Spherical near field acoustic holography with microphones on a rigid sphere: Abstract of paper

Finn Jacobsen (Invited author), Jørgen Hald (Invited author), Efren Fernandez Grande (Invited author), Guillermo Moreno (Invited author)

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Spherical near field acoustic holography (SNAH) is a recently developed technique that makes it possible to reconstruct the sound field inside and just outside an acoustically transparent spherical surface on which the sound pressure is measured with an array of microphones with negligible scattering. Because of the versatile geometry of a sphere SNAH is potentially extremely useful for source identification. On the other hand a rigid sphere is somewhat more practical than an open sphere, and it is possible to modify the SNAH theory so that a similar sound field reconstruction can be made with an array of microphones flush-mounted on a rigid sphere. However, this approach is only valid if it can be assumed that the sphere has a negligible influence on the incident sound field, in other words if multiple scattering can be ignored, and this is not necessarily a good assumption when the sphere is close to a radiating surface. This paper describes the modified SNAH theory and examines the matter through simulations and experimentally.
Original languageEnglish
JournalAcoustical Society of America. Journal
Issue number5
Pages (from-to)3385-3385
Publication statusPublished - 2008
EventAcoustics'08 - Paris, France
Duration: 29 Jun 20084 Jul 2008


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Copyright (2008) Acoustical Society of America. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America.


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