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Application of PM2.5 sensor in dust monitoring system

by:Rika Sensors     2021-10-16
Application of PM2.5 sensor in dust monitoring system
With the continuous development of society, the air quality is constantly deteriorating. The air in the haze weather contains a lot of polluting particles and microorganisms. On February 28, 2013, the National Scientific and Technical Terms Review Committee stated that PM2.5 was to be officially named 'fine particulate matter'. In addition to PM2.5, there are: dust (TSP), floating dust (PM10), fine dust (PM2.5), haze dust (PM1). Since then PM2.5 has officially entered our lives.

PM2.5 refers to particles (solid and liquid particles that can be suspended in the air) with an aerodynamic equivalent diameter of less than or equal to 2.5 microns. It is rich in a large amount of toxic and harmful substances and has a long residence time in the atmosphere and a long transportation distance, so it has a greater impact on human health and the quality of the atmospheric environment. The source of PM2.5. There are mainly natural sources and man-made sources, the latter is more harmful.

Natural sources include soil dust (containing oxide minerals and other components), sea salt (the second largest source of particulate matter, and its composition is similar to that of sea water), plant pollen, spores, bacteria, etc. Natural disaster events, such as volcanic eruptions, discharge a large amount of volcanic ash into the atmosphere, forest fires or bare coal fires and dust storms will transport large amounts of fine particles into the atmosphere.

Man-made sources include fixed sources and mobile sources. Stationary sources include a variety of fuel combustion sources, such as power generation, metallurgy, petroleum, chemistry, textile printing and dyeing, and other industrial processes, heating, and cooking. The flow source is mainly the exhaust gas emitted into the atmosphere when various vehicles use fuel during operation.

Dust from construction sites is one of the three major sources of dust pollution, and it is also the focus of monitoring and remediation. At present, the main method of detecting dust is manual sampling and analysis, which is low in detection efficiency and wastes a lot of manpower and material resources. Therefore, in order to improve the efficiency of dust monitoring at construction sites, we independently researched and developed a dust monitoring system, which is mainly used for environmental monitoring equipment at construction sites. It is composed of noise dust monitoring station, transmission system, monitoring software cloud platform and spray system (fog cannon), which can monitor PM2.5, PM10, ambient temperature and humidity, wind speed and direction, noise monitoring, video monitoring and pollutants in the on-site environment. Exceeding standard video capture (optional), toxic and hazardous gas monitoring (optional) and other functions; the data platform is a networked platform with Internet architecture, which has monitoring functions for each sub-station and alarm processing, recording, and query of data , Statistics, report output and other functions. The system can also be linked with various pollution control devices to achieve the purpose of automatic control.

Among them, the PM2.5 sensor can be used to detect the PM2.5 concentration in the air. At present, the mainstream pm2.5 sensor in the market is monitored based on the principle of laser scattering.

Particles will scatter light under the irradiation of light. When a beam of parallel light is incident on the measured particles, the particles will scatter the light. The photosensitive element next to it will convert the light signal of the scattered light into an electrical signal. The electrical signal is amplified and processed. Through a mathematical model, the particle size and air flow rate of the gas passing through the sensor can be roughly calculated. After a complex mathematical algorithm, the final result is more realistic. The PM2.5 value.

The air quality sensor adopts the principle of laser scattering measurement and is screened through a unique dual-frequency data acquisition technology to obtain the number of particles of equivalent particle size per unit volume. The algorithm calculates the particle mass concentration of the equivalent particle size per unit volume. PM2.5 and PM10 are output at the same time. The equipment adopts advanced laser anti-attenuation technology to ensure the long-term stability of the equipment. The measurement range is 0-1000ug/m³. The dual-frequency data acquisition and automatic calibration technology can achieve a consistency of ±10%.



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