| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
|
|
|
|
A Baseline-Free Defect Imaging Technique in Plates Using Time Reversal of Lamb Waves |
| Hyunjo Jeong**, Sungjong Cho, Wei Wei
|
Division of Mechanical and Automotive Engineering, Wonkwang University, Iksan, Jeonbuk 570-749, Korea
|
|
| Cite this article: |
|
Hyunjo Jeong, Sungjong Cho, Wei Wei 2011 Chin. Phys. Lett. 28 064301 |
|
|
|
|
Abstract We present an analytical investigation for a baseline-free imaging of a defect in plate-like structures using the time-reversal of Lamb waves. We first consider the flexural wave (A0 mode) propagation in a plate containing a defect, and reception and time reversal process of the output signal at the receiver. The received output signal is then composed of two parts: a directly propagated wave and a scattered wave from the defect. The time reversal of these waves recovers the original input signal, and produces two additional sidebands that contain the time-of-flight information on the defect location. One of the side-band signals is then extracted as a pure defect signal. A defect localization image is then constructed from a beamforming technique based on the time-frequency analysis of the side band signal for each transducer pair in a network of sensors. The simulation results show that the proposed scheme enables the accurate, baseline-free imaging of a defect.
|
| Keywords:
43.35.Cg
43.60.Tj
43.60.Lq
|
|
|
Received: 06 January 2011
Published: 29 May 2011
|
|
| PACS: |
43.35.Cg
|
(Ultrasonic velocity, dispersion, scattering, diffraction, and Attenuation in solids; elastic constants)
|
| |
43.60.Tj
|
(Wave front reconstruction, acoustic time-reversal, and phase conjugation)
|
| |
43.60.Lq
|
(Acoustic imaging, displays, pattern recognition, feature extraction)
|
|
|
|
|
|
[1] Ng C T and Veidt M 2009 Smart Mater. Struct. 18 074006
[2] Zhang H Y, Chen X H, Cao Y P and Yu J B 2010 Chin. Phys. Lett. 27 104301
[3] Sohn H, Park H W, Law K H and Farrar C R 2007 J. Aerospace Eng. 20 141
[4] Fink M 1992 IEEE Trans. UFFC 39 555
[5] Wang C H, Rose J T and Chang F K 2004 Smart Mater Struct. 13 415
[6] Park H W, Sohn H, Law K H and Farrar C R 2007 J. Sound Vib. 302 50
[7] Xu B and Giurgiutiu V 2007 J. Nondestr. Eval. 26 123
[8] Park H W, Kim S B and Sohn H 2009 Wave Motion 46 451
[9] Norris A N and Vemula C 1995 J. Sound Vib. 181 115
[10] Jeong H and Jang Y-S 2000 IEEE Trans. UFFC 47 612
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
