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Proceedings Article

Fiber laser hydrophone array

[+] Author Affiliations
David J. Hill, Phillip J. Nash

Defence Evaluation and Research Agency Winfrith (United Kingdom)

David A. Jackson, David J. Webb, S. F. O'Neill

Univ. of Kent at Canterbury (United Kingdom)

Ian Bennion, Lin Zhang

Aston Univ. (United Kingdom)

Proc. SPIE 3860, Fiber Optic Sensor Technology and Applications, 55 (December 9, 1999); doi:10.1117/12.372963
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From Conference Volume 3860

  • Fiber Optic Sensor Technology and Applications
  • Michael A. Marcus; Brian Culshaw
  • Boston, MA | September 19, 1999

abstract

In recent years growing interest has surrounded the development of fiber laser sensors (FLS). This is due to their ultra high sensitivity to temperature and strain as well as their ability to be multiplexed along a single fiber using WDM techniques. It is their extreme sensitivity that has led to them being considered as acoustic pressure sensors rather than standard fiber Bragg gratings. The work presented here describes the development of an array of FLS configured as hydrophones. We discuss the design of the single mode fiber laser used throughout our system; comparing examples based upon distributed Bragg reflectors (DBR) and distributed feedback (DFB). In addition we discuss both the theoretical and experimental acoustic sensitivity enhancements obtained by the application of an elasto-plastic coating to the FLS. The array configuration is described, as is the heterodyne interrogation scheme using an unbalanced Mach-Zehnder interferometer with WDM channel selection. Results from the measurement of the minimal detectable acoustic signal of a bare fiber laser are shown to be -69 dB re.Pa/(root)Hz at 1 kHz when using a 200 m path imbalanced readout interferometer. Further gains in the sensitivity due to the application of various coatings are reported, as is a full characterization of an array of fiber laser hydrophones. Finally we discuss the future research of the FLS, and the areas in which the technology is particularly applicable.

© (1999) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

David J. Hill ; Phillip J. Nash ; David A. Jackson ; David J. Webb ; S. F. O'Neill, et al.
"Fiber laser hydrophone array", Proc. SPIE 3860, Fiber Optic Sensor Technology and Applications, 55 (December 9, 1999); doi:10.1117/12.372963; http://dx.doi.org/10.1117/12.372963


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