Research On The Control And Inversion Algorithm Of The Scanning Lidar

Aerosols have an important impact on the climate and the environment.The laser has high brightness,high collimation,monochromaticity and short pulse characteristics,which makes the lidar has high detection sensitivity and space-time resolution,and the lidar has long-term automatic continuous observation capability,and has been widely used in atmospheric detection.The Mie scattering lidar describes the concentration of aerosol in the atmosphere by obtaining the atmospheric aerosol extinction coefficient.The traditional Mie scattering lidar vertically pointed to obtain the aerosol vertical extinction coefficient profile,but the spatial sampling points are limited,limited to the air column pointing to the zenith angle.Due to the limitations of traditional Mie scattering lidar,this research has carried out research work on scanning Mie scattering lidar.In this paper,the numerical simulation of the echo signal of the Mie scattering lidar is firstly carried out,and a numerical simulation calculator is developed to provide a theoretical reference for the selection of the device of the scanning Mie scattering lidar system.Secondly,the scanning control program is written according to the scanning rack communication protocol,which improves the system automation:The design and debugging of the photomultiplier tube control circuit board were completed,and the structure and volume of the signal detection system were simplified.The reliability of the photomultiplier tube control circuit board was verified by comparison experiments:The automatic light-collecting system based on echo signals is designed and implemented.The experimental results show that the automatic alignment of the light-emitting axis can be realized automatically without the intervention of personnel.Finally,the vertical and scanning detection experiments of atmospheric aerosols were carried out by self-developed scanning Mie scatter lidar system,and the spatial and temporal distribution of aerosols on Hefei was quantitatively analyzed.The detection results show that the scanning Mie lidar has high spatial and temporal resolution compared with the traditional lidar,and can detect the atmospheric condition of the local area in a fast and wide-area real-time,and can also monitor the spatial and temporal distribution non-uniformity of the near-surface aerosol,and the orientation,level and spread of urban air pollution sources.