Modulating Optical Signal to Improve the Images by Using a Self Crossed Diffraction Grating

A method for recording good images on high resolutionphotographic plate and their retrieval was described.This method depend on the modulating optical signal by a crossed diffraction grating. Two symmetrical first and second orders werefiltered to modulate the real amplitude object.These ordersrepresent the optical modulated signalson the photographic plateby a given frequency of crossed diffraction grating and another frequency from itself crossed diffraction grating respectively. Different irradiance distributions for a different modulated signals were appeared. Improved images were obtained from a given modulating signal. The irradiance distributions and visibilitywere calculated theoretically and experimentally.