The influence of the aperture diaphragm on the size of the subjective speckles and the application of this in speckle photography

Abstract

The paper presents the results of a study showing the possibility of reducing the size of speckles to increase the sensitivity and accuracy of the measuring system based at the use of methods of speckle photography and speckle interferometry. The theoretical and experimental results the average size of speckles formed in the double-exposure specklegram depends on the aperture diaphragms of the optical system-circular aperture, annular aperture, square aperture and frame aperture- A re presented. The experimental results forming of the diffraction halo and the Young's fringes for a circular, annular, square and frame apertures are presented.