差分吸收光谱法测量气体浓度的光程特性数值模拟  

Numerical simulation of light path length characteristic for the measurement of gas concentration with DOAS method

作　　者：汤光华 韩少鹏 

机构地区：[1]南京国电环保科技有限公司,江苏南京210061

出　　处：《电力科技与环保》2018年第1期49-51,共3页Electric Power Technology and Environmental Protection

基　　金：国家重大科学仪器设备开发专项(2014YQ060537);江苏省科技成果转化专项资金项目(BA2016064)

摘　　要：在给定波长范围和波长间隔条件下,应用差分吸收光谱法(DOAS)对不同浓度和不同光程时的SO_2和NO_2气体混合物浓度反演进行了数值模拟。计算结果表明,随着光程的增加,浓度反演的精度不是一直随其增大,而是先增大后减小。研究进一步发现,对于同一系统,在被测气体混合物浓度变化时,其最佳光程也随之变化。The numerical simulation of light path length characteristic, which is applied to the concentration meas- urement of the gas mixture of sulfur dioxide and nitrogen dioxide at the given wavelength region and wavelength interval under different concentrations and light path length, is carried out. The calculation result is shown that the precision of retrieving concentrations doesnt always increase with the increase of light path length whereas it increases before decreasing. Furthermore, the optimum light path length varies with the concentration of being detected gas mixture for an identical system.

关 键 词：差分吸收光谱 气体浓度 光程特性 数值模拟 

分 类 号：X831[环境科学与工程—环境工程]