| Issue |
Acta Acust.
Volume 6, 2022
|
|
|---|---|---|
| Article Number | 12 | |
| Number of page(s) | 10 | |
| Section | Acoustic Materials and Metamaterials | |
| DOI | https://doi.org/10.1051/aacus/2021058 | |
| Published online | 08 April 2022 | |
Scientific Article
2D phononic-crystal Luneburg lens for all-angle underwater sound localization
1
Ocean College, Zhejiang University, Zhoushan, Zhejiang 316021, PR China
2
Research Center for Intelligent Sensing, Zhejiang Lab, Hangzhou, Zhejiang 311121, PR China
* Corresponding author: Liangxu@zju.edu.cn
Received:
6
September
2021
Accepted:
16
December
2021
Phononic crystals are well known for acoustic wave manipulation which may have potential application in an underwater acoustic detection system. In this work, we design and simulate a two-dimensional Luneburg lens based on gradient-index (GRIN) phononic crystal that is composed of PLA-Air inclusion, and a novel application of GRIN phononic crystals is proposed to sound localization. The Luneburg lens has a broadband working range, from 1500 Hz to 7500 Hz, for acoustic wave focusing with sensitive directivity and signal-to-noise improvement. By searching maximum wave intensity’s position of the focusing beam, the propagating direction of an unknown sound wave can be directly recognized covering 360°. Besides, we redesign the conventional square-lattice Luneburg lenses using annular lattices for better performance. The annular-lattice Luneburg lens overcomes the weakness of configuration defect due to the square lattice. The numerical results show that the redesign Luneburg lenses have high accuracy for distance measurement from 5 m to 35 m through the triangulation location. In a word, this work tries to explore a novel application of phononic crystals in underwater acoustic positioning and navigation technology.
Key words: Underwater metamaterials / Phononic crystal / Luneburg lens / Acoustic detection / Sound localization
© The Author(s), Published by EDP Sciences, 2022
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.