Note: Attenuation motion of acoustically levitated spherical rotor

P. Lü, Z. Y. Hong, J. F. Yin, N. Yan, W. Zhai, H. P. Wang

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Here we observe the attenuation motion of spherical rotors levitated by near-field acoustic radiation force and analyze 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 exponential attenuation motion depends mainly on the levitation height, the mass of rotor, and the depth of concave ultrasound 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.

Original languageEnglish
Article number116103
JournalReview of Scientific Instruments
Volume87
Issue number11
DOIs
StatePublished - 1 Nov 2016

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