Experimental Study On Detection Of Sulfur Dioxide And Nitrogen Dioxide Pollution Gas By Lidar

Sulfur dioxide,nitrogen dioxide,and aerosols are common pollutants in the atmosphere.They not only have an important impact on climate change,but also have a direct impact on the human body.How to continuously and real-timely monitor these pollutant gases and aerosols is very important.There are many monitoring methods for these contaminated gases and aerosols,and the use of optical technology to achieve monitoring is usually the best and the least costly.Many advantages of lasers have led to a steady increase in their position in atmospheric remote sensing.In addition,with the development of more sophisticated mechanical structures and continuous development of optoelectronic technologies,many advantages of lidar have become increasingly apparent.The first two chapters of this paper are mainly for the review part.The first chapter briefly introduced the basic properties of sulfur dioxide,nitrogen dioxide,and aerosols in the atmosphere and their monitoring techniques.The second chapter systematically described the theory and technology foundation of differential absorption lidar.,which focuses on the application of differential absorption lidar in atmospheric detection.The third chapter mainly describes S02,N02 pollution gas detection lidar from three aspects:laser emitting unit,optical receiving unit,signal acquisition and control unit.Chapter four focuses on the process of differential gas absorption lidar inversion of pollution gas,and It is used to invert the actual atmospheric measurement data,and the concentration profiles of sulfur dioxide and nitrogen dioxide in the horizontal and vertical atmospheres are obtained.The inversion results are compared with the measured data of nearby weather stations.The results prove the data of the lidar in this paper effectiveness.Chapter five uses the data of the lidar in this paper to invert the atmospheric horizontal visibility and the vertical aerosol extinction characteristics.Through comparative analysis of the two wavelength inversion results,we can conclude that the lidar introduced in this paper can measure horizontal atmospheric visibility and vertical atmospheric aerosol extinction coefficient.to some extent.