Note: Attenuation motion of acoustically levitated spherical rotor

Here we observe theattenuation motion of spherical rotors levitated by near-field acousticradiation force andanalyze the factors that affect the duration time of free rotation. It is found that the rotating speed of freely rotating rotor decreases exponentially with respect to time. The time constant of exponentialattenuation motion depends mainly on the levitation height, the mass of rotor, and the depth of concaveultrasound emitter. Large levitation height, large mass of rotor, and small depth of concave emitter are beneficial to increase the time constant and hence extend the duration time of free rotation.

Source: Review of Scientific Instruments - November 23, 2016 Category: Physics Authors: P. L ü, Z. Y. Hong, J. F. Yin, N. Yan, W. Zhai and H. P. Wang Source Type: research