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Fiber-optic bionic microphone based compact sound source localization system with extended directional range.

Xin Liu1,2, Xinyu Hu1,2, Chen Cai1

  • 1State Key Laboratory of Transducer Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China.

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|August 7, 2024
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Summary
This summary is machine-generated.

This study presents a compact bionic sound source localization (SSL) system using fiber-optic microphones. The novel device accurately detects low-frequency sound direction across a wide angular range, overcoming limitations of traditional systems.

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Area of Science:

  • Acoustics
  • Bio-inspired Engineering
  • Micro-electro-mechanical Systems (MEMS)

Background:

  • Traditional sound source localization (SSL) systems are limited by bulky microphone arrays.
  • Miniature bionic SSL devices inspired by Ormia ochracea offer size advantages but struggle with low-frequency sound over wide angles.

Purpose of the Study:

  • To develop a compact, low-frequency SSL system with an extended directional range.
  • To overcome the angular limitations of existing miniature bionic SSL devices.

Main Methods:

  • Utilized two bionic micro-electro-mechanical system (MEMS) diaphragm-based fiber-optic microphones in a non-coplanar array (Φ44mm × 13mm).
  • Developed an algorithm for quantifying the azimuthal angle of sound sources.
  • Conducted simulations and experiments to validate system performance.

Main Results:

  • The system accurately determines the direction of acoustic signals below 1kHz within -90° to 90° azimuth.
  • A linear response was observed from -70° to 70°.
  • Achieved an angular measurement accuracy within ±7°.

Conclusions:

  • The developed compact SSL system effectively localizes low-frequency sound sources over an extended angular range.
  • This bio-inspired approach offers a significant advancement for miniature acoustic sensing applications.