差分吸收光谱技术监测大气气溶胶粒谱分布

Determination of size distribution of atmospheric aerosol by DOAS

介绍了利用双光路差分吸收光谱(DOAS)技术监测大气气溶胶并反演其粒谱分布的新方法.该方法解决了DOAS技术中光源绝对光强难以测量的难题,去除了由于光源自身波动造成的影响,在250—650nm范围内成功的反演出气溶胶的消光系数以及0·1—1·75μm谱段的粒谱分布.通过与光学粒子计数器的对比实验证实该方法的可行性.

With the method of differential optical absorption spectroscopy （DOAS）, aerosol along the light path is monitored and its size distribution is measured with double optical path method. By using double optical path method, the absolute intensity of the source can be determined and the influence of source variation is reduced greatly. Aerosol extinction coefficient from 250nm to 650nm and size distribution from 0.1μm to 1.75μm were obtained. By comparison with optical particle counting, good correlations are found between the DOAS and optical particle counting resulcs.