Two-step digital image correlation for micro-region measurement
Two-step digital image correlation for micro-region measurement
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DOI：
10.1016/j.optlaseng.2004.09.002
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发表时间：
2005-08
影响因子：
4.6
通讯作者：
Jinlong Chen;Ganming Xia;Ke Zhou;Guisuo Xia;Yuwen Qin
中科院分区：
文献类型：
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作者：
Jinlong Chen;Ganming Xia;Ke Zhou;Guisuo Xia;Yuwen Qin
提出了一种具有更稳定可靠计算技术的两步数字图像相关方法，该方法由简单搜索法和迭代相关法组成。这种新方法不仅提高了计算速度和测量精度，而且简化了实验过程。为了进一步提高该技术的灵敏度，利用双三次样条插值法的高精度计算对子图像进行亚像素重建，将位移精度扩展到0.01像素以下，微区应变分辨率控制在0.0002以下。应用上述方法对双材料试件和涂层试件的微观变形进行了量化。实验结果表明，两步数字图像相关方法对于极小尺度的研究是一种潜在的有利条件。
A method of two-step digital image correlation is well developed with more stable and reliable calculating technology, which consists of a simple searching method and an iterative correlation method. This new method can not only improve the calculating speed and the measuring accuracy, but also simplify the process of the experiment. In order to further increase the sensitivity of the technique, the sub-pixel reconstruction is performed in sub-image by utilizing the higher precision calculation of bicubic spline interpolation value method, and the accuracy of displacement is extended to better than 0.01 pixel; the strain resolution is limited to less than 0.0002 in micro-region. The above method is applied to quantify the micro-deformation of bimaterial sample and coating sample. The experimental results show that the method of two-step digital image correlation is a potential boon to investigations at extremely small-size scales.