Chernin型多通池用于气溶胶消光系数的测量研究

Measurement of Aerosol Optical Properties Using a Chernin Multipass Cell

本文将Chernin型多通池用于气溶胶消光系数的测量研究,在38.4 m吸收光程上可实现的探测灵敏度为18 Mm-1(5 s积分时间,30次平均)。结合标准气溶胶发生系统,通过对粒径为250 nm不同浓度单分散硫酸铵气溶胶消光系数的测量,得到在300、532、600 nm波长处的消光截面分别为1.410×10-9、3.727×10-10、2.948×10-10cm2,对实验结果进行误差分析表明该多通池系统可以用于气溶胶光学特性的定量研究。

Using the Chernin multipass cell for measurement of aerosol extinction coefficient is reported. Within 38.4 m absorption optical path can realize detection sensitivity to 18 Mm- 1（5 s integrating time,and 30 times average）. Combining a laboratory aerosol generation system, the extinction coefficients of 250 nm diameter monodispersed ammonium sulfate aerosol are measured under different particle concentrations. Three cross sections of 1.410 × 10-9, 3.727 × 10-10, 2.948 × 10-10 cm2 for ammonium sulfate aerosols at 300, 532, 532 nm is obtained, respectively. Error analysis carried out on the experimental results shows that this system can be used in the quantitative study of aerosol optical properties.