DIGITAL IMAGE COMPARATOR FOR EXPERIMENTAL ANALYSIS OF DEFORMATIONS

摘要

Optical methods of deformation measurements represent one of the oldest and the most widespread area of experimental mechanics. The optic methods of strain measurements are generally-interferometry, stereo image analysis and digital image analysis. The above-mentioned optical methods are of particular importance for deformation analysis in microstructures and microobjects, where they are the only possible experimental tools. The basis of the stereoscopic technique of deformation measurements is the taking of pair stereoscopic photographs of objects, using the time base principle, i.e. photographs of objects before and after the deformation under the entirely same conditions are taken. The further step in stereoimage method of the strain analysis is the stereocomparation of the pair of images. Up to now we have used for it the analog apparatus ZEISS-Stecometr. The paper which is presented describe a digital system of reading and comparation of the pairs of stereoimages.