环状活塞换能器的声镊子研究

发布时间：2018-11-11 19:01

【摘要】：随着生物医学和工业领域对纳米粒子的非接触式操控需求的日益强烈,对新型声镊子的设计提出更高的要求.在忽略球粒子所在液体的粘滞力和声损耗的前提下,利用球散射法计算了环状换能器对轴向球粒子的声辐射力,在理论上发现环状换能器捕获轴向上球粒子的可能性.球散射法既可以应用于远大于波长的粒子,也可以用于远小于波长的粒子,具有普遍适用性.根据理论结果发现声辐射力受球粒子与换能器之间的距离,环状换能器内外半径大小,球粒子的大小以及材料特性等因素的影响.而且环状换能器的近场区存在着一些声辐射拉力区.声辐射拉力区随着环状换能器外半径,内半径的改变而发生相应变化.环状活塞换能器对轴向球状粒子的声辐射力特性可以用来设计新式声镊子装置,其中空位置可以用来放置监控设备来监控操纵粒子,或者安装机械操控装置以改变换能器的位置和方向.这些理论和计算结果对单声源声镊子的实现具有指导意义.
[Abstract]:With the increasing demand for non-contact manipulation of nanoparticles in biomedical and industrial fields, higher requirements are put forward for the design of novel tweezers. On the premise of ignoring the viscous force and sound loss of the liquid in which the spherical particle is located, the sound radiation force of the annular transducer on the axial spherical particle is calculated by using the spherical scattering method. The possibility of the annular transducer capturing the axial upward spherical particle is found theoretically. The spherical scattering method can be used not only for particles far larger than wavelength, but also for particles far smaller than wavelength. According to the theoretical results, it is found that the acoustic radiation force is affected by the distance between the ball particle and the transducer, the inner and outer radius of the ring transducer, the size of the ball particle and the properties of the material. In addition, there are some sound radiation force regions in the near field of the annular transducer. With the change of the outer radius and the inner radius of the ring transducer, the sound radiation tension region changes accordingly. The sound radiation force characteristics of ring piston transducers to axial spherical particles can be used to design new tweezers, where empty positions can be used to monitor and manipulate particles. Or install mechanical controls to change the position and direction of the transducer. These theoretical and computational results are instructive for the realization of mono-source tweezers.
【作者单位】：近代声学教育部重点实验室南京大学声学研究所;
【基金】：国家自然科学基金(11274166) 声场声信息国家重点实验室开放课题研究基金(SKLOA201609)
【分类号】：TB552

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