Journal
OPTICS AND LASERS IN ENGINEERING
Volume 60, Issue -, Pages 32-37Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.optlaseng.2014.03.015
Keywords
Digital image correlation; Mean intensity gradient; Mean intensity of second derivative
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Funding
- National Natural Science Foundation of China [11362007]
- Basic and Applied Science Research Fund of Yunnan Province of China [2011FB029]
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20105314110006]
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In this work, the mean intensity of the second derivative of speckle pattern was used to quantify the quality of the speckle patterns for digital image correlation. Numerical experimental studies were performed to justify the correctness and effectiveness of this new global parameter. The results indicate that the measured displacement error was related to the mean intensity of the second derivative of the speckle patterns when they had equal mean intensity gradients. The results also indicate that the measurement accuracy was affected by both the mean intensity gradient and the mean intensity of the second derivative. Therefore, high quality speckle patterns should have a large mean intensity gradient and a small mean intensity of the second derivative. (C) 2014 Elsevier Ltd. All rights reserved.
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