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PM2.5 sensor which kind of good? Laser VS infrared
CLASS: QSI Laser Diode      DATE:2016-3-23    SOURCE:www.longstartech.com.cn

With frequent fog and haze weather in northern China, people pay more attention to the quality of the air. Mobile terminal weather information column to join the fog and haze data, even the central broadcast of the weather forecast has also joined the fog and haze information. PM2.5 as the main component of the haze began to be widely concerned, and for the PM2.5 in the air detection instruments are emerging, then the problem of what PM2.5 detector good?

In the current field of PM2.5 detection of dust particles, PM2.5 detector mainly uses two kinds of dust sensors: infrared dust sensor and laser (diode Laser) dust sensor.

Structure and principle of the infrared principle dust sensor structure and the circuit is relatively simple. The light source is an infrared LED light source, and the air inlet and the air outlet mainly rely on the resistance to heat to obtain the hot gas flow. The output signal is only PWM model. The structure and circuit of the laser sensor are relatively complex. Its light source is laser diode. The sampling air is driven by a fan or a blower, and is tested by means of a complex design of the duct. When air fine particles entering the laser beam region, the laser scattering; light scattering 360 degrees in the space radiation, we in the appropriate position placed photoelectric detector, which only receives light scattering, and then through the photoelectric effect photoelectric detector produces a current signal, after amplification circuit and processing can be obtained fine particulate matter concentration values. The output signal is generally the serial port output.

Price and cost infrared principle dust sensor in the industry has been mature for many years, the market price of about twenty yuan. And laser dust sensor in the industry has just emerged, the price of 200 yuan. The cost difference between the two, mainly because of the cost of the material in the latter increased the laser generator and fan and other institutions and the need for complex circuit structure, and a high technical threshold.

Measurement precision infrared principle dust sensor can only detect particles of more than 1 microns, the measurement accuracy is insufficient. Because the infrared LED light scattering particle signal is weak, only to 1 micron particles greater than a response, and only with resistance heating to promote air sampling, small data samples, data calculation completely by the host computer. The laser sensor can detect particles of more than 0.3 microns. Because that comes with high performance CPU, a lot of data collected by a fan or blower, through analysis of professional particle counting algorithm. To sum up, the sampling number, the data source and the algorithm has more advantages than infrared dust sensor.

Application occasions due to lack of accuracy, the infrared principle sensor is mainly used for industrial and mining dust, detection of large particle size, high concentration of dust, the detection level is mg/m3, can not accurately measure the concentration of PM2.5. And the principle of laser sensor is mainly used in the field of PM2.5 detection, in order to quantify the quality of PM2.5. Can be embedded into the household (car, hand-held) air detector, air purifier. In addition, the principle of laser sensor in the Internet of things data collection, environmental quality testing and other fields also have applications.

Development trend in the laser sensor before entering the field of civil, air purifier in a large number of the use of infrared sensors. But with the development of the air purification industry, the cost of laser principle sensor is gradually reduced, the end customer demand for accurate measurement of air quality is also getting higher and higher. The use of laser principle sensor, accurate quantification of PM2.5 quality is the industry's recognized trends. This year has been part of the air purifier using a laser sensor.