Novel concept of array transducer element using combined resonance between oscillations of hemispherical piezoceramic shell and bulk water

Kenji Otsu, Shin Yoshizawa, Shin Ichiro Umemura

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

For therapeutic ultrasound array transducers, it is required to reduce the electrical impedance of their elements so that the transducer can produce high ultrasonic power at a relatively low drive voltage. For this purpose, we are investigating a new concept of piezoceramic element using its breathing mode. Numerical simulation showed that a concave hemispherical piezoceramic shell with a diameter on the order of a wavelength in water is effective for obtaining good acoustic matching with water. High acoustical coupling was achieved by utilizing the combined resonance between the breathing-mode oscillation of the piezoceramic shell and the volume oscillation of a water sphere half enclosed by the shell.

Original languageEnglish
Title of host publication2011 IEEE International Ultrasonics Symposium, IUS 2011
Pages2181-2184
Number of pages4
DOIs
Publication statusPublished - 2011
Event2011 IEEE International Ultrasonics Symposium, IUS 2011 - Orlando, FL, United States
Duration: 2011 Oct 182011 Oct 21

Publication series

NameIEEE International Ultrasonics Symposium, IUS
ISSN (Print)1948-5719
ISSN (Electronic)1948-5727

Conference

Conference2011 IEEE International Ultrasonics Symposium, IUS 2011
Country/TerritoryUnited States
CityOrlando, FL
Period11/10/1811/10/21

Keywords

  • array transducer
  • breathing mode
  • bulk water sphere
  • hemispherical shell
  • piezocermic

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