Open AccessDirectional acoustic response of a silicon disc‐based microelectromechanical systems structure
Author(s) -
Mackie David James,
Jackson Joseph Curt,
Brown James Gordon,
Uttamchandani Deepak,
Windmill James Frederick Charles
Publication year - 2014
Publication title -
micro and nano letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.25
H-Index - 31
ISSN - 1750-0443
DOI - 10.1049/mnl.2013.0677
Subject(s) - microelectromechanical systems , acoustics , materials science , modal analysis , vibration , finite element method , optoelectronics , structural engineering , engineering , physics
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°.