Study of Retrieving Formaldehyde with Differential Optical Absorption Spectroscopy
LI Yu-jin1,2,XIE Pin-hua1*,QIN Min1,QU Xiao-ying3,HU Lin2
1. Key Laboratory of Environment Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China 2. College of Science, Laboratory for Photoelectric Technology and Application,Guizhou University, Guiyang 550025，China 3. College of Physics and Electronic Information Science, Guizhou Nationality University, Guiyang 550025, China
Abstract：The present paper introduces the method of retrieving the concentration of HCHO with differential optical absorption spectroscopy (DOAS). The authors measured ambient HCHO in Beijing region with the help of differential optical absorption spectroscopy instrument made by ourself, and discussed numerous factors in retrieving the concentration of HCHO with differential optical absorption spectroscopy (DOAS), especially, the choice of HCHO wave band, how to avoid absorption of ambient SO2,NO2 and O3,and the influence of the Xenon lamp spectrum structure on the absorption of ambient HCHO. The authors achieved the HCHO concentration by simultaneously retrieving the concentrations of HCHO，SO2,NO2 and O3 with non-linear least square fitting method, avoiding the effect of choosing narrow wave of HCHO and the residual of SO2,NO2,O3 and the Xenon lamp spectrum structure in retrieving process to attain the concentration of HCHO, Finally the authors analyzed the origin of error in retrieving the concentration of HCHO with differential optical absorption spectroscopy (DOAS), and the total error is within 13.7% in this method.
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