A method and system for monitoring the concentration of microparticles in the air

Abstract

The invention discloses a method for monitoring the concentration of micro-particle in air by combining a dielectrophoresis force principle and a quartz crystal microbalance technology. The method comprises the following steps: quantitatively conveying the air into an electrolyte solution so that micro-particles in the air are dispersed in the electrolyte solution; measuring the mass of the micro-particles, which are dispersed in the electrolyte solution and in a certain radius range, by utilizing dielectrophoresis force collection and deposition through a quartz crystal microbalance; and calculating and processing to obtain the concentration of the micro-particles, in the certain radius range, in the air. The invention further discloses a system designed based on the method, and the instantaneity and the complete automation of the monitoring of the micro-particles in the air are realized. The system comprises an air sampling part, a detection part, a data processing part and a manipulation part, wherein the air sampling part is used for collecting the air and measuring the sampling volume; the detection part is used for separating and measuring the mass of the micro-particles in different radius ranges; the data processing part is used for collecting data and finishing the concentration calculation; and the manipulation part is used for driving and controlling all the parts of the system to operate.

Description

technical field [0001] The invention relates to a monitoring method and system for the concentration of microparticles in the air. More specifically, the present invention relates to a method and system for monitoring the concentration of microparticles in the air by combining the principle of dielectrophoretic force and quartz crystal microbalance technology. Background technique [0002] Particulate matter in the air is the main cause of reduced visibility and haze, which seriously threatens the driving of vehicles on the ground and the take-off and landing of aircraft, and is the main culprit of traffic accidents and air crashes. Fine particles with a particle size of less than 2.5 μm (hereinafter referred to as PM2.5) will directly enter the bronchi and deep lungs, interfere with the gas exchange in the lungs, and cause diseases including asthma, bronchitis, and cardiovascular diseases. In addition, these particles can also carry harmful heavy metals and dissolve in the...

AI Technical Summary

Problems solved by technology

In theory, the light scattering method has the advantages of sensitivity, good stability, and easy operation, but the particulate matter in the air will contaminate the optical components and cause a decrease in sensitivity, and the measurement results need to be displayed by conversion coefficients. The direct detection of the concentration of particulate matter in the air is not yet mature.

The piezoelectric crystal method uses an electrostatic sampler composed of a high-voltage discharge needle and a quartz resonator to collect, and measures the quality of particulate matter through a quartz crystal. This method has high sensitivity in theory, but the sampling rate of particulate matter is not high, and high-voltage discharge limits its real-time monitoring. , the feasibility is not high

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