随机分布多粒子侧向散射光偏振特性分析

为了研究随机分布的复合多粒子侧向散射光偏振度和粒子直径大小之间的关系,采用直径0.22μm或0.494μm的粒子与过滤的蒸馏水混合构成不同浓度的悬浮液,作为研究粒子侧向散射光偏振特性散射介质的实验方法,进行了理论分析和实验验证,取得了直径0.22μm的粒子侧向散射光强在不同深度、不同角度的偏振度和直径0.22μm或0.494μm的粒子在3种浓度中侧向散射中水平偏振度、垂直偏振度的数据。结果表明,粒子侧向散射光的退偏振对粒子直径的变化非常敏感,直径小的粒子其散射光水平方向偏振度远大于直径大的粒子,而其散射光垂直方向的偏振度却远小于直径大的粒子。这一结果对多粒子存在状况下的粒子直径检测是有帮助的(尤其适用于粒子直径小于1μm的情况)。

Analysis on the Polarization Degree of a Laser Radiation Side-scattered by the Multiple Particles Distributed Randomly

In order to study the polarization property of a laser radiation side-scattered by randomly distributed particles in different diameters,various concentrations of suspending liquid,consisting of distilled water and particles in diameters of 0.22μm or 0.494μm,was served as the scattering medium.Through theoretical analysis and experiments,the data of polarization degree in different depths and at different angles scattered by 0.22μm particles were acquired,and the data of horizontal polarization and vertical polarization scattered by 0.22μm and 0.494μm particles in three different concentrations of suspending liquid were also obtained respectively.The experiment results show that the de-polarization of radiation side-scattered by the particles is very sensitive to the variation of the diameters of the particles,i.e.,the horizontal polarization degree of the radiation scattered by the particles in smaller diameters is much higher than that scattered by the particles in larger diameters.However,it is inverse for the vertical polarization degree.The result is helpful to test the diameter of particles under the condition of multiple particles (especially for the particles ' diameter less than 1μm).