Research On Two-dimensional Distribution Of Gas Pollutants Based On Imaging Spectroscopy

With a rapidly expanding economy in rencent years,the degree of industrialization has become higher.The issue of atmospheric environmental pollution is aggravating,and seriously affects people's health.Accurate information of the distribution and change of pollutants in the pollution sources and atmospheric boundary layer will help us explain and predict the transportation and diffusion processes of atmospheric pollutants,and provide scientific data support for improving the monitoring and forecasting capabilities of the atmospheric environment.Based on Imaging Differential Optical Absorption Spectroscopy,this paper focuses on the two-dimensional distribution reconstruction method of gas pollutants,and obtains the two-dimensional distribution information of gas pollutants that exist in chemical industry parks and urban atmosphernc boundary layers.1.Aiming at the requirement of high-precision detection of two-dimensional distribution of gas pollutants in atmosphere,this thesis firstly studies the inversion method of gas pollutants in atmosphere based on I-DOAS.Designed and developed an automatic processing software of imaging spectrum binning and extraction,data inversion,and spectral space matching.After that,an I-DOAS system is integrated,and the performance test,as well as sample gases test of this system is carried out.The relative measurement error of NO₂ and SO₂ column concentration is within 5%.2.The two-dimensional reconstruction method of gas pollutants concentration distribution is carried out,which focuses on reconstruction algornthm and the optimization of several interpolation algorithms applied to data retrieval.And simulation studies show that the Kriging interpolation method is more suitable for the two-dimensional distribution reconstruction of gas pollutants.3.Based on the interpolation and reconstruction algorithm research,the integrated I-DOAS system is used to measure high spatial resolution distribution of gas pollutants in the pollution sources and atmospheric boundary layer.The spatial resolution of a single pixel at 1km is 17.45m*0.90m?hornzontal*vertical?.The time resolution is within 10 min.The two-dimensional distribution reconstruction method of gas pollutants and the integrated I-DOAS system studied in this paper can accurately obtain the two-dimensional distribution information of gas pollutants,which exit in the pollution sources and atmospheric boundary layer.This I-DOAS system can provide an important technical support for the transportation of gas pollutants,atmospheric boundary layer chemical actions of gases and pollution prevention.