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Therefore, for the formaldehyde sensor in this study, the influence of high temperatures on the sensor is very limited. In the actual transportation, storage or working process of the air conditioner, the sensor can ensure the reliability of continuous operation and storage under extremely high temperatures. For the current commercial formaldehyde sensors 2#, 3#, and 4#, traditional liquid acid-base electrolytes are used as proton conduction media. Under high temperatures, the water in the electrolyte...

Abstract: The working life and long-term stability of electrochemical formaldehyde sensors are the main obstacles restricting the popularization and application of formaldehyde sensors in the field of home appliances. Among them, how to improve the long-term working stability of the internal core components of the formaldehyde sensor is the key problem to solving the current formaldehyde sensor's short service life and poor resistance to external harsh environments. In this study, a formaldehyde...

 A PM2.5 sensor is also called a dust sensor, which can be used to detect the dust concentration in the air around us, that is, the value of PM2.5. Dust with a diameter of less than 10μm that can enter the alveolar region is also commonly referred to as respirable dust in Aerodynamics. Most of the dust particles with a diameter of more than 10μm are deposited by impact, and most of them are deposited in the nasopharynx when inhaled by the human body, while the dust below 10μm can enter...

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,...