| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Focusing of Time Reversal Lamb Waves and Its Applications in Structural Health Monitoring |
| ZHANG Hai-Yan, CHEN Xian-Hua, CAO Ya-Ping, YU Jian-Bo
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| School of Communication and Information Engineering, Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Shanghai University, Shanghai 200072 |
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| Cite this article: |
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ZHANG Hai-Yan, CHEN Xian-Hua, CAO Ya-Ping et al 2010 Chin. Phys. Lett. 27 104301 |
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Abstract The focusing of time reversal acoustic fields for dispersive and multimodal Lamb waves is theoretically investigated and experimentally verified. It is demonstrated that the time reversal Lamb wave signal will reach the maximum amplitude when the observation point is located at the damage location. Based on the time reversal focusing theory, a damage imaging method is proposed for structural health monitoring using Lamb waves. The experiments employ a transducer network consisting of four piezoelectric transducers as actuators and as well sensors for excitation and measurement of Lamb waves. The results show that this method is able to accurately predict damage location and provides an estimation of the possible area even for damage close to one of the transducers or even slightly outside the transducer network.
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| Keywords:
43.20.+g
43.35.+d
47.35.Rs
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Received: 30 April 2010
Published: 26 September 2010
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| PACS: |
43.20.+g
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(General linear acoustics)
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43.35.+d
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(Ultrasonics, quantum acoustics, and physical effects of sound)
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47.35.Rs
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(Sound waves)
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