摘要
针对火灾烟颗粒的Stokes散射矩阵,利用电光调制器、1/4波片、偏振片及锁相放大器等设计与搭建了火灾烟颗粒光散射实验平台;并基于该平台测量了棉绳阴燃、正庚烷明火及檀香阴燃生成的3种烟颗粒的Stokes散射矩阵中16个元素的角度分布.实验结果表明,这些烟颗粒在光散射过程中都体现出明显的非球形效应,尤其是阴燃过程生成的灰烟颗粒.这说明基于球形模型的Lorenz-Mie散射理论对于分析烟颗粒光散射特征存在一定的局限性,而为了进一步挖掘火灾烟颗粒光散射过程中的光强与偏振等信息,需要建立合理的非球形模型,从而为光电感烟火灾探测技术的发展提供指导与支撑.
Aiming at the Stokes scattering matrix of smoke particles, an experimental setup was designed and built with an electro-optic modulation, a quarter waveplate, polarizers and a lock-in amplifier. Through the setup, the angular distributions of the Stokes scattering matrix were measured for the smoke particles generated from smoldering cottons, flaming heptane and smoldering sandals. The results show that the non-sphericity of smoke particles, especially the gray smoke particles, plays an important role on the light scattering. There are some shortcomings for Lorenz-Mie theory, which is based on a spherical model, to analyze the light scattering by smoke particles. In this case, it is suggested that non-spherical models are required to analyze the characteristics, e.g. intensity and polarization ere, of light scattering by smoke particles.
出处
《红外与毫米波学报》
SCIE
EI
CAS
CSCD
北大核心
2007年第4期279-283,共5页
Journal of Infrared and Millimeter Waves
基金
国家自然科学基金重点(50536030)资助项目
关键词
Stokes散射矩阵
烟颗粒
光电感烟
Stokes scattering matrix
smoke particles
photoelectric smoke detection
作者简介
谢启源（1978-），男，福建上杭人，中国科学技术大学火灾科学国家重点实验室博士后，主要研究方向为火灾探测，建筑火灾等．
