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Measurement and imaging of high-frequency sonar fields using acousto-optic tomography.

Theobald, P D; Robinson, S P; Koukoulas, T; Hayman, Gary (2009) Measurement and imaging of high-frequency sonar fields using acousto-optic tomography. J. Acoust. Soc. Am., 125 (4). p. 2555.

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Abstract

The acoustic near-field of a high-frequency sonar array transducer has been measured using a laser scanning acousto-optic method and reconstructed using a tomographic technique similar to that used for X-ray Computed Tomography. This measurement, using a laser interferometer to scan a plane in front of the transducer for a series of transducer rotations, provides an image of the acoustic field for a plane in front of the transducer array. This method allows measurement of the acoustic field without perturbing the field being measured, which can occur when using the planar hydrophone scanning method, provides high spatial resolution with minimal phase averaging across the measurement aperture and provides potential for significantly decreasing the scan time. Measurements have been performed on two 1-3 composite transducer arrays at frequencies between 330 kHz and 500 kHz. These are compared with planar hydrophone scans obtained using a 1.5 mm probe hydrophone. Both parallel and fan beam tomographic scan geometries have been considered along with the effect of lateral scan resolution versus angular rotation resolution.

Item Type: Article
Keywords: sonar, tomography, near-field, acousto-optic
Subjects: Acoustics
Acoustics > Underwater Acoustics
Last Modified: 02 Feb 2018 13:15
URI: http://eprintspublications.npl.co.uk/id/eprint/4369

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