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Updated: May 24, 2026

Microparticle Manipulation by Standing Surface Acoustic Waves with Dual-frequency Excitations
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MEMS Biomimetic Acoustic Pressure Gradient Sensitive Structure for Sound Source Localization.

Peng An1, Weizheng Yuan, Sen Ren

  • 1Micro and Nano Electro Mechanical System Laboratory, Northwestern Polytechnical University, Xi'an City, Shaanxi Province, 710072, China; E-Mails: anpeng@mail.nwpu.edu.cn (P.A.); rensen@mail.nwpu.edu.cn (S.R.).

Sensors (Basel, Switzerland)
|February 21, 2012
PubMed
Summary

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Researchers mimicked the Ormia ochracea fly's hearing organ to create a novel MEMS acoustic sensor. This biomimetic device effectively distinguishes sound direction using phase and amplitude differences.

Area of Science:

  • Bioacoustics
  • Micro-Electro-Mechanical Systems (MEMS)
  • Biomimetics

Background:

  • The parasitoid fly Ormia ochracea possesses a highly sensitive auditory system for sound localization.
  • Existing acoustic sensors often lack the directional sensitivity found in biological systems.

Purpose of the Study:

  • To design and fabricate a Micro-Electro-Mechanical Systems (MEMS) acoustic pressure gradient sensitive structure.
  • To mimic the mechanically coupled tympana of the Ormia ochracea fly for enhanced sound localization.
  • To analyze the acoustic-structural coupling effects for directional sound detection.

Main Methods:

  • Derivation of analytic formulas for resultant force and moment on the structure from incoming plane waves.
  • Modal analysis to determine vibration modes (in-phase and out-of-phase) and eigenfrequencies.
Keywords:
MEMSbiomimeticparasitoid flypressure gradientsound source localization

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  • Acoustic-structural coupled analysis to evaluate the performance of the biomimetic structure.

    • Main Results:

    • The designed MEMS structure exhibits distinct in-phase and out-of-phase vibration modes.
    • Mechanical coupling effectively enlarges phase and amplitude differences between the two diaphragms.
    • These differences increase with incident angle, enabling sound direction discrimination.

    Conclusions:

    • The biomimetic MEMS acoustic sensor successfully replicates the sound localization principle of the Ormia ochracea fly.
    • The device demonstrates potential for applications requiring precise directional sound detection.
    • Fabrication process and device results confirm the feasibility of the proposed design.