[A method for resolving spectra shift in the urban air quality monitoring system (DOAS)].
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.
Liu
Shi-Sheng
SS
Key Laboratory of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanic, Chinese Academy of Sciences, Hefei 230031, China. ssliu@aiofm.ac.cn
Wei
Qing-Nong
QN
Feng
Wei-Wei
WW
Zhan
Kai
K
Wang
Feng-Ping
FP