大气气溶胶消光特性和折射率的测量
Characteristics measurement of extinction and refractive index of aerosol particles
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摘要: 介绍了一种综合利用能见度仪、微脉冲激光雷达和光学粒子计数器测量大气气溶胶折射率的新方法。首先使用能见度仪和激光雷达测量出大气气溶胶的消光系数和消光后向散射比，然后使用粒子计数器测量出粒子谱分布，结合气溶胶粒子折射率，根据球形粒子的米（Mie）散射理论，可以得到气溶胶消光系数和消光后向散射比。通过分析消光系数、消光后向散射比、粒子谱分布和折射率之间的关系，结合已知的消光系数和消光后向散射比，反演出大气气溶胶粒子的折射率。Abstract: A new method is proposed for the measurement of refractive index of aerosol by using a visibility meter(VM), an optical particle counter(OPC) and a micro pulse lidar(MPL). The extinction coefficient and ratio of extinction-to-backscatter are measured with a VM and micro pulse lidar, the number density distribution of aerosol particles is measured by an OPC with nominated radii. According to the Mie scattering theory, different distributions can be obtained with different refractive index for the same result measured by OPC. The variations of both extinction coefficient and ratio of extinction-to-backscatter can be calculated with different refractive index. The solution of refractive index can be decided according to the value of extinction coefficient and ratio of extinction-to-backscatte
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