文献类型：期刊文献

英文题名：Ultrasonic guided wave phased array based on reconstructed pulse-echo signals from phase information

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

机构：[1] Shanghai Key Laboratory of Intelligent Sensing and Detection Technology, School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, 200237, China

年份：2024

卷号：2822

期号：1

外文期刊名：Journal of Physics: Conference Series

收录：EI(收录号：20244617347759)

语种：英文

外文关键词：Dispersions - Echo suppression - Guided electromagnetic wave propagation - Image reconstruction - Ultrasonic imaging - Ultrasonic testing - Ultrasonic waves

摘要：Aiming at the inherent dispersion characteristics of ultrasonic guided waves and the problems of gratings and side lobes in classical total focusing method (TFM) imaging algorithms, this paper proposes a full focus imaging algorithm based on reconstruct signals from phase information. Utilizing the numerical solution of the dispersion curve in the wavenumber domain, the time domain signal of Lamb wave is propagated backward to revise the changes in waveform shape caused by dispersion, and the flight time of the pulse-echo is eliminated simultaneously. The phase of pulse-echo after dispersion compensation should be consistent with the excitation signal. And the pulse-echo should have a large waveform correlation coefficient with the excitation signal. For each imaging point, dispersion compensation for all collected signals is respectively implemented so that the sign coherence factor (SCF) and the waveform correlation factor (WCF) between pulse-echo and excitation waveform can be extracted to reconstruct scattering signals. The reconstructed signals only contain information about the pulse-echo from defect. TFM imaging of the reconstructed signal can effectively suppress the grating side lobes of classical TFM imaging and improve the signal-to-noise ratio (SNR). ? 2024 Institute of Physics Publishing. All rights reserved.