Atmospheric aerosol optical property measuring method and laser radar system

Abstract

The invention discloses an atmospheric aerosol optical property measuring method and a laser radar system which is high in spectral resolution. By locking the laser emission frequency, the function of the laser radar system which is high in spectral resolution is achieved. According to a Fabry-Perot interference narrowband spectral filter, an aerosol scattering component and a molecular scattering component are separated, the difficulty that in a traditional back scattering laser radar, one radar equation is utilized to invert two unknown quantities, namely a aerosol scattering coefficient and an extinction coefficient is appropriately solved, limitation of the emission laser wavelength do not exist, the measured atmosphere back scattering ratio is high in accuracy, and the relative error is small.

Description

technical field [0001] The invention relates to a method for measuring the optical characteristics of atmospheric aerosols and a high-spectral resolution laser radar system, in particular to a high-resolution laser radar system based on a Fabry-Perot interferometer that ensures the coincidence of the interferometer spectrum and the laser spectrum by locking the laser frequency. Spectral Resolution LiDAR Systems. Background technique [0002] Atmospheric aerosols refer to solid and liquid particles suspended in the atmosphere with a diameter between 0.001-100 μm, which directly affect the radiation balance of the earth through absorption and scattering, and at the same time change the formation and characteristics of clouds, thereby indirectly affecting radiation transmission. The measurement of aerosol optical properties is very important for atmospheric research and flux transport research. In addition, the aerosols formed by air pollution often contain many harmful su...

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Problems solved by technology

[0008] Existing methods for extracting atmospheric aerosol parameters from meter-scattering lidar, such as the Klett method, need to make assumptions about the ratio of lidar, which affects the detection accuracy of the aerosol extinction coefficient

The HSRL (High Spectral Resolution Lidar) based on the iodine molecular filter uses the high suppression ratio characteristics of the iodine molecular filter on the aerosol backscattering to separate the aerosol and molecular scattering, thus obtaining high-precision atmospheric aerosol and Molecular optical parameter profile, but the absorption peak of the iodine molecular absorption filter does not exist at many commonly used laser frequencies, which limits its use; HSRL based on the Fizeau interference filter separates aerosol scattering and atmospheric molecular scattering, and solves solves a morbid mathematical problem in measuring the optical properties of aerosols by lidar, and does not need to assume the ratio of lidar, but its light energy collection efficiency is low

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