Multi-camera digital image correlation method with distributed fields of view |
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| Institution: | 1. Institute of Micromechanics and Photonics, Warsaw University of Technology, 8 Sw. A. Boboli St., 02-525 Warsaw, Poland;2. Institute of Metrology and Biomedical Engineering, Warsaw University of Technology, 8 Sw. A. Boboli St., 02-525 Warsaw, Poland;1. Institute of Micromechanics and Photonics, Warsaw University of Technology, 8 Sw. A. Boboli St., 02-525 Warsaw, Poland;2. Institute of Aeronautics and Applied Mechanics, Warsaw University of Technology, 24 Nowowiejska St., 00-665 Warsaw, Poland;3. Materials Engineers Group Ltd., 141 Woloska St., 02-507 Warsaw, Poland;4. Building Research Institute, 1 Filtrowa St., 00-611 Warsaw, Poland;1. School of Mechanical Engineering, Dalian University of Technology, Dalian 116024, China;2. Beijing Research Institute of Telemetry, Beijing 100076, China |
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| Abstract: | A multi-camera digital image correlation (DIC) method and system for measurements of large engineering objects with distributed, non-overlapping areas of interest are described. The data obtained with individual 3D DIC systems are stitched by an algorithm which utilizes the positions of fiducial markers determined simultaneously by Stereo-DIC units and laser tracker. The proposed calibration method enables reliable determination of transformations between local (3D DIC) and global coordinate systems. The applicability of the method was proven during in-situ measurements of a hall made of arch-shaped (18 m span) self-supporting metal-plates. The proposed method is highly recommended for 3D measurements of shape and displacements of large and complex engineering objects made from multiple directions and it provides the suitable accuracy of data for further advanced structural integrity analysis of such objects. |
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