Sound Field Construction And Particle Manipulation Technology Based On Single-sided Phased Array

The realization of particle manipulation based on ultrasonic technology is a frontier topic of ultrasonic technology,which is widely used in many fields such as materials science,cytology,medicine,and so on.The control of ultrasonic radiation force by the ultrasonic phased array is a research hotspot at present.It can construct a complex sound field,realize the operation of particle capture,movement,and rotation,and the particle can be controlled in a wider range.In this paper,the ultrasonic phased array technology is used,and the symmetrical anti-phase superposition effect and genetic algorithm are used to carry out the theoretical calculation and sound field simulation analysis.A variety of tweezers-shaped sound fields with different shapes are constructed in the sound field space,and particle manipulation under the unilateral planar phased array is realized,and the experimental system is built for experimental verification.The main contents of this paper are as follows:(1)Using the symmetrical antiphase superposition effect,the tweezers with different shapes are constructed in the sound field space.Firstly,the phase of the phased array forming the focus point is calculated by the time inversion method,and then the phased array area is divided according to the shape of the tweezers shaped sound field,and the phase difference of the symmetrical transducer is calculated ?,The phase of phased-array element for ultrasonic levitation is obtained by superposition.Through the finite element simulation,the expected tweezers like the sound field are formed in the preset position,and the potential well is generated in the middle,which can hold the object.By adjusting the angle and position of the tweezers,the particles can be manipulated.The principle of phase calculation is simple and the particle can be manipulated in a wide range.(2)Based on the principle of acoustic radiation force,the fitness function is established according to the preset sound field,and the phase optimization is carried out based on a genetic algorithm until the result converges.Through the finite element simulation,the preset sound field is formed in the preset position,and the object can be clamped in the middle to realize the manipulation of the object.On this basis,the multi-point suspension of particles can be further realized.(3)According to the theory and the simulation results,the 8-phase inverter is designed by using the symmetrical antiphase superposition effect × The experiment is carried out on a 2-D phased array of 8.The experimental system is set up with appropriate equipment,and the particles are captured at the preset position of the acoustic tweezers.By changing the preset position,the object can move back and forth in a certain range.The experimental results show that the symmetrical anti-phase superposition effect can be used to manipulate the particles well.In this paper,the particle manipulation of the ultrasonic phased array is studied by theoretical calculation,sound field simulation,and experimental verification.Compared with the traditional way,the particle manipulation techniques used in this paper have a wider range of object manipulation and simpler calculation.