Minimum trap separation for acoustical levitation using phased ultrasonic transducer arrays
Paper i proceeding, 2019

Acoustic levitation for interactive visualizations is an emerging field which uses ultrasonic transducer arrays to induce radiation forces on small beads. To fully utilize the interactive and responsive aspect of the system, each bead must be controllable freely in the interaction space without interfering with the other beads. When beads are placed far enough apart it is possible to design a sound field that traps all the beads at their desired positions, taking any potential limitations of the hardware into account. The underlying physics limit how close in space two traps can be without interfering with each other. In this paper, we investigate the minimum spacing required between two beads for them to successfully and independently levitate in acoustical traps. Multiple methods for the sound field design are considered and compared with regards to the overall separation required as well as the gracefulness in the breakdown region.

Phased array


acoustic levitation


Carl Andersson

Chalmers, Arkitektur och samhällsbyggnadsteknik, Teknisk akustik

Jens Ahrens

Chalmers, Arkitektur och samhällsbyggnadsteknik, Teknisk akustik

Proceedings of the International Congress on Acoustics

22267808 (ISSN) 24151599 (eISSN)

Vol. 2019-September 1117-1123

International Congress on Acoustics (ICA)
Aachen, Germany,

Levitation with localised tactile and audio feedback for mid-air interactions (Levitate)

Europeiska kommissionen (EU) (EC/H2020/737087), 2017-01-01 -- 2020-12-31.


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