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

doi:10.1088/1674-1056/26/9/094301

中国物理B ›› 2017, Vol. 26 ›› Issue (9): 94301-094301.doi: 10.1088/1674-1056/26/9/094301

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇下一篇

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

收稿日期:2017-04-07 修回日期:2017-05-18 出版日期:2017-09-05 发布日期:2017-09-05
通讯作者: Wen-Xiang Hu E-mail:wxhu@tongji.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 11374230).

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

Received:2017-04-07 Revised:2017-05-18 Online:2017-09-05 Published:2017-09-05
Contact: Wen-Xiang Hu E-mail:wxhu@tongji.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 11374230).

摘要/Abstract

摘要：

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.

关键词: Lamb wave, dispersion compensation, mode separation, two-component measurement

Abstract:

Key words: Lamb wave, dispersion compensation, mode separation, two-component measurement

中图分类号: (Ultrasonics, quantum acoustics, and physical effects of sound)

43.35.+d

徐琰锋, 胡文祥. Wideband dispersion removal and mode separation of Lamb waves based on two-component laser interferometer measurement[J]. 中国物理B, 2017, 26(9): 94301-094301.

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[J]. Chin. Phys. B, 2017, 26(9): 94301-094301.

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

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

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