菲涅耳深区散斑强度统计特性及演化  

Statistical characteristics and variation of speckle intensity in deep fresnel diffraction region

作　　者：宋洪胜[1] 庄桥[1] 刘桂媛[1] 秦希峰[1] 程传福[2] 

机构地区：[1]山东建筑大学理学院,济南250101 [2]山东师范大学物理与电子科学学院,济南250014

出　　处：《物理学报》2014年第9期126-130,共5页Acta Physica Sinica

基　　金：山东省优秀中青年科学家科研奖励基金(批准号:BS2013DX030);国家自然科学基金(批准号:11374193);山东省自然科学基金(批准号:ZR2011AM011)资助的课题~~

摘　　要：利用直透光波和高斯散斑场的叠加理论和基尔霍夫近似研究了菲涅耳深区散斑的构成,给出了菲涅耳深区散斑场及其强度概率密度和对比度的表达式.利用原子力显微镜测量的随机散射表面高度分布数据模拟菲涅耳深区不同散射距离处散斑,并计算绘出其强度概率密度和对比度曲线.理论与模拟相结合研究这两个统计函数的特征和直透光强所占比例的影响,以及它们随散射距离的演化规律.Based on the coherent superposition principle of direct-transmited light with the Gaussian speckle field, and also with the Kirchhoff approximation, the speckle in the deep Fresnel diffraction region is investigated. Expressions of speckle field in the deep Fresnel diffraction region, and the probability density of intensity, and contrast are obtained. In the deep Fresnel diffraction region of different scattering distance the variation of speckles is simulated with the height distribution data of random scattering surface measured by atomic force microscopy, and the curves of these two statistic functions are drawn. Combining the theory with the simulation, characteristics of these two statistic functions, the effect of the fraction of the direct transmit light intensity as well as their variations with the scattering distance are discussed.

关 键 词：菲涅耳深区 散斑 概率密度 对比度 

分 类 号：O436[机械工程—光学工程]