夫琅禾费线对差分光学吸收光谱法测量大气污染气体影响的研究

A study on the effect of Fraunhofer structure on the measurement of atmospheric pollutants with differential optical absorption spectroscopy

使用差分光学吸收光谱仪进行大气环境测量,白天强烈的太阳散射光会叠加到测量光谱中,其中的夫琅禾费结构会对二氧化氮,甲醛,亚硝酸等的测量带来较大的影响.通过分析夫琅禾费结构,并且将其作为一种大气“成分”,数据反演时与其他大气成分一同拟合可以有效地影响降低其影响.

During the measurment of atmospheric environment with differential optical absorption spectroscopy, stray light of the sun will be added to the measurment spectrum and the Fraunhofer structure in the solar radiation could affect the measurement of NO2, CH2O, HONO etc. But if it is treated as a kind of ‘component’of atmosphere and retrieved with other atmospheric components together, its effect on the measurement could be restricted to a minimum.