Generation and detection of broadband airborne ultrasound with cellular polymer ferroelectrets

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • Mario Dansachmüller - , Johannes Kepler University Linz (Author)
  • Ivan Minev - , Johannes Kepler University Linz (Author)
  • Petr Bartu - , Johannes Kepler University Linz (Author)
  • Ingrid Graz - , Johannes Kepler University Linz, University of Cambridge (Author)
  • Nikita Arnold - , Johannes Kepler University Linz (Author)
  • Siegfried Bauer - , Johannes Kepler University Linz (Author)

Abstract

Cellular polypropylene ferroelectrets are useful for broadband airborne ultrasound generation and detection up to the fundamental thickness extension resonance. The authors show that the coupling of ferroelectrets to air alters the electromechanical resonance of the foam. In an acoustical cavity, Fabry-Perot resonances are obtained, which is in excellent agreement with the plane wave model calculations. For material assessment in airborne ultrasound applications, a figure of merit is used based on the electromechanical coupling factor and acoustical impedance of the material. The good coupling of ferroelectrets to gases results from the small acoustical impedance of the material.

Details

Original languageEnglish
Article number222906
JournalApplied physics letters
Volume91
Issue number22
Publication statusPublished - 2007
Peer-reviewedYes
Externally publishedYes

Keywords

ASJC Scopus subject areas