Particulate matter real-time measuring device based on beta-ray absorption/light scattering principle

Abstract

The invention discloses a particulate matter real-time measuring device based on a beta-ray absorption / light scattering principle. Different detection assemblies measure the same sample, so that the correction value is more accurate, the overall structure is more compact, the air pump works continuously, data measured by the optical scattering module is continuous and effective, when the beta-ray detection module moves a paper tape to replace an enrichment point, an air path is automatically switched, the air flow passes through the optical scattering module, bypasses the beta-ray detection module and is directly discharged through the air pump, so that the beta-ray detection module is not influenced by air suction when moving the paper tape, and can normally enter the next sampling period on the premise of not shutting down the pump.

Description

technical field [0001] The invention relates to the field of atmospheric particle detection, in particular to a particle real-time measurement device based on the principle of beta ray absorption / light scattering. Background technique [0002] At present, the gas system of the real-time particle measurement device based on the principle of β-ray absorption-light scattering is mainly divided into two types: separate gas system and common gas system. [0003] In the split gas path system, the β-ray method and the light scattering method do not measure the particles in the same gas path. At this time, using the β-ray method as the standard will lead to measurement errors. [0004] In the common gas path system, although the series design of the β-ray detection module and the optical scattering module can ensure the consistency of the target gas samples measured by the two, the β-ray detection module needs to move the paper tape to replace the enrichment after a sampling period....

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Problems solved by technology

[0003] In the split gas path system, the β-ray method and the light scattering method do not measure the particles in the same gas path. At this time, using the β-ray method as the standard will lead to measurement errors

[0004] In the common gas path system, although the series design of the β-ray detection module and the optical scattering module can ensure the consistency of the target gas samples measured by the two, since the β-ray detection module needs to move the paper tape to replace the enrichment after a sampling period At this point, the air pump will stop working. The design of the common gas path will cause the concentration of the data measured by the optical scattering module to be close to 0 during the time when the pumping is stopped. Therefore, it is necessary to find a common path and ensure that the optical scattering module Means and methods for continuous and efficient measurement of data

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