A method for measuring the mass concentration of particulate matter

Abstract

The invention relates to a method for measuring the mass concentration of particulate matter. A processor controls a sampling pump to make airflow enter from a particulate matter collection unit, collects atmospheric particulate matter information, and determines whether an instrument needs to be calibrated. The parameter values ​​of the light scattering measurement module are calibrated, and after the parameter calibration is completed, the light scattering measurement module is turned on; if calibration is not required, the measurement is performed directly through the light scattering measurement module. The invention combines the measurement of particle concentration by the light scattering method with the β-ray method, and has both accurate measurement and online real-time direct reading data; the β-ray calibration module and the light scattering measurement module share a set of gas paths to ensure that various conditions are consistent in the calibration process. Reduce error factors; at the same time, when the measurement environment changes, use the β-ray calibration module to calibrate the parameters of the light scattering measurement module, and use the light scattering measurement module alone to measure the particle concentration when the measurement environment does not change.

Description

technical field [0001] The invention relates to a method for measuring particle mass concentration, belonging to the field of particle concentration measurement. Background technique [0002] Since the environmental pollution caused by pollution sources such as industrial boilers, power plant boilers and industrial kilns is quite serious, countries all over the world have carried out in-depth research and control on this, which requires the detection of the concentration of particulate matter and dust emitted by them. At present, the commonly used detection methods include light scattering method, β-ray absorption method, opacity method, light transmission method and so on. [0003] The principle of the light scattering method is: the light beam from the light source is irradiated into a certain space (measurement area) containing the particles to be measured, so that scattering occurs, and the scattered light is converted into an electrical signal by a photoelectric receive...

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Problems solved by technology

[0005] Other methods such as opacity method and light transmission method also have the above problems. At present, there is no method that can not only avoid the influence of environmental particles, frequently calibrate the parameter values, but also read the particle concentration value online in real time.

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