差分吸收光谱法在线测量SO2气体浓度的温度补偿研究
首发时间:2007-12-29
摘要:差分吸收光谱法(DOAS)应用于固定污染源烟气排放监测时,烟气温度对SO2的紫外可见吸收特性影响较大,其差分吸收度随温度升高峰值减小,谷值增大,因此必须对温度的影响进行修正。本文提出了一种新的温度补偿方法,将室温下的分子数密度与不同温度下的分子数密度之比与温度的对应关系拟合出温度补偿函数,利用此补偿函数分别对差分吸收截面、吸收度以及浓度反演结果进行补偿的结果表明,不论采用哪一种补偿方法都可以获得满意的浓度反演精度。
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Study of temperature compensation to the concentration of SO2 in in-situ measurement with DOAS method
Abstract:The effect of temperature on SO2 absorption characteristics is obvious in UV-Visible band when the differential optical absorption spectroscopy(DOAS) technique is applied to monitor the flue gas from fixed pollution source. The general effect of increasing temperature on the studied spectral features was a smoothing of the differential absorption structure with a continuous lowering of absorption peaks and raising of valleys. So we should be to take the temperature effect into account. In this paper, we compensated for the temperature dependence with another new method. It was that using the changing relation with temperature of the ratio of molecules number density fitted temperature compensation function. The results using it for revising the differential absorption cross-sections and differential absorbance and retrieval concentration showed that it would be given satisfactory concentration retrieval precision by utilizing any revising method.
Keywords: DOAS, absorption cross-section, temperature effect, temperature compensation
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No.1756018014111988****
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