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.
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Andrew R. Karas, Anthony W. Papageorgiou, Peter R. Cook, 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);