A theoretical model of a new electrostatic transducer incorporating fluidic amplification

Alan J. Walker, Anthony J. Mulholland, Ewan Campbell, Gordon Hayward

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Citations (Scopus)


This article concerns the design of a new electrostatic transducer whose backplate consists of a series of drilled pipes. A new one-dimensional model is derived which considers the interaction of the membrane with the air load, the air cavities, and the drilled pipes in the backplate. Dynamic equations for the impedance in each component of the device are calculated analytically and connected using interface conditions of continuity of pressure and radiation conditions into the air load. The model is able to produce solutions to the mechanical impedance of the device and the displacement of the membrane as a function of the device's design parameters. Model results for the output pressure compare well with previous experimental data. The inverse problem of retrieving the design parameters for a desired output is discussed.
Original languageEnglish
Title of host publication2008 IEEE International Ultrasonics Symposium
Place of PublicationPiscataway, NJ
Number of pages4
ISBN (Print)978142424283
Publication statusPublished - 21 Mar 2009
Externally publishedYes
Event 2008 IEEE Ultrasonics Symposium - Beijing, China
Duration: 2 Nov 20085 Nov 2008


Conference 2008 IEEE Ultrasonics Symposium


  • Electrostatics
  • Biomembranes
  • Ultrasonic transducers
  • Impedance
  • Acoustic transducers
  • Voltage
  • Erbium
  • Mathematical model
  • Mathematics
  • Design engineering


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