Laser radar system for measuring Raman spectra of atmospheric water and fluorescence spectra of aerosols

Abstract

The invention discloses a laser radar system for measuring Raman spectra of atmospheric water and fluorescence spectra of aerosols.The system consists of a transmitting unit, an optical receiving and signal detection unit and a control unit.The transmitting unit adopts a seed injected solid laser to output ultraviolet laser with the narrow linewidth of 354.8 nm and guide the ultraviolet laser to the zenith.The optical receiving and signal detection unit collects backward scattering light from atmospheric substances, produces inhabitation superior to 15 orders of magnitude to nearby light of 354.8 nm and distinguishes and records signal light in the spectrum band range of 393.0-424.0 nm at the spectral precision of 0.8 nm.The control unit guarantees the orderly work of the whole radar system.Under the radiation of ultraviolet laser with the wave length of 354.8 nm, the vibrational-rotational Raman spectrum regions of gas-state, liquid-state and solid-state water sequentially correspond to the ranges of 395-409 nm, 396-410 nm and 401-418 nm.The laser radar system can simultaneously record the Raman spectra produced by the three states of water and fluorescence spectra of produced by aerosol particles and achieve simultaneous detection of the atmospheric water, aerosols and other substances.

Description

technical field [0001] The invention relates to a laser radar system capable of simultaneously measuring the Raman spectrum produced by three-phase water in the atmosphere and the fluorescence spectrum produced by aerosol particles. Background technique [0002] Water is an important substance in the atmosphere. The existence and change of water vapor and clouds composed of liquid / solid water in the atmosphere will directly affect the atmospheric radiation budget. Accurately grasping the content, distribution and phase state of atmospheric water is very necessary in the field of atmospheric research. Achieving high-precision detection of atmospheric water requires great technical efforts; water Raman lidar uses the vibration-rotational Raman spectrum of water to measure atmospheric water, which has the advantage of high temporal and spatial resolution. The water vapor Raman lidar mainly obtains the water vapor profile by receiving the Q-branch signal of the water vapor vib...

AI Technical Summary

Problems solved by technology

It is difficult to directly identify the presence of aerosol fluorescence in the lidar system that uses a limited bandwidth filter device to extract water Raman signals, and cannot eliminate the interference of aerosol fluorescence in the presence of aerosol fluorescence

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