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Atmospheric Raman-Rayleigh scattering temperature measurement laser radar and inversion method

A technology of Rayleigh scattering and laser radar, which is applied in the field of atmospheric detection laser radar, can solve problems such as complex system structure, achieve the effect of wide temperature measurement height range, small temperature measurement error, and expand the temperature measurement space range

Active Publication Date: 2017-03-08
WUHAN INST OF PHYSICS & MATHEMATICS CHINESE ACADEMY OF SCI
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Problems solved by technology

[0007] To sum up, at present, the detection of atmospheric temperature above and below 30km is realized by using two types of lidar, and the detection of Raman scattering uses two detection channels, and the system structure is relatively complicated.

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  • Atmospheric Raman-Rayleigh scattering temperature measurement laser radar and inversion method
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  • Atmospheric Raman-Rayleigh scattering temperature measurement laser radar and inversion method

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Embodiment Construction

[0045] Below in conjunction with accompanying drawing, the present invention will be further described.

[0046] Depend on figure 1 It can be seen that the atmospheric Raman-Rayleigh scattering temperature measurement 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 .

[0047] Depend on figure 2 It can be seen that the composition of the signal detection unit 4 is: in the output optical path of the receiving optical fiber 3, a collimating mirror 41, a first optical filter 43, a first focusing mirror 44 and a first photodetector 45 are coaxially installed sequentially; Installed in the optical path between the collimating mirror 41 and the first optical filter 43, and form an angle of 45 degrees with the optical axis, the second optical filter 46, the second focusing Mirror 47 and the second photodetector 48; The first photodetector 45 and the second photodetect...

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Abstract

The invention discloses an atmospheric Raman-Rayleigh scattering temperature measurement laser radar and an inversion method. The laser radar comprises a laser transmitting unit (1), a receiving telescope (2), a receiving optical fiber (3), a signal detecting unit (4) and a signal processing unit (5). A high-resolution spectrum detection method is adopted to measure Rayleigh scattering spectral signals generated on atmospheric molecules by laser higher than 30km or above and Raman scattering spectral signals generated on atmospheric molecules by laser lower than 30km; and inversion is carried out to obtain the temperature of atmosphere at 30km, or above or below can be obtained based on a characteristic that the Raman scattering spectrum is in direct proportion to the Rayleigh scattering spectrum in echo intensity, and therefore, the temperature measurement space range of the Rayleigh scattering temperature measurement laser radar can be expanded. The atmospheric Raman-Rayleigh scattering temperature measurement laser radar has the advantages of wide temperature measurement height range and small temperature measurement error.

Description

technical field [0001] The invention relates to an atmospheric detection laser radar, in particular to an atmospheric Raman-Rayleigh scattering temperature measurement laser radar. Background technique [0002] Atmospheric temperature is one of the important parameters of the atmosphere. In the altitude range from above 30km to 80km in the atmosphere, the composition of the atmosphere is mainly neutral nitrogen and oxygen molecules, which is a blind area for radio wave detection. The temperature of this layer is mainly detected by laser radar technology. The mechanism of lidar detection of this layer is: use laser light to irradiate atmospheric molecules to generate Rayleigh scattering, obtain the atmospheric density by detecting the echo intensity of Rayleigh scattering, and then use the ideal gas state equation per unit volume P=NRT to calculate the temperature, Among them, P is the atmospheric pressure, which can be obtained by the atmospheric pressure model; N is the ga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/95
CPCG01S17/95Y02A90/10
Inventor 李发泉林鑫李亚娟程学武宋沙磊陈振威杨勇刘林美夏媛武魁军龚顺生
Owner WUHAN INST OF PHYSICS & MATHEMATICS CHINESE ACADEMY OF SCI
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