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Simulational and Experimental Studies on Speckles Produced by Coherent Illuminations

Author: LiDaWei
Tutor: ChengChuanFu
School: Shandong Normal University
Course: Optics
Keywords: random surface Young’s fringe light scattering contrast resolution
CLC: O436.1
Type: Master's thesis
Year: 2005
Downloads: 195
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Abstract


Great attentions have been paid to the measurement and study of speckles, which hasfound profound applications in various fields such as characterizations of randomsurfaces and speckle interferometry, etc. Among all the methods for the studies ofrandom surfaces, speckle method is one of the most important owing to its advantages ofnoncontact, nondestruction and low expense. Its principle is to make use of the relationsbetween the statistical properties of the surfaces and the scattered speckle fields to extractsurface parameters. Speckle interferometry is a subject that uses the variations of thespeckle intensities to acquire the displacements or strains of an object undergoing adeformation. It is well known that analysis of speckle Young’s fringe is the foundation ofspeckle photography, and it is of great significance for the speckle interferometry. Thisdissertation focuses on the studies of the properties of speckle fields and theirmeasurements and applications. We first propose the deconvolution method to improvethe resolution in measuring speckle intensity. Then by a computational simulation, westudy the dependence of the image speckle contrast on parameters of the random surfaces.We also study the nonhomogeneity of the speckle Young’s fringes based on the statistical theoryof speckles and find the corresponding experimental evidence. This dissertation is divided intofour chapters.In chapter 1, we give an introduction to the statistical properties of random surfaces, tothe light scattering theory and the principles of the charge coupled device(CCD). We thengive a summary of the speckle interferometry and its application in the analysis ofdisplacement and strain.In chapter 2, we perform the simulational studies on the formation of image specklesand the properties of their contrast. From the results we find the dependence of speckle

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CLC: > Mathematical sciences and chemical > Physics > Optics > Physical optics ( wave optics ) > Interference and diffraction
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