Inversion method of extinction coefficient of aerosol based on Raman-Mie scattering laser radar

A technology of extinction coefficient and laser radar, which is applied in the directions of Raman scattering, scattering characteristic measurement, material excitation analysis, etc., can solve the problems of detection distance limitation, error and uncertainty, low signal-to-noise ratio, etc. Short, realize high-precision detection, and improve the effect of inversion accuracy

Active Publication Date: 2019-04-09
江苏光在科技有限公司
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However, for the relatively clean middle and upper troposphere, the echo signal of Raman scattering lidar is weak (low signal-to-noise ratio), and the signal is doped with a lot of noise. When inverting the extinction coefficient, it is easy to introduce serious errors and inaccuracies. deterministic and makes its detection range limited

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  • Inversion method of extinction coefficient of aerosol based on Raman-Mie scattering laser radar
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  • Inversion method of extinction coefficient of aerosol based on Raman-Mie scattering laser radar

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[0023] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer and clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0024] In the claims, description and above-mentioned drawings of the present invention, unless otherwise clearly defined, the terms "first", "second" or "third" are used to distinguish different objects, not for Describe a specific order.

[0025] In the claims, specification and above-mentioned drawings of the present invention, if the terms "comprising", "having" and their variants are used, it is intended to mean "including but not limited to".

[0026] Such as figure 1 As shown, the aerosol extinction coefficient inversion method based on Raman-m...

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Abstract

The invention provides an inversion method for an extinction coefficient of an aerosol based on a Raman-Mie scattering laser radar, comprising the steps of: Step 1: obtaining an echo signal of a Ramanchannel in the Raman-Mie scattering laser radar, and determining an lidar ratio of the aerosol by Ansmann method, that is, obtaining the extinction coefficient and a backscattering coefficient of theaerosol by using Raman method; Step 2: obtaining an echo signal of a Mie channel in the Raman-Mie scattering laser radar, and inverting a distribution profile of the extinction coefficient of the aerosol based on Fernald method; and Step 3: correcting, based on an inversion result of the Raman method in step 1, key parameters required to invert the distribution profile of the extinction coefficient by using the Mie scattering method in step 2, that is, a boundary value of the extinction coefficient of the aerosol, thereby improving the inversion precision of the distribution profile of the extinction coefficient of the Mie scattering channel. According to the inversion method for the extinction coefficient of the aerosol based on the Raman-Mie scattering laser radar provided by the invention, high-precision detection of aerosols is achieved by combining the characteristics of Raman scattering and Mie scattering.

Description

technical field [0001] The invention belongs to the technical field of aerosol measurement, and in particular relates to an aerosol extinction coefficient inversion method based on Raman-meter scattering lidar. Background technique [0002] Atmospheric aerosol usually refers to a stable mixed system composed of solid and liquid particles dispersed in the atmosphere, including smoke, fog, haze, dust, sand, etc. Aerosols are dispersed in the atmosphere and directly or indirectly affect many physical and chemical changes in the atmospheric environment. Aerosols directly affect the reflection and absorption of solar radiation by the atmosphere, and then affect the planetary albedo and climate system. The indirect effects are that aerosols participate in the chemical process of the atmosphere and act as cloud condensation nuclei, changing the composition of the atmosphere. At the same time, aerosols, which act as cloud condensation nuclei, will also affect the lifespan of clouds...

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65G01N21/47
CPCG01N21/47G01N21/65
Inventor 常建华李红旭张露瑶毛仁祥张树益
Owner 江苏光在科技有限公司
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