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how to choose PM2.5 detection sensor!

2021-09-19 15:56
In the field of dust sensors, due to cost constraints, laser LEDs are generally used as light sources. It is widely used in medical, security, communication, remote control and sensing fields. Benefiting from the continuous maturity of infrared LED technology in recent years, infrared LED has the characteristics of long life, high emission efficiency, good monochromaticity and good directionality. This makes infrared LEDs widely used in the sensor field, especially in the dust sensor industry.
 
In the current field of dust particle PM2.5 detection, two types of dust sensors are mainly used: infrared dust sensors and laser dust sensors.
 
1. Structure and Principle
 
2. Price and cost
 
Infrared dust sensors have been used in the industry for many years, and the market price is much lower than that of lasers. The cost gap between the two is mainly due to the addition of laser generators and fans to the material cost of the latter and the need for complex circuit structures. There is a high technical threshold.
 
3, measurement accuracy
 
The infrared principle dust sensor can only detect particles above 1um, and the measurement accuracy is insufficient; while the laser dust sensor can detect particles above 0.3um. Because it comes with a high-performance CPU, it uses a fan or a blower to collect a large amount of data and analyzes it through a professional particle counting algorithm; in summary, it has more advantages than an infrared dust sensor in terms of sampling number, data source, and algorithm.
 
4 application occasions
 
Due to lack of accuracy, the infrared principle sensor is mainly used for industrial and mining dust. The detection object is large particle size and high concentration dust. The detection level is mg/m3, which cannot accurately measure the concentration of PM2.5.
The laser principle sensor is mainly used in the field of PM2.5 detection to quantify the quality of PM2.5 with precision. It can be embedded in household (car, hand-held) air detectors and air purifiers. In addition, laser-based sensors are also used in the fields of IoT data collection and environmental quality detection.
 
5, development trend
 
Before laser dust sensors entered the civilian field, infrared dust sensors were widely used in air purifiers. However, with the development of the air purifier industry and the mass production of laser dust sensors by some large factories, the cost of laser dust sensors is gradually decreasing, and the requirements of end customers for accurate air quality measurement are getting higher and higher. The use of laser principle sensors to accurately quantify PM2.5 quality is a recognized trend in the industry.
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