有尺度分布的水雾激光散射及其动态测试

发布时间：2018-03-14 19:59

本文选题：激光传输　切入点：尺度分布　出处：《激光与红外》2017年05期 　论文类型：期刊论文

【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。
[Abstract]:The theoretical model of 1064nm laser backscattering by single particle and water mist particle with scale distribution is studied. According to the scattering phase function associated with Stocks vector and the scattering parameters of different scales, the scattering cross-section is correlated with the Stocks vector. The total scattering phase function of water mist particles with scale distribution is obtained by using the particle distribution scale instead of the scattering phase function. The scattering angle is between 150 掳and 180 掳, and the sparse large scale water mist particles are characterized by single scattering. The mixed water mist particle with scale distribution has relatively large backscattering effect. Using photodetector module, attenuator set, reflector, polarizer and so on, a water mist generating device and a scattering effect test system are designed. The influence caused by the experimental environment is reduced and avoided by independent laser injection window, tail mirror, inner wall extinction and so on. The dynamic measurement of the backscattering effect of water mist particles to the laser is carried out by using this device. The results are in good agreement with the theory. By analyzing the random fluctuation phenomenon, dynamic law and characteristics of the backscattering of water mist particles to the laser, it is pointed out that the backscattering of water mist particles to the laser is a complex dynamic process. It is the joint effect of water mist scattering and strong absorption in different scales on the transmission path.
【作者单位】：中南大学物理与电子学院;
【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
【分类号】：TN24

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