Laser-scattering-based air quality detecting system

A technology of air quality detection and laser emission system, which is applied in the direction of radio wave measurement system, measurement device, and utilization of re-radiation, etc. It can solve the problems of low signal-to-noise ratio, cumbersome procedures, time-consuming, etc., and achieve simple system structure and guaranteed detection Accuracy, overcoming the effect of unstable light source intensity

Active Publication Date: 2015-03-18
CHONGQING UNIV
7 Cites 17 Cited by

AI-Extracted Technical Summary

Problems solved by technology

However, this method requires manual weighing, which is cumbersome and time-consuming.
[0007] (4) Optical absorption method, which obtains the cha...
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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.

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  • Laser-scattering-based air quality detecting system

Examples

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Example Embodiment

[0022] The specific embodiments and working principles of the present invention will be described in further detail below with reference to the accompanying drawings.
[0023] Such as figure 1 As shown, an air quality detection system based on laser scattering includes a laser emitting system 1, a laser receiving system 2, and a sample cell 9. The laser emitting system 1 is provided with a laser light source 3 and a first photoelectric receiver 10. The laser light emitted by the laser light source 3 sequentially passes through the polarizer 4, the aperture stop 5, the first condenser lens 6, the first beam splitter 7, and the second condenser lens 8 and then enters the sample cell 9, and the first Another path of light split by the beam splitter 7 enters the first photoelectric receiver 10; the laser receiving system 2 is provided with a third condenser lens 11 and a second photoelectric receiver 12, and the laser emitting system 1 emits The laser light is incident on the air particles in the sample cell 9, and the scattered light of the air particles is condensed into the second photoelectric receiver 12 through the third condenser lens 11. The first photoelectric receiver 10 and the second photoelectric receiver 12 The devices 12 are respectively connected to the back-end processing equipment.
[0024] In order to prevent air particles from entering the optical detection system and polluting the optical lens, the laser emitting system 1 and the laser receiving system 2 are respectively installed in a closed chamber, and a first plane is provided on the side wall of the installation chamber of the laser emitting system 1 The lens 15 is used as a laser emitting window, and a second flat lens 16 is provided on the side wall of the installation chamber of the laser receiving system 2 as a scattered light receiving window. The first flat lens 15 and the second flat lens 16 can ensure the smoothness of the light path while isolating air particles.
[0025] In order to enhance the signal intensity of the scattered light, the angle between the incident light from the second condenser lens 8 entering the sample cell 9 and the third condenser lens 11 to obtain the scattered light from the sample cell 9 is less than or equal to 90°. The angle of incident light and scattered light can be adjusted by adjusting the positions of the laser emitting system 1 and the laser receiving system 2, from figure 1 It can be seen that the angle between incident light and scattered light is 90°.
[0026] In order to facilitate the zero point correction of the system, a second beam splitter 13 and a third photoelectric receiver 14 are provided in the laser receiving system 2, and the second beam splitter 13 is provided between the third condenser lens 11 and the sample cell 9. On the optical path of, the scattered light of the air particles in the sample cell 9 passes through the second beam splitter 13 and then enters the third condenser lens 11 one way, and the other way enters the third photoreceiver 14, the third photoreceiver 14 It is also connected to the back-end processing equipment.
[0027] In the implementation process, the first photoreceiver 10, the second photoreceiver 12, and the third photoreceiver 14 all use photomultiplier tubes, which can convert the received optical signals into electrical signals, and amplify them. The voltage signal is obtained after filtering and filtering, and the air quality can be judged by analyzing the relationship between the voltage signal and the concentration of air particles by using the back-end processing equipment.
[0028] Although the description is made with reference to the embodiments of the present invention, it should be understood that those skilled in the art can design many other modifications and implementations. For example, within the scope of the disclosure of this application, computers, microprocessors, and Other control chips are used as back-end processing devices, other implementations can be selected as photoelectric receivers, and the shape and size of the sample cell can be selected. These modifications and implementations fall within the scope and spirit of the principles disclosed in this application. In addition, this embodiment only describes the installation relationship of the various components of the system in detail, the specific processing algorithm in the back-end processing device is not mentioned, but the relevant technical personnel should understand that the working principle of the present invention It can be implemented on the basis, and the processing algorithm in the back-end processing device can be optimized and improved according to the accuracy requirements of different hardware environments and systems, so it will not be repeated.
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