基于磁通门磁强计平行分量法的深层涡流检测  

Deep-Lying Eddy Current Testing Based on Measuring the Parallel Component of the Flux-Gate Magnetometer

作　　者：刘政豪[1] 朱康伟[1] 张玮 雷代富[1] 王斗 LIU Zhenghao;ZHU Kangwei;ZHANG Wei;LEI Daifu;WANG Dou(Institute of Materials,China Academy of Engineering Physics,Jiangyou 621908,China)

机构地区：[1]中国工程物理研究院材料研究所,江油621908

出　　处：《无损检测》2018年第9期8-13,共6页Nondestructive Testing

摘　　要：采用磁场平行分量法,用磁通门磁强计进行深层涡流检测,该方法通过测量方向与本底磁场垂直的涡流磁场平行分量的方式,能有效避免较强的本底磁场干扰,并能清晰分辨线缺陷与十字形缺陷的特征,对多层铝板的检测深度至少达到14mm,并发现十字形缺陷的涡流磁场信号幅度比线缺陷的涡流磁场信号幅度更强,且随着缺陷深度的增加,其信号幅度衰减速率更慢。The flux-gate magnetometer is used to measure the parallel component of the magnetic field of the deep-lying eddy current,which can avoid the influence of the exciting coil when the central magnetic field of the exciting coil is perpendicular to the measurement direction.This method could distinguish line defect and cross defect clearly,and the detection depth of multi-layer Al plates was as high as 14 mm.It was found that the amplitude of the eddy current magnetic field signal of cross defect was greater than line defect,and it decreased slower when the depth of the defect was increasing.

关 键 词：涡流检测 深层缺陷 磁通门磁强计 

分 类 号：O441.5[理学—电磁学] TG115.28[理学—物理]