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Directivity Dependence of a Distributed Fiber Optic Hydrophone on Array Structure.

Wenmin Li1, Yu Chen1, Yan Liang1

  • 1College of Meteorology and Oceanography, National University of Defense Technology, Changsha 410073, China.

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|August 26, 2022
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Summary

Increasing the sensing channel length of a distributed fiber optic hydrophone (DFOH) improves directivity by reducing side lobes and narrowing the main lobe. This structural optimization enhances acoustic signal processing capabilities.

Keywords:
channel lengthchannel spacingdirectivity functiondistributed fiber optic hydrophone

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Area of Science:

  • Acoustics
  • Optical Engineering
  • Signal Processing

Background:

  • Distributed Fiber Optic Hydrophones (DFOH) offer adjustable structures for enhanced underwater acoustic detection.
  • Understanding the relationship between DFOH array structure and directivity is crucial for optimizing performance.

Purpose of the Study:

  • To theoretically and experimentally investigate how the array structure of a DFOH influences its directivity.
  • To provide guidance for the structural design of DFOHs in signal processing applications.

Main Methods:

  • Derivation of directivity functions for sensing channels and the overall DFOH.
  • Performing simulations based on derived directivity functions.
  • Conducting experimental validation on Qingyang lake to verify theoretical findings.

Main Results:

  • Longer sensing channel length leads to a lower first-order side lobe and a narrower main lobe.
  • Increasing channel length from 1 to 3 resulted in a 4.9° decrease in main lobe width and a 6 dB reduction in first-order side lobe height.
  • Channel spacing has minimal impact on directivity when shorter than the wavelength, with variations below 0.5° and 0.94 dB.

Conclusions:

  • The study confirms that sensing channel length is a key parameter for optimizing DFOH directivity.
  • Channel spacing is less critical for directivity under specific conditions (spacing < wavelength).
  • Findings offer practical guidance for designing improved DFOH systems for underwater acoustics.