Broadband poly(vinylidene fluoride-trifluoroethylene) ultrasound focusing transducers for determining elastic constants of coating materials

Cheng Hsien Chung, Yung Chun Lee

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

This paper develops broadband Poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)] focusing transducers and its surface wave measurement system for determining the elastic constants of coating layers. The measurement is based on a defocussing measurement method and V(f,z) analysis of the focusing transducers. Few P(VDF-TrFE) focusing transducers are successfully fabricated in laboratory and the wave measurements can cover a wide frequency range of 4-120 MHz with great accuracy. Brass and glass substrates electroplated with nickel coating layer with thickness ranging from 15 to 60 μm are tested in this work. Dispersion curves sensitivity analysis is carried out to decide the best approach for inversely determination of coating elastic properties. A searching method based on the downhill simplex algorithm and numerical calculation on waves in a layered half-space model is used for inversely determining the elastic constants of coating layer. The results show good agreement with reported data. Measurement accuracy and potential applications for other types of nondestructive evaluation of the focusing transducers and measurement system are addressed.

Original languageEnglish
Pages (from-to)101-110
Number of pages10
JournalJournal of Nondestructive Evaluation
Volume28
Issue number3-4
DOIs
Publication statusPublished - 2009 Dec 1

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Broadband poly(vinylidene fluoride-trifluoroethylene) ultrasound focusing transducers for determining elastic constants of coating materials'. Together they form a unique fingerprint.

Cite this