Journal
SENSORS
Volume 22, Issue 9, Pages -Publisher
MDPI
DOI: 10.3390/s22093266
Keywords
digital image correlation; panoramic measurement; experimental mechanics
Funding
- National Key Research and Development Program of China [2018YFB0703500]
- National Natural Science Foundation of China [11925202, 11872009]
- National Science and Technology Major Project [J2019-V-0006-0099]
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In this study, we propose a cost-effective and simple-to-implement mirror-assisted single-camera panoramic digital image correlation method for panoramic/dual-surface profile and deformation measurement. By using mirrors and an adapter, panoramic/dual-surface shape and deformation measurements can be realized in a common world coordinate system.
We propose a cost-effective and simple-to-implement mirror-assisted single-camera panoramic digital image correlation (DIC) method for panoramic/dual-surface profile and deformation measurement. Specifically, two planar mirrors and a single camera attached with a four-mirror adapter are used to capture stereo images of the front and rear surfaces of a test object. These stereo images can be processed by regular stereo-DIC to retrieve shape and kinematics fields of each surface. Further, with the speckle patterns prefabricated on the mirrors, reflection transformation matrices are obtained and applied to transform all reconstructed surfaces into a common world coordinate system. As such, panoramic/dual-surface shape and deformation measurements can be realized. For validation, a high-resolution smartphone camera and an industrial camera were, respectively, used to construct mirror-assisted single-camera panoramic DIC systems. Real experiments, including panoramic shape measurement of an aluminum cylinder, dual-surface shape measurement of an aluminum plate and uniaxial tensile tests of aluminum sheet specimens, were performed, confirming the feasibility and accuracy of the method. Since only a single camera and a few auxiliary reflective mirrors are required, the proposed method provides a cost-effective and convenient way for taking panoramic/dual-surface shape and deformation measurements of regular-sized cylindrical and bar samples.
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