Fine particles are also called PM2.5. Fine particles refer to particles with a diameter of air dynamic equivalent in the ambient air less than or equal to 2.5 microns. It can be suspended in the air for a long time. The higher the concentration in the air, the more severe the air pollution is. The impact of PM2.5 on the atmospheric environment and human health is also greater, which is the main murderer who leads to black lungs and haze days.
MEMS sensor is a cutting -edge research field developed on the basis of microelectronics technology. After more than forty years, it has become one of the major scientific and technological fields of the world. It involves a variety of disciplines and technologies such as electronics, machinery, materials, physics, chemistry, biology, medicine, etc., and has broad application prospects.
Compared with other types of gas sensors, infrared gas sensors have a lot of advantages, such as good selectivity, long life, no dependence of oxygen, small interference by the environment, not easy to poison, high accuracy, etc. With the development of sensing technology, more and more advanced infrared gas sensors have appeared on the market.
Many people may not know much about ammonia, but they must have smelled it. There are ammonia existence in unclean toilets, crowded people etc. As a "useful" and "toxic" gas, ammonia gas exists in all walks of life, and sensors used to measure ammonia gas are also widely used in different industries.