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 sensitivity. 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 carried out to verify the applicability and effectiveness of the developed full non-contact laser-based Lamb waves phased array inspection technique. Two compact phased array imaging algorithms, the total focusing method and the sign coherence factor algorithm, were adopted to image the defects with processed signals. The experimental results accurately located the positions of the defects.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Grant Nos. 51475012, 11772014, 51235001, and 11272021), the Scientific Research Project of Beijing Educational Committee (Grant No. KM201010005003), and the Importation and Development of High-Caliber Talents Project of Beijing Municipal Institutions (Grant No. CIT&TCD201304048).
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Liu, Z., Chen, H., Sun, K. et al. Full non-contact laser-based Lamb waves phased array inspection of aluminum plate. J Vis 21, 751–761 (2018). https://doi.org/10.1007/s12650-018-0497-z
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DOI: https://doi.org/10.1007/s12650-018-0497-z