Deformation Measurement for Multiscale and Multifield Problems using the Digital Image Correlation Method
Based on the tracking of characteristic patterns in a series of images, digital image correlation (DIC) provides full-field displacements in the subpixel accuracy. The subpixel algorithm of DIC uses gradient-based method, inverse compositional Gauss-Newton, and double Fourier transform to achieve tracking results at extremely high resolutions. The noncontact nature of DIC technology provides pixel-based data for use in multi-scale measurement, which is able to analyze structure deformation at scales from meters to nanometers, and to record the duration of two images from hours to microseconds. The DIC technique developed in our laboratory makes it possible to obtain noncontact, full-field measurements with high spatial and temporal resolution. The DIC technique is used in this study to investigate numerous problems in various domains at various scales.
The authors gratefully acknowledge the financial support of this research by National Taiwan University under Excellence Research Program, contract number – 104R8918-01.
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