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研究高温下待测气体的谱线属性,如谱线强度、自加宽系数、空气加宽系数、温度系数等,为高温环境中可调谐半导体激光吸收光谱技术反演温度、浓度、速度及其场分布提高精度和可靠性起着十分重要的作用.HITEMP数据库中的数据基本上是理论计算结果,与实际情况存在相当的误差.为了获得所选2.0μm处的可用于燃烧诊断的CO2谱线参数,本文采用半导体激光器作为光源,结合实验室的高温测量系统,记录了700—1300 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、自展宽系数及温度系数等谱线参数.测量得到CO2的5006.978 cm 1和5007.7874 cm 1谱线强度与理论计算值相对误差小于11%;获得了现有数据库缺少的温度系数和高温下自展宽系数数据.所有各项参数对以后将要进行的燃烧诊断中的CO2浓度检测有很大帮助.
To study spectral properties of gas under high temperature, such as spectral line intensity, self-widening coefficient, air broadening coefficient, temperature coefficient, etc., this paper studies the temperature, concentration and velocity of tunable semiconductor laser absorption spectroscopy Field distribution to improve accuracy and reliability plays a very important role.HITEMP database data is basically theoretical results, and the actual situation there is a considerable error.In order to obtain the selected 2.0μm at the CO2 spectrum can be used for diagnosis of combustion Parameters, this paper uses semiconductor laser as the light source, combined with the laboratory high temperature measurement system, records the high temperature absorption spectrum of the selected line in the temperature range of 700-1300 K, obtained the spectral line intensity of each line at the corresponding temperature, from Broadening coefficient and temperature coefficient, etc. The relative errors between theoretical and calculated spectral intensities of 5006.978 cm 1 and 5007.7874 cm 1 were less than 11%. The lack of temperature coefficient and self-stretching coefficient data in the existing database were obtained All of these parameters are very helpful for the detection of CO2 concentrations in combustion diagnostics to be performed later.