基于TMR传感器的脉冲涡流C扫描成像技术研究  

Research on pulsed eddy current C-scan imaging technology based on TMR sensor

作　　者：李兴邦 叶志浩[1] 罗宁昭[1] 李绍利 张尧 Li Xingbang;Ye Zhihao;Luo Ningzhao;Li Shaoli;Zhang Yao(College of Electrical Engineering,Navy University of Engineering,Wuhan 430033,China;Hefei Boe Zhuoyin Technology Co.,Ltd.,Hefei 230011,China)

机构地区：[1]海军工程大学电气工程学院,武汉430033 [2]合肥京东方卓印科技有限公司,合肥230011

出　　处：《电子测量与仪器学报》2022年第8期105-113,共9页Journal of Electronic Measurement and Instrumentation

摘　　要：针对直线结构的阵列探针存在探针越远离线圈内径位置,存在相同位置缺陷的差分信号峰值越小的问题,提出了基于TMR传感器在同一激励线圈内半圆弧“等横向间距”布置的方法,并设计了一款新型脉冲涡流C扫描成像装置。研究结果表明,对于铜板不同形状的缺陷,通过C扫描并对扫描结果进行折算和阈值分割后绘制的等高线图能够很好地复现缺陷的形状,成功实现了铜板不同形状缺陷的二维成像,进而验证了该方法的有效性和可行性。There’s an existing problem on linear structure that, the farther the array probe is located on coil’s inner diameter, the smaller is the peak of differential signal of the same position defect. Aiming at solving this problem, this paper put forward an approach of placing the TMR sensor in the shape of semicircle with same horizontal spacing within the same excitation coil, and designed a new type of pulse vortex C-scanning imaging device. The findings suggest that, contour maps drawn after C-scanning and the conversion and threshold segmentation of scanning results could well reshape different forms of cavities on copper plate and successfully gained the 2D images of them, thus proving the effectiveness and feasibility of this approach.

关 键 词：TMR传感器 脉冲涡流 铜板 缺陷检测 C扫描成像 

分 类 号：TM937.2[电气工程—电力电子与电力传动] TH862[机械工程—仪器科学与技术]