Near field acoustic holography with microphones on a rigid sphere

Finn Jacobsen, Guillermo Moreno-Pescador, Efren Fernandez Grande, Jørgen Hald

Research output: Contribution to journalJournal articleResearchpeer-review


Spherical near field acoustic holography (spherical NAH) is a technique that makes it possible to reconstruct the sound field inside and just outside a spherical surface on which the sound pressure is measured with an array of microphones. This is potentially very useful for source identification. The sphere can be acoustically transparent or it can be rigid. A rigid sphere is somewhat more practical than an open sphere. However, spherical NAH based on a rigid sphere is only valid if it can be assumed that the sphere has a negligible influence on the incident sound field, and this is not necessarily a good assumption when the sphere is very close to a radiating surface. This Letter examines the matter through simulations and experiments.
Original languageEnglish
JournalAcoustical Society of America. Journal
Issue number6
Pages (from-to)3461-3464
Publication statusPublished - 2011


  • Acoustic intensity
  • Acoustic holography
  • Microphones
  • Acoustic signal processing


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