基于GMFM的脉冲涡流检测亚表面腐蚀缺陷成像技术  

Research of Pulsed Eddy Current Testing for Defect Imaging Based on Gradient Magnetic Field Measurement

作　　者：齐勇[1,2] 李勇[1] 刘相彪[1] 陈振茂[1] 赵宏达[1] 

机构地区：[1]西安交通大学航天航空学院,机械结构强度与振动国家重点实验室 [2]94354部队

出　　处：《空军工程大学学报（自然科学版）》2013年第5期63-66,94,共5页Journal of Air Force Engineering University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51007069)

摘　　要：将磁场梯度测量技术和脉冲涡流检测技术有效融合,集中探究基于脉冲涡流磁场梯度信号的亚表面腐蚀缺陷成像手段及其优势性。首先,采用三维有限元仿真分析了脉冲涡流磁场梯度信号在亚表面腐蚀缺陷成像中的有效性和优势性,模拟仿真结果显示磁场梯度信号对于缺陷边缘的检测具有优势。基于模拟仿真结果,搭建了一套脉冲涡流检测实验系统,通过成像实验比较了基于两类信号的亚表面腐蚀缺陷扫描结果,并进一步研究了该类缺陷的成像技术。成像结果表明采用磁场梯度信号可实现对缺陷边缘的高效成像,基于磁场梯度测量的脉冲涡流检测技术较传统脉冲涡流检测技术,具有高效、高灵敏度的优势。PECT is widely used in aviation,nuclear power,etc.In this paper,PECT integrated with Gradient Magnetic Field Measurement(GMFM)is proposed particularly for imaging of hidden corrosion in this paper.Simulation results indicate that GMFM is advantageous in detection of defect edges,which has potential benefit for defect imaging.A PECT system has been built.Signals are obtained when the PECT probe scans over a hidden corrosion,and defect images are derived in post processing.It has been found from the experimental results that the GMFM-based PECT has advantages over conventional PECT in terms of high sensitivity and efficiency in defect imaging of hidden corrosion.

关 键 词：电磁无损检测 磁场梯度测量技术 脉冲涡流检测技术 缺陷成像 亚表面腐蚀缺陷 

分 类 号：TG115.28[金属学及工艺—物理冶金]