title: Underwater acoustic sensors based on fiber bragg gratings.
abstract: 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.
authors.affiliation: Department for Technologies, University of Naples "Parthenope", Centro Direzionale, Isola C4, 80143, Naples, Italy.
authors.forename: Stefania
authors.initials: S
authors.lastname: Campopiano
authors.forename: Antonello
authors.initials: A
authors.lastname: Cutolo
authors.forename: Andrea
authors.initials: A
authors.lastname: Cusano
authors.forename: Michele
authors.initials: M
authors.lastname: Giordano
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Parente
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Lanza
authors.forename: Armando
authors.initials: A
authors.lastname: Laudati