Update: 2019-10-14 17:42 Source: LUFTMY
Haze has become one of the air quality parameters for national prevention and control. PM2.5, PM10 and even PM1.0 are not unfamiliar terms for inhalable particulate matter.With the development of air quality monitoring in the whole city, inhalable particulate matter and gas sensors have become the core of sensing technology.The quality of sensors directly affects the final air quality monitoring values, and plays a vital role in the control and management.
PM2.5 ambient air quality
At present, the common PM2.5 sensors in the market are divided into infrared sensors and laser sensors. So what are the characteristics of these two sensors?
The cost of infrared PM2.5 sensor is generally between 20 and 30 yuan due to its simple structure.
The price of the laser PM2.5 sensor is several times that of the infrared PM2.5 sensor due to its complex structure, fan or blower, or high performance CPU.
The infrared PM2.5 sensor USES LED light source, and the sensor generates heat through resistance to bring air into the detection field. After the particles touch the LED light source, the reflection phenomenon occurs, and the photosensitive detector receives the reflected light of different intensity. When a particle passes through, a high level is output, and the signal is amplified, processed and calculated to obtain the detection result. However, due to the use of resistance to heat air into the test field in this way, there is less air entering the test field, resulting in incomplete detection.
The laser PM2.5 sensor USES a laser diode, which sends a large and stable amount of air into the detection field via a fan or blower. The light scattering phenomenon occurs between the particle field and the laser. The photoelectric detector receives the strength of these beams and generates the current signal through the photoelectric effect. The signal is amplified, processed and calculated to obtain the detection result.
Generally, the particulate matter sensor based on the infrared principle can only measure the particulate matter above 1um, and due to the problems of the monitoring principle, it is unable to accurately measure the concentration of PM2.5.
The laser-based particle sensor can measure particles above 0.3um, a level of microgram per cubic meter (ug /m3), so PM2.5 concentrations can be measured with relative accuracy.
Infrared PM2.5 sensor can only be used to monitor dust in mining areas and construction sites with low accuracy requirements, and to monitor the general trend of particulate matter.
The laser PM2.5 sensor is more widely used in indoor air quality monitor, various haze table, air purifier, fresh air system, vehicle monitoring and so on. It is also widely used in Internet of things data collection and environmental air quality monitoring.
The research and development trend of infrared PM2.5 sensor is slow due to its narrow application field.
As the whole people pay more attention to haze monitoring, the laser PM2.5 sensor is booming in research and development. No matter in the sensor volume, structure simplification, accuracy improvement, price cost aspect all has the unceasing enhancement. At the same time, the laser PM2.5 sensor has become the most commonly used PM2.5 sensor in the market due to its relative stability, reliable data, easy replacement, mature technology and other advantages.
In addition, if PM2.5 laser sensor is used in environmental level measurement, outdoor protective cover and various accessories are needed. In addition to the principle of laser, environmental level air quality monitoring will also be more applied to the principles of gravimetry, micro-oscillation balance, beta-ray method and so on. Of course, the purpose of different principles of monitoring is to obtain more real air quality monitoring data, with which we can manage and control air quality, and ultimately benefit from the health of our breathing.PM2.5 sensor manufacturer LUFTMY, dust detection sensor HPD05 USES the principle of optical scattering to obtain the concentration of particles, and through the conversion of optical circuit and circuit, the dust concentration within the detection range can be measured. Infrared pm2.5 sensor HPD05 has the characteristics of small size, high accuracy, low power consumption, short response time, etc. This infrared pm2.5 sensor can be applied in air purifier, etc. More dust sensor price please consult online.