The Mechanism and Simulation of Suspended Particle Manipulation in a Double Concave Focused Ultrasonic Field

In order to improve the suspension ability of focused ultrasonic field and broaden the moving area of suspended particles, the calculation formula of sound pressure in the ultrasonic field and the relation between the delay time of array elements and the focus position in concave spherical array were studied. COMSOL multiphysics was used for simulation verification. By building a levitation device for the concave spherical ultrasonic array, the phase of emitter signal was controlled to realize the movement of suspended particles in the vertical direction. The particle motion trajectory in the experiment was in good agreement with that in the simulation experiment. The results showed that the double concave spherical ultrasonic array had stronger sound pressure and better focusing ability and the motion of the suspended particles in the two-dimensional plane could be realized with phase signal control.