CN213148673U - Atmospheric particle concentration measurement device based on laser scattering method - Google Patents
Atmospheric particle concentration measurement device based on laser scattering method Download PDFInfo
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- 238000000790 scattering method Methods 0.000 title claims abstract description 21
- 238000005259 measurement Methods 0.000 title claims description 38
- 239000002245 particle Substances 0.000 title abstract description 24
- 238000005070 sampling Methods 0.000 claims abstract description 57
- 238000001514 detection method Methods 0.000 claims abstract description 34
- 239000008277 atmospheric particulate matter Substances 0.000 claims description 16
- 239000013618 particulate matter Substances 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 13
- 238000012544 monitoring process Methods 0.000 abstract description 6
- 238000000034 method Methods 0.000 description 20
- 230000005250 beta ray Effects 0.000 description 9
- 238000004891 communication Methods 0.000 description 4
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- 238000005303 weighing Methods 0.000 description 4
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- 238000006243 chemical reaction Methods 0.000 description 1
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- 238000012423 maintenance Methods 0.000 description 1
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Abstract
本实用新型公开了基于激光散射法的大气颗粒物浓度测量装置，属大气颗粒物浓度监测技术领域，其中，该装置包括颗粒物切割器、激光检测单元和采样泵，所述的颗粒物切割器的进气口经过气道与采样头连通，所述的颗粒物切割器的出气口与采样管连通后接入激光检测单元的进气口，激光检测单元的出气口经过气道与采样泵的进气口连通。该装置不仅体积小，而且便于安装，能够广泛推广和应用，具有实用性。
The utility model discloses an atmospheric particle concentration measuring device based on a laser scattering method, which belongs to the technical field of atmospheric particle concentration monitoring, wherein the device comprises a particle cutter, a laser detection unit and a sampling pump. Connected with the sampling head through the air passage, the air outlet of the particle cutter is connected to the sampling tube and then connected to the air inlet of the laser detection unit, and the air outlet of the laser detection unit is communicated with the air inlet of the sampling pump through the air passage. The device is not only small in size, but also easy to install, can be widely popularized and applied, and has practicability.
Description
Technical Field
The utility model belongs to the technical field of atmospheric particulates concentration monitoring, concretely relates to atmospheric particulates concentration measurement device based on laser scattering method.
Background
At present, the concentration of atmospheric particulates is measured by a weighing method, a beta-ray method, a light scattering method, an oscillation balance method and the like. The weighing method is the most direct method in all atmospheric particulate concentration detection methods, has relatively highest accuracy, but has long sampling time, and can not realize online monitoring because sampling and weighing can not be continuously carried out. The oscillating balance method is a kind of weighing method, and has a periodic error between a measurement result obtained in different seasons and a measurement result obtained in different seasons, which is higher or lower than the measurement result obtained in the different seasons, and is expensive.
The beta-ray method is a measurement method based on radiation detection, and the method judges the mass of the particulate matters in the air by monitoring the attenuation of the strength of the beta-ray passing through the same position of a filter paper belt before and after sampling, and simultaneously accurately measures the air extraction volume so as to obtain the mass concentration of the particulate matters in the monitoring environment at the time interval. The measuring device has higher requirements on the operating environment, and simultaneously, the problem that the measuring result has a negative value exists.
The laser scattering method technology utilizes the scattering of incident laser by the particles in the air flow to measure the content of the particles, the influence of the components of the particles is larger than that of other methods, but the excellent real-time performance and the low operation and maintenance cost of the laser scattering method technology make the laser scattering method become a main measuring device in an atmosphere particle monitoring network with high-density distribution operation.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: the utility model aims to provide an atmospheric particulate matter concentration measuring device based on a laser scattering method, which measures the particulate matter components; the utility model also discloses its measuring method.
The technical scheme is as follows: in order to realize the purpose of the utility model, the utility model adopts the following technical scheme:
atmospheric particulates concentration measurement device based on laser scattering method, including particulate matter cutterbar, laser detecting element and sampling pump, the air inlet of particulate matter cutterbar pass through air flue and sampling head intercommunication, the air outlet of particulate matter cutterbar insert laser detecting element's air inlet after with the sampling pipe intercommunication, laser detecting element's air outlet passes through the air flue and the air inlet intercommunication of sampling pump.
