文献类型：期刊文献

英文题名：Enhanced total focus method for imaging heterogeneous metal bonded structures

作者：Liu, Wen[1]; Liu, Lishuai[1]; Wu, Wangsong[2]; Xiang, Yanxun[1]; Xuan, Fu-Zhen[1]

机构：[1] East China University Of Science And Technology, Shanghai Key Laboratory Of Intelligent Sensing And Detection Technology, School Of Mechanical And Power Engineering, Shanghai, China; [2] China Southern Power Grid Co., Ltd., Electric Power Research Institute, China

年份：2024

起止页码：190

外文期刊名：Proceedings of 2024 IEEE Far East NDT New Technology and Application Forum, FENDT 2024

收录：EI(收录号：20253118909788)

语种：英文

外文关键词：Iterative methods - Medical imaging - Nondestructive examination - Refraction - Ultrasonic imaging - Virtual reality

摘要：The homogeneous media-based total focus method (TFM) has been applied to the nondestructive testing of various industrial components in recent years. However, this technique is inaccurate and inefficient for multilayer medium. To address this problem, this paper proposes an improved multilayer structural ultrasound imaging algorithm based on the Fermat principle. The algorithm linearly interpolates a series of virtual refraction points to the geometrical positions of the transducer elements and the imaging pixel points, determines the delay by calculating the minimum propagation time in all the virtual paths, and applies the calculated delay law to reconstruct the structural image. This method avoids the traditional iterative solution process of delay calculation based on Snell's law, and has good imaging efficiency. The imaging results show that the proposed method can image single or multiple defects in heterogeneous metal bonded structures well. ? 2024 IEEE.