Statistical analysis of the effect of intensity pattern noise on the displacement measurement precision of digital image correlation using self-correlated images

被引：133
作者：
Wang, Z. Y. [1 ]
Li, H. Q. [1 ]
Tong, J. W. [1 ]
Ruan, J. T. [1 ]
机构：
[1] Tianjin Univ, Sch Mech Engn, Dept Mech, Tianjin 300072, Peoples R China
来源：
EXPERIMENTAL MECHANICS | 2007年 / 47卷 / 05期
基金：
中国国家自然科学基金;
关键词：
digital image correlation; displacement measurement precision; intensity pattern noise;
D O I：
10.1007/s11340-006-9005-9
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
This paper discusses the effect of intensity pattern noise on the displacement measurement precision of digital image correlation (DIC). Through mathematical deduction, a formula is presented to estimate the displacement measurement error caused by intensity pattern noise. The resulting formula synthetically reflects the effects of the variance of noise, the intensity variance and the subset size on the displacement measurement precision. To verify the correctness of the resulting formula, two experiments are done. The first one is a real self-correlation experiment, and aims to analyze the effect of the subset size, while the second is a numerical self-correlation experiment, and is to analyze to the effect of the different noise levels. The experimental results are in good agreement with the theoretical predictions.
引用
收藏
页码：701 / 707
页数：7
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