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Chin. Phys. B, 2017, Vol. 26(9): 094301    DOI: 10.1088/1674-1056/26/9/094301
ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS Prev   Next  

Wideband dispersion removal and mode separation of Lamb waves based on two-component laser interferometer measurement

Yan-Feng Xu(徐琰锋), Wen-Xiang Hu(胡文祥)
Institute of Acoustics, Tongji University, Shanghai 200092, China
Abstract  

Ultrasonic Lamb waves are considered as a sensitive and effective tool for nondestructive testing and evaluation of plate-like or pipe-like structures. The nature of multimode and dispersion causes the wave packets to spread, and the modes overlap in both time and frequency domains as they propagate through the structures. By using a two-component laser interferometer technique, in combination with a priori knowledge of the dispersion characteristics and wave structure information of Lamb wave modes, a two-component signal processing technique is presented for implementing dispersion removal and mode separation simultaneously for two modes mixture signals of Lamb waves. The proposed algorithm is first processed and verified using synthetic Lamb wave signals. Then, the two-component displacements test experiment is conducted using different aluminum plate samples. Moreover, we confirm the effectiveness and robustness of this method.

Keywords:  Lamb wave      dispersion compensation      mode separation      two-component measurement  
Received:  07 April 2017      Revised:  18 May 2017      Published:  05 September 2017
PACS:  43.35.+d (Ultrasonics, quantum acoustics, and physical effects of sound)  
  43.40.+d  
Fund: 

Project supported by the National Natural Science Foundation of China (Grant No. 11374230).

Corresponding Authors:  Wen-Xiang Hu     E-mail:  wxhu@tongji.edu.cn

Cite this article: 

Yan-Feng Xu(徐琰锋), Wen-Xiang Hu(胡文祥) Wideband dispersion removal and mode separation of Lamb waves based on two-component laser interferometer measurement 2017 Chin. Phys. B 26 094301

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