Refraction of the Flat Optical Beam in a Transparent Heterogeneous Environments

Presents a method of visualization and laser diagnostics of optically inhomogeneous media based on the phenomenon of refraction of the structured laser radiation (SLR). The described method of studies of the diffusion layer of the optical refractography method. Experimental setup for digital recording refractive pattern (refractograms). Shown for examples application of methods of the laser refractography thermal processes

Laboratory and flight tests of IPCT method

Image Pattern Correlation Technique (IPCT) is high precision optical measurement of surface shape and surface deformation which is based on computer processing of images with the help of correlation algorithms. It also can be applied for controlling surface movement and rotation. For deformation analysis areas on the test object which are suspected to suffer deformation are covered with special image – pattern (background screen). Pattern can be a random dot image or something else. After deformation surface of test object changing and images of pattern which is getting with the help of camera before and after deformation differ. So after processing these images information about test object deformation can be obtained. Cross correlation processing consist in dividing two images into small parts and calculating function of correlations of corresponding parts. Maximum of correlating function shows us direction and amount of image part displacement. Special mathematical model allow to make qualitative or quantitative vector field of deformation (displacement) using information of displacements

ИССЛЕДОВАНИЯ ТОЧНОСТИ ИЗМЕРЕНИЙ ДИНАМИЧЕСКИХ ДЕФОРМАЦИЙ ПОВЕРХНОСТИ МЕТОДОМ КОРРЕЛЯЦИИ ФОНОВЫХ ИЗОБРАЖЕНИЙ / Accuracy of measurement of dynamic surface deformations by the image pattern correlation technique

Представлены результаты теоретических исследований и лабораторного эксперимента метода корреляции фоновых изображений. Показана зависимость влияния угла наблюдения на полученные результаты. Рассмотрена возможность применения метода корреляции фоновых изображений к полетным испытаниям. / Vorgestellt werden die Ergebnisse von theoretischen Untersuchungen und Laborversuchen zur Image Pattern Correlation Technique (IPCT). Gezeigt wird die Abhängigkeit des Einflusses des Beobachtungswinkels auf die Ergebnisse. Die Möglichkeit der Anwendung der Image Pattern Correlation Technique im Flugversuch wird überprüft