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Generation of Axial Shear Acoustic Resonance by Magnetostrictively Coupled Emat

  • H. Ogi
  • M. Hirao
  • K. Minoura

Abstract

In this paper, we present a technique to generate the axial shear acoustic resonance in a cylindrical rod and pipe by a magnetostrictively coupled EMAT. The technique is based on the electromagnetic acoustic resonance (EMAR) [1–7]. The EMAR is a combination of the ultrasonic resonance technique and a noncontacting EMAT. The heavily and coherently overlapping echoes at a resonant state improves the signal-to-noise ratio to a large extent and compensates enough for the weak coupling efficiency with the EMATs. The EMAR method was first proposed by Filimonov et al. [1] and Nikiforenko et al. [2]. In recent years, several researchers have developed this technique for the wide range of the noncontact inspection and materials characterization [3–7].

Keywords

Resonant Frequency Attenuation Coefficient Peak Amplitude Field Dependence Resonant Mode 
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References

  1. 1.
    S. A Filimonov, B. A. Budenkov, and N. A Glukhov, Sov. J. Nondestr. Test., 1, 102 (1971).Google Scholar
  2. 2.
    Z. G. Nikiforenko, N. A Glukhov, and I.I. Averbukh, Sov. J. Nondestr. Test., 4,427 (1971).Google Scholar
  3. 3.
    K. Kawashima, J. Acoust. Soc. Am., 87, 681 (1990).Google Scholar
  4. 4.
    M. Hirao, H. Ogi, and H. Fukuoka, Rev. Sci. Instrum., 64,3198 (1993).CrossRefGoogle Scholar
  5. 5.
    W. Johnson, B. A. Auld, and G. A Alers, in Review of Progres in QNDE, Vol. 13, eds. D. O. Thompson and D. E. Chimenti (Plenum, New York, 1994), p. 1603.Google Scholar
  6. 6.
    W. Johnson, B. A Auld, and G. A. Alers, J. Acoust. Soc. Am., 95, 1413 (1994).CrossRefGoogle Scholar
  7. 7.
    H. Ogi, M. Hirao, and T. Honda, J. Acoust. Soc. Am, 98,,458 (1995).CrossRefGoogle Scholar
  8. 8.
    R. B. Thompson, Appl. Phys. Lett., 34, 175 (1979).CrossRefGoogle Scholar
  9. 9.
    R. B. Thompson, IEEE Trans. Sonics and Ultrason., SU-25, 7 (1978).CrossRefGoogle Scholar
  10. 10.
    H. Ogi, M. Hirao, and K. Minoura, to be submitted.Google Scholar

Copyright information

© Plenum Press, New York 1996

Authors and Affiliations

  • H. Ogi
    • 1
  • M. Hirao
    • 1
  • K. Minoura
    • 1
  1. 1.Faculty of Engineering ScienceOsaka UniversityToyonaka, OsakaJapan

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