Mie散射理论测量粒子系复折射率的透射方法  

Measurement of the complex refractive index of particles based on Mie theory and transmission method

作　　者：刘晓东[1] 戴景民[1] 

机构地区：[1]哈尔滨工业大学自动检测与过程控制系统研究所,黑龙江哈尔滨150001

出　　处：《红外与激光工程》2009年第5期820-824,共5页Infrared and Laser Engineering

基　　金：国家自然科学基金重点资助项目(50336010)

摘　　要：粒子的光学常数并不等同于构成粒子材料的光学常数,而通过粒子光谱复折射率数据,研究粒子及聚集粒子系的辐射特性,不仅对辐射物性的研究具有较高的理论意义,而且具有广泛的实际应用价值。粒子的复折射率不能直接通过实验测量(没有直接测量的仪器),须由实验测定其他量,然后结合相应的理论模型反求,属反问题研究。用简化的Mie散射理论及Kramers-Kronig关系式,利用傅里叶红外光谱仪对Al2O3粒子及煤灰粒子进行透射率实验测量,结合相应的理论模型,反演Al2O3粒子及煤灰粒子的复折射率。并对透射率实验误差对反演结果的影响进行了分析。The optical constant of particles is not equal to that of the material which makes of them. In both theory and wide practical use, it is significant that the radiation properties of a particle and assemble particles are researched with its spectral complex refractive index. The complex refractive index of a particle cannot be directly measured experimentally, since there is not direct measurement instrument. It has to be inversed through other quantity from experimental measurement and associative theoretical model. The solving process belongs to inverse problem. According to the simplified Mie scattering theory and Kramers-Kronig relation expression, the transmissivity of A1203 particles and coal ash particles were measured experimentally with a PTIR spectrometer, and combining associative theoretical model, their complex refractive indexes were inversely solved. The influence of the transmissivity measurement error on the inversed results was analyzed.

关 键 词：MIE散射理论 粒子透射率测量 复折射率 

分 类 号：TK112[动力工程及工程热物理—热能工程]