Measurement method and apparatus for laser radar ratio of aerosol

A technology of laser radar and measuring devices, applied in measuring devices, radio wave measurement systems, climate sustainability, etc., to reduce parameter assumptions and ensure accuracy

Inactive Publication Date: 2015-08-19
NANJING UNIV OF INFORMATION SCI & TECH
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  • Abstract
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Problems solved by technology

Currently, there are no new technologies other than lidar technology available for measuring the ratio of lidar to aerosols.

Method used

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  • Measurement method and apparatus for laser radar ratio of aerosol

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Embodiment 1

[0023] like figure 1 Shown: a measuring device for aerosol lidar ratio, including a laser beam light source 1, an attenuation sheet 2, a spectroscope, an aerosol containing space 10 and a light energy detector, the attenuation sheet has a transmittance of 0.01, and is located on a laser beam Between the beam light source 1 and the beam splitter, it is used to attenuate the energy of the laser beam. The laser beam source 1 produces a laser beam that passes along one side of the aerosol accommodating space 10. The first beam splitter 4 and the second beam splitter 6 on the side, the first beam splitter 4 splits the laser beam and makes the reflected light enter the aerosol accommodation space 10, and the second beam splitter 6 passes through the aerosol accommodation space 10 The reflected light is split again, and the light energy detector includes a first detector 5 for measuring the transmitted light energy of the laser beam passing through the first beam splitter 4, and a se...

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Abstract

The invention discloses a measurement method and apparatus for a laser radar ratio of an aerosol. The measurement apparatus a laser beam source, a spectroscope, an aerosol accommodation space, and a detector. The method comprises the following steps: measuring and obtaining a light energy value E0 of laser before aerosol scattering, a light energy value E of laser after aerosol scattering, and a light energy value Eback of backward scattering light during aerosol scattering of the laser; and the carrying out calculation to obtain aerosol laser radar ratio S according to a formula: S=(E0-E)/Eback. According to the previous method, hypothesis of a laser radar ratio of an aerosol needs to be carried out and then inversion of an aerosol extinction coefficient and a backscattering coefficient of the laser radar can be carried out. However, with the provided method and apparatus, single-point sampling of the laser radar ratio of the aerosol can be realized; the parametric hypothesis during the laser radar aerosol profile measurement technology process can be reduced; and the accuracy, comparability, and representativeness of measurement data can be guaranteed.

Description

technical field [0001] The invention relates to the technical field of aerosol measurement methods and equipment, in particular to an aerosol laser radar ratio measurement method and device. Background technique [0002] The degree of depolarization of aerosol is a physical parameter that reflects the shape characteristics of aerosol particles. At present, researchers at home and abroad use micro-pulse lidar technology to measure the degree of depolarization of aerosols, reflecting the spatial distribution of aerosols with different particle shapes with height, such as the depolarization of particles in cirrus clouds about 10 kilometers away Compared with the depolarization degree of other types of aerosols, the degree of depolarization is much larger, and the depolarization degree of water particles close to spherical shape is very small and close to zero. So far, only micro-pulse lidar can be used in the world to measure the depolarization profile of aerosols, which can b...

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 曹念文谢银海杨少波祝存兄
Owner NANJING UNIV OF INFORMATION SCI & TECH
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