Journal of the Korean Society for Nondestructive Testing (비파괴검사학회지)

The Korean Society for Nondestructive Testing (한국비파괴검사학회)
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Imaging of a Defect in Thin Plates Using the Time Reversal of Single Mode Lamb Wave: Simulation

  • Jeong, Hyun-Jo (Division of Mechanical and Automotive Engineering, Wonkwang University) ;
  • Lee, Jung-Sik (Division of Mechanical and Automotive Engineering, Wonkwang University) ;
  • Bae, Sung-Min (Division of Mechanical and Automotive Engineering, Wonkwang University) ;
  • Lee, Hyun-Ki (Division of Mechanical and Automotive Engineering, Wonkwang University)
  • Received : 2010.04.05
  • Accepted : 2010.06.10
  • Published : 2010.06.30
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Abstract

This paper presents an analytical investigation for a baseline-free imaging of a defect in plate-like structures using the time-reversal of Lamb waves. We first consider the flexural wave (A0 mode) propagation in a plate containing a defect, and reception and time reversal process of the output signal at the receiver. The received output signal is then composed of two parts: a directly propagated wave and a scattered wave from the defect. The time reversal of these waves recovers the original input signal, and produces two additional side bands that contain the time-of-flight information on the defect location. One of the side band signals is then extracted as a pure defect signal. A defect localization image is then constructed from a beamforming technique based on the time-frequency analysis of the side band signal for each transducer pair in a network of sensors. The simulation results show that the proposed scheme enables the accurate, baseline-free detection of a defect, so that experimental studies are needed to verify the proposed method and to be applied to real structure.

Keywords

References

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