Defect Detection Using the Lamb Mode S0 by Pulsed Laser Laterally Illuminating on a Side of the Plate

被引:1
作者
Xie, Qingnan [1 ]
Yan, Shiling [1 ]
Lu, Jian [1 ]
Ni, Chenyin [1 ]
Ni, Xiaowu [1 ]
Shen, Zhonghua [1 ]
机构
[1] Nanjing Univ Sci & Technol, Sch Sci, Nanjing 210094, Jiangsu, Peoples R China
基金
中国国家自然科学基金;
关键词
Lamb wave; Laser ultrasound; NDE; S-0; mode; LOW-FREQUENCY REFLECTION; WAFER ACTIVE SENSORS; DISPERSION COMPENSATION; WAVE EXCITATION; FINITE-ELEMENT; GENERATION;
D O I
10.1007/s10765-018-2441-9
中图分类号
O414.1 [热力学];
学科分类号
摘要
In recent years, Lamb waves have been widely used to inspect plate-like structures, where antisymmetric modes are usually applied due to their high out-of-plane displacement and long propagating distance under normal circumstances. However, their dispersive behavior and leakage character in liquid-loaded plates make them unable to distinguish defects in some cases. In this paper, the pure S-0 mode with a high amplitude and small dispersion is generated, which is implemented by a pulsed laser laterally illuminating on a side of the plate symmetrically. Experiments are carried out in a 0.2 mm aluminum plate. The experimental result shows strong agreement with simulation, which indicates that this method can restrain the A(0) mode and improve the S-0 mode efficiently. Moreover, experimental measurements for defect detection in the plates fully immersed in water are carried out preliminarily. These results indicate that this optical method for generating the pure S-0 mode could be useful for defect detection in air and underwater conditions.
引用
收藏
页数:11
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