利用自行研制的气溶胶飞行时间质谱仪(aerosol time-of-flight mass spectrometer, ATOFMS)对气溶胶粒子的折射率进行测量。 首先利用ATOFMS对气溶胶粒子的粒径和光散射强度进行测量,然后由Mie散射理论结合ATOFMS光散射区域的几何结构,推算出光电倍 增管接收的理论光通量与气溶胶粒子的大小和折射率之间的函数关系。通过比较实验测量的气溶胶粒子光散射平均强度与Mie散射 理论值,对粒子的折射率进行反演。与实际样品数据参数对比的结果表明该方法是可行的。

Aerosol time-of-flight mass spectrometer (ATOFMS) is used to measure the refractive index of aerosol particles. First of all, diameter and light scattering intensity of aerosol particles are measured through the self-developed ATOFMS. Then the function relation of theoretical luminous flux accepted by photo multiplier tube (PMT) with aerosol particles size and the refractive index is deduced through the Mie scattering theory combined with the ATOFMS geometric model of light scattering experiment. The refractive index is retrieved by comparing the experimental aerosol particles average light scattering intensity with Mie scattering theory. The result shows that the method is reasonable compared with the actual sample data parameters.