape coefficient ,excitation current , external shape proportionality coefficient of the auxiliary coil on detection sensitivity of sensor were investigated under the case of a fixed coil turn density .The conclusions from the study provide a reference for the determining of the coil parameters and the improvement of the sensor performance .