Zhao Liuxian, Tang Lihua, Liu Yuxin, Sun Zhaoyong, Liu Qimin, Bi Chuanxing
Institute of Sound and Vibration Research, Hefei University of Technology, 193 Tunxi Road, Hefei 230009, China.
Department of Mechanical and Mechatronics Engineering, The University of Auckland, Auckland 1010, New Zealand.
J Acoust Soc Am. 2023 Aug 1;154(2):594-601. doi: 10.1121/10.0020541.
This article reports an acoustic Luneburg lens (ALL) design with graded refractive index for passive directivity detection of acoustic sources. The refractive index profile of the lens is realized based on square pillars with graded variation of their dimensions. Numerical and experimental studies are conducted to investigate the performance of directivity detection. The results demonstrate that the lens designed and developed in this study is capable of precisely detecting the directivity of one acoustic source. Furthermore, the directivities of two acoustic sources can also be detected with a resolution of 15°. In addition, different methods are investigated, including introducing phase difference by tuning input signals or moving ALL, and increasing the aperture size of ALL, to improve the resolution of dual sources directivity detection.
本文报道了一种用于声源被动指向性检测的具有渐变折射率的声学朗伯透镜（ALL）设计。该透镜的折射率分布是基于尺寸渐变的方柱实现的。进行了数值和实验研究以考察指向性检测性能。结果表明，本研究设计并开发的透镜能够精确检测单个声源的指向性。此外，还能够以15°的分辨率检测两个声源的指向性。另外，研究了不同方法，包括通过调整输入信号或移动ALL引入相位差以及增大ALL的孔径尺寸，以提高双源指向性检测的分辨率。
