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Parametric sound fields by phase-cancellation excitation of primary waves.
Blekinge Institute of Technology, School of Engineering, Department of Mechanical Engineering.
2008 (English)Conference paper, Published paper (Refereed) Published
Abstract [en]

By radiating bifrequency primary waves from two ultrasonic emitters with changing the phases of the primary waves, we can obtain the sound fields that are different from the usual in‐phase excitation. Especially, for the excitation of out‐phase by 180 degrees the difference frequency wave has the directivity of almost uniformity near the acoustic axis. Additionally, the sound pressure levels of the harmonic components of the difference frequency and the primary waves as well are suppressed by 10 dB and more

Place, publisher, year, edition, pages
Stockholm: American Institute of Physics , 2008.
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:bth-6831DOI: http://dx.doi.org/10.1063/1.2956216Local ID: oai:bth.se:forskinfo6775239E19BE8055C1257C3D00397820OAI: oai:DiVA.org:bth-6831DiVA: diva2:834378
Conference
I18th International Symposium on Nonlinear Acoustics
Available from: 2013-12-10 Created: 2013-12-10 Last updated: 2015-06-30Bibliographically approved

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Hedberg, Claes

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