CO的第二泛频(3←0)跃迁谱线线形强度测量研究

Investigation on the Line Intensity Measurement of the Second Overtone(3←0)Band of CO

CO分子是监测大气污染气体的优异示踪气体,要实现对CO分子实时监控就需要做到对气体浓度的精确快速测量。气体分子浓度测量可以利用测量吸收光谱和谱线线形强度得到,CO的(3←0)泛频谱带是吸收较弱的跃迁波段,利用以干空气为缓冲气体的200μmol/mol的CO混合物,基于稳频的光腔衰荡装置测量了在温度293 K、压力13~93 kPa下的CO分子R支3条跃迁谱线的吸收光谱。HTP(Hartmann-Tran profile)线形被用来获得这些谱线的线形强度,测量结果的相对标准不确定度优于1%,与国际HITRAN、HITEMP和GEISA光谱数据库比较,相对偏差小于4%。

CO molecule is an excellent tracer gas for monitoring air pollution.Accurate and fast measurement of gas concentration is required for real-time monitoring of CO molecule.Gas molecule concentration measurements can be obtained by measuring the absorption spectra and the linear intensity of the spectrum.The CO(3←0)universal spectrum band is a transition band with weak absorption.The absorption spectra of three R branch transition spectra of CO molecule are measured at a temperature of 293 K and pressures of 13~93 kPa by using a frequency-stable optical cavity ring-down device with 200μmol/mol CO mixture using dry air as buffer gas,and HTP(Hartmann-Tran profile)lines are used to obtain the linear intensity of these lines.The relative standard uncertainty for line intensity measurement is less than 1%,and compared with the international HITRAN,HITEMP and GEISA spectral databases,the relative deviation is less than 4%.