文献类型：期刊文献

英文题名：An optimized total focusing method based on delay-multiply-and-sum for nondestructive testing

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

机构：[1]East China Univ Sci & Technol, Key Lab Pressure Syst & Safety, Sch Mech & Power Engn, Shanghai 200237, Peoples R China

年份：2023

卷号：128

外文期刊名：ULTRASONICS

收录：;EI(收录号：20224413026159);WOS:【SCI-EXPANDED(收录号:WOS:000879217000002)】；

基金：Acknowledgements This work was supported in part by the National Key Research and Development Plan of China (No. 2022YFF0605604) and the National Natural Science Foundation of China (Nos. 12025403, U1930202, 51835003 and 12104155) .

语种：英文

外文关键词：Phased array; Synthetic focusing; Delay-multiply-and-sum; Total focusing method

摘要：Total focusing method (TFM) attracts much interest because of high image resolution and large inspection coverage. However, the synthetic focusing approach based on delay-and-sum beamforming employs only the defect information contained in the dataset while ignoring the spatial information of the array signals, leading to limited imaging performance mixed with artifacts and noise. In addition, the signal-to-noise ratio (SNR) suffers due to single-element emission of full matrix capture. This work combines a modified delay-multiply-and-sum (DMAS) beamforming approach with conventional synthetic focusing in the TFM algorithm, to achieve opti-mization of TFM imaging performance. DMAS-based TFM is able to take full advantage of the defect and spatial information in the array dataset, and to generate new frequency components for better image reconstruction. As demonstrated on a series of comparative simulation and experimental results, the imaging results of the opti-mized TFM provide a considerable improvement in SNR. Better lateral spatial resolution is also achieved due to the increased number of equivalent transducer elements and second harmonic component. Therefore, this work provides a quite promising alternative solution for the post-processing of ultrasonic phased array with improved imaging performance.