基于声学超材料的近场线声源聚焦成像方法研究

为了解决超声在检测微小组织的过程中衰减太快及实际操作过程中无法达到精准定位的问题,设计将亚波长声学探头置于声源近场中,结合声透镜式聚焦换能器,使声源实现对单个微小组织和多个微小组织的精准定位。通过运用 COMSOL 软件对声学超透镜进行建模,得到声压初始值为 100 Pa 时,声波进入模型内部后有明显的聚焦现象,模型内部的声压峰值不断增加,最高达到了 1 000 Pa ,从而降低了能量损耗,为今后研究相关近场声学精确控制微小物体奠定基础。

Focusing Imaging Method of Nearfield Sound Source Based onAcoustic Metamaterials

In order to solve the problem that ultrasound attenuates too fast in the process of detecting tiny tissues and can not achieve accurate positioning in the actual operation,the subwavelength acoustic probe is designed to be placed in the near field of the sound source and it is combined with the acoustic lens focusing transducer so that the sound source can achieve accurate positioning of single tiny tissues and multiple tiny tissues.By using COMSOL software to model the acoustic hyperlens,it is found that when the initial value of sound pressure is 100 Pa,the sound wave will obviously focus after entering the model,and the peak value of sound pressure inside the model will increase continuously and reach the highest value of 1000 Pa.Thus,the energy loss is reduced,which lays a foundation for the future research on the accurate control of small objects by the near field acoustics.