文献类型：期刊文献

英文题名：Broadband ultrasonic lamb wave phased array imaging

作者：Li, Xuan[1];Liu, Lishuai[1,2];Hu, Zheng[1];Xiang, Yanxun[1];Xuan, Fu-Zhen[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai Key Lab Intelligent Sensing & Detect Tech, Shanghai 200237, Peoples R China;[2]Shanghai Inst Aircraft Mech & Control, Shanghai 200092, Peoples R China

年份：2025

卷号：239

外文期刊名：MECHANICAL SYSTEMS AND SIGNAL PROCESSING

收录：;EI(收录号：20253619093633);WOS:【SCI-EXPANDED(收录号:WOS:001565443600007)】；

基金：This work was supported by the National Natural Science Foundation of China (Grant Nos. 12327807, 12422415, 12374434, and 52321002) and the Shanghai Science and Technology Innovation Action Plan (No. 24TS1412200 and 24ZR1490900) .

语种：英文

外文关键词：Lamb wave phased array; Time-reversal; Chirp excitation; Time-domain topological energy; Defects imaging

摘要：Broadband Lamb wave phased array imaging by total focusing method (TFM) and pulse compression can effectively improve imaging performance with respect to narrowband excitation, attracting widespread attention. This paper proposes a broadband Lamb wave phased array imaging method based on time-reversal of long-time pulse echoes, where the damage index is derived from the combined contribution of all frequency components. The broadband delay and sum (DAS) beamforming formula is derived for broadband phased array beamforming analysis. Based on the strategy of time-reversal refocusing, the broadband Time-domain topological energy (TDTE) imaging method is developed for dispersion compensation and broadband imaging of long-time pulse echoes, breaking through the insufficient spatial resolution of TFM under longtime signal excitation. The validation experiments on aluminum alloy plate with multiple defects show that the proposed broadband imaging method can achieve great performance and robustness without prior selection of optimal imaging frequency, and can maintain the imaging quality by long-time excitation under low voltage and low scattering.