用液晶空间光调制器生成粗糙度可调散射体  

Generation of scattering object with adjustable roughness using liquid crystal spatial light modulator

作　　者：曹强[1] 钱晓凡[1] 宋庆和[1] 林超[1] 

机构地区：[1]昆明理工大学理学院激光研究所,云南昆明650500

出　　处：《光电子．激光》2016年第12期1340-1345,共6页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金(61067004)资助项目

摘　　要：数字全息干涉计量中完成相位解包裹前一般都需要做去除噪声工作,其中最难去除的是散斑噪声。为了找到更好的散斑降噪算法往往需要生成不同信噪比的散斑噪声。本文提出了用液晶空间光调制器(LC-SLM)生成散射体及其散斑场的方法。实验结果表明无论是散斑场强度的概率密度函数还是其平均对比度,以及散斑场的相位概率密度函数,实验值与理论值吻合得都很好,说明用LC-SLM生成散射体并观测其散斑场是可行的,而且该方法具有可以在一定范围内任意调整散射体粗糙度的优点。Speckle noise removal is the most difficult part of the de-noising op eration in the phase unwrapping of digital holographic interferometry.In order to get better de-noising algorithms,speck le noise with different signal to noise ratio （SNR） shou ld be produced.This study proposed a method that uses liquid crystal spatial lig ht modulator （LC-SLM） to generate a scattering object with adjustable roughness and different signal-noise ratio speckle field .Experimental results of the probability density distribution,the contrast of speckle intensity and the probability density dis tribution of the speckle phase are in good agreement with the theoretical calculation values.It is concluded that generatio n of scattering object with LC-SLM is viable. Moreover,this method has the advantage that the roughness of the scattering object is adjustable in a certain range.

关 键 词：数字全息干涉计量 散射体 粗糙度 散斑场 液晶空间光调制器(LC-SLM) 

分 类 号：O438.1[机械工程—光学工程] O436.1[理学—光学]