Reconstruction method for atmosphere trace gas spatial distribution by differential optical absorption spectroscopy tomoscan

Abstract

The invention discloses a reconstruction method for atmosphere trace gas spatial distribution by differential optical absorption spectroscopy tomoscan, which is characterized in that two differential absorption scan optics remote measurement assemblies arranged at two sides of air mass to be measured according to an initial observation angle are performed with simultaneous and timing intersect scanning, an intersect sector light beam geometric optical path is constructed, measurement is carried out according to measurement interval which is determined by sampling rate and ray quantity together, a processor can accurately acquire the characteristic differential absorption spectroscopy of atmosphere trace gas at ultraviolet and visible wave band according to measured spectroscopy data, line integral concentration of the trace gas along the whole optical path is parsed from total atmosphere delustring information; under a sector light beam ray geometric structure, accurate inverting line integral concentration is taken as projection vector, an atmosphere trace quantity component spatial distribution reconstruction algorithm is employed, and a visual two dimensional or three dimensional atmosphere trace gas spatial distribution graph is finally formed. According to the invention, the visual atmosphere trace gas spatial distribution integral information graph can continuously and accurately provide the multi-component atmosphere environment pollution gas at real-time online.

Description

technical field [0001] The invention relates to a method for scanning the spatial distribution of trace gases in the atmosphere, in particular to a method for reconstructing the spatial distribution of trace gases in the atmosphere by differential absorption spectrum tomography. Background technique [0002] The acquisition of the spatial distribution of atmospheric trace component concentrations is affected by complex meteorological, topographical and chemical characteristics, and has certain uncertainties. Obtaining the spatial distribution of atmospheric trace gases is an important tool for the quantitative study of the chemical properties and transport of air pollutants. monitoring of emissions. At present, with the help of the chemical transport model, it is possible to calculate the two-dimensional and three-dimensional spatial distribution of trace gas concentrations in the troposphere about 100 meters away. However, the main problem now is the lack of reliable inp...

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Problems solved by technology

[0003] Existing air pollution gas monitoring mostly adopts multi-point networking and distributed measurement point methods, and the non-sampling areas with data defects can only be based on the data of nearby measuring points. value to estimate its concentration

The instantaneous information released by gas pollutants is missing, and the accuracy of measurement is subject to various factors such as sampling area, number of measuring points, and sampling frequency, and instrument pollution is inevitable

Limited and isolated data points can only measure the "point" concentration information of a single component of pollution gas in a small range, limited time, and cannot provide real-time, online, continuous and accurate overall information on multi-component atmospheric environmental pollution gases

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