物理学报2011，Vol.60Issue(8)：340-346,7.
火灾烟雾颗粒532nm光散射矩阵实验研究
Experimental determination of scattering matrix of fire smoke particles at 532 nm
摘要
Abstract
Based on polarization modulation and lock-in detection,an experimental apparatus is built to determine several important angular dependent scattering matrix elements at 532 nm.The apparatus is tested by water droplets through comparing measurement results with Mie calculations.Measurement results of scattering matrix elements and element ratios between smoke particles produced by smoldering cotton test fire and those produced from flaming n-heptane test fire are presented.We find that results of Mie calculations are able to describe the experimental data of smoldering cotton test fire smoke,which indicates that the particles generated by smoldering cotton test fire are mostly spherical in shape with considering the particle size relative to the wavelength.Using the optimization method,we estimate the refractive index （m=1.49＋i0.01） and size distribution （lognormal distribution,σg=2.335 and dg=0.17μm） of smoldering cotton test fire smoke.Contrarily,the experimental data of flaming n-heptane fire smoke cannot be described by Mie scattering,which is interpreted by the nonspherical,fractal aggregate morphology of the particulates.关键词
光散射/散射矩阵/烟雾Key words
ligth scattering/scattering matrix/smoke分类
化学化工引用本文复制引用
张启兴,李耀东,邓小玖,张永明..火灾烟雾颗粒532nm光散射矩阵实验研究[J].物理学报,2011,60(8):340-346,7.基金项目
国家自然科学基金 （）
火灾科学国家重点实验室基金（批准号：HZ2009-KF08）资助的课题 （）
