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Preliminary Modeling of an Intracochlear Piezoelectric Microphone

[+] Author Affiliations
Robert D. Manson, I. Y. Shen

University of Washington, Seattle, WA

Paper No. DETC2013-13645, pp. V001T09A024; 9 pages
  • ASME 2013 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
  • Volume 1: 15th International Conference on Advanced Vehicle Technologies; 10th International Conference on Design Education; 7th International Conference on Micro- and Nanosystems
  • Portland, Oregon, USA, August 4–7, 2013
  • Conference Sponsors: Design Engineering Division, Computers and Information in Engineering Division
  • ISBN: 978-0-7918-5584-3
  • Copyright © 2013 by ASME


A preliminary model of an intracochlear piezoelectric microphone is proposed that mimics the structure of stereocilia in the cochlea. Its purpose is to determine the crucial system parameters prior to fabrication of an actual testing set up via a mathematical model. As a first approximation, the system is modeled as a 1-D, periodic beam with N identical substructures. Each one consists of a nanorod grown on an Si substrate, a bottom electrode, piezoelectric thin film, and two top electrodes. The model consists of: a finite element analysis of a single substructure to obtain its flexibility matrix and differential voltage (DV) under unit loads; and a mapping of these results through the structure to predict displacement and DV of each substructure. A parametric study is then conducted based on this model. It was determined that the nanorod length was the most critical parameter in improving sensitivity. By increasing the amount of drag force on the nanorods the sensitivity grows. Substructures near fixed boundaries generate higher DV thus leading to better sensitivity too. The number of substructure in the microphone would also affect signal-to-noise ratio.

Copyright © 2013 by ASME
Topics: Modeling , Microphones



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