Furthermore, an outlet of the sampling pump is connected to a second-stage filter, and the second-stage filter is connected to the laser detection unit through the air distribution channel.
Furthermore, a filter and a gas flowmeter are sequentially arranged between the laser detection unit and the sampling pump. The gas flow meter and the sampling pump precisely control the flow of the gas flow flowing through the sampling pipe and the measuring chamber to be kept at a constant set value.
Furthermore, the laser detection unit, the filter, the gas flowmeter and the sampling pump are all arranged inside the case.
Furthermore, a wireless routing module is arranged below the case, and an antenna used in cooperation with the wireless routing module is arranged above the case.
Furthermore, a temperature and humidity sensor, a heating unit and a temperature and humidity compensation module are arranged on the sampling pipe.
Furthermore, a laser light source generator, a first focusing lens, a measuring chamber, a light trap, a second focusing lens and a laser detector are arranged in the laser detection unit, the laser light source generator and the laser detector are oppositely arranged at two ends of the measuring chamber, the first focusing lens is arranged on the side close to the laser light source generator, the light trap is arranged right in front of the first focusing lens, and two groups of second focusing lenses are respectively arranged on two sides of the light trap.
Furthermore, a working area between the air outlet of the sampling tube and the air outlet of the laser detection unit is arranged between the first focusing lens and the second focusing lens, the working area is positioned right in front of the optical trap and on a focal plane of the first group of second focusing lenses, and the laser detector is positioned on a focal plane of the second group of second focusing lenses.
Furthermore, the laser detector is connected with an external measuring module.
Has the advantages that: compared with the prior art, the utility model discloses an atmospheric particulates concentration measurement device based on laser scattering method, including particulate matter cutterbar, laser detecting element and sampling pump, the air inlet of particulate matter cutterbar through air flue and sampling head intercommunication, insert laser detecting element's air inlet behind particulate matter cutterbar's the gas outlet and the sampling pipe intercommunication, laser detecting element's gas outlet is through the air inlet intercommunication of air flue and sampling pump, not only small, the installation of being convenient for moreover, can extensively promote and use, has the practicality.
Drawings
FIG. 1 is a front view of an apparatus for on-line measurement of atmospheric particulate matter concentration;
FIG. 2 is a schematic structural diagram of a laser detection unit;
FIG. 3 is a functional block diagram of an apparatus for online measurement of atmospheric particulate matter concentration;
FIG. 4 is a graph of PM10 data measured by an apparatus for online measurement of atmospheric particulate matter concentration, compared with data measured by an apparatus based on a beta-ray method;
FIG. 5 is a graph comparing PM2.5 data measured by an apparatus for online measurement of atmospheric particulate matter concentration with data measured by an apparatus based on a beta-ray method;
reference numerals: the device comprises a sampling head 1, an air passage 2, a particulate matter cutter 3, a sampling pipe 4, a temperature and humidity sensor 5, a heating unit 6, a temperature and humidity compensation module 7, a laser detection unit 8, a filter 9, a gas flow meter 10, a sampling pump 11, a second-stage filter 12, a gas separation passage 13, a chassis 14, a touch screen 15, a wireless routing module 16, an antenna 17, a power supply module 18, a main control panel 19, a laser light source generator 81, a first focusing lens 82, a measurement chamber 83, an optical trap 84, a second focusing lens 85, a laser detector 86 and a measurement module 87.
Detailed Description
The invention will be further elucidated with reference to the drawings and the specific embodiments.
As shown in fig. 1-3, the atmospheric particulate matter concentration measuring device based on the laser scattering method comprises a sampling system, a laser detection system, a PID control heating system, a communication system, a power supply module 18 and a main control panel 19. The sampling system, the laser detection system, the PID control heating system, the communication system and the power supply module 18 are respectively connected with the main control panel 19.
The sampling system comprises a particulate cutter 3, a filter 9, a gas flowmeter 10 and a sampling pump 11, wherein the gas flowmeter 10 is provided with a flow control valve. Wherein, the air inlet of the particulate matter cutter 3 is communicated with the sampling head 1 through the air passage 2. The sample gas to be detected containing particles outside enters the particle cutter 3 through the sampling head 1 and the air passage 2, and the particles are cut by the particle cutter 3 and then are finally sucked to the laser detection unit 8 through the sampling pipe 4 along with the sample gas to be detected. The communication system comprises a touch screen 15 and a wireless routing module 16. Data is uploaded to the internet via the wireless routing module 16 via the antenna 17.
