J Vis (2018) 21:751–761 https://doi.org/10.1007/s12650-018-0497-z REGULAR PAPER • • • • Zenghua Liu Honglei Chen Kunming Sun Cunfu He Bin Wu Full non-contact laser-based Lamb waves phased array inspection of aluminum plate Received: 3 December 2017 / Revised: 12 March 2018 / Accepted: 27 April 2018 / Published online: 30 May 2018 The Visualization Society of Japan 2018 Abstract Lamb waves defect detection technique is suitable to detect long-range defects and multi-defects in plates because of its attractive properties such as multi-modes, low attenuation, and multi-defect sensi- tivity. As the laser beams have the tiny size and noncontact property, in this paper a full non-contact laser- based Lamb waves phased array inspection technique was proposed for defect detection in an aluminum plate. A Q-switched Nd: YAG pulse laser generating Lamb waves and a continuous laser inspection system was used to inspect the out-of-plane displacements. The laser-generated Lamb waves have the broadband property and low temporal resolution that are not suitable for defects detection directly. So the continuous wavelet transform was used to extract narrowband signals from laser-generated Lamb wave and a linear mapping algorithm was adopted to compensate for the dispersion of the extracted narrowband signals. Two experiments were
Journal of Visualization – Springer Journals
Published: May 30, 2018
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