非铁磁性金属材料脉冲涡流测厚探头参数的仿真分析

Simulation and analysis of the parameters of pulse eddy current thickness probe for nonferromagnetic metals

目的:研究探头参数对非铁磁性金属材料脉冲涡流测厚的影响。方法:利用ANSYS仿真软件建立模型,提取检测线圈上的电压值,将差分信号峰值变化与壁厚变化的比值定义为测厚灵敏度,以灵敏度为评价指标对探头参数进行分析。结果:对激励线圈以及磁芯的尺寸参数分别建立了以2 mm为步进的38～50 mm壁厚的仿真模型,求出了各激励线圈高度、宽度和内径以及磁芯尺寸参数下脉冲涡流测厚的灵敏度。结论:激励线圈的内径越大、宽度越宽、高度越小,脉冲涡流测厚的灵敏度越高。

Aims:This paper studies the influence of probe parameters on pulse eddy current thickness measurement of non-ferromagnetic metal materials.Methods:The ANSYS simulation software was used to establish the model to extract the voltage value on the detection coil,define the ratio of peak value change of differential signal to wall thickness change as thickness sensitivity,and analyze the probe parameters with sensitivity as evaluation index.Results:For the size parameters of the excitation coil and the magnetic core,the simulation models of the wall thickness of the excitation coil with a step of2 mm were established.The sensitivity of pulse eddy current thickness measurement under the height,width and inner diameter of the excitation coil and the size parameters of the magnetic core were obtained.Conclusions:The greater the inner diameter,the wider the width and the smaller the height of the excitation coil,the higher the sensitivity of pulse eddy current thickness measurement.