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Shape and displacement measurement of discontinuous surfaces by combining fringe projection and digital image correlation

机译：通过结合条纹投影和数字图像相关性来测量不连续表面的形状和位移

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摘要

We describe how a shape-measurement system (SMS) based on fringe projection can be combined with a two-dimensional digital image correlation (DIC) technique to accurately measure both surface profile and displacement fields at the same time. Whereas the measurement of all three displacement components by traditional DIC requires the use of at least two cameras, the approach presented here provides the full three-dimensional (3-D) displacement field from a single-camera, single-projector SMS with no additional hardware requirements. Furthermore, the single-pixel spatial resolution of the fringe projection technique can be exploited to prevent the correlation peak-splitting phenomenon that occurs when a DIC subimage straddles a global geometrical discontinuity. Thus, unlike traditional 3-D DIC techniques, the proposed method can measure displacement fields on discontinuous surfaces as easily as on smooth ones. Details of the algorithm are given together with experimental results of a rigid-body translation test. Measurements made during a routine fatigue test on a part of a wing panel are also presented.
机译：我们描述了如何将基于条纹投影的形状测量系统（SMS）与二维数字图像相关性（DIC）技术结合使用，以同时精确地测量表面轮廓和位移场。传统DIC对所有三个位移分量的测量都需要至少使用两个摄像头，此处介绍的方法提供了来自单摄像头，单投影仪SMS的完整三维（3-D）位移场，而无需其他任何操作硬件要求。此外，可以利用条纹投影技术的单像素空间分辨率来防止DIC子图像跨越全局几何不连续性时出现的相关峰分裂现象。因此，与传统的3D DIC技术不同，该方法可以像测量光滑表面一样轻松地测量不连续表面上的位移场。给出了该算法的详细信息以及刚体平移测试的实验结果。还介绍了在例行的机翼面板疲劳测试期间进行的测量。

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