Ultrasonic TOFD Method for Near Surface Defect Detection Using Longitudinal Secondary Wave

摘要：

Aim at the problem of near surface blind area in ultrasonic TOFD technique, a new testing mode combined to ultrasound time of flight diffractionreflection(TOFDR) and the three-fold reflected(TOFDW) based on secondary longitudinal waves was put forward. Through analysis the transmission characteristics of TOFDR and TOFDW, the two modes of the detection principle were illustrated, and discussed the ability in near surface detection of the two methods. Finally through the detecting artificial defects detection, the signal and image characteristics and detection sensitivity under the modified detection mode were studied. The artificial defect with buried depth of lmm can be effectively detected from the D-scan image by the combined TOFDR and TOFDW methods.

关键词： Near surface blind area ultrasonic TOFD TOFDR TOFDW Defect detection

作者: Chao Lu Guo Chen Xin Wang

作者单位: Key Lab of Nondestructive Testing, Ministry of Education, Nanchang Hangkong University Fenghe South Road 696, 330063 Ncnchang, China

会议类型: 国际会议

会议名称: 2011 International Conference on Mechatronics and Applied Mechanics(2011年机电一体化与应用力学国际会议 ICMAM 2011)

会议地点: 香港

会议语种:英文

页码: 7-10

在线出版日期: 2011-12-27（万方平台首次上网日期，不代表论文的发表时间）