A dynamic in-plane deformation measurement using virtual speckle patterns

The novel measurement method based on the virtual speckle patterns has been reported. The method can analyze the phase map in high resolution by using only information concerning the change of intensity of each speckle during a deformation process. In this paper, the possibility of the application for the analysis of dynamic in-plane deformation measurement by the method is investigated. The measuring optical system for dynamic events is discussed. In the experimental results, the phenomenon of in-plane deformation by the collision of the metal sphere to a block of hard rubber is measured. The virtual speckle patterns are produced by only information during a deformation process in order to analyze the deformation process. It is confirmed that the new method can analyze a large deformation which could not analyze by the ordinary methods. Then, it is also confirmed that the high resolution measurement can be performed by this method. The measuring optical system for dynamic events is discussed.