基于可调谐半导体激光吸收光谱的H2O分子光谱参数测量研究

屈东胜; 洪延姬; 朱晓辉

doi:doi:10.3964/j.issn.1000-0593(2021)04-1072-07

光谱学与光谱分析, 2021, 41 (4): 1072, 网络出版: 2021-04-12

基于可调谐半导体激光吸收光谱的H2O分子光谱参数测量研究

Measurements of H2O Spectroscopic Parameters Based on the Tunable Diode Laser Absorption Spectroscopy

论文大纲

屈东胜 ^*洪延姬朱晓辉

作者单位

航天工程大学激光推进及其应用国家重点实验室, 北京 101416

光谱参数光谱数据库线强度时分复用 Spectroscopic parameters Spectral database Line strength Time division multiplexing

摘要

气体分子吸收谱线的光谱参数是影响吸收光谱测量精度的重要因素, 分子光谱数据库中收录的光谱参数大都具有较大的不确定度, 用以测量气体温度等参数时会产生较大的测量误差。为了获得可用于燃烧场诊断的H2O谱线的光谱参数, 采用时分复用技术, 在温度、压强和H2O组分浓度可控的环境中对1.4 μm附近的吸收光谱开展了研究。对7 185.60和7 454.45 cm-1两条H2O谱线的线强度、展宽系数及其温度指数等光谱参数进行测量, 实验结果表明, 两条谱线的线强度测量值与数据库中的值偏差分别小于2.61%和4.65%, 不确定度都小于4%。

Abstract

The spectroscopic parameters of gas absorption lines are an important factor that can influence gas parameters’ measurement accuracy based on laser absorption spectroscopy technology. However, the spectroscopic parameters in the molecule spectral database exist big uncertainties, resulting in the obvious measurement errors when used in laser absorption technology measurement. To obtain the spectroscopic parameters of H2O lines that can be used in the combustion diagnosis, time-division multiplexing technique is adopted to measure the absorption spectroscopy near 1.4 μm in the environments where the temperature, pressure and H2O concentration are known. The line strength, broadening coefficients and their temperature-dependent exponents of two H2O lines (7 185.60 and 7 454.45 cm-1) are measured, and the measured line strength of the two lines is less than 2.61% and 4.65% compared to the value in the HITRAN database. The uncertainty of the measured line strength of two lines is less than 4%.

参考文献

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屈东胜, 洪延姬, 朱晓辉. 基于可调谐半导体激光吸收光谱的H2O分子光谱参数测量研究[J]. 光谱学与光谱分析, 2021, 41(4): 1072. QU Dong-sheng, HONG Yan-ji, ZHU Xiao-hui. Measurements of H2O Spectroscopic Parameters Based on the Tunable Diode Laser Absorption Spectroscopy[J]. Spectroscopy and Spectral Analysis, 2021, 41(4): 1072.

基于可调谐半导体激光吸收光谱的H2O分子光谱参数测量研究

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