Publication: Research - peer-review › Article in proceedings – Annual report year: 2012
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.
|Number of pages||12|
|Conference||41st International Congress and Exposition on Noise Control Engineering|
|City||New York City, NY|
|Period||19-08-12 → 22-08-12|
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