Investigating the use of the acousto-optic effect for acoustic holography

Publication: Research - peer-reviewArticle in proceedings – Annual report year: 2012

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Recent studies have demonstrated that the acousto-optic effect, that is, the interaction between sound and light, can be used as a means to visualize acoustic fields in the audible frequency range. The changes of density caused by sound waves propagating in air induce phase shifts to a laser beam that travels through the acoustic field. This phenomenon can in practice be captured with a laser Doppler vibrometer (LDV), and the pressure distribution of the acoustic field can be reconstructed using tomography. The present work investigates the potential of the acousto-optic effect in acoustic holography. Two different holographic methods are examined for this purpose. One method first reconstructs the hologram plane using acousto-optic tomography and then propagates it using conventional near-field acoustic holography (NAH). The other method exploits the so-called Fourier Slice Theorem and bases all the calculations of the holographic algorithm on the Radon transform of the acoustic field. The validity of the proposed methods is examined in a simple study case by means of simulations and preliminary measurements.
Original languageEnglish
Title of host publicationInterNoise 2012
Number of pages12
Publication date2012
StatePublished

Conference

Conference41st International Congress and Exposition on Noise Control Engineering
Number41
CountryUnited States
CityNew York City, NY
Period19/08/1222/08/12
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