Journal
OPTICS AND LASERS IN ENGINEERING
Volume 110, Issue -, Pages 113-121Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.optlaseng.2018.05.016
Keywords
Digital image correlation; Spatial uncertainty; Mean bias error; Standard deviation error; Speckle pattern
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Funding
- National Natural Science Foundation of China [11627803, 11702287, 11332010, 11472266]
- Chinese Academy of Sciences [XDB22040502]
- Fundamental Research Funds for the Central Universities [WK2480000004]
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Digital image correlation is a widely used optical metrology for shape, motion, and deformation measurement. Although a number of studies have been carried out on the measurement errors of digital image correlation, the spatial uncertainty of the measurement errors, which stems from the randomness of speckle patterns, is seldom researched. In this work, a theoretical model is built for the spatial uncertainty of measurement errors. Analytical formulae for the spatial variances of both the mean bias error and the standard deviation error are derived. The influences of subset size, speckle coverage, and speckle radius on the spatial uncertainty are investigated. Numerical simulations demonstrate the correctness of the proposed model.
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