Automatic fringe analysis in holographic interferometry

Abstract

Abstract The quantitative evaluation of holographic interferometer fringes for the determination of components of three-dimensional deformation requires the accurate measurement of many fringe patterns. The use of computer image analysis techniques plays an important part in achieving rapid quantitative interferogram interpretation. One method of extracting displacement components from a double exposure holographic interferogram is described. This involves the determination of fringe order at different positions on the reconstruction, from a number of viewing directions. The techniques of fringe analysis used to give vector displacements are presented.