title: [A method for resolving spectra shift in the urban air quality monitoring system (DOAS)].
abstract: In the urban air quality monitoring system, there is spectra shift which is caused by environment factors on the optical part (temperature and optic fiber position), or by the self-change of Xe-lamp. Relative spectra shift will occur if the shift of lamp-spectrum and air-spectrum is inconsistent which has direct influences on the accuracy of the measurement results. So the match of wavelength between lamp-spectrum and air-spectrum should be considered when we retrieve pollutants concentration measurement of trace gas in the atmosphere through DOAS method. Based on the study of the unique structures for Xe-lamp emitting spectrum, a method for the calibration of two signal spectra using Xe-lamp emitting peak and least square fitting is given. The results show that, the impact of spectrum shift can be reduced by this method for retrieving results.
authors.affiliation: Key Laboratory of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanic, Chinese Academy of Sciences, Hefei 230031, China. ssliu@aiofm.ac.cn
authors.forename: Shi-Sheng
authors.initials: SS
authors.lastname: Liu
authors.forename: Qing-Nong
authors.initials: QN
authors.lastname: Wei
authors.forename: Wei-Wei
authors.initials: WW
authors.lastname: Feng
authors.forename: Kai
authors.initials: K
authors.lastname: Zhan
authors.forename: Feng-Ping
authors.initials: FP
authors.lastname: Wang