Fringe Spacing and Strain Analysis

It has become exactly 51 years since the first laser was realized. The Light amplification by stimulated emission of radiation (laser) emits coherent electromagnetic radiation.Since its invention, it has been assumed to have tremendous importance in the fields of science, engineering, and technology.Moire Techniques have been used for a number of testing applications. Righi(1887) first noticed that the relative displacement of two gratings could be determined by observing the movement of the moire fringes. The next significant advance in the use of moire was presented by Weller and Shepherd (1948). They used moire to measure the deformation of an object under applied stress-by looking at the differences in a grating pattern before and after the applied stress. In this book, fringe spacings, for different grating angle separation, are determined using FORTRAN written program. The strain stress behavior of a rubber using fringe projection technique is also showed.