摘要
针对超声TOFD技术在薄板焊缝检测中盲区过大的问题,利用小波匹配追踪技术对信号中适合的子带进行数据匹配追踪稀疏化处理,研发的检测软件探索并解决了超声TOFD技术图像上表面缺陷信号的混叠问题.在带缺陷的薄板焊接试件上进行试验,通过对检出数据的对比分析,验证了小波匹配追踪技术在减小盲区上的优良效果.
In order to solve the problem that ultrasonic TOFD technique has too large blind area in thin board welding seam detection,a novel detection software is developed by data matching,tracking and sparse processing on suitable sub-bands in signal with wavelet matching pursuit technique.The software is proposed to explore the solution of near surface defect signal aliasing in ultrasonic TOFD technique image.With testing on welded specimens with defects,the excellent effect of wavelet matching pursuit technique in reducing blind area is verified by comprehensive analysis of detection data.
出处
《杭州电子科技大学学报（自然科学版）》
2016年第5期26-30,46,共6页
Journal of Hangzhou Dianzi University：Natural Sciences
基金
国家自然科学基金资助项目(51175465)
浙江省质量技术监督局科技研究资助项目(20130292)
关键词
超声TOFD
小波匹配追踪技术
纵向分辨率
盲区
ultrasonic TOFD
wavelet matching pursuit technique
vertical resolution
blindarea
