The DIC works by comparing digital photographs of a component or a test part at different stages of deformation. By tracking blocks of pixels, the system can measure surface displacement and create full-field 2D and 3D deformation vector fields and deformation maps. Conventional instruments that measure deformations (i.e., a full-field strain measurement) are possible using the digital image correlation (DIC) technique. This method belongs to the group of non-interferometric optical techniques that determine deformation by comparing changes in the surface image of an object tested before and after deformation.
The DIC technique allows new and more complex research to be carried out. Digital image correlation is becoming a reliable instrument for measuring deformation and deformation in aerospace testing. A test sample is painted with dots, cameras record how the dots move when loads are applied, and the software correlates these images to produce full-field deformation or deformation data. Digital image correlation is a full-field 3D optical technique for measuring deformation and deformation in almost any material by tracking patterns of gray values.
A stochastic pattern is applied to the surface of the test article. Two cameras are then used to capture images of the test item before, during and after the testing process. Advanced software then calculates the motion of unique surface patterns and determines the coordinates of the 3D surface using stereoscopic triangulation. Digital image correlation (DIC) is a method of analyzing full-field images, based on digital images with gray values, that can determine the outline and displacements of an object under load in three dimensions.
