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A small cavity for detecting sound-induced flow.

Junpeng Lai1, Zihan Liu1, Morteza Karimi1

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This study introduces a novel acoustic flow sensor compatible with silicon microfabrication. The design utilizes cavity dimensions to direct acoustic particle velocity, simplifying sensor fabrication.

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Area of Science:

  • Acoustics
  • Microfabrication
  • Sensor Technology

Background:

  • Silicon microphones are mass-produced using microfabrication.
  • The primary component is the cavity behind the diaphragm.
  • Understanding acoustic particle velocity in cavities is crucial.

Purpose of the Study:

  • To develop an acoustic flow sensor compatible with silicon microfabrication.
  • To minimize design departures from existing silicon microphones.
  • To study acoustic particle velocity within a planar surface cavity.

Main Methods:

  • Investigated acoustic particle velocity in a planar surface cavity.
  • Developed a simple analytical model for cavity dimensions.
  • Utilized finite element modeling for detailed analysis.
  • Conducted experimental measurements of acoustic particle velocity.

Main Results:

  • Demonstrated inward and outward acoustic particle velocity flow within a single cavity.
  • Cavity dimensions were estimated using an analytical model.
  • Experimental measurements closely matched analytical and finite element models.
  • Validated the acoustic flow sensing mechanism.

Conclusions:

  • The proposed cavity design effectively directs acoustic particle velocity.
  • This approach simplifies the design and fabrication of acoustic flow sensors.
  • The method is compatible with existing silicon microfabrication processes.