【作者】 夏建平； 施懿宸； 孙宏祥；

【Author】 XIA Jian-ping;SHI Yi-chen;SUN Hong-xiang;Faculty of Science, Research Center of Fluid Machinery Engineering and Technology, Jiangsu University;

【机构】 江苏大学理学院流体机械工程技术研究中心；

【摘要】 我们分别在理论与实验上实现了浸没在水中金属圆柱结构的多焦点声聚焦效应。当入射平面声波从外侧激发金属圆柱时,可在金属圆柱内部聚焦成一个或多个焦点。该效应来源于金属圆柱的Mie共振模式,与负折射机制实现声聚焦效应不同,是一种全新的物理机制。基于严格声散射法理论计算得到的声压全场分布与纹影法实验测量的结果符合很好。更多还原

【Abstract】 We report both experimentally and theoretically that a multifocal acoustic focusing lens is realized by a metal cylinder structure immersed in water. The acoustic waves can be focused on one or more points at the centre of the cylinder. This phenomenon arises from the Mie-resonance modes in the cylinder at many frequencies, which is essentially distinct from the previous studies originating from the negative refraction. The acoustic pressure fields measured in the Schlieren imaging system agree with the results calculated using the acoustic scattering theory.更多还原