利用波导型声透镜探索声波在空气中的聚焦  

Research on Acoustic Focusing in the Air Using Wave-guide Acoustic Lens

作　　者：周桑霓 胡嘉莹 宋富民 张国伟 于智杰 曾育锋[1] YU Zhi-jie;ZENG Yu-feng(South China Normal University,Guangdong Guangzhou 510006)

机构地区：[1]华南师范大学,广东广州510006

出　　处：《大学物理实验》2018年第3期20-24,共5页Physical Experiment of College

摘　　要：声透镜是实现声聚焦的一种重要工具,它通过改变声传播路径上介质的分布和引入适当的相移,从而使波阵面指向性发生变化,作用于声场,实现聚焦。波导型声透镜在空气中能实现低频声波的聚焦,且聚焦效果较好。但由于测量环境的不同,声波遇到墙壁等刚性边界时会被反弹,实际的聚焦区域与理论值会有些许偏差。Acoustic lens is an important tool to achieve acoustic focusing.It changes the directivity of the wave front by changing the medium distribution on the acoustic propagation path and introducing the appropriate phase shift,which acts on the acoustic field to achieve focusing.Wave-guide acoustic lens in the air can achieve low-frequency sound wave focus,and the focusing effect is good.However,due to the different measurement environment,acoustic waves will be bounced back when encountering rigid boundaries such as walls,and the actual focal area will deviate slightly from the theoretical value.

关 键 词：波导型声透镜 低频声波聚焦 空气中声聚焦 

分 类 号：O4-34[理学—物理]