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首页> 外文期刊>Mechanical systems and signal processing >Non-destructive testing of plates based on the visualisation of Lamb waves by double-pulsed TV holography
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Non-destructive testing of plates based on the visualisation of Lamb waves by double-pulsed TV holography

机译：基于双脉冲电视全息图的兰姆波可视化对板进行无损检测

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摘要

We describe a new technique, currently under development, intended to detect the presence of flaws such as cracks and holes in thin-walled mechanical components. This technique combines ultrasonics with optics, both at a low power density, that allows to perform the tests in the non-destructive range. Lamb waves, a kind of surface acoustic waves that propagate in thin plates, are generated to explore metallic samples while double-pulsed TV holography, a whole-field interferometric technique, is used to detect them. This scheme provides maps of the instantaneous surface displacements produced by the waves, where the effects of the flaws can be visualised by contrast against the smooth propagation of the wavefront in defect free plates. Images with reasonable resolution can be achieved almost in real-time. Several examples of detection of typical flaws in plates using the proposed method complete this work.
机译：我们描述了一种目前正在开发中的新技术，旨在检测薄壁机械部件中是否存在诸如裂纹和孔洞之类的缺陷。该技术在低功率密度下将超声波与光学元件结合在一起，从而可以在无损范围内进行测试。产生兰姆波（一种在薄板中传播的表面声波）来探测金属样品，同时使用双脉冲电视全息技术（一种全场干涉技术）对其进行检测。该方案提供了由波产生的瞬时表面位移的图，其中通过对比无缺陷板中波前的平滑传播，可以看到缺陷的影响。具有合理分辨率的图像几乎可以实时获得。使用所提出的方法检测板中典型缺陷的几个示例完成了这项工作。

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