NDLI: Numerical and experimental analysis of coated Fiber Bragg Gratings for underwater acoustic detection

Content Provider	IEEE Xplore Digital Library
Author	Moccia, Massimo Consales, Marco Pisco, Marco Iadicicco, Agostino Giordano, Michele Galdi, Vincenzo Cutolo, Antonello Cusano, Andrea
Copyright Year	2011
Description	Author affiliation: Institute of Composite Biomedical Materials, National Research Council, Portici, 80055 Italy (Giordano, Michele) \|\| Optoelectronic Division, Engineering Department, University of Sannio, Benevento, 82100 Italy (Moccia, Massimo; Consales, Marco; Pisco, Marco; Cutolo, Antonello; Cusano, Andrea) \|\| CNR-SPIN and Waves Group, Department of Engineering, University of Sannio, Benevento, 82100 Italy (Galdi, Vincenzo) \|\| Department of Technology, University of Naples “Parthenope”, Naples, 80143, Italy (Iadicicco, Agostino)
Abstract	In this paper, we report on recent numerical and experimental results obtained with Fiber Bragg Grating (FBG) hydrophones for underwater sound pressure detection. Investigated optical hydrophones consist of FBGs coated with ring shaped overlay of different size. Numerical simulations, based on finite element method (FEM), have been performed to study the opto-acoustical response of the optical hydrophone and to set geometrical and mechanical properties of the coating material in order to get a desired frequency response. In particular, coating material has been selected to provide mechanical amplification through a low acoustic impedance and low damping in the desired frequency range. The hydrophone sensitivity versus the frequency presents characteristic resonances, which strongly improve the hydrophone opto-acoustic sensitivity with respect to the sensitivity background far from the resonances. Underwater acoustic measurements carried out in the range 4–35 kHz reveal a resonant behavior in accordance to numerical analysis. In addition, good linearity was observed versus local sound pressure demonstrating a minimum detectable sound pressure of few Pascal.
Starting Page	1
Ending Page	5
File Size	373928
Page Count	5
File Format	PDF
ISBN	9781467302470
e-ISBN	9781467302487
DOI	10.1109/SKIMA.2011.6090014
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-09-08
Publisher Place	Italy
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Bragg gratings Sensitivity Sonar applications Sonar equipment Acoustic sensors Fiber gratings Acoustics Sensors Optical Fibers Coatings
Content Type	Text
Resource Type	Article

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