摘要
采用米氏散射理论,提出一种在传统前向散射布局基础上,增加大角度探测器的实验装置,并对散射光作偏振探测,从而实现对微米直径范围的球粒进行直径分布测量的方法。数值模拟发现散射光强的垂直偏振分量与假设的目标散射光强的垂直偏振分量之间的根均方差为最小。采用Phillips-Twomey算法,设定罗辛-罗姆勒(RR)分布,通过拟合散射光强的垂直偏振分量的角分布曲线获得罗辛-罗姆勒分布中的直径参数和直径分布宽度参数。该方法在理论上快速准确。所提方案在实验上也切实可行。
Based upon a full Mie＇s theory on fight scattering by small spherical substances, we put forth a modified version for sizing micrometer scale particles by detecting polarized scattered laser beam over a large angular range by adding side sensors to the conventional forward detection. Our extensive numerical simulation showed that the suggested method is quick in data processing and accurate in particle parameter retrieving, plus its feasibility in experimental implementation.
出处
《现代科学仪器》
2005年第6期55-57,共3页
Modern Scientific Instruments
基金
2004年天津市科委基金项目043601011
