取向比对随机取向的六角形冰晶粒子米勒矩阵的影响  

Influence of Aspect Ratio on Mueller Matrices of Hexagonal Ice Crystals in Random Orientation

作　　者：类成新[1] 

机构地区：[1]山东理工大学理学院,山东淄博255049

出　　处：《激光与光电子学进展》2010年第7期129-134,共6页Laser & Optoelectronics Progress

摘　　要：利用离散偶极子近似方法对随机取向的六角形冰晶粒子的米勒矩阵进行了数值计算,给出了各个米勒矩阵元素的角分布曲线,探讨了随机取向的六角形冰晶粒子的取向比对其米勒矩阵的影响。研究表明,随机取向的六角形冰晶粒子的取向比对其米勒矩阵元素的影响在一定散射角范围内均相当大,并随着粒子尺度参数的变化而变化;此外,相同尺度参量、不同取向比粒子的米勒矩阵元素的角分布曲线均有一个交点,并且随着粒子尺度参量的增加,交点所对应的散射角度值逐渐向小角度方向移动。Mueller-matrix elements of hexagonal ice crystals in random orientation are calculated by the discrete dipole approximation （DDA） method and the profiles of Mueller-matrix elements are presented.The influence of the aspect ratio on Mueller matrices of hexagonal ice crystals in cirrus cloud is discussed.The results show that the influence of the aspect ratio on Mueller matrix elements of hexagonal ice crystals in random orientation is quite large in certain angular regions,and it varies with the size parameters of the hexagonal ice crystals in random orientation.In addition,there is a nodical point in the profiles of mueller matrices of hexagonal ice crystals with the same sizes but different aspect ratios,and this point will extend forward with the increase of the size parameters of particles.

关 键 词：大气光学 米勒矩阵 离散偶极子近似 取向比 六角形冰晶粒子 

分 类 号：P422.3[天文地球—大气科学及气象学]