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.
Key words：DOAS;Relative Spectra shift;Correction of spectra
刘世胜，魏庆农，冯巍巍，詹锴，王锋平 . 城市空气质量监测系统(DOAS)谱线漂移问题及解决方法[J]. 光谱学与光谱分析, 2009, 29(06): 1450-1453.
LIU Shi-sheng, WEI Qing-nong,FENG Wei-wei, ZHAN Kai, WANG Feng-ping . A Method for Resolving Spectra Shift in the Urban Air Quality Monitoring System (DOAS). SPECTROSCOPY AND SPECTRAL ANALYSIS, 2009, 29(06): 1450-1453.
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