激光投影成像中二次散斑传输特性分析及实验研究  

Analysis and experimental study of secondary speckle propagation characteristics in laser projection imaging

作　　者：黄艳 HUANG Yan(Electronic Engineering Department.Zhangzhou Institute of Technology.Zhangzhou,Fujian 363000,China)

机构地区：[1]漳州职业技术学院电子工程学院,福建漳州363000

出　　处：《光电子．激光》2021年第11期1204-1208,共5页Journal of Optoelectronics·Laser

基　　金：福建省中青年教师教育科研项目(JAT201264)资助项目。

摘　　要：为探究激光投影成像中二次散斑传输特性规律,搭建了测试系统,采用半导体激光器作为光源,对不同粗糙度散射屏幕表面产生的二次散射场散斑衬比度进行了测量。实验结果发现,随着散射屏幕和观测平面距离的增加,散斑衬比度呈现出先减小后增大最后趋于平稳不变的一个趋势。并在散斑形成及传播机理的基础上,理论分析了该种特定时间相干长度光源产生的激光散斑在空间中的传输特性。分析表明,散斑图样衬比度最小值位置与散射表面粗糙度相联系,该现象可为物体表面粗糙度的测量提供参考。In order to investigate the characteristics of secondary speckle transmission in laser projection imaging,a test system is built.Semiconductor laser is used as light source to measure the speckle contrast ratio of secondary scattering field produced by scattering screen on different roughness surfaces.The experimental results show that with the increase of the distance between the scattering screen and the observation plane,the speckle contrast ratio decreases first,then increases,and finally tends to be stable and constant.On the basis of the formation and propagation mechanism of speckle,the transmission characteristics of laser speckle produced by this specific time coherent length light source in space are analyzed theoretically.The analysis shows that the minimum position of speckle pattern contrast is related to the scattering surface roughness,which can provide a reference for the measurement of surface roughness.

关 键 词：激光光学 激光散斑 传输特性 等效时间相干面积 有效散射面积 散斑衬比度 

分 类 号：O436[机械工程—光学工程]