Proceedings Article | 17 May 2019
KEYWORDS: Atmospheric particles, Aerosols, LIDAR, Molecules, Atmospheric optics, Atmospheric monitoring, Clouds, Laser scattering, Mie scattering, Nitrogen
The new-type all-weather Raman-Mie scattering lidar system applied to atmospheric aerosol pollution monitoring was introduced, and it was mainly used for automatic continuous monitoring of atmospheric boundary layer structure, tropospheric aerosol and cloud optimal characteristics, morphologies and water vapor mixture ratio. In the aspect of overall structure, this system utilizes mature Mie scattering, polarization and Raman lidar technologies as well as integrated design with compact structure and convenient transportation, and it doesn’t need installation and debugging in the out-field test. The system emits three wavelengths 355nm, 532nm and 1,064nm, single-pulse energies are 50mj, 90mj and 250mj respectively, repetition frequency is 20Hz, Cassegrain telescope with 400mm caliber is used as the receiving system and subsequent optical and sounding units consist of six sounding channels, where Raman sounding channel is used to measure 386nm Rama scattering signal generated due to reaction of 355nm emergent laser with nitrogen molecules in the atmosphere and 407nm Raman scattering signal generated due to the reaction with vapor molecules in the atmosphere. Vertical sounding channel is used to measure vertical component of Mie scattering signal generated due to the reaction of 532nm emergent laser with particles in the atmosphere and horizontal sounding channel is used to measure horizontal component of Mie scattering signal generated due to 532nm emergent laser with particles in the atmosphere. Measured data of six sounding channels used and the abovementioned inversion method combined, optical parameters of tropospheric aerosol and cloud and vertical distribution features of water vapor mixture ratio can be obtained. This lidar product was transported to Chongqing in February, 2018 for out-field test which lasted 4 months, the equipment was under normal operation in this period and remained unattended, measured data were automatically transmitted to users through network and data transmission functions, and measured results could be automatically processed and displayed in a real-time way, thus realizing product application requirements of lidar, and then it could be extensively applied to research fields like atmospheric environmental monitoring and atmospheric sciences.
