The light scattering method has the advantages of simple structure and good real-time performance in measuring the mass concentration of particulate matter. It is usually used to calibrate the laboratory standard particles to ensure the accuracy of measurement. However, the actual measured particle size of pollutant particles is complex and changeable, it is necessary to explore the scattering light intensity distribution law in multi-detection angles under different particle sizes. The numerical simulation results obtain scattering light intensity distribution of silica particles under different polarization state light sources, and get the appropriate range of detection angle. This paper mainly designs a set of device to measure the scattering light intensity and mass concentration of particulate matter. Meanwhile, the standard instrument TSI was used to measure the real-time change of the mass concentration of particulate matter. The results show that the scattering light intensity signal measured by photodetector is highly correlated with the mass concentration measured by the TSI standard instrument, and the mass concentration of the particles measured by the system is in good agreement with the standard instrument TSI. The scattering light intensity can effectively invert the real-time mass concentration of particulate matter. The experimental device is suitable for real-time measurement of particulate matter mass concentration.
In recent years, studies on fine particulate matter have shown that high concentrations of particulate matter seriously affect the quality of weather, creating a series of severe weather such as haze and posing a great risk to human health. The results of epidemiological studies suggest that particulate matter is associated with a higher risk of cardiopulmonary mortality and morbidity. Therefore, there is an urgent need to conduct research on particulate matter to solve the human health problems caused by particulate matter pollution. The identification of the compositional characteristics of particulate matter presupposes the separation of particulate matter with different aerodynamic diameters and provides scientific guidance for solving the problem of atmospheric particulate matter pollution. To address this problem, a virtual impactor with a cutting particle size of 1.2 μm is designed in this paper. The influence of key parameters on the performance of the virtual impactor is also discussed. The results show that the proposed virtual impactor has a cutting particle size of 1.2um and a good steepness of the collection efficiency curve. It shows that it can effectively separate atmospheric particulate matter according to particle size and provides a design basis for realizing a low-cost atmospheric particulate matter mass concentration detection instrument. Meanwhile, we design a microfluidic chip for particulate matter detection based on this virtual impactor. The hardware circuit of this microfluidic chip is also designed.
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