脉冲涡流检测中裂纹的深度定量及分类识别  

Quantification of depth and classification of cracks using pulsed eddy current test technology

作　　者：周德强[1] 张斌强[1] 田贵云[1,2] 王海涛[1] 

机构地区：[1]南京航空航天大学自动化学院,中国南京210016 [2]纽卡斯尔大学电子与计算机工程学院NE17RU英国

出　　处：《仪器仪表学报》2009年第6期1190-1194,共5页Chinese Journal of Scientific Instrument

摘　　要：脉冲涡流检测方法是涡流检测技术的一个新兴分支。设计了一套脉冲涡流检测系统,通过实验分析,可根据脉冲涡流信号输出峰值的变化判断裂纹的位置;根据脉冲涡流差分信号输出的峰值及峰值时间判定裂纹缺陷的深度信息。针对脉冲涡流在裂纹分类中存在识别正确率低的问题,提出了利用峰值及峰值时间两个主要特征值及主成分分析法对表面、亚表面及腐蚀裂纹进行了分类;通过比较两种识别方法,发现主成分分析法具有更好的分类性能,这为判定缺陷和建立缺陷特征库提供了一种有效的方法。Pulsed eddy current （PEC） test is a new development area of eddy current test technology. A pulsed eddy current system is designed. Through the experiments, the location of cracks can be determined by changes of the PEC signal peak. The crack depth information can be quantified according to the output peak value and the peak time of difference signal. With the purpose of overcoming the problem of low accuracy of PEC in the cracks classification, two main characteristic values including the peak value and the peak time and principal component analysis method are proposed to enhance the accuracy in classification of surface, subsurface and corrosion cracks. Compa- ring with two classification recognition methods, it is shown that the principal component analysis method has better classified performances. It provides an effective method for determining defect and establishing defect characteristic feature houses.

关 键 词：脉冲涡流 裂纹深度 裂纹分类 主成分分析 

分 类 号：TG115.28[金属学及工艺—物理冶金]