Using a sheet of specklegram, the development of fringe analysis method for ESPI

摘要

The ordinary fringe analysis method based on Fourier transform cannot analyze a dosed fringes using only single specklegram produced with two sheets of speckle patterns before and after deformation. On the basis of this discussion, the novel fringe analysis method is proposed in this paper. In the proposed method, not a specklegram but speckle parterns that produce the specklegram are directly analyzed using Fourier transform technology. Then, the ordinary problems can be solved by the proposed method In the experiment, it is confirmed that the new proposed method can analyze an out-of-plane displacement using only two sheets of speckle patterns before and after deformation.