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复散射效应在光散射颗粒测量中不仅重要 ,且尚未得到很好解决。采用蒙特卡罗方法 ,对不同的光波长 ,颗粒浓度以及收接器条件下的光复散射进行了数值模拟 ,数值算法程序经与四通量模型进行对比验证 ,数值结果与单散射条件的郎伯比尔模型进行比较 ,进而讨论了复散射效应对消光法颗粒粒径测量影响。表明复散射对消光法颗粒测量的影响不仅取决于颗粒系自身的浓度 ,而且接收器的几何尺寸和接收位置起着非常重要的作用 ,减小颗粒介质层厚度和减小光接收器接收面积 ,增大接收距离以及减小接收角都能减小复散射效应对消光法粒径测量的影响。
The complex scattering effect is not only important in the measurement of light scattering particles, but has not yet been well solved. The Monte Carlo method is used to simulate the light scattering, the scattering of light at different wavelengths, the concentration of particles and the condition of the receiver. The numerical algorithm is compared with the four-flux model. The numerical results are in agreement with those of single- Bill model, and then discusses the effect of complex scattering on the particle size measurement of matting method. It is shown that the influence of complex scattering on the measurement of extinction particles depends not only on the concentration of particle system itself but also on the geometry and receiving position of the receiver. By reducing the thickness of the particle medium layer and reducing the receiving area of the light receiver, Increasing the receiving distance and decreasing the receiving angle can all reduce the influence of the complex scattering effect on the particle size measurement of the extinction method.