火灾烟颗粒群多分散与单分散光散射模型的比较研究  

Comparative Study on Polydisperse and Monodisperse of Smoke Particles for Light Scattering Model

作　　者：张延岗[1] 邓小玖[1] 李耀东[2] 孙悟[1] 张永明[2] 

机构地区：[1]合肥工业大学电子科学与应用物理学院,安徽合肥230009 [2]中国科学技术大学火灾科学国家重点实验室,安徽合肥230027

出　　处：《中国激光》2012年第4期158-162,共5页Chinese Journal of Lasers

基　　金：火灾科学国家重点实验室开放课题(HZ2009-KF08);上海烟草集团开放课题(科2011-1-010)资助课题

摘　　要：基于T矩阵法,取入射激光的波长分别为300、633、800nm,对正庚烷火烟颗粒群分形结构的多分散模型、单分散模型以及等体积的球形模型的光散射Muller矩阵元素随散射角的分布特性进行了详细的比较分析。结果表明,当λ=300nm时,散射光能很好地反映正庚烷火烟颗粒凝团的分形结构及凝团中基本颗粒的分布特性;当λ=633nm时,正庚烷火烟颗粒群分形结构的多分散模型和单分散模型的光散射特性基本一致;当λ=800nm时,正庚烷火烟颗粒群3种模型的光散射特性趋于一致。Based on the method of T-matrix,a detailed comparison of the distribution of light scattering Muller matrix elements with scattering angle on the polydisperse model,the monodisperse model and the equal-volume-sphere model of fractal structure of smoke particles is produced by flaming n-heptane,under the laser wavelength of 300,633 and 800 nm respectively.The results show that scattering light could reflect the characteristics of the fractal structure of smoke particles and the distribution characteristics of primary particles in smoke particles when λ is equal to 300 nm,then the light scattering characteristics of fractal structure of polydisperse model and monodisperse model become identically when λ is equal to 633 nm,meanwhile,the light scattering characteristics of three models about the smoke particles produced by flaming n-heptane tend to be consistency when λ is equal to 800 nm.

关 键 词：散射 火灾烟颗粒 T矩阵 光散射模型 

分 类 号：O436[机械工程—光学工程]