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1. The research status In 1908, Gustav Mie analyzed the scattering of spherical particles according to Maxwell's equations, and first obtained the calculation method of scattering and absorption of spherical particles illuminated by light waves. It provides a solid theoretical basis for the optical study of particulate matter. All walks of life pay more and more attention to the study of particle detection by light scattering. The scattering method has been widely developed since the 1980s....

Air pollution is everywhere. No matter where you live, you can't escape it, and the pollutant that affects people the most is particulate matter. We all know that atmospheric particulate matter is a general term for all kinds of solid and liquid particulate matter in the atmosphere, often abbreviated as PM and used as a measure of air pollution. According to the diameter, atmospheric particulate matter can be divided into three types: Total Suspended Particulate Matter with a diameter less than...

After a long period of development and improvement, there are more than 200 measurement methods based on different working principles. Light scattering has gradually attracted people's attention and has been favored since 1980, and has been widely developed in recent years. Its production practice technology has also been substantially improved. With the continuous enhancement of integrated chip functions, a dust concentration sensor has been initially formed based on light scattering theory....

1. The background and significance of the research The atmospheric particle refers to the particle with extremely small grain sizes, which is one of the most important factors affecting the climate and human environment. Industrial production and human activities are the main reasons for the increase in the concentration of atmospheric particles due to pollution of the atmospheric environment. The use of China’s coal exceeds 70% of the energy consumption. As the main energy source in China,...

The higher the concentration of PM2.5 in the air, the more serious the air pollution becomes. As air pollution becomes more and more serious, people are paying more and more attention to PM2.5. PM2.5 refers to particles with a median diameter of 2.5 microns or less in the aerodynamics of the ambient air.   To have more accurate monitoring of PM2.5 in the atmosphere, I learned that China has built the world's most atmospheric monitoring station, and the national monitoring network for PM2.5...

I. Structure and Principle 1. Laser dust sensors When we mention the phrase "laser", the first thing that comes to mind is the cool and powerful laser weapons in science fiction movies. In fact, lasers are widely used not only in the military, but also in medical, illumination, ranging, cutting, IT and other fields. The word "LASER" stands for Light Amplification Stimulated Emission Radiation. Common lasers can be generally divided into three types: solid lasers,...

1. Properties of PM2.5 & PM10 PM2.5 refers to particulate matter smaller than 2.5 micrometers in the air, also known as fine particulate matter and particulate matter which can go directly to the alveoli of the lungs. PM2.5 has a small particle size and strong activity, and is easy to carry toxic and harmful substances. It can stay in the atmosphere for a long time, which has a great impact on human health. PM10, a kind of inhalable particulate matter with particle...

Air pollution results in millions of premature deaths throughout the world each year. Rapid industrialization has wrought intense levels of air pollution that pose a serious threat to people's health. Air purifiers are widely used as home appliances, effectively removing PM2.5 and improving indoor air quality. How to choose an air purifier and how to exactly know its purification effect? Its built-in dust sensor is the key and it can realize intelligent monitoring and automatic...

1. Appliance & Electronics World Expo (AWE) Date: March 23-25, 2021 Address: National Exhibition and Convention Center (Shanghai) Exhibition Area: 150000㎡ The Number of Exhibitors: 2000+   2. AIRVENTEC CHINA (SHANGHAI) 2021 Date: June 2-4, 2021 Address: National Exhibition and Convention Center (Shanghai) Exhibition Area: 10000㎡ The Number of Exhibitors: 300+