透过散射介质的散斑统计特性研究  

Research on statistical characteristics ofspeckle through scattering media

作　　者：林艾扬 罗永锜 王文皓 谢欣欣 杨家瑶 吴欣然 罗劲明 张海宁[1] LIN Aiyang;LUO Yongqi;WANG Wenhao;XIE Xinxin;YANG Jiayao;WU Xinran;LUO Jinming;ZHANG Haining(College of Physics and Electronic Engineering,Jiaying University,Meizhou 514015,China)

机构地区：[1]嘉应学院物理与电子工程学院,广东梅州514015

出　　处：《物理实验》2024年第5期47-53,共7页Physics Experimentation

基　　金：广东省教育科学规划课题(No.2023GXJK492);2023年广东省本科高校教学质量与教学改革工程项目(No.983);嘉应学院教学质量与教学改革工程项目(No.JYJG2023110);嘉应学院大学生创新创业训练计划项目(No.X202310582082)。

摘　　要：复杂散射介质的衍射通常会形成散斑图像,该特性使得其在激光技术、电子和光电子等领域具有重要的应用价值.搭建了透过散射介质衍射形成的散斑测量系统,研究了CCD曝光时间、衍射距离和散射面直径对散斑统计特性的影响.实验结果表明:改变光学系统参量,透过散射片的散斑特性也会随之改变;选择合适的曝光时间能够获取对比度和光强分布适中的散斑图像,其空间衍射特性可用散斑平均尺寸表征,但对于散斑特性的微小变化,则可利用相关系数和数字图像相关结果进行辅助分析.Complex scattering media diffraction usually forms a speckle pattern,which makes it have important application value in fields such as laser technology,electronics and optoelectronics.Thus,a measurement system of speckle through scattering media was set up,and the effects of CCD exposure time,diffraction distance and scattering surface diameter on the statistical characteristics of speckle were studied.The results showed that the speckle characteristics through the scattering media changed with the optical system parameters,and a speckle pattern with the modest contrast ratio and intensity could be obtained by choosing the proper exposure time.The spatial diffraction could be characterized by the average size of the speckle,while the subtle change of the speckle characteristics could be analyzed by means of the correlation coefficient and the digital image correlation result.

关 键 词：散射介质 衍射 散斑 统计特性 

分 类 号：O438.1[机械工程—光学工程]