| 光谱学与光谱分析 |
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| A Method for Resolving Spectra Shift in the Urban Air Quality Monitoring System (DOAS) |
| LIU Shi-sheng, WEI Qing-nong,FENG Wei-wei, ZHAN Kai, WANG Feng-ping |
| Key Laboratory of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanic, Chinese Academy of Sciences, Hefei 230031, China |
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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.
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Received: 2008-03-02
Accepted: 2008-06-03
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Corresponding Authors:
LIU Shi-sheng
E-mail: ssliu@aiofm.ac.cn;shshliu@163.com
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