Optical Differentiation of Quasi-periodic Patterns Using Talbot Interferometry

Abstract

Abstract Two techniques for implementing the concept of grating shearing interferometry to optical differentiation of information-encoded quasi-periodic patterns are described. Two identical copies of the investigated pattern replace diffraction gratings used in the Talbot interferometer configuration. Two methods, one using moiré fringe detection and the other spatial filtering, are presented and compared with other differentiation techniques.