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The detection by sonar of difficult targets (including centimetre-scale plastic objects and optical fibres) buried in saturated sediment. (In special on: the detection of buried marine targets)

Leighton, T.G. and Evans, R.C.P. (2008) The detection by sonar of difficult targets (including centimetre-scale plastic objects and optical fibres) buried in saturated sediment. (In special on: the detection of buried marine targets) Applied Acoustics, 69, (5), pp. 438-463. (doi:10.1016/j.apacoust.2007.05.002).

Record type: Article

Abstract

This paper reports on a laboratory study into the use of sonar to detect objects, two of which exhibit a poor acoustic impedance mismatch with the water-saturated sediment in which they are buried to depth of about 30 cm. The targets are solid cylinders having diameters of 20–25 mm and 50 cm length, made of polyethylene, of telecommunications optical fibre, and of steel. Steel spheres are included for comparison. A poor acoustic impedance mismatch between the target and the host sediment is one factor that can make buried targets difficult to detect with sonar, but such detection is increasingly becoming an issue in a range of applications from archaeology to defence to telecommunications. Attention is paid to those signal processing techniques which could be of potential benefit. For this range of test objects, comparisons are made between use of optimal filtering and synthetic aperture sonar. In addition, the potential of a range of acousto-optical effects (optical time domain reflectometry, Raman and Brillouin scattering, and fibre optic hydrophones) is assessed in the Appendix for the particular application of detecting non-metallised fibre optic telecommunications cables. A web page dedicated to this paper hosts movies and reports at http://www.isvr.soton.ac.uk/fdag/uaua/target_in_sand.htm.

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More information

Published date: May 2008
Keywords: sonar, sediment, seabed, plastic target, optical fibre

Identifiers

Local EPrints ID: 51044
URI: http://eprints.soton.ac.uk/id/eprint/51044
ISSN: 0003-682X
PURE UUID: 5317aa77-adff-45a5-b668-716161e776d8
ORCID for T.G. Leighton: ORCID iD orcid.org/0000-0002-1649-8750

Catalogue record

Date deposited: 30 Apr 2008
Last modified: 17 Jul 2017 14:49

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