Sparse Array Ultrasonic Lamb Wave TDTE Imaging Method

• DOI: 10.1109/jsen.2021.3100615
• Publication Date: 2021-07-27T20:23:01Z
• Authors: Yao-Cheng; Wen-Fa Zhu; Xiao-Dong Chai; Liu-Jia Sun; Wei-Lv; Guo-Peng Fan; Shu-Bin Zheng; Hui-Zhang
• Keywords: Lamb waves

The current Lamb wave topology imaging methods are limited to the ideal model of through-hole defects, ignoring influence mode coupling. However, blind hole such as structural plate corrosion and cracks, most likely defects in practical applications, waves bound appear mode-coupled at these defects. use full matrix data calculations direct concomitant sound fields is time-consuming limits industrial application ultrasonic time-domain topological energy (TDTE) method. A TDTE method a sparse proposed this paper solve aforementioned two problems. array designed based on genetic algorithm, then field accompanying calculated using data. conversion considered when calculating field, reversed time so that adaptively focused defect. dispersion results overcome. Finally, values used pixel improve accuracy. experimental show for asymmetric more accurate than total focus (TFM) method; by algorithm has good sidelobe characteristics can effectively reduce noise assuming aperture unchanged. efficiency greatly improved compared with receiving four elements under condition ensuring quality.