Atmospheric Rice-Rayleigh scattering wind lidar and its inversion method
A wind measurement lidar and Rayleigh scattering technology, applied in the field of atmospheric detection lidar, can solve problems such as model error and calibration error
Active Publication Date: 2019-04-26
WUHAN INST OF PHYSICS & MATHEMATICS CHINESE ACADEMY OF SCI
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Problems solved by technology
In the method of using vibrational Raman to detect the scattering ratio, it is usually necessary to introduce the atmospheric molecule extinction coefficient parameter in the model atmosphere to calculate the scattering ratio, or choose the clean atmosphere in the atmosphere as a reference, and consider that the backscattering coefficient of the aerosol is approximately 0, and then calculate Scattering ratio, so it will introduce model error or error caused by calibration
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[0050] 1. Structure
[0051] Below in conjunction with accompanying drawing, the present invention will be further described.
[0052] Such as figure 1 As shown, the atmospheric meter-Rayleigh scattering wind lidar consists of a transmitting laser unit 1, two receiving telescopes 2, 3, two receiving optical fibers 4, 5, two frequency discrimination detection units 6, 7 and a signal processing unit 8 ;
[0053] Such as figure 2 As shown, the composition of the frequency discrimination detection unit 6 is: a collimating mirror 601, a first optical filter 603, a frequency discriminator 605, a first focusing mirror 606 and a first Detector 607; the first beam splitter 602 is installed in the optical path between the collimating mirror 601 and the first optical filter 603, and is at an angle of 45 degrees to the light beam, and is coaxially installed sequentially in the reflected light path of the first beam splitter 602 The second optical filter 608, the second focusing mirro...
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The invention discloses an atmospheric Mie-Rayleigh scattering wind-measurement laser radar and inversion method. The laser radar comprises a transmitting laser unit (1), two receiving telescopes (2, 3), two receiving optical fibers (4, 5), two frequency discriminating detecting units (6, 7) and a signal processing unit (8). With a high-resolution spectral detection method, a raman scattering spectral signal generated by laser at an atmospheric molecule as well as Mie-Rayleigh scattering spectral signals generated by laser at an atmospheric aerosol and an atmospheric molecule is measured; on the basis of the characteristic of a directly proportional relationship of a raman scattering spectrum to a rayleigh scattering spectrum in terms of echo intensity, an atmospheric Mie-Rayleigh scattering proportion is obtained; and a low-altitude atmospheric wind field can be obtained by inversion in an manner of noncoherent edge frequency discrimination. The structure of the laser radar is simple; and the realization difficulty is low.
Description
technical field [0001] The invention relates to an atmospheric detection laser radar, in particular to an atmospheric wind field detection laser radar. Background technique [0002] The wind field is one of the important parameters of the atmosphere. LiDAR has the advantages of high spatial resolution, high time resolution and wide spatial coverage in detecting atmospheric wind field. [0003] The atmosphere is composed of atmospheric aerosols and atmospheric molecules. Atmospheric aerosols are mainly composed of water vapor and pollutant particles, and atmospheric molecules are mainly composed of nitrogen and oxygen. [0004] In the atmosphere below a height of more than ten kilometers, the content of atmospheric aerosol is relatively high, and the volume and mass of atmospheric aerosol particles are much larger than those of molecules. scattering. At low altitudes below more than ten kilometers, the atmospheric echo light is dominated by meter scattering. Usually, the d...
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IPC IPC(8): G01S17/95G01S7/481
CPCG01S7/4816G01S17/95Y02A90/10
Inventor 李发泉林鑫程学武李亚娟夏媛杨勇宋沙磊陈振威刘林美武魁军龚顺生
Owner WUHAN INST OF PHYSICS & MATHEMATICS CHINESE ACADEMY OF SCI