Observation of Two-Dimensional Spatial Distribution of Plane Crack Tips With Low-Power Pulsed Laser

  • H. Fujii
  • T. Miyake
  • M. Matsukawa
Part of the Acoustical Imaging book series (ACIM, volume 29)


We propose a simple and comparatively high spatial resolution method to nondestructively detect small plane cracks in solid materials. In this method, we used two techniques, a two-layered self-made transducer and low-power laser pulses. The two-layered transducer has two roles, it transmits lowfrequency, high-amplitude longitudinal waves from a PZT transducer and it is a wideband receiver made of PVDF film. The low-frequency excitation causes the fluctuation of cracks. Combining these techniques, we succeeded in detecting plane crack tips and presenting them as two-dimensional images.

Key words

Plane crack tips Low-power pulsed laser Two-layered transducer Two-dimensional mapping 


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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  • H. Fujii
    • 1
  • T. Miyake
    • 1
  • M. Matsukawa
    • 1
  1. 1.Faculty of EngineeringDoshisha UniversityKyotoJapan

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