管道轴向裂纹检测脉冲远场涡流传感器设计与仿真分析

Simulation Research on Design of Pulsed Remote Field Eddy Current Sensor for Axial Crack Detection in Pipeline

脉冲远场涡流检测方法结合了脉冲检测频率丰富以及远场方法适于铁磁性管道检测的优势,因此文中采用脉冲远场技术对管道轴向裂纹进行了检测。首先分析了脉冲远场涡流的检测原理,通过提取感应电压信号的负峰值和过零时间作为特征量可以分析管道的检测信息,在此基础上设计了4种不同结构的传感器模型,比较了4种模型过渡区的远近、对轴向裂纹检测灵敏度的高低以及对不同壁厚管道检测的结果。仿真结果表明:与其它模型相比,连通激励磁路的传感器模型具有更好的检测效果。

Pulsed remote field eddy current（PRFEC） technique integrates the advantages of richness frequency components of pulsed eddy current testing and remote field technique adapt to inspect ferromagnetic pipeline,which is used for detecting axial crack in pipelines.In this paper the principle of PRFEC is analyzed,four sensor models of different structures are designed,the detection effects of pipeline by four sensor models are simulated,the distance of transition field and the detection sensitivity for axial crack and the detection result of pipelines of various wall thicknesses are studied.The result of simulation shows that the model with the core connected through the exciting coil has the better testing ability.