Study on suspension ability of concave spherical ultrasound standing wave using phased arrays

Standing wave acoustic levitation utilizes the acoustic radiation forces generated by standing wave to hold samples against gravity. Among them, ultrasonic levitation using phased arrays has good application prospects. The principle of standing wave acoustic levitation is analyzed, and the experimental scheme of acoustic levitation using phased arrays is designed to evaluate the performance of ultrasonic levitator. The distribution of sound pressure between two arrays are approximately hourglass-shaped in space, and experimental results show that with the increase of the number of transducers, the suspension ability increases further,. The experiment of liquid droplet suspension further verifies the relationship between the voltage of excitation signal and the acoustic pressure. With the increase of the voltage of the excitation signal, the acoustic pressure amplitude increases gradually. The acoustic levitation using phased arrays is stable and insensitive to temperature, and can effectively improve the levitation ability.