Creation of Large Quiet Zones in the Presence of Acoustical Levitation Traps
Paper i proceeding, 2021

We propose a method to generate an acoustical levitation trap at the same time as suppressing the sound in a multi-wavelength region of space. The method uses a spherical basis expansion of the sound field in the quiet zone, calculated by translating individual source expansions of elements in a transducer array. We show that it is possible to control the size of the quiet zone with the truncation order of the expansion, and explain the trade-off between field suppression in the quiet zone and stiffness loss of the levitation trap. Measurements of a generated sound field show the existence of a region of lower sound pressure. Simulations demonstrate a contrast up to 50 dB and sizes up to 60 mm for a 256 element array.

Transducer Arrays

Sound Field Control

Acoustic Levitation


Carl Andersson

Chalmers, Arkitektur och samhällsbyggnadsteknik, Teknisk akustik

Jens Ahrens

Chalmers, Arkitektur och samhällsbyggnadsteknik, Teknisk akustik

IEEE International Ultrasonics Symposium, IUS

19485719 (ISSN) 19485727 (eISSN)

978-0-7381-1209-1 (ISBN)

2021 IEEE International Ultrasonics Symposium (IUS)
Xi’an, China,






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