摘要
采用蒙特卡罗法研究了人工细水雾对制导用激光的双程衰减过程。通过计算多分散细水雾的米氏累积概率分布函数(CPDF),利用Matlab软件对相函数进行自定义函数拟合,建立了一种新的光子随机散射方向的确定方法。对两种蒙特卡罗光子追踪方法进行了效率对比分析,发现权重法的计算效率要优于事件法。普通细水雾的半径一般为101～102μm,其对10.6μm激光有着很好的衰减效果,可用于激光制导隐身;而对1.06μm激光,由于单次反照率接近于1,当水雾体积分数较高时,在多重散射作用下甚至会出现增强反射的现象。
The round-trip attenuating process of laser used for guiding by artificial water sprays is studied with the Monte-Carlo method. A new way for confirming the directions of scattered photons is established. The method is based on calculating the cumulative probability distribution function （CPDF） of polydisperse mists and user-defined function （UDF） fitting by Matlab. Software efficiencies of two kinds of Monte-Carlo methods for photons tracking are analyzed and compared. A conclusion comes to that the wight method is evidently more efficient than the event method. The radii of frequently-used water mists are usually in the range of 10^1 - 10^2 μm which are suited to attenuate the 10.6μm laser and can be used for laser stealth. But the effect is worse for 1.06μm laser, under the condition of dense water sprays, for the single scattering albedo is close to 1.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2013年第4期24-29,共6页
Chinese Journal of Lasers
基金
国防预研基金(1010502020202)资助课题
关键词
激光光学
激光制导
细水雾
隐身
蒙特卡洛法
自定义函数拟合
laser optics
laser guiding
fine water sprays
stealth
Monte-Carlo method
user-defined function fitting
