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Method for measuring geometrical factors of backscattering laser radar

A technology of lateral laser radar and laser radar, which is applied in the measurement of scattering characteristics and other directions

Inactive Publication Date: 2014-08-27
中国人民解放军陆军军官学院
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Problems solved by technology

Although this method avoids the influence of geometric factors in backscatter lidar, it is very suitable for detecting the spatial distribution of atmospheric aerosol near the surface; not caught

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  • Method for measuring geometrical factors of backscattering laser radar
  • Method for measuring geometrical factors of backscattering laser radar
  • Method for measuring geometrical factors of backscattering laser radar

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Embodiment Construction

[0041] The preferred modes of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0042] see figure 1 , the measurement method of backscatter lidar geometry factor is as follows:

[0043] first,

[0044] The distance between the selected CCD camera and the emitted beam is 5-200m;

[0045] The number of dark photons of the CCD camera at -20 degrees is less than 1 photon number / pixel, the total opening angle is greater than 60 degrees, and the resolution angle is less than 0.03 degrees / pixel;

[0046] The wavelength of the backscatter lidar is 532nm, and the pulse energy is ≥50mJ.

[0047] Secondly,

[0048] The aerosol backscattering coefficient is measured using a CCD camera, and the process is:

[0049] Step 1. Firstly, the CCD lateral lidar is operated in the horizontal direction during the time period when the atmosphere is relatively uniform, and the aerosol ratio phase function value and the atmospheric Mo...

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Abstract

The invention discloses a method for measuring geometrical factors of a backscattering laser radar. According to the method, after an aerosol backscattering coefficient is measured by using a CCD camera, the aerosol backscattering coefficient is substituted into a backscattering laser radar equation (please see the equation in the specification), in the equation, P(z) is an atmospheric backscattering echo signal at the position of a laser radar receiving distance z, C is an energy-containing constant of a laser radar system, eta(z) is a geometrical factor, beta1(z) and beta2(z) are the aerosol backscattering coefficient and an atmospheric molecule backscattering coefficient at the position of the distance z respectively, alpha1(z) and alpha2(z) are an aerosol extinction coefficient and an atmospheric molecule extinction coefficient of the distance z, and dz is height resolution; the geometrical factors of the backscattering laser radar are obtained through an iteration method. The measured geometrical factors are extremely high in accuracy and easy to measure, the measured geometrical factors are used for correcting signals of the backscattering laser radar, and therefore atmospheric parameter and pollutant concentration detection accuracy in a transition area is greatly improved; the method can be widely applied to detection of atmospheric pollutants of a short distance section through the backscattering laser radar.

Description

technical field [0001] The invention relates to a method for measuring geometric factors of laser radar, in particular to a method for measuring geometric factors of backscattering laser radar. Background technique [0002] Backscatter lidar is a powerful tool for detecting atmospheric parameters and pollutants in the atmosphere, but because its transmitter and receiver are at the same position, there are blind spots and transition zones in the short-distance range. The so-called blind area is the area where the lidar cannot detect the backscattered signal of the emitted beam; the so-called transition area is the area where the lidar detects part of the backscattered signal of the emitted beam. The commonly used geometric factor η describes the completeness of the detected backscattered signal of the emitted beam. η=0 is called the blind zone, 0<η<1 is called the transition zone, η=1 is the complete receiving zone, and after the transition zone is the complete receivin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/49
Inventor 陶宗明麻晓敏单会会史博赵素贵陈宇梅洛勤张强华储德林
Owner 中国人民解放军陆军军官学院
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