Atmospheric Aerosol Particle Detection LiDAR and Inversion Method
An atmospheric aerosol and laser detection technology, applied in particle suspension analysis, measurement devices, climate sustainability, etc., can solve problems such as increasing system structure and inverse algorithm complexity, and achieve the effect of eliminating influence and improving detection accuracy.
Active Publication Date: 2019-02-05
WUHAN INST OF PHYSICS & MATHEMATICS CHINESE ACADEMY OF SCI
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[0006] The above documents 2 and 3 effectively obtained the respective proportions of the two components of atmospheric aerosol and atmospheric molecules, which improved the detection accuracy of the content of atmospheric aerosol particles, but also increased the complexity of the system structure and inverse algorithm
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[0037] Below in conjunction with accompanying drawing, the present invention will be further described.
[0038] Such as figure 1As shown, the atmospheric aerosol particle detection lidar is composed of a transmitting laser unit 1 , a receiving telescope 2 , a receiving optical fiber 3 , a signal detection unit 4 and a signal processing unit 5 .
[0039] Such as figure 2 As shown, the composition of the signal detection unit 4 is: a collimating mirror 41, a first optical filter 43, a first focusing mirror 44 and a first photodetector 45 are coaxially installed sequentially in the output optical path of the receiving optical fiber 3; 42 is installed in the optical path between the collimating mirror 41 and the first optical filter 43, and forms an angle of 45 degrees with the optical axis, and the second optical filter 46 and the second optical filter are installed coaxially in the reflection optical path of the beam splitter 42 Focusing mirror 47 and second photodetector 48...
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The invention discloses an atmospheric aerosol particle detection lidar and an inversion method. The lidar consists of a laser transmitting unit (1), a receiving telescope (2), a receiving optical fiber (3), a signal detection unit (4) and a signal processing unit. Unit (5) consists of: using high-resolution spectral detection method to measure the Raman scattering spectrum signal generated by laser excitation of atmospheric molecules, as well as the Mi-Rayleigh scattering spectrum signal generated by excitation of atmospheric aerosol particles and atmospheric molecules, using Raman The scattering spectrum and the Rayleigh scattering spectrum are proportional to the echo intensity. The Rayleigh scattering spectrum produced by atmospheric molecules is quantitatively deducted from the Mi-Rayleigh scattering spectrum signal to obtain the signal of only atmospheric aerosol particles, which is obtained by inversion. Atmospheric aerosol particle information. Since the present invention increases the correction of low-altitude echo signals by the Raman scattering channel and eliminates the influence of Rayleigh scattering in low-altitude meter scattering, it has the advantage of improving the detection accuracy of atmospheric aerosol particles.
Description
technical field [0001] The invention relates to an atmospheric detection laser radar, in particular to an atmospheric aerosol particle detection laser radar. Background technique [0002] Atmospheric pollution components are mainly composed of aerosol particles (such as: smoke, dust, etc.) and harmful gas molecules. Among them, aerosol particles are usually measured by lidar with the mechanism of atmospheric Mie scattering, and the concentration of aerosol particles in the atmosphere can be obtained from the intensity of Mie scattering signals, as document 1 (Mie LIDAR Observations of Tropospheric Aerosolover Wuhan.Atmosphere 2015,6,1129 -1140). [0003] When the meter-scattering lidar is used to measure atmospheric aerosol particles, in the echo light, in addition to the meter-scattering echo signals containing atmospheric aerosol particles, other atmospheric molecules (such as N 2 , O 2 etc.), the Rayleigh scattering and Raman scattering light signals bring errors to th...
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IPC IPC(8): G01S17/95G01N15/06
CPCG01N15/06G01S17/95G01N15/075Y02A90/10
Inventor 林鑫李发泉李亚娟程学武杨勇刘林美陈振威宋沙磊夏媛武魁军龚顺生
Owner WUHAN INST OF PHYSICS & MATHEMATICS CHINESE ACADEMY OF SCI