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Proceedings Article

Fiber laser hydrophone for underwater acoustic surveillance and marine mammals monitoring

[+] Author Affiliations
N. Beverini, S. Firpi, E. Maccioni, M. Morganti, F. Stefani

Univ. di Pisa and CNISM (Italy)

P. Guerrini, A. Maguer

NATO Undersea Research Ctr. (Italy)

C. Trono

CNR, Istituto di Fisica Applicata Nello Carrara (Italy)

Proc. SPIE 7994, LAT 2010: International Conference on Lasers, Applications, and Technologies, 79941D (February 08, 2011); doi:10.1117/12.880973
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From Conference Volume 7994

  • LAT 2010: International Conference on Lasers, Applications, and Technologies
  • Vladislav Panchenko; Gérard Mourou; Aleksei M. Zheltikov
  • Kazan, Russian Federation | August 23, 2010

abstract

This work describes the progress in the developing of a hydrophonic sensors array, based on fiber laser technology, tailored for underwater acoustic surveillance of harbors, naval forces, and, in general, of maritime areas of strategic relevance; the same apparatus can also find application for marine mammals coastline surveying, simply addressing a suitable frequency detection band. The sensors are Distributed Bragg Reflectors Fiber Lasers. The laser active medium is an Er+ doped fiber included between two Bragg mirrors that are photo-imprinted through UV radiation on the fiber. The acoustic water pressure variations produce a longitudinal strain on the fiber laser structure with a consequent modulation of the emission wavelength. An in-fiber un-balanced Michelson interferometer transforms the wavelength modulation into phase modulation, enhancing the detection sensitivity. An acousto-optic modulator, mounted on one arm of the interferometer, generates a frequency carrier to allow conventional demodulation techniques. This apparatus has demonstrated a noise-equivalent level of less than 1 mPa/(Hz)1/2 in the 0.5-5 kHz frequency band. Experimentations in marine environment of sensor arrays are in progress, and the first results obtained on a couple of sensors written on a same fiber are presented.

© (2010) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

N. Beverini ; S. Firpi ; P. Guerrini ; E. Maccioni ; A. Maguer, et al.
"Fiber laser hydrophone for underwater acoustic surveillance and marine mammals monitoring", Proc. SPIE 7994, LAT 2010: International Conference on Lasers, Applications, and Technologies, 79941D (February 08, 2011); doi:10.1117/12.880973; http://dx.doi.org/10.1117/12.880973


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