NO2吸收截面在410—440nm波段内的温度特性

在利用吸收光谱进行大气污染物NO2浓度检测过程中，检测结果会受到很多测量因素的影响，如温度、压力等．针对温度对NO2吸收截面的影响，提出在高温下对NO2吸收截面的温度特性进行研究．该方法采用浓度为1971．43mg／m^3的NO2标准气体，在20、40、60、80、100℃等温度点研究了高温温度与NO2吸收截面之间的定量关系，选用波长范围为吸收光谱检测NO2常用的波段410～440nm．通过对实验结果的定性和定量分析，得到不同波长处的NO2吸收截面与温度之间的定量关系式，并提出本文研究所得的定量关系可减小温度对检测结果的影响．

Effect of Temperature on the Absorption Cross-Section of NO2 in 410-440 nm Wavelength

During the measurements of the concentration of NO2 by absorption spectroscopy, the result will be affected by many factors, such as temperature, pressure and so on. To find the quantitative relationship between temperature and the absorption cross-section of NO2, the NO2 with the concentration of 1 971.43 mg/m^3 was detected at 20, 40, 60, 80,100 ℃ in the wavelength ranging from 410 to 440 nm, which is often used during the measurement of NO2 with absorption spectroscopy. Through qualitative and quantitative analyses on the experimental result, the quantitative formulas between temperature and NO2 absorption cross-section at different wavelengths were deduced. Moreover, the quantitative polynomial can be applied to decreasing the error induced by the temperature.