Acoustic levitation of a polystyrene sphere, the first spherical object to be acoustically levitated that is larger than the acoustic wavelength. Credit: Andrade et al. ©2016 AIP Publishing
In a new study, researchers have demonstrated the acoustic levitation of a 50-mm (2″) solid polystyrene sphere using ultrasound—acoustic waves that are above the frequency of human hearing. It is one of the first times that an object larger than the wavelength of the acoustic wave has been acoustically levitated. Previously, this has been achieved only for a few specific cases, such as wire-like and planar objects. In the new study, the levitated sphere is 3.6 times larger than the 14-mm acoustic wavelength used here.
“Acoustic levitation of small particles at the acoustic pressure nodes of a standin...
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