PMN-PT single-crystal transducer for non-destructive evaluation

G. Edwards, H. L.W. Chan, A. Batten, Kwok Ho Lam, H. S. Luo, D. A. Scott

Research output: Journal article publicationJournal articleAcademic researchpeer-review

22 Citations (Scopus)

Abstract

A lead magnesium niobate-lead titanate (PMN-PT) single-crystal disc was used to construct an ultrasonic transducer for non-destructive evaluation (NDE). The surface displacements (at the thickness mode resonance) of the PMN-PT single crystal and a PZT disc of similar dimensions were measured using a laser scanning technique. It was observed that the PMN-PT disc has rather uniform ultrasonic displacements across its surface while the PZT exhibited an interference pattern indicative of coupling of the radial mode vibration with the thickness mode. This is consistent with the electrical impedance versus frequency measurements showing that for the PZT disc, a strong radial mode with many harmonics were clearly observed, and unwanted peaks existed near the thickness mode resonance. However, for the PMN-PT single-crystal disc, many resonance peaks were observed near the radial mode resonance but the harmonics of the radial mode cannot be identified. The PMN-PT disc has a clean thickness mode resonance peak and a high thickness electromechanical coupling coefficient. The discs were mounted in stainless steel housings with appropriate electrical connections to form transducers. Tungsten/epoxy backing and aluminum/epoxy front-face matching were incorporated to provide the necessary performance of very short ringdown times required for NDE applications. The characteristics of the PMN-PT transducer were compared with that of a PZT transducer of similar construction.
Original languageEnglish
Pages (from-to)434-440
Number of pages7
JournalSensors and Actuators, A: Physical
Volume132
Issue number2
DOIs
Publication statusPublished - 20 Nov 2006

Keywords

  • NDE
  • Non-destructive evaluation
  • PMN
  • PZT
  • Transducers

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering

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