Generation of Axial Shear Acoustic Resonance by Magnetostrictively Coupled Emat

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


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].


Resonant Frequency Attenuation Coefficient Peak Amplitude Field Dependence Resonant Mode 
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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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