Lamb wave phased array imaging based on phase-amplitude compounding algorithm

被引：5

作者：

Li, Xuan ^{[1
]}

Liu, Lishuai ^{[1
]}

Xu, Haiming ^{[1
]}

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

来源：

MECHANICAL SYSTEMS AND SIGNAL PROCESSING | 2023年 / 205卷

基金：

上海市自然科学基金; 中国国家自然科学基金;

关键词：

Lamb wave phased array; Dispersion compensation; Total focusing method; Phase coherence factor; Multiple defects imaging; DAMAGE LOCALIZATION; DISPERSION; PLATE;

D O I：

10.1016/j.ymssp.2023.110882

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Aimed at improving the imaging performance of Lamb wave phased array based on Delay-andSum (DAS) of signal amplitude, a compounding imaging algorithm integrating amplitude and phase information of signal is proposed in this paper. By applying back propagation dispersion compensation, the pulse echoes caused by defects will be in-phase with the excitation signal, implementing signal focusing. In the proposed imaging algorithm, the amplitude imaging index is calculated by classical total focusing method (TFM) and the phase imaging index is calculated by phase coherence factor (PCF), which establishes the nonlinear mapping between imaging index and phase difference by sigmoid function with variable gradient. The final imaging results are the compound of two imaging indexes. The experimental validation is carried out on plates of different materials and dimensions with multiple types of defects based on uniform linear array. Compared with the imaging results of conventional TFM, the proposed imaging algorithm can effectively improve the signal-to-noise ratio (SNR) of the images and suppress artifacts, implementing threshold-free imaging.

引用

页数：16

共 43 条

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