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Sensors 2009, 9(6), 4446-4454; doi:10.3390/s90604446

Underwater Acoustic Sensors Based on Fiber Bragg Gratings

1,* , 2
1 Department for Technologies, University of Naples “Parthenope”, Centro Direzionale, Isola C4, 80143, Naples, Italy 2 Department of Engineering, University of Sannio, Corso Garibaldi, 82100, Benevento, Italy 3 Istituto per i Materiali Compositi e Biomedici, CNR, 80125, Naples, Italy 4 OptoSmart s.r.l., 80121, Naples, Italy
* Author to whom correspondence should be addressed.
Received: 19 May 2009 / Revised: 3 June 2009 / Accepted: 3 June 2009 / Published: 5 June 2009
(This article belongs to the Special Issue State-of-the-Art Sensors Technology in Italy)
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We report on recent results obtained with a fiber optic hydrophone based on the intensity modulation of the laser light in a FBG (Fiber Bragg Grating) under the influence of the sound pressure. In order to control the behavior of the hydrophone in terms of sensitivity and bandwidth, FBGs have been coated with proper materials, characterized by different elastic modulus and shapes. In particular, new experiments have been carried out using a cylindrical geometry with two different coating, showing that the sensitivity is not influenced by the shape but by the transversal dimension and the material characteristics of the coating.
Keywords: fiber optics sensors; fiber Bragg gratings; hydrophones fiber optics sensors; fiber Bragg gratings; hydrophones
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Campopiano, S.; Cutolo, A.; Cusano, A.; Giordano, M.; Parente, G.; Lanza, G.; Laudati, A. Underwater Acoustic Sensors Based on Fiber Bragg Gratings. Sensors 2009, 9, 4446-4454.

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