Acoustic imaging by three-dimensional acoustic Luneburg meta-lens with lattice columns

Jung-Woo Kim, Seong-Jin Lee, Jun-Yeong Jo, Semyun Wang, Sang-Hoon Kim
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引用次数: 7

Abstract

A three-dimensional acoustic Luneburg lens, or acoustic Luneburg ball, has the advantage of refracting sound waves for all incident angles and concentrating higher sound pressure compared to a two-dimensional lens. A lens with a radius of 60 mm was designed with thousands of unit atoms comprising lattice columns to maintain its shape. The focusing performance of the lens was simulated using COMSOL Multiphysics, a finite element analysis program. Acoustic imaging was performed at a frequency of 10 kHz using a microphone, transducer, three-axis linear stage, and LabVIEW-based measurement program for a plastic lens made by a selective laser sintering 3D printer. The omnidirectional property was confirmed by measuring the sound pressure level while rotating the lens. The sound pressure level gain was defined to represent the frequency-dependent performance of the lens, and the maximum values were measured at approximately 20 dB and 15 dB in the numerical simulation and the experiment, respectively, at a frequency of 16 kHz. The results suggest that acoustic meta-lenses can be used for acoustic communication, imaging systems, and energy harvesting.
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带点阵柱的三维吕尼堡元透镜声学成像
与二维透镜相比,三维声学Luneburg透镜或声学Luneburg球具有对所有入射角的声波进行折射和集中更高声压的优点。设计了一个半径为60毫米的透镜,由数千个单位原子组成晶格柱,以保持其形状。利用有限元分析软件COMSOL Multiphysics对该透镜的聚焦性能进行了仿真。利用麦克风、换能器、三轴线性工作台和基于labview的测量程序,在10 kHz的频率下对选择性激光烧结3D打印机制造的塑料透镜进行声学成像。通过测量旋转透镜时的声压级,证实了其全向特性。定义声压级增益来表示透镜的频率依赖性能,在数值模拟和实验中,在16 kHz频率下,声压级增益的最大值分别约为20 dB和15 dB。结果表明,声学元透镜可用于声学通信、成像系统和能量收集。
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