基于腔衰荡光谱技术的大气甲烷浓度测量  

作　　者：焦建瑛 张涛 王嵩梅 何少平[1] 

机构地区：[1]北京市燃气集团有限责任公司,北京100035

出　　处：《科技创新与应用》2020年第11期141-142,145,共3页Technology Innovation and Application

摘　　要：文章基于腔衰荡光谱技术,利用甲烷光谱吸收峰R(3),对大气中的甲烷浓度进行了测量。结果表明,尽管在测量波长附近,H2O的吸收截面远小于CH4,但仍对甲烷浓度测量仍具有一定影响。实验测得环境大气中甲烷浓度约为2ppm,略高于大气甲烷浓度的平均值。We completed the concentration detection for atmospheric methane at 1653.7nm,corresponding to the R(3)line,based on cavity ring-down spectroscopy(CRDS).This work demonstrates the humidity had an effect on the validity of the methane concentration in the air,despite the very small absorption cross section of H2O compared to the one of the strong line of CH4.The atmospheric methane concentration was measured to be 2 ppm,which was offset by gaining the moisture concentration in the weak absorption line near 1653.5 nm.

关 键 词：腔衰荡光谱技术 甲烷 水汽 

分 类 号：X831[环境科学与工程—环境工程]