Method of obtaining spectrum distribution of aerosol particles based on integrating nephelometer

Abstract

The invention discloses a method of obtaining a spectrum distribution of aerosol particles based on an integrating nephelometer. The method comprises measuring a total scattering coefficient of the aerosol at 7-170 DEG and a backscattering coefficient of the aerosol at 90-170 DEG through the integrating nephelometer, obtaining calculated values of the total scattering coefficient and the backscattering coefficient of corresponding angle ranges based on an assumption that the spectrum distribution of aerosol particles is two lognormal distribution superimpositions and a Mie scattering theory, and analyzing relative deviations of the measured values and the calculated values. A spectrum distribution with a minimum relative deviation is the spectrum distribution of the aerosol particles.

Description

technical field [0001] The invention relates to the field of atmospheric optics, in particular to a method for obtaining spectral distribution of aerosol particles based on an integral turbidimeter. Background technique [0002] The spectral distribution of atmospheric aerosol is a physical parameter widely used in lidar data inversion calibration, light transmission theory and experimental research. In addition, it is also an important parameter in the study of aerosol physical and chemical properties. Therefore, for atmospheric aerosol spectrum The measurement of the distribution appears to be very important. The particle spectrum distribution range that determines and affects the optical properties of aerosol scattering and absorption is mainly 0.01–10 μm. Currently, there are many methods for measuring the spectral distribution of aerosols at 0.01–10 μm. It mainly includes using a scanning migration particle size analyzer to measure the electromigration particle size di...

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Problems solved by technology

To obtain the spectral distribution of 0.01–10 μm requires the joint simultaneous observation of the scanning migration particle size analyzer and the aerodynamic particle size analyzer, and the spectral distribution measured by them is not the optical particle size, which needs to be converted, and the structure of these instruments is relatively complex, and the maintenance cost High, the use is easily affected by the external field measurement environment and prone to failure, so it is difficult to use these instruments for long-term external field measurement experiments to obtain aerosol particle spectrum distribution in a wide scale range

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