A passive optical fibre hydrophone array utilising fibre Bragg grating sensors

Andrew R. Karas; Anthony W. Papageorgiou; Peter R. Cook; John W. Arkwright

doi:10.1117/12.2291102

22 February 2018 A passive optical fibre hydrophone array utilising fibre Bragg grating sensors

Andrew R. Karas, Anthony W. Papageorgiou, Peter R. Cook, John W. Arkwright

Proceedings Volume 10539, Photonic Instrumentation Engineering V; 105390H (2018) https://doi.org/10.1117/12.2291102
Event: SPIE OPTO, 2018, San Francisco, California, United States

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.

Citation Download Citation

Andrew R. Karas, Anthony W. Papageorgiou, Peter R. Cook, and John W. Arkwright "A passive optical fibre hydrophone array utilising fibre Bragg grating sensors", Proc. SPIE 10539, Photonic Instrumentation Engineering V, 105390H (22 February 2018); https://doi.org/10.1117/12.2291102

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