Laser-scattering-based air quality detecting system

Abstract

The invention discloses a laser-scattering-based air quality detecting system. The laser-scattering-based air quality detecting system is characterized by comprising a laser transmitting system, a laser receiving system and a sample tank, wherein the laser transmitting system is provided with a laser source and a first photoelectric receiver; the laser emitted by the laser source sequentially passes through a polarizer, an aperture diaphragm, a first condensing lens, a first light splitting mirror and a second condensing lens and then irradiates the sample tank; the other path of light split by the first light splitting mirror irradiates the first photoelectric receiver; the laser receiving system is provided with a third condensing lens and a second photoelectric receiver. The laser-scattering-based air quality detecting system has the remarkable effects of being simple in structure and convenient to mount; the air quality is detected by the laser scattering manner; the light source cost is reduced; the plurality of photoelectric receivers are arranged, so that the system can be effectively corrected; the problem of unstable light source intensity can be solved; the detection accuracy is ensured; the detection requirement of the air quality can be met.

Description

technical field [0001] The invention relates to air quality detection technology, in particular to an air quality detection system based on laser scattering, which belongs to the field of photoelectric detection. Background technique [0002] For air quality detection, the main object of detection is the particulate pollutants in the air, namely PM2.5-PM10. The so-called PM2.5 refers to particulate matter with a diameter less than or equal to 2.5 microns in the atmosphere, also known as particulate matter that can enter the lungs. Although PM2.5 is only a small component of the earth's atmospheric composition, it has an important impact on air quality and visibility. Compared with coarser atmospheric particulate matter, PM2.5 has a small particle size, is rich in a large amount of toxic and harmful substances, has a long residence time in the atmosphere, and has a long transportation distance, so it has a greater impact on human health and the quality of the atmospheric env...

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Problems solved by technology

However, this method requires manual weighing, which is cumbersome and time-consuming.

[0007] (4) Optical absorption method, which obtains the change of corresponding concentration according to the change of laser intensity, but this method still has the problem of low signal-to-noise ratio

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