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Interface Characterization by True Guided Modes

  • Peter B. Nagy
  • Laszlo Adler
Chapter

Abstract

Guided acoustic waves along interfaces are especially sensitive to specific properties associated with boundary conditions and bond quality since their energy is effectively confined to the region of interest. On the other hand, this inherent advantage turns out to be a significant drawback for generation and detection of such guided waves. There are two basic types of propagating interface modes, which are shown schematically in Figure 1. First, there are leaky modes with higher phase velocity than at least one of the bulk velocities in the surrounding media. These modes “leak” their energy into one or more phase-matching bulk modes as they propagate along the interface and they can be readily excited by these mode-coupled bulk modes at the same incidence angle. In other words, the energy of leaky interface modes is not strictly confined to the boundary region therefore they are relatively easy to generate and detect. Because of their relatively short propagation length, leaky interface modes provide localized information on boundary properties and possible imperfections, which can be taken advantage of in ultrasonic NDE of bonded structures [1].

Keywords

Interface Wave Rayleigh Wave Interface Mode Compressive Pressure Ultrasonic Signal 
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.
    P.B. Nagy and L. Adler, J. Appl. Phys. 66, 4658 (1989).CrossRefGoogle Scholar
  2. 2.
    S. Rokhlin, M. Hefets, and M. Rosen, J. Appl. Phys. 51, 3579 (1980).CrossRefGoogle Scholar
  3. 3.
    S. Rokhlin, M. Hefets, and M. Rosen, J. Appl. Phys. 52, 2847 (1981).CrossRefGoogle Scholar
  4. 4.
    D.A. Lee and D.M. Corbly, IEEE Trans. Sonics Ultrason. SU-24, 206 (1977).CrossRefGoogle Scholar
  5. 5.
    A. Pilarski, Mater. Eval. 43, 765 (1985).Google Scholar
  6. 6.
    P.B. Nagy and L. Adler, J. Acoust. Soc. Am. 86, 594 (1989).CrossRefGoogle Scholar
  7. 7.
    P.B. Nagy and L. Adler, in Elastic Waves and Ultrasonic Nondestructive Evaluation, S.K. Data, J.D. Achenbach, and Y.S. Rajapakse, eds., (North-Holland, Amersterdam, 1990) pp. 229–239.Google Scholar
  8. 8.
    P.B. Nagy and L. Adler, in Physical Acoustics: Fundamental and Applied, to be published.Google Scholar
  9. 9.
    Y.C. Angel and J.D. Achenbach, in Review of Progress in Quantitative NDE, D.O. Thompson and D.E. Chimenti, eds., (Plenum, New York, 1985) Vol. 4A, pp. 83–89.CrossRefGoogle Scholar
  10. 10.
    J.D. Achenbach, O.K. Parikh, and Y.C. Lu, in Review of Progress in Quantitative NDE, D.O. Thompson and D.E. Chimenti, eds., (Plenum, New York, 1990) Vol. 9B, pp. 1693–1770.Google Scholar
  11. 11.
    N.F. Haines, The Theory of Sound Transmission and Reflection at Contacting Surfaces (Berkeley Nuclear Laboratories, RD-B-N4744, 1980).Google Scholar
  12. 12.
    R.C.M. Li and K.H. Yen, IEEE Trans. Microwave Theory Tech. MTT-20, 477 (1972).CrossRefGoogle Scholar

Copyright information

© Plenum Press, New York 1991

Authors and Affiliations

  • Peter B. Nagy
    • 1
  • Laszlo Adler
    • 1
  1. 1.Department of Welding EngineeringThe Ohio State UniversityColumbusUSA

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