Method and device for obtaining extinction coefficients of aerosol

A technology of extinction coefficient and aerosol, which is applied in the direction of measuring devices, climate sustainability, particle and sedimentation analysis, etc., and can solve problems with large limitations and difficulty in achieving high precision

Active Publication Date: 2019-07-12
北京是卓科技有限公司
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Problems solved by technology

[0007] 1) The slope method assumes that the atmosphere is a uniform atmosphere as a condition, but this kind of weather is difficult to occur in actual situations, so this method is difficult to achieve high accuracy, and can only be used in the horizontal direction
[0008] 2) The Klett method only considers a single component, that is, it can only be used when the aerosol concentration is large, and it is assumed that the relationship between the reflection and extinction coefficients satisfi

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  • Method and device for obtaining extinction coefficients of aerosol
  • Method and device for obtaining extinction coefficients of aerosol
  • Method and device for obtaining extinction coefficients of aerosol

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Embodiment Construction

[0035] In order to make the technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0036] When the laser propagates in the atmosphere, it will be scattered when encountering atmospheric molecules, aerosol particles, clouds and precipitation. The lidar equation is an equation that quantitatively describes the laser propagation process in the atmosphere, and the lidar echo signal contains the optical information of atmospheric aerosols. This information needs to be obtained by inverting the echo signal in the lidar data after the lidar data is obtained.

[0037] The invention proposes a method for obtaining the aerosol extinction coefficient, so that the aerosol extinction coefficient can be accurately calculated.

[0038] figure 1 It is a flowchart of a method for obtaining an aerosol extinction coefficient in an embodiment of...

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Abstract

The invention provides a method and device for obtaining extinction coefficients of aerosol. The method includes the steps that a laser pulse is emitted into the atmosphere through a lidar, and the power of backscattered light after the laser pulse is scattered by the atmosphere is obtained after receiving and measuring; atmospheric correction parameters at one or more preset positions are obtained through an atmospheric integrating nephelometer; a relational expression between the extinction coefficients of the aerosol and backscattering coefficients is obtained according to the atmospheric correction parameters; and the power of the backscattered light and the relational expression between the extinction coefficients of the aerosol and the backscattering coefficients are substituted intoa lidar equation, and the extinction coefficients of the aerosol at the preset positions are calculated. According to the method and device for obtaining the extinction coefficients of the aerosol, the extinction coefficients of the aerosol can be calculated accurately.

Description

technical field [0001] The present application relates to the technical field of lidar, and in particular to a method and device for obtaining an aerosol extinction coefficient. Background technique [0002] With the aggravation of industrial pollution, smog weather occurs frequently, and air pollution has seriously affected human health. Therefore, the detection of air quality has become particularly important, and the monitoring, analysis and research of particulate matter in the air has become the focus of current environmental protection work. [0003] According to the aerodynamic diameter, atmospheric particulate matter can be divided into: (1) total suspended particulate matter (TSP for short) with a diameter of less than 100 microns; (2) inhalable particulate matter with a diameter of less than 10 microns; fine particles. Among them, fine particulate matter PM2.5 can be suspended in the atmosphere for a long time, which has an important impact on air quality and vis...

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Application Information

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IPC IPC(8): G01N21/47G01S17/95G01N15/06G01N15/02
CPCG01N21/47G01S17/95G01N15/06G01N15/02G01N15/0211G01N2015/0693Y02A90/10
Inventor 张景秀侯珑斐张志伟
Owner 北京是卓科技有限公司
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