Use of rigid-body motion for the investigation and estimation of the measurement errors related to digital image correlation technique
Use of rigid-body motion for the investigation and estimation of the measurement errors related to digital image correlation technique
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DOI：
10.1016/j.optlaseng.2007.05.008
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发表时间：
2008-02-01
影响因子：
4.6
通讯作者：
Belhabib, S.
中科院分区：
文献类型：
--
作者：
Haddadi, H.;Belhabib, S.
这项工作的目的是调查与数字图像相关(DIC)技术应用于应变测量的误差来源。在可以利用测量的运动场之前，了解这些信息是很重要的。在回顾了DIC的原理后，列举了与该技术有关的一些误差来源。提出了基于刚体运动的数值和实验测试方法。这些测试简单且易于实施。它们允许快速评估与照明、光学透镜(失真)、CCD传感器、离面位移、散斑图案、网格间距、子集的大小和相关算法有关的误差。不能解耦的误差源通过放大它们对全局误差的贡献来估计。所获得的结果允许解决与所用设备相关的错误的分类。文章最后提出了一些建议，以期将误差降至最低。(C)2007爱思唯尔有限公司。保留所有权利。
The aim of this work is to investigate the sources of errors related to digital image correlation (DIC) technique applied to strain measurements. The knowledge of such information is important before the measured kinematic fields can be exploited. After recalling the principle of DIC, some sources of errors related to this technique are listed. Both numerical and experimental tests, based on rigid-body motion, are proposed. These tests are simple and easy-to-implement. They permit to quickly assess the errors related to lighting, the optical lens (distortion), the CCD sensor, the out-of-plane displacement, the speckle pattern, the grid pitch, the size of the subset and the correlation algorithm. The errors sources that cannot be uncoupled were estimated by amplifying their contribution to the global error. The obtained results permit to address a classification of the error related to the used equipment. The paper ends by some suggestions proposed in order to minimize the errors. (c) 2007 Elsevier Ltd. All rights reserved.