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Proceedings Paper

A passive optical fibre hydrophone array utilising fibre Bragg grating sensors
Author(s): Andrew R. Karas; Anthony W. Papageorgiou; Peter R. Cook; John W. Arkwright
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Paper Abstract

Many current high performance hydrophones use piezo-electric technology to measure sound pressure in water. These hydrophones are sensitive enough to detect any sound above the lowest ambient ocean acoustic noise, however cost of manufacture, weight and storage volume of the array as well as deployment and maintenance costs can limit their largescale application. Piezo-electric systems also have issues with electro-magnetic interference and the signature of the electrical cabling required in a large array. A fibre optic hydrophone array has advantages over the piezo-electric technology in these areas.

This paper presents the operating principle of a passive optical fibre hydrophone array utilising Fibre Bragg Gratings (FBGs). The multiple FBG sensors are interrogated using a single solid state spectrometer which further reduces the cost of the deployed system. A noise equivalent power (NEP) comparison of the developed FBG hydrophone versus an existing piezo-electric hydrophone is presented as well as a comparison to the lowest ambient ocean acoustic noise (sea state zero). This research provides an important first step towards a cost effective multi sensor hydrophone array using FBGs.

Paper Details

Date Published: 22 February 2018
PDF: 9 pages
Proc. SPIE 10539, Photonic Instrumentation Engineering V, 105390H (22 February 2018); doi: 10.1117/12.2291102
Show Author Affiliations
Andrew R. Karas, Flinders Univ. (Australia)
Anthony W. Papageorgiou, Flinders Univ. (Australia)
Peter R. Cook, Flinders Univ. (Australia)
John W. Arkwright, Flinders Univ. (Australia)

Published in SPIE Proceedings Vol. 10539:
Photonic Instrumentation Engineering V
Yakov G. Soskind, Editor(s)

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