Review of Progress in Acoustic Levitation
Abstract
Acoustic levitation uses acoustic radiation forces to counteract gravity and suspend objects in mid-air. Although acoustic levitation was first demonstrated almost a century ago, for a long time, it was limited to objects much smaller than the acoustic wavelength levitating at fixed positions in space. Recent advances in acoustic levitation now allow not only suspending but also rotating and translating objects in three dimensions. Acoustic levitation is also no longer restricted to small objects and can now be employed to levitate objects larger than the acoustic wavelength. This article reviews the progress of acoustic levitation, focusing on the working mechanism of different types of acoustic levitation devices developed to date. We start with a brief review of the theory. Then, we review the acoustic levitation methods to suspend objects at fixed positions, followed by the techniques that allow the manipulation of objects. Finally, we present a brief summary and offer some future perspectives for acoustic levitation.
- Publication:
-
Brazilian Journal of Physics
- Pub Date:
- April 2018
- DOI:
- 10.1007/s13538-017-0552-6
- Bibcode:
- 2018BrJPh..48..190A
- Keywords:
-
- Acoustics;
- Acoustic levitation;
- Acoustic radiation force