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差分吸收光谱反演方法在环境监测系统中的研究
引用本文:张学典,黄显,徐可欣.差分吸收光谱反演方法在环境监测系统中的研究[J].光谱学与光谱分析,2007,27(11):2367-2370.
作者姓名:张学典  黄显  徐可欣
作者单位:天津大学精密测试技术及仪器国家重点实验室,天津,300072
基金项目:天津市自然科学基金 , 中国地质调查局科研项目
摘    要:差分吸收光谱(DOAS)技术在大气/烟气污染物排放环境监测中有广泛的应用.文章首先对这种方法进行了介绍和分析,通过公式推导出被测量气体的差分吸收光谱和参考差分吸收截面光谱所包含的面积具有线性关系,并由此给出了一种新的气体浓度计算方法,即直接用差分吸收面积拟合法代替最小二乘方法,从而避免了光谱不同分辨率、光谱漂移、拉伸或压缩等因素对测量结果造成的误差,同时这种方法具有计算量小和处理速度快等特点.最后,在自行研制的烟气DOAS测量系统上测量了四种浓度的SO2标准气体,实验结果验证了该方法在实验室条件下的有效性.

关 键 词:差分吸收光谱(DOAS)  环境监测保护  吸收截面
文章编号:1000-0593(2007)11-2367-04
收稿时间:2006-11-19
修稿时间:2007-03-03

Novel Analysis Algorithms for Differential Optical Absorption Spectroscopy for Pollution Monitoring
ZHANG Xue-dian,HUANG Xian,XU Ke-xin.Novel Analysis Algorithms for Differential Optical Absorption Spectroscopy for Pollution Monitoring[J].Spectroscopy and Spectral Analysis,2007,27(11):2367-2370.
Authors:ZHANG Xue-dian  HUANG Xian  XU Ke-xin
Institution:State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China.
Abstract:Differential optical absorption spectroscopy, or DOAS, is a widely used method to determine concentrations of atmospheric species. The principle of DOAS for measuring the concentration of air pollutants is presented in briefly. Using the linear relationship between the area of the measured differential absorbance curve and that of the differential absorption cross-section curve as taken from the literature, an alternative method for calculating the gas concentration on the basis of the proportionality between differential absorbance and differential absorption cross section of the gas under study was developed. The method can be used on its own for single-component analysis or as a complement to the standard technique in multi-component cases. The procedure can be used with differential absorption cross sections measured in the laboratory or taken from the literature. In addition, the method provides a criterion to discriminate between different species having absorption features in the same wavelength range.
Keywords:DOAS  Environmental monitoring  Absorbance cross section
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