二氧化硅粉尘对有形激光的反射和透射特性研究  

Reflection and Transmission Characteristics of a Shaped Laser Beam Scattered by SiO_2 Dust

作　　者：肖赛[1] 孙贤明[1] 王海华[1] 万隆[1] 

机构地区：[1]山东理工大学电气与电子工程学院,淄博255049

出　　处：《光散射学报》2015年第3期201-205,共5页The Journal of Light Scattering

基　　金：国家自然科学基金(61205191);山东省自然科学基金(ZR2013FL023)资助项目

摘　　要：利用蒙特卡罗方法研究了二氧化硅粉尘层对无限窄准直光束的反射和透射特性,根据Mie理论计算了单次散射相函数,并利用其对光子散射方向进行了抽样,分析了消光系数和粒子尺寸对粉尘层反射和透射特性的影响,对于浓度较大的粉尘层,激光在传输过程中,其光斑的大小和形状将对散射特性产生影响,将无限窄准直光束入射情况下的散射函数作为脉冲响应,与有形激光光束进行卷积,得到有形激光束入射情况下的多次散射特性,研究了高斯形和圆盘形两种激光光束入射时,光斑形状和大小对散射特性的影响。The reflection and transmission characteristics of infinite narrow collimated light beam scattered by SiO2 dust are studied by Monte Carlo method. The scattering angles are sampled by Mie phase function. The affections of the extinction coefficient and particle size to the dust scattering characteristics are analyzed. The laser spot will affect the scattering characteristics when it propagates in the high concentration dust layer. The scattering function is looked as the impulse response when the infinite narrow collimated light beam incident on the dust layer,and the scattering function is convoluted with the shaped laser beam to obtain the multiple scattering characteristics. The affection of laser spot shape and size to the scattering characteristics are studied for Gaussian and circular flat laser beam incidence.

关 键 词：散射 激光 粉尘 蒙特卡罗 

分 类 号：TN011.3[电子电信—物理电子学]