应用于FTIR气体监测的HITRAN数据库分子标准吸收截面计算方法研究

Algorithm of Molecular Standard Absorption Cross-Section in HITRAN Database for Atmospheric Monitoring by FTIR Spectrometry

根据HITRAN数据库中分子吸收谱线的积分线强和一些谱线相关参数(中心位置、压力展宽半宽度、温度依赖系数等),研究了应用于FTIR气体监测的HITRAN数据库分子标准吸收截面计算方法.主要包括线强温度修正.谱线展宽,谱线卷积。逐线积分和数值算法。以甲烷为例给出采用矩形(Boxcar)和三角(Triangular)两种截断函数得到的1cm^(-1)分辨率下甲烷分子标准吸收截面数据。

The algorithm of molecular standard absorption cross-section in HITRAN database for atmospheric monitoring by FTIR spectrometry was studied according to integrated line strength of molecular adsorption spectra in HITRAN database and those parameters,such as central position,half width of pressure broadened bandwidth and temperature dependent coefficient.Temperature correction of integrated line strength,spectra broadening,spectra convolution,line-by-line integration and numeric algorithm were discussed in detail.Finally,spectra of standard absorption cross-section of methane at two different apodization functions（Boxcar and Triangular） were calculated with this algorithm,which obtained datas of standard absorption cross-section of methane at resolution ratio of 1cm^（-1）.