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Measurement of Surface and Lamb Waves with Application on Acoustic Sensing and Non-Destructive Evaluation

  • Yung-Chun Lee
  • Shi Hoa Kuo
  • Cheng-Hsien Chung
Conference paper
Part of the IUTAM Bookseries book series (IUTAMBOOK, volume 26)

Abstract

This paper summarizes the design and fabrication of several novel ultrasound transducers for measuring surface and Lamb waves. The experimental setup and measurement method for each developed transducer are also addressed.According to piezoelectric materials being used, two types of ultrasound transducers are discussed which are PVDF focusing transducers and micro-machined PZT transducers. For the PVDF transducers, a defocusing measurement along with a V(f,z) waveform processing technique are developed which allow accurately determination of dispersion curves of either surface waves of a layered medium or Lamb waves of a thin plate. Elastic properties of coating layers and thin plates are therefore non-destructive determined. For the micro-machined PZT transducers, a differential type wave velocity measurement is developed which is extremely sensitive to small wave velocity variation. Hence, the mechanical and dielectric loading effects of a fluid to the Lamb waves of a piezoelectric plate are experimentally and theoretically characterized, which can be used for acoustic sensing of fluids.

Keywords

Dispersion Curve Lamb Wave Piezoelectric Plate Ultrasound Transducer Acoustic Sensing 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    Xiang, D., Hsu, N. N., Blessing, G. V.: Design, construction and application of a large aperture lens-less line-focus PVDF transducer.Ultrasonics 34 641-647 (1996).CrossRefGoogle Scholar
  2. 2.
    Robert, M., Molingou, G., Snook, K., Cannata, J., Shung, K. K.: Fabrication of focused poly(vinylidene fluoride-trifluoroethylene) P(VDF-TrFE) copolymer 40-50 MHz ultrasound transducers on curved surfaces. J. Appl. Phys. 96 252-256 (2004).CrossRefGoogle Scholar
  3. 3.
    Lee, Y.-C., Cheng, S.-W.: Measuring lamb wave dispersion curves of a bi-layered plate and its application on material characterization of coating. IEEE Trans. Ultrason. Ferroelec. Freq. Contr. 48 830-837 (2001).CrossRefGoogle Scholar
  4. 4.
    Nayfeh, A. H.:Wave Propagation in Layered Anisotropic Media.Elsevier, New York (1995).Google Scholar
  5. 5.
    Josse, F., Shana, Z. A.: On the use of ZX-LiNbO3 acoustic plate mode devices as detectors for dilute electrolytes. Sensors & Actuators B9 97-112 (1992).CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • Yung-Chun Lee
    • 1
  • Shi Hoa Kuo
    • 1
  • Cheng-Hsien Chung
    • 1
  1. 1.Department of Mechanical EngineeringNational Cheng Kung UniversityTainanTaiwan

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