基于相控聚焦原理的悬浮微粒操控研究  

Research on the control of suspended particles based on phase-controlled focusing principle

作　　者：马熳倩 孔令昊 古豪天 曾天佑 曾育锋[1,2] MA Man-qian;KONG Ling-hao;GU Hao-tian;ZENG Tian-you;ZENG Yu-feng(College of Physics and Telecommunications Engineering,South China Normal University,Guangzhou 510006,China;National Demonstration Center for Experimental Physics Education, South China Normal University, Guangzhou 510006, China)

机构地区：[1]华南师范大学物理与电信工程学院,广东广州510006 [2]华南师范大学物理国家级实验教学示范中心,广东广州510006

出　　处：《物理实验》2021年第6期25-29,36,共6页Physics Experimentation

摘　　要：设计了凹球面双发射极超声阵列结构,并结合相控聚焦原理,通过FPGA硬件系统实时控制换能器输入信号的相位参量,形成悬浮能力较强的驻波聚焦声场.根据预设的悬浮微粒移动轨迹,有规律地调节阵元信号的相位差,实现超声波束的动态聚焦,在声场移动的同时,带动波节附近悬浮微粒的移动.分别在竖直面与水平面操控微粒移动,研究微粒移动的准确度和可操控范围.实验结果表明:凹球面双发射极超声阵列的悬浮稳定性强,且可操控范围广.A concave spherical dual emitter ultrasonic array structure was designed,and the phase-controlled focusing principle was combined.The phase parameters of the input signal of the transducer were controlled in-time by the FPGA hardware system,and the standing-wave focused sound field with strong suspension ability was formed.According to the preset trajectory of the suspended particles,the phase difference of the array signal was adjusted regularly to realize the dynamic focusing of the ultrasonic beam.The suspended particles near the node moved as the sound field moved.The accuracy of controlling the movement of particles was studied,and two directions were selected for trajectory error analysis.Finally,the controllable range of particles was studied respctively on the vertical plane and the horizontal plane,which illustrated the strong suspension stability and the wide control range of the device.

关 键 词：超声驻波声场 相控聚焦原理 FPGA 全三维移动 

分 类 号：O426[理学—声学]