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Mapping the acoustical field produced by high frequency sonar transducers using optical tomographic techniques.

Robinson, S P; Theobald, P; Humphrey, V*; Haymana, G*; Cooling, M* (2007) Mapping the acoustical field produced by high frequency sonar transducers using optical tomographic techniques. In: 2nd International Conference and Exhibition on Underwater Acoustic Measurements: Technologies & Results., June 2007, Crete.

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Abstract

A technique is presented for characterising the acoustic field radiated by high frequency sonar arrays in water. The technique exploits the acousto-optic interaction between a laser beam and the sound field; a heterodyne interferometer (laser Doppler vibrometer) being used to detect the local refractive index changes produced in the water by a propagating acoustic wave travelling in a direction orthogonal to the laser beam. Measurements obtained in this way are processed using tomographic techniques to produce a two-dimensional image representing a ¿slice¿ of the acoustic field. The technique is tested on a sonar array operating in the frequency range 330 kHz to 500 kHz. The results are compared with those obtained by planar-scanning of the acoustic field with a probe hydrophone, with good agreement obtained. The optical method offers the potential for rapid, broad-band, high-resolution, non-perturbing measurements of acoustic fields, and can be a powerful diagnostic tool in assessing the performance of sonars.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Keywords: sonar, tomography, nearfield, acousto-optic
Subjects: Acoustics
Acoustics > Underwater Acoustics
Last Modified: 02 Feb 2018 13:15
URI: http://eprintspublications.npl.co.uk/id/eprint/3917

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