有尺度分布的水雾激光散射及其动态测试  

Laser scattering of water fog particles with size distribution and its dynamic test

作　　者：谢文科[1] 李致远[1] 

机构地区：[1]中南大学物理与电子学院,湖南长沙410083

出　　处：《激光与红外》2017年第5期534-540,共7页Laser & Infrared

基　　金：中国科学院光束控制重点实验室基金项目(No.2014LBC004);国家自然科学基金项目(No.61008037)资助

摘　　要：研究了单粒子和有尺度分布的水雾粒子对1064 nm激光后向散射的理论模型,根据散射截面与Stocks矢量关联的散射相函数和不同尺度散射参数,将粒子分布尺度代入散射相函数进行加权计算得到有尺度分布的水雾粒子总散射相函数。考察散射角在150°~180°之间后向散射,稀疏大尺度水雾粒子表现为单散射特征、有尺度分布混合型水雾粒子具有相对较大的后向散射效应。利用光电探测器组件、衰减片组、反射镜、偏振片等设计了水雾生成装置和散射效应测试系统,通过独立激光入射出射窗口、尾镜、内壁消光等措施减小和避免因实验环境造成的影响。使用该装置进行了水雾粒子对激光后向散射效应的动态测试,结果与理论符合较好。通过分析水雾粒子对激光后向散射的随机涨落现象、动态规律和特点,指出水雾粒子对激光的后向散射是一个复杂的动态过程,是传输路径上不同尺度水雾散射和强吸收的共同影响。The 1064 nm laser backward scattering theoretical models of single particle and water fog particles with size distribution are studied. According to scattering parameters and scattering phase function related to scattering cross section and Stocks vectors, total scattering phase function of water fog particles with size distribution are calculated and obtained through the weighted function of particles size distribution. For laser backward scattering angle between 150° - 180° ,the sparse large water fog particles have single scattering feature ,while water fog particles with the mixed size distribution have large backward scattering effect. The water fog generating equipment and laser backward scatter- ing testing system are designed, including electro-optical detector, attenuator sets, mirrors, polarizing fihns, etc. The special designs are used to reduce environment＇s effects,such as independent incident and outgoing window,rear re- flector and the inner wall extinction. The laser backward scattering effect of water fog particles is measured by using this device, and the gotten results are consistent with theoretical value. The results show that the laser backward seat- tering of water particles is a complicated dynamic process, and it is related to the absorption and scattering of water tog particles with different size distributions in propagation path.

关 键 词：激光传输 尺度分布 水雾粒子 激光后向散射 理论分析 动态测试 应用 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]