Steep Geometric Grating for Use in Moire Interferometry

摘要

The theoretical background and the procedure of executing a new moireinterferometry method, which combines the advantages of geometric moire method with the traditional moire interferometry, is reported. The method uses a steep geometric grating of about 40 lines/mm on a mirror finished specimen surface to achieve high contrast moire fringes. A special four beam moire interferometry bench is designed for the low grating frequency used. An application to experimental fracture mechanics analysis is briefly discussed.... Geometric moire, Moire interferometry, Experimental stress analysis.