Sparse Reconstruction Based Time-frequency Representation for Time-of-flight Extraction of Undersampled Lamb Wave Signal

被引：0
|
作者：
Wang, Zhe [1 ]
Huang, Songling [1 ]
Wang, Shen [1 ]
Wang, Qing [2 ]
Zhao, Wei [1 ]
机构：
[1] Tsinghua Univ, Dept Elect Engn, Beijing 100084, Peoples R China
[2] Univ Durham, Dept Engn, Durham DH1 3LE, England
来源：
2020 CONFERENCE ON PRECISION ELECTROMAGNETIC MEASUREMENTS (CPEM) | 2020年
基金：
中国国家自然科学基金;
关键词：
Lamb wave; sparse reconstruction; time-frequency; representation; time-of-flight; undersampled signal;
D O I：
10.1109/cpem49742.2020.9191705
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Lamb wave has received considerable attention for inspecting defects. However, the undersampling might occur and lead to the incomplete signal samples. This paper proposes the sparse reconstruction based method to extract the time-of-flight (TOF) in undersampled Lamb wave signal. The sparsity of time-frequency representation (TFR) is utilized to build the sparse reconstruction model and the orthogonal matching pursuit is applied to solve this model. The TOF is calculated according to the time-frequency information in the TFR. The method is implemented on simulated Lamb wave signal and the relative error of TOF is 1.48 %. The results demonstrate that the accurate TOF is obtained in undersampled situation.
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页数：2
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