Image Correlation Technique for Slope and Curvature of a Cantilever Beam Using Light Intensity

Image correlation technique is an optical method based on grey value digital images that can determine the shape, displacement and the strain of an object under load. In this technique, the slope and curvature of a cantilever beam can be obtained based on the intensity values of loaded and unloaded images. According to the conservation principle, for small deformation, the total amount of light reflected for the specified area on the surface would be the same before and after loading when the illumination is unaltered. The method, image correlation technique is obtained on this basis.