Focusing higher-order Lamb waves based on the Luneburg lens
In order to improve the spatial resolution and the signal-to-noise ratio of Lamb waves in structural health monitoring systems or non-destructive testing techniques, this study presents the construction of Luneburg lenses for focusing higher-order Lamb waves based on the thickness variation. The dis...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2023-04-01
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| Series: | Frontiers in Physics |
| Subjects: | |
| Online Access: | https://www.frontiersin.org/articles/10.3389/fphy.2023.1128265/full |
| _version_ | 1797843235346841600 |
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| author | Tianming Ye Tianming Ye Shengzeng Zhou Shengzeng Zhou Xuanmin Du Xuanmin Du Jiaqi Liu Jiaqi Liu |
| author_facet | Tianming Ye Tianming Ye Shengzeng Zhou Shengzeng Zhou Xuanmin Du Xuanmin Du Jiaqi Liu Jiaqi Liu |
| author_sort | Tianming Ye |
| collection | DOAJ |
| description | In order to improve the spatial resolution and the signal-to-noise ratio of Lamb waves in structural health monitoring systems or non-destructive testing techniques, this study presents the construction of Luneburg lenses for focusing higher-order Lamb waves based on the thickness variation. The dispersion curves of Lamb waves are calculated firstly, from which the relation between the phase velocity of a specific mode and the plate thickness is quantified. After that, the plate thickness is determined via the refractive index variation. To demonstrate the generality of this design scheme, two lenses, i.e., the A1-wave-based Luneburg lens and the S2-wave-based Luneburg lens are constructed, and their focusing abilities are examined via numerical simulations in both the time domain and frequency domain. It is revealed that the A1 wave and S2 wave can be focused with a focusing size smaller than one wavelength. The design methodology is easy to realize and can be used to control higher-order Lamb waves efficiently, which also provides potential application values in wave detections and energy collections. |
| first_indexed | 2024-04-09T17:01:41Z |
| format | Article |
| id | doaj.art-46d69f09fa3e453abf7e7f8756ceb1b2 |
| institution | Directory Open Access Journal |
| issn | 2296-424X |
| language | English |
| last_indexed | 2024-04-09T17:01:41Z |
| publishDate | 2023-04-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Physics |
| spelling | doaj.art-46d69f09fa3e453abf7e7f8756ceb1b22023-04-21T04:35:35ZengFrontiers Media S.A.Frontiers in Physics2296-424X2023-04-011110.3389/fphy.2023.11282651128265Focusing higher-order Lamb waves based on the Luneburg lensTianming Ye0Tianming Ye1Shengzeng Zhou2Shengzeng Zhou3Xuanmin Du4Xuanmin Du5Jiaqi Liu6Jiaqi Liu7Shanghai Marine Electronic Equipment Research Institute, Shanghai, ChinaNational Key Laboratory of Science and Technology on Underwater Acoustic Antagonizing, Shanghai, ChinaShanghai Marine Electronic Equipment Research Institute, Shanghai, ChinaNational Key Laboratory of Science and Technology on Underwater Acoustic Antagonizing, Shanghai, ChinaShanghai Marine Electronic Equipment Research Institute, Shanghai, ChinaNational Key Laboratory of Science and Technology on Underwater Acoustic Antagonizing, Shanghai, ChinaShanghai Marine Electronic Equipment Research Institute, Shanghai, ChinaNational Key Laboratory of Science and Technology on Underwater Acoustic Antagonizing, Shanghai, ChinaIn order to improve the spatial resolution and the signal-to-noise ratio of Lamb waves in structural health monitoring systems or non-destructive testing techniques, this study presents the construction of Luneburg lenses for focusing higher-order Lamb waves based on the thickness variation. The dispersion curves of Lamb waves are calculated firstly, from which the relation between the phase velocity of a specific mode and the plate thickness is quantified. After that, the plate thickness is determined via the refractive index variation. To demonstrate the generality of this design scheme, two lenses, i.e., the A1-wave-based Luneburg lens and the S2-wave-based Luneburg lens are constructed, and their focusing abilities are examined via numerical simulations in both the time domain and frequency domain. It is revealed that the A1 wave and S2 wave can be focused with a focusing size smaller than one wavelength. The design methodology is easy to realize and can be used to control higher-order Lamb waves efficiently, which also provides potential application values in wave detections and energy collections.https://www.frontiersin.org/articles/10.3389/fphy.2023.1128265/fullhigher-order Lamb wavesLuneburg lensrefractive indexwave focusing phenomenonultrasound |
| spellingShingle | Tianming Ye Tianming Ye Shengzeng Zhou Shengzeng Zhou Xuanmin Du Xuanmin Du Jiaqi Liu Jiaqi Liu Focusing higher-order Lamb waves based on the Luneburg lens Frontiers in Physics higher-order Lamb waves Luneburg lens refractive index wave focusing phenomenon ultrasound |
| title | Focusing higher-order Lamb waves based on the Luneburg lens |
| title_full | Focusing higher-order Lamb waves based on the Luneburg lens |
| title_fullStr | Focusing higher-order Lamb waves based on the Luneburg lens |
| title_full_unstemmed | Focusing higher-order Lamb waves based on the Luneburg lens |
| title_short | Focusing higher-order Lamb waves based on the Luneburg lens |
| title_sort | focusing higher order lamb waves based on the luneburg lens |
| topic | higher-order Lamb waves Luneburg lens refractive index wave focusing phenomenon ultrasound |
| url | https://www.frontiersin.org/articles/10.3389/fphy.2023.1128265/full |
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