摘要
提出一种新型脉冲涡流检测技术,将广泛应用于医学核磁共振成像、超导量子干涉仪的磁场梯度测量技术引入到脉冲涡流检测技术中,以提高脉冲涡流检测金属构件表面缺陷灵敏度。通过仿真和试验,着重分析了脉冲涡流检测表面裂纹的扫描结果。研究发现,磁场梯度信号较磁场差分信号具有更高的检测灵敏度,验证了所提出技术的有效性。
This paper proposed a new PECT technique by introducing GMFM which was intensive- ly used in magnetic resonance imaging （MRI） and superconducting quantum interference devices （SQUID） to PECT in an effort to enhance the PECT sensitivity to surface cracks. The scanning re- suits regarding PECT evaluation of surface cracks were intensively analyzed via simulations and exper- iments. It is found that the GMFM signals have higher sensitivity than that of the conventional PECT differential signals in evaluation of surface cracks, which verifies the validity of the proposed method.
出处
《中国机械工程》
EI
CAS
CSCD
北大核心
2014年第8期1108-1112,1135,共6页
China Mechanical Engineering
基金
国家自然科学基金资助项目(51007069/E070104)
关键词
电磁无损检测
脉冲涡流检测
磁场梯度测量技术
表面裂纹
electromagnetic nondestructive testing and evaluation
pulsed eddy current testing （PECT）
gradient magnetic field measurement （GMFM）
surface crack
