光谱学与光谱分析, 2009, 29 (6): 1463, 网络出版: 2010-05-26  

1.573 μm处CO2高温谱线参数研究

Study of CO2 Spectroscopic Parameters at High Temperature near 1.57 μm
作者单位
1 中国科学院安徽光学精密机械研究所环境光谱学研究室, 安徽 合肥 230031
2 法国滨海大学大气物理与化学实验室, 法国敦刻尔克, 59140
摘要
在吸收光谱测量, 特别是高温光谱测量中, 吸收分子谱线参数的准确性非常重要, 目前普遍使用的HITRAN/HITEMP2004数据库中给出的各项参数具有一定的不确定性, 为了对所选1.573 μm处的9条可用于燃烧诊断的CO2谱线参数进行校准, 文章采用窄线宽二极管激光器作为光源, 结合自行搭建的实验室高温测量系统, 记录了300~800 K温度范围内所选谱线的高温吸收光谱, 获得了各谱线在相应温度下的谱线强度、 空气加宽系数及其温度指数等谱线参数。 通过实验结果与HITRAN/HITEMP2004数据库中数据间的对比发现两者之间吻合较好, 其中谱线强度相对偏差小于3%, 空气加宽系数及其温度指数相对偏差分别小于5%和2%。 所有各项参数对以后将要进行的燃烧诊断中的CO2浓度监测会有很大帮助。
Abstract
Measurements strategies based on absorption spectroscopy techniques, especially the measurements in high temperature, require accurate values of important spectroscopic parameters of the probed species. Sometimes the parameters listed in widely used HITRAN and HITEMP2004 database are uncertain to some extent. In order to validate the spectroscopic parameters of 9 selected CO2 lines which should be used in combustion diagnosis, spectra of those lines were recorded in a high temperature experiment setup as a function of temperature (in the range of 300-800 K) and pressure (in the range of 9-450 torr) using a distributed feed-back (DFB) diode laser. The recorded absorption spectra were fitted to Voigt profile. Line intensity, air-broadening coefficient and temperature exponent of each line were deduced from those data. Through comparison of experimental results and those listed in HITRAN and HITEMP2004 database, the discrepancies of most line intensities, air-broadening coefficients and their temperature exponents are less than 3%, 5% and 2% respectively. Those results show good consistency between the experimental data and that in HITRAN and HITEMP2004 database. The discrepancy in line intensities may be caused by the fitting of absorption spectra, the reading of thermocouple and pressure gage, uniformity of temperature in the heated cell, and uncertainty of the optical path. Those factors also cause the discrepancy in air-broadening coefficients and their temperature exponent. CO2 contained in air also introduces error in air-broadening coefficients and their temperature exponent beside those factors. Though we have deducted them in data-processing, the little change of CO2 in partial region also exists. Those results will be helpful to the measurement of CO2 concentration in combustion diagnosis in the future.

蔡廷栋, 王贵师, 陈卫东, 张为俊, 高晓明. 1.573 μm处CO2高温谱线参数研究[J]. 光谱学与光谱分析, 2009, 29(6): 1463. CAI Ting-dong, WANG Gui-shi, CHEN Wei-dong, ZHANG Wei-jun, GAO Xiao-ming. Study of CO2 Spectroscopic Parameters at High Temperature near 1.57 μm[J]. Spectroscopy and Spectral Analysis, 2009, 29(6): 1463.

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