Update: 2019-09-16 16:24 Source: LUFTMY
With the improvement of living standards, people pay more and more attention to air quality. Especially when winter is approaching, the haze weather becomes more and more. PM2.5, as the main component of haze, has attracted widespread attention, and the detection equipment for PM2.5 in the air has emerged in endlessly. In the current field of dust particle PM2.5 detection, PM2.5 sensor mainly uses two kinds of dust sensors: infrared PM2.5 sensor and laser dust sensor.
The structure and circuit of infrared PM2.5 sensor are relatively simple. Its light source is infrared LED light source. The air inlet and outlet are mainly heated by resistance to obtain hot air flow. There are particles passing through, i.e. high level output, and the output signal is PWM type.
Luftmy infrared PM2.5 sensor GDS06 uses the principle of optical scattering to measure the dust concentration in the detection range through the conversion of optical path and circuit. GDS06 has the characteristics of small size, high precision, low power consumption, short response time and stable operation under high dust concentration. This PM2.5 detection module can be used in air purifier, fresh air system, air conditioning with purification function, PM2.5 detector, etc.
The structure and circuit of laser dust sensor are relatively complex. The light source is a laser diode. Sampled air is driven by fans or blowers and tested through complex designed ducts. When fine particulate matter in the air enters the region where the laser beam is located, it will scatter the laser. The scattered light radiates at 360 degrees in space. We place photoelectric detectors at appropriate locations to receive only scattered light.Then the current signal is generated by the photoelectric effect of the photodetector. After amplification and treatment of the circuit, the concentration of fine particles can be obtained. The output signal is usually serial output.
Laser dust sensor LD07 is a high-precision particle concentration sensor based on MIE scattering theory of laser, which can continuously collect and calculate the particle concentration distribution per unit volume, and output it in the form of universal digital interface. The luftmy dust sensor pm2.5 detection module can be embedded with various air purifiers and other instruments or environmental improvement equipment related to the concentration of suspended particulates in the air, providing timely and accurate concentration data.
Infrared PM2.5 sensor can only detect particles above 0.5 micron. Laser dust sensor can detect particles above 0.1 micron.
Infrared PM2.5 sensor is mainly used for industrial and mining dust. The object of detection is large particle size and high concentration dust. The detection level is mg/m3, so the concentration of PM2.5 can not be accurately measured. Laser dust sensor is mainly used in PM2.5 detection field to quantify PM2.5 quality with accuracy. It can be embedded in household (car-mounted, hand-held) air detector and air purifier. In addition, laser principle sensors are also used in data acquisition, environmental quality detection and other fields of the Internet of Things.
Infrared PM2.5 sensor and laser dust sensor have their own advantages, so there is no exact PM2.5 sensor. It depends on the customer's needs (such as cost requirements, accuracy, signal output, application site, related particulate matter to be tested) to choose the appropriate detector.