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研究了基于红外差分光学吸收光谱技术的环境大气中的水汽测量方法.所用实验装置由自制的非分散红外多组分气体分析仪改装而成,根据HITRAN数据库提供的线强参数,采用Voigt展宽线型和方法,并考虑温度、气压及仪器函数的影响,计算出了水汽反演波段的有效吸收截面.将反演的水汽浓度与非分散红外分析仪的测量结果进行了实时对比,得到了较好的测量一致性,测量相关系数为0.93347.为今后采用红外DOAS技术测量其他在紫外可见波段无吸收或仅有弱吸收的气体(如CO_2,CH_4,CO,N_2O等)提供了可借鉴的解决方案.
The method of water vapor measurement in ambient atmosphere based on infrared differential optical absorption spectroscopy was studied.The experimental device was modified by self-made non-dispersive infrared multi-component gas analyzer.According to the parameters of line strength provided by HITRAN database, Voigt broadening line Type and method, and taking into account the influence of temperature, pressure and instrument function, the effective absorption cross-section of the water vapor inversion band was calculated.Compared with the measurement results of non-dispersive infrared analyzer, Good measurement consistency with a correlation coefficient of 0.93347. It provides a reference for the future measurement of other gases with no or only weak absorption in the ultraviolet visible band (such as CO_2, CH_4, CO, N_2O, etc.) by infrared DOAS Program.