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Air-Coupled Ultrasound and Leaky Lamb Waves in Composites

  • A. Safaeinili
  • O. I. Lobkis
  • D. E. Chimenti

Abstract

Recently, improvements in instrumentation have provided the option of gas- or air-coupled ultrasonic testing as a realistic alternative to immersion or contact testing. In this paper we present theoretical and experimental results on resonant sound transmission methods mediated by ultrasonic coupling directly through ambient air. Although these methods are not new [1], they have only recently been considered for MHz applications. Advances in transducer technology [2–5] have further improved signal to noise ratios.

Keywords

Incident Angle Transmission Coefficient Transmission Function Numerical Distance Angular Response 
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.
    M. Luukkala, P. Heikilla, and Y. Surakka, Plate wave resonance — a contactless test method, Ultrasonics 9, 201–208 (1971).CrossRefGoogle Scholar
  2. 2.
    B.T. Khuri-Yakub, J.H. Kim, C.-H. Chou, P. Parent, and G.S. Kino, A new design for air transducers, in IEEE Ultrasonics Symposium Proc (Ed B. R. McAvoy) (IEEE, New York, 1988), 503–06.CrossRefGoogle Scholar
  3. 3.
    K. Suzuki, K. Huguchi, and H. Tanigawa, A silicon electrostatic ultrasonic transducer, IEEE Trans. Ultrason. Ferro. Freq. Contr. 36, 620–27 (1989).CrossRefGoogle Scholar
  4. 4.
    D.W. Schindel, D.A. Hutchins, Lichun Zou, and M. Sayer, The design and characterization of micromachined air-coupled capacitance transducers, IEEE Trans. Ultrason. Ferroelect. Freq. Cont., 42, 42–50 (1995).CrossRefGoogle Scholar
  5. 5.
    W.M.D. Wright, D.A. Hutchins, and D.W. Schindel, these proceedingsGoogle Scholar
  6. 6.
    M. Castaings, R. Farlow, G. Hayward and P. Cawley, these proceedingsGoogle Scholar
  7. 7.
    O.I. Lobkis, A. Safaeinili and D.E. Chimenti, Precision ultrasonic reflection studies in fluid-coupled plates, J. Acoust. Soc. Am., to be published.Google Scholar
  8. 8.
    D.E. Chimenti, A. Safaeinili, and O.I. Lobkis, these proceedings.Google Scholar

Copyright information

© Plenum Press, New York 1996

Authors and Affiliations

  • A. Safaeinili
    • 1
  • O. I. Lobkis
    • 1
  • D. E. Chimenti
    • 2
  1. 1.Center for NDEIowa State UniversityAmesUSA
  2. 2.Aero Engrg & Engrg Mechanics DeptIowa State UniversityAmesUSA

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