Ultrasonic standing wave levitation ability

To improve the levitation ability and its stability of the ultrasonic standing wave device, a device with concave spheres as radiating and reflecting surfaces was put forward. The generation process of the ultrasonic standing wave was simulated by software ANSYS and the distributions of the acoustic pressure and its maximums were found under different concave spheres of radiating and reflecting surfaces. The standing wave levitating positions were predicted by the Matlab simulation method. An ultrasonic standing wave levitation device was prototyped according to the optimized results, and several particles were levitated in the device. The measured levitation positions were in accordance with the simulated ones. 3 steel balls with diameter 3 mm were levitated in 3 wave nodes simultaneously when the distance between the radiating surface and the reflecting surface is double of the wavelength, showing that the levitating ability and stability enhanced significantly.