Method for measuring concentration of particulate matter, and device adopting method

Abstract

The invention belongs to the technical field of concentration measurement of atmospheric particulates, and particularly relates to a method for measuring the concentration of a particulate matter by a PIV (Particle Image Velocimetry) method, and a device adopting the method. The method comprises the following steps of: acquiring the size, shape and volume of each particle and calculating the mass of all types of particles; calculating the total sampled air volume according to the known flow and measurement time; and calculating the concentration of a particulate matter (PM) to be measured. Not only the method is convenient and quick in measuring and calculating, but also the calculating precision can be effectively ensured. The device comprises a particulate matter sampling mechanism, a filter strip conveying mechanism, a beta-ray radiation mechanism and a beta-ray receiving and measuring mechanism; the device further comprises a damping control component and a power unit, wherein the damping control component is close to the radiation outlet end of a beta-ray radiation source; and a PIV unit is also included. The device has the advantages of safety and reliability in use, simple and practical structure, correspondingly and remarkably improved occupied area and maintenance efficiency, and high measuring accuracy.

Description

technical field [0001] The invention belongs to the technical field of atmospheric particle concentration measurement, and in particular relates to a method for measuring particle concentration based on a PIV velocity measurement method and a device applying the method. Background technique [0002] As a device for measuring the concentration of particulate matter (Particulate Matter, hereinafter referred to as PM) in the atmosphere, there is a type of device that continuously inhales a certain flow of air as a sample gas into a sampling tube or an atmospheric introduction tube, and then installs it in the sampling tube. The collection area on the downstream side continuously captures the PM in the sample gas with a filter belt or other capture device, and irradiates the captured PM with a β-ray radiation source (usually a C14 radiation source) with β-rays. When the β-ray emitted by the source hits the PM, the β-ray will be absorbed by the PM, resulting in the attenuation of...

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Problems solved by technology

[0003] The above-mentioned traditional inhalable particulate matter measurement device based on the β-ray absorption method has the following defects: first, the recovery time requirement for the β-ray detector is relatively high; second, it is difficult or even impossible to control the impact of the total radiation dose of the β-ray on the surrounding environment , so as to create unfavorable hidden dangers for the surrounding technicians and related environments; thirdly, most of the detection equipment for PM measurement and calculation by the β-ray method currently on the market can only realize automatic measurement for one of PM2.5 or PM10. For the simultaneous measurement of the two, it is necessary to install a special measurement mechanism for measuring another PM concentration, which often leads to an excessively large footprint and cumbersome maintenance operations. It should be avoided as much as possible; the most important thing is that the current method for measuring the concentration of PM particles is too simple, nothing more than the above-mentioned

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