Directional acoustic response of a silicon disc-based microelectromechanical systems structure

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Abstract

A microelectromechanical systems (MEMS)-based structure capable of operating mechanically as a directional acoustical sensor is presented. The structure, fabricated through the commercially available SOIMUMPS foundry process, consists of two circular discs attached to a central suspension beam, fixed at both ends. The design of the structure resembles other directional MEMS microphones that mimic the directional hearing organ of the parasitoid fly, Ormia ochracea. Modal analysis and mechanical acoustic directionality analysis using both laser Doppler vibrometry and finite element modelling have been implemented. It is demonstrated that this coupled MEMS structure exhibits an acoustic directional response, with a one-to-one relationship between the relative vibration amplitudes of the two coupled discs and the angle of sound, from −75° to +60°.
Original languageEnglish
Pages (from-to)276-279
Number of pages4
JournalMicro and Nano Letters
Volume9
Issue number4
Early online date11 Apr 2014
DOIs
Publication statusPublished - Apr 2014

Keywords

  • microelectromechanical system
  • directional acoustical sensor
  • acoustic directional response

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