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

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...

AI Technical Summary

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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