交流电磁场检测激励探头的试验研究

Incentive Coil Experimental Study of ACFM

在交流电磁场检测中,通有交流电的激励探头在被测工件(导体)表面产生感应电流,检测线圈对工件表面磁场的拾取从而判断缺陷的有无以及缺陷的特征。激励探头的优劣直接影响到缺陷处扰动磁场的大小,进而影响缺陷的检测。通过对感应电流均匀性、矩形载流线圈尺寸(磁芯长度、磁芯宽度)对感应电流分布的影响等进行仿真分析和对激励频率、激励线圈直径、激励线圈层数、激励线圈单层匝数与感应磁场之间的关系进行试验研究,为激励探头的优化设计提供理论依据和现实依据。

In ACFM,there is alternating current to pass incentive probe produce induced current at the surface of the measured workpiece（conductor）.Test coils on the surface magnetic field pickup and judge whether defects and defect characteristics.Incentive systems directly affect the size of the defect at the magnetic field disturbances,thereby affecting defect detection.Therefore,by ACFM systematic experimental study can optimize the power supply（current,frequency） and motivate probe（coil number of turns,core length,height） design.