Experiment study of NO2 concentration measurement with difference absorption lidar

Measurement principle of ingredient and concentration of matter with difference absorption lidar (DIAL) is introduced. The distribution of NO2 concentration within 3.5 km range is measured with the DIAL. The result shows that very accurate concentration distance distribution of NO2 can be acquired by use of two wavelength (448.2 nm and 446.8 nm) of wavelength tunable Ti:sapphire laser ．