Anisimov Andrei G, Serikova Mariya G, Groves Roger M
Appl Opt. 2019 Jan 20;58(3):498-508. doi: 10.1364/AO.58.000498.
Shearography is a non-destructive testing technique that provides full-field surface strain characterization. Previous inspection of flat objects or simple geometric shapes has been reported. However, real-life objects especially in aerospace, transport, or cultural heritage are not flat, but their inspection with shearography is of interest for both hidden defect detection and material characterization. Accurate strain measurement of a highly curved or free-form surface needs to be performed by combining in-line object shape measuring and processing of the shearography data in 3D. Previous research has not provided a general solution for that. This paper presents a new approach of 3D shape shearography which is based on the integration of a structured light projector for in-line shape measuring with 3D shearography. For the experimental part, a 3D shape shearography system prototype was developed and its performance was evaluated with a cylinder specimen loaded by internal pressure and compared with strain gauges.
剪切电子散斑干涉术是一种无损检测技术，可提供全场表面应变特征。此前已有对扁平物体或简单几何形状的检测报道。然而，现实生活中的物体，尤其是航空航天、交通运输或文化遗产领域的物体并非扁平的，而用剪切电子散斑干涉术对其进行检测对于隐藏缺陷检测和材料表征都很有意义。需要通过结合在线物体形状测量和三维剪切电子散斑干涉数据处理来对高度弯曲或自由形状的表面进行精确应变测量。以往的研究尚未提供对此的通用解决方案。本文提出了一种三维形状剪切电子散斑干涉术的新方法，该方法基于用于在线形状测量的结构光投影仪与三维剪切电子散斑干涉术的集成。在实验部分，开发了一个三维形状剪切电子散斑干涉系统原型，并通过内部压力加载的圆柱体试样对其性能进行了评估，并与应变片进行了比较。
