Dual-channel dust concentration sensor and dust concentration detection method thereof

Abstract

The invention relates to a dual-channel dust concentration sensor and a dust concentration detection method thereof, belonging to the technical field of sensors. The sensor comprises a detection light source unit, a calibrating light source unit, a light receiving unit, a signal processing unit and a light source control unit, wherein the detection light source unit and the calibrating light source unit respectively use an infrared light source and a laser light source, so that infrared light source detection can be compensated by virtue of a detection result of the laser light source by using the sensor and the detection method thereof, further, the detection precision can be effectively improved by using the infrared light source, meanwhile, the service time of the laser light source is shortened and the service life is prolonged. The dual-channel dust concentration sensor is simple in structure and low in cost. Due to the adoption of the dust concentration detection method using the sensor, the application mode is simple and the application range is relatively wide.

Description

technical field [0001] The invention relates to the technical field of sensors, in particular to the technical field of gas sensors, in particular to a dual-channel dust concentration sensor and a dust concentration detection method thereof. Background technique [0002] With the development of the national economy and the improvement of people's living standards, the quality of the air environment has attracted people's attention. In recent years, dust has attracted much attention as one of the most important pollutants in the air. Dust is extremely harmful to human beings, especially small-sized particles, which can float in the atmosphere for a long time, are difficult to settle to the ground, and easily enter the human respiratory tract, and the smaller the particle size, the deeper the settlement position in the human respiratory tract, and the harm will be bigger. Therefore, the measurement of dust concentration is of great significance in the field of environmental ...

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Problems solved by technology

[0005] At present, the main light sources used are infrared light and laser: the characteristics of using infrared light source include slow light attenuation of core optical components, general service life of more than 7 years, basically no data drift, low cost, and are currently widely used in various dust sensors Above, but its main problem is that due to the wavelength of infrared light, the minimum detectable particle size is above 1 micron, and the accuracy is also very low; while the sensor using a laser light source can detect dust particles with a minimum particle size of 0.3 micron, the measurement accuracy is greatly improved Improvement, but its disadvantage is that the service life of the laser light source is about 8000 hours, and it decays quickly with use, resulting in serious drift of measurement data, and the cost is also high

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