气溶胶颗粒折射率在光学粒径测量中的影响

摘要

Regarding the negative effect of refractive index of particles in single particle light scattering measurement,the relationship curves between the scattering radiant flux F and the particle diameter D were calculated for 13 kinds of common aerosol particles at different light-receiving central angle θ and light-receiving half-angle β,according to the Mie theory and the light radiant flux calculation formula.Thereby an evaluation standard based on the average of the measured relative errors was presented and employed to evaluate the impact of 13 kinds of refractive index on the measurement quantitatively.Through the analysis of simulation results,it is concluded that if the light radiant flux received by the light-receiving system includes the forward scattered light,the F-D curves of 13 kinds of particles are close to each other,and the impact of refractive index in the measurement is remarkablely reduced.%针对单颗粒光散射测量方法中被测颗粒折射率会影响测量结果的问题,根据Mie理论和光辐射能通量计算公式,对13种常见气溶胶颗粒,在不同采光中心角θ和采光接收半角β下的散射光辐射能通量F与粒径D关系曲线进行了计算,提出一种基于相对测量误差平均值的评价标准,依据该评价标准定量分析了13种折射率对测量的影响.通过对模拟结果的分析,得出采光结构接收到的光辐射能通量包含前向散射光的条件下,13种颗粒的F-D曲线较为接近,折射率对测量结果的影响相对较小.