Study on heavy matching layer transducer towards producing second harmonics

Zulfadhli Zaini, Masamizu Osuga, Hayato Jimbo, Jun Yasuda, Ryo Takagi, Shin Yoshizawa, Shin Ichiro Umemura

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Cavitation bubbles are microbubbles which can be incepted by highly negative pressure. Producing such highly negative pressure exceeding the cavitation threshold is difficult to accomplish due to nonlinear propagation followed by focal phase shift. By superimposing the second harmonic to fundamental is a way to significantly reduce the problem. However, the conventional design for an air-backed transducer is not suitable to generate both the second harmonic and fundamental at the same time. In order to overcome this problem, we propose a high impedance matching layer approach. Furthermore, we also construct a study to foresee the impact by adjusting the thickness ratio towards fundamental and second harmonic. Numerical simulation and experimental measurement have shown that by using a high impedance matching layer, efficiently generation of both the second harmonic (2MHz) and fundamental (1MHz) at the same time is possible. Besides, by adjusting the thickness ratio between piezocomposite and heavy matching layer will influence the amplitude of acoustic power over squared of voltage of the fundamental and second harmonic.

Original languageEnglish
Article number07KF15
JournalJapanese journal of applied physics
Volume55
Issue number7
DOIs
Publication statusPublished - 2016 Jul

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'Study on heavy matching layer transducer towards producing second harmonics'. Together they form a unique fingerprint.

Cite this