Point pollution source emission flux measurement method based on large-visual-field imaging spectrometer

Abstract

The invention discloses a point pollution source emission flux measurement method based on a large-visual-field imaging spectrometer. The point pollution source emission flux measurement method comprises the steps of analyzing and calculating the inclined column concentration of a polluted gas by a differential absorption spectroscopy algorithm, converting the inclined column concentration into vertical column density (VCD) through a radiation transfer model, and determining a smoke plume width W(smoke) according to the distribution of distances of the column concentration of the polluted gas, wherein the section concentration V of a smoke plume is equal to VCD*W; measuring the vertical column concentration of the polluted gas at the moment T1, and recording a position S1 of a characteristic value; then, measuring the perpendicular column concentration of the polluted gas at the moment T2, and searching a position S2 of the characteristic value which is recorded at the moment T1; and calculating the discharging speed V(smoke) of the smoke plume according to the records. The point pollution source emission flux measurement method is used for measuring the section concentration of the smoke plume and the discharging speed of the smoke plume, and a point pollution source emission flux can be obtained by multiplying the two measured results. The structure is simple, errors are small, and the measurement precision and the efficiency are high.

Description

technical field [0001] The invention relates to the technical field of environmental monitoring, in particular to a method for measuring emission flux of point pollution sources based on a large-field imaging spectrometer. Background technique [0002] According to the spatial distribution of discharged pollutants, it can be divided into point pollution sources and surface pollution sources. Point pollution sources refer to individual pollution sources that emit pollutants in a small area. The emission flux of pollution sources or the inventory data of pollution sources need to be grasped and updated in a timely manner, so that the environmental protection management department can grasp the real environmental conditions, formulate reasonable and feasible emission reduction plans, and ensure good environmental quality. [0003] At present, there are two conventional methods for point source emission flux. One is to install detection instruments on the chimney to measure the...

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Problems solved by technology

Compared with the traditional method, this method has the advantages of high efficiency and rapidity, but it also has shortcomings, mainly in the following two points: First, it needs a mobile platform (vehicle), and needs to choose a suitable measurement path, which brings restrictions to the measurement ;Secondly, it is necessary to measure the wind speed. Generally, the ground wind speed is used, and the ground wind speed is different from the speed of the plume hundreds of meters high. Sometimes it will bring 100% error to the calculation result, which seriously affects the measurement accuracy.

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