摘要
回顾了超声TOFD检测方法,分析了超声TOFD近表面盲区的形成原因和3种改善近表面检测盲区的方法,包括TOFDW、S-TOFD以及基于希尔伯特黄变换的缺陷信号处理方法,并进行了典型的检测试验分析。利用TOFDW方法,TOFD表面检测盲区可达2mm。
The ultrasonic TOFD （time-of-flight diffraction） method is reviewed, then the reasons of dead zone nearby surface is analyzed.Three methods including TOFDW, S-TOFD and signal processing based on Hilbert- Huang transform are introduced. Furthermore, practical experimental results are presented and analysed. TOFD dead zone can be reduced to 2mm near upper surface by TOFDW.
出处
《航空制造技术》
北大核心
2014年第20期87-90,共4页
Aeronautical Manufacturing Technology
