Boundary layer PM2.5 detection method

Abstract

The invention belongs to the technical field of air detection and relates to a boundary layer PM2.5 detection method. The method comprises the steps of boundary layer division, floating ball setting, suspended area detection, data set coupling and floating ball recovery. A floating ball comprises a power mechanism, a collecting assembly, information modules and a controller. Due to the flowing characteristics of the atmosphere of a boundary layer, the distribution of pollutants is in a disordered state, sampling by adopting an optical radar is limited by regions, a high-precision measurement result is difficult to obtain by utilizing a remote sensing satellite, and the accuracy of PM2.5 detection is weakened; therefore, the range of the divided boundary layer is set through the floating ball, the power mechanism in the floating ball is suspended at different heights in the boundary layer and is used for operation of the collection assembly; PM2.5 is detected for multiple times at different heights in the boundary layer by using a bogie and a hollow pipe in a sampling cylinder, and real-time transmission is carried out on the measured data between the information modules, so that the application effect of the boundary layer PM2.5 detection method is improved.

Description

technical field [0001] The invention relates to the technical field of air detection, in particular to a boundary layer PM2.5 detection method. Background technique [0002] The atmospheric boundary layer is close to the surface of the earth and is mainly affected by the earth-atmosphere interaction and air pollution. Turbulent vertical exchange is its remarkable feature. As the air layer where air pollution mainly occurs, the boundary layer has a significant impact on the diffusion and accumulation of air pollutants; PM2.5 in pollutants refers to particulate matter in the ambient air with an aerodynamic equivalent diameter less than or equal to 2.5 microns. It can be suspended in the air for a long time. The higher its concentration in the air, the more serious the air pollution, and the longer the residence time in the atmosphere and the longer the transportation distance, the more impact it has on human health and the quality of the air environment. Big. [0003] At pre...

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Problems solved by technology

[0003] At present, the detection of PM2.5 in the atmosphere includes the methods of optical ray absorption and micro-vibration balance, all of which need to effectively collect PM2.5 particles, and the boundary layer in the atmosphere has a certain height and is in the process of change. The distribution of matter is different from the atmosphere on the surface. The use of optical radar is limited by the sampling area and produces high costs. It is difficult to obtain high-precision measurement results by using remote sensing satellites, which weakens the accuracy of PM2.5 detection data.

[0004] There are also some technical solutions about the PM2.5 detection method in the boundary layer in the prior art. For example, a Chinese patent with the application number 2012103843325 discloses an automatic reflection of the PM2.5 mass concentration based on a sun photometer and a laser radar. Algorithm, first use the sun photometer to obtain the optical thickness of the entire layer of atmospheric aerosol based on the sun photometer, use the echo signal of the lidar, after correcting the distance and relative humidity, and invert the algorithm to obtain the entire layer of the atmosphere based on the lidar Sol extinction coefficient and aerosol optical thickness, and then use the ideal curve fitting to determine the boundary layer height, obtain the aerosol optical thickness in the boundary layer, and finally use the above results to obtain the PM2.5 mass concentration value according to the model; the technical solution uses a solar photometer Combined with the aerosol extinction coefficient profile and optical thickness value obtained by lidar, combined with ground relative humidity correction and boundary layer height information, the PM2.5 mass concentration value near the ground is obtained, which has small error, high discrimination and strong universality. Advantages; however, the optical lidar used in this technical solution has a high cost of use and is not convenient to use at multiple atmospheric measurement points. At the same time, it is necessary to calculate the concentration of pollutants through a data model, which increases the detection data of PM2.5 offset

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