脉冲涡流矩形差分探头缺陷检测机理

摘要/Abstract

摘要： 为了进一步提升脉冲涡流的缺陷检测能力，提出了脉冲涡流矩形差分探头的检测方法。建立了脉冲涡流矩形探头的三维检测模型，分析了矩形线圈激励时试件上感应电流的分布，比较了铁磁性材料和非铁磁性材料的试件表面涡流方向和值的大小。根据试件上涡流X分量和Y分量呈对称分布的特性，提出了两种金属材料的脉冲涡流矩形差分探头设计方法。制作了相应的脉冲涡流矩形差分探头来获取磁场分量，仿真与实验结果表明，对于铁磁性材料和非铁磁性材料缺陷检测，脉冲涡流矩形差分探头测量的磁场X分量、Y分量比Z分量检测灵敏度更高。

关键词: 矩形差分探头, 脉冲涡流, 铁磁性的, 非铁磁性的

Abstract: To further improve the detectability of defects of pulsed eddy current testing (PECT), the methods of rectangular differential probes of PEC were put forward. A three-dimensional testing model of the PEC rectangular probes was established, and the distribution of induced current on samples under a rectangular testing coil was analyzed. The distribution and value of induced current were compared between ferromagnetic and non-ferromagnetic materials. According to the symmetric distribution of X and Y components, two design methods of metals for PEC rectangular probes were put forward. The relative differential rectangular probes of PEC were designed to obtain different magnetic components. The simulation and experimental results show that X and Y components of magnetic fields may lead higher testing sensitivity than Z component for the ferromagnetic and non-ferromagnetic materials respectively.

Key words: rectangular differential probe, pulsed eddy current(PEC), ferromagnetic, non-ferromagnetic

中图分类号:

TG115.28

周德强, 王俊, 潘萌, 李可, 宿磊, 化春键. 脉冲涡流矩形差分探头缺陷检测机理[J]. 中国机械工程.

Zhou Deqiang, Wang Jun, Pan Meng, Li Ke, Su Lei, Hua Chunjian. Mechanism of Defect Detections for Rectangular Differential Probes of Pulsed Eddy Current Testing[J]. China Mechanical Engineering.

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