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A comparison of hydrophone near-field scans and optical techniques for characterising high frequency sonar transducers (A)

A comparison of hydrophone near-field scans and optical techniques for characterising high frequency sonar transducers (A)
A comparison of hydrophone near-field scans and optical techniques for characterising high frequency sonar transducers (A)
Two potential methods of fully characterising the response of high frequency sonar transducers and arrays operating in the frequency range 100 kHz to 500 kHz are compared. In the first approach two-dimensional planar scans, with a spatial resolution of better than half a wavelength, are performed in the acoustic near-field using a small probe hydrophone. The measured two-dimensional data are propagated numerically using a Fourier Transform method to predict the far-field response. Alternatively the data can be back-propagated to re-construct the pressure distribution at the source, a powerful diagnostic technique which can identify defects in transducers and array elements. The second approach uses a scanning laser vibrometer to measure the velocity of the transducer surface; with the resulting velocity data also being used to predict the far-field response by numerical propagation. The two approaches are compared for a number of devices. Comparison of the propagated hydrophone near-field scan data with direct measurements at these ranges shows very good agreement, indicating the usefulness of the method for deriving far-field transducer responses from near-field measurements in laboratory tanks. The potential limitations introduced to the optical approach by the acousto-optic effect are discussed.
0001-4966
3436-3437
Humphrey, Victor F.
23c9bd0c-7870-428f-b0dd-5ff158d22590
Robinson, Stephen P.
ff096bc4-4e1f-44ec-ae1d-d671208d1ae7
Theobald, Peter D.
d792ecb6-c2b9-4ab6-97dd-9894aee05ac5
Hayman, Gary
e6dee9c3-cf2d-4c89-bb39-4a91612c6011
Cooling, Martin P.
18804dfd-3fd5-42af-abb9-b90cfc069b4b
Humphrey, Victor F.
23c9bd0c-7870-428f-b0dd-5ff158d22590
Robinson, Stephen P.
ff096bc4-4e1f-44ec-ae1d-d671208d1ae7
Theobald, Peter D.
d792ecb6-c2b9-4ab6-97dd-9894aee05ac5
Hayman, Gary
e6dee9c3-cf2d-4c89-bb39-4a91612c6011
Cooling, Martin P.
18804dfd-3fd5-42af-abb9-b90cfc069b4b

Humphrey, Victor F., Robinson, Stephen P., Theobald, Peter D., Hayman, Gary and Cooling, Martin P. (2008) A comparison of hydrophone near-field scans and optical techniques for characterising high frequency sonar transducers (A). Journal of the Acoustical Society of America, 123 (5), 3436-3437. (doi:10.1121/1.2934226).

Record type: Article

Abstract

Two potential methods of fully characterising the response of high frequency sonar transducers and arrays operating in the frequency range 100 kHz to 500 kHz are compared. In the first approach two-dimensional planar scans, with a spatial resolution of better than half a wavelength, are performed in the acoustic near-field using a small probe hydrophone. The measured two-dimensional data are propagated numerically using a Fourier Transform method to predict the far-field response. Alternatively the data can be back-propagated to re-construct the pressure distribution at the source, a powerful diagnostic technique which can identify defects in transducers and array elements. The second approach uses a scanning laser vibrometer to measure the velocity of the transducer surface; with the resulting velocity data also being used to predict the far-field response by numerical propagation. The two approaches are compared for a number of devices. Comparison of the propagated hydrophone near-field scan data with direct measurements at these ranges shows very good agreement, indicating the usefulness of the method for deriving far-field transducer responses from near-field measurements in laboratory tanks. The potential limitations introduced to the optical approach by the acousto-optic effect are discussed.

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More information

Published date: May 2008
Additional Information: Program abstract for 9th European Conference on Underwater Acoustics, ECUA2008, Paris, France, 29 June - 4 July 2008, CD-ROM.

Identifiers

Local EPrints ID: 65313
URI: https://eprints.soton.ac.uk/id/eprint/65313
ISSN: 0001-4966
PURE UUID: 6c1bbb2c-97bd-4b0f-9e36-81af3bcd898a
ORCID for Victor F. Humphrey: ORCID iD orcid.org/0000-0002-3580-5373

Catalogue record

Date deposited: 02 Mar 2009
Last modified: 20 Jul 2019 01:00

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Contributors

Author: Stephen P. Robinson
Author: Peter D. Theobald
Author: Gary Hayman
Author: Martin P. Cooling

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