The PID control heating system comprises a temperature and humidity sensor 5, a heating unit 6 and a temperature and humidity compensation module 7. Temperature and humidity sensor 5, heating unit 6, temperature and humidity compensation module 7 are all set up respectively on sampling pipe 4. After the sample gas to be measured enters the sampling pipe 4, the temperature and humidity information of the sample gas is obtained through the temperature and humidity sensor positioned on the pipe wall, when the temperature and humidity of the sample gas exceed a set range, the temperature and humidity compensation module 7 is started, PID control is carried out on the sample gas through the heating unit 6, and the influence of atmospheric temperature and humidity change on particle measurement is compensated precisely.
The PID control heating system is formed by two-stage PID closed loop cascade and comprises a humidity PID control loop and a temperature PID control loop, wherein the humidity PID control loop forms outer loop control, and the temperature PID control loop forms inner loop control. The double closed-loop control of the humidity PID control loop and the temperature PID control loop enhances the stability and the anti-interference capability of the temperature and humidity compensation system. The heating unit 6 is relatively isolated from the external atmospheric environment to reduce the thermal inertia of the temperature and humidity compensation module 7, so that the time constant is reduced, and the response speed of the system to external disturbance is accelerated. The PID controlled heating system is implemented in a combination of hardware and software. The coarse tuning of the PID parameters is set by hardware, and the optimized fine parameters are calculated by software and stored in a memory.
The air inlet of the particulate matter cutter 3 is communicated with the sampling head 1 through the air passage 2, and the air outlet of the particulate matter cutter 3 is communicated with the sampling pipe 4 and then connected into the air inlet of the laser detection unit 8. The gas outlet of the laser detection unit 8 is communicated with the gas inlet of the sampling pump 11 through the gas passage 2, the outlet of the sampling pump 11 is connected to the second-stage filter 12, and the second-stage filter 12 is connected to the laser detection unit 8 through the gas distribution passage 13.
Wherein a filter 9 and a gas flow meter 10 are arranged between the laser detection unit 8 and the sampling pump 11. The laser detection unit 8, the filter 9, the gas flow meter 10 and the sampling pump 11 are all disposed inside the cabinet 14. A main control board 19 and a touch panel 15 are provided on the housing 14.
The power module 18 is disposed at the bottom of the chassis 14. A wireless routing module 16 is disposed below the chassis 14. An antenna 17 is provided above the chassis 14 for use with the wireless routing module 16.
The laser detection system comprises a laser light source generator 81, a first focusing lens 82, a measurement chamber 83, a light trap 84, a second focusing lens 85, a laser detector 86 and an external measurement module 87 which are arranged in the laser detection unit 8, wherein the laser detector 86 is connected with the external measurement module 87. The laser light source generator 81 and the laser detector 86 are oppositely arranged at two ends of the measuring chamber 83, the first focusing lens 82 is arranged at the side close to the laser light source generator 81, the light trap 84 is arranged right in front of the first focusing lens 82, two groups of second focusing lenses 85 are respectively arranged at two sides of the light trap 84, a working area between the air outlet of the sampling tube 4 and the air outlet of the laser detection unit 8 is arranged between the first focusing lens 82 and the second focusing lens 85, the working area is positioned right in front of the light trap 84 and on the focal plane of the first group of second focusing lenses 85, and the laser detector 86 is positioned on the focal plane of the second group of second focusing lenses 85. After being focused by two groups of focusing lenses 85, laser signals scattered by particulate matters are detected by a laser detector 86 and subjected to high-speed ADC (analog to digital converter) conversion to be converted into frequency signals, frequency and amplitude information of the frequency signals are processed by a measuring module 87, the quantity and the quality of the particulate matters with different particle sizes are subjected to high-speed real-time statistical operation, and finally concentration values of PM1, PM2.5, PM4 and PM10 are obtained.
The measuring method of the atmospheric particulate matter concentration measuring device based on the laser scattering method comprises the following steps:
1) the external sample gas to be detected containing particles enters a particle cutter 3 through a sampling head 1 and an air passage 2, the particles are cut by the particle cutter 3 and are finally sucked into a laser detection unit 8 along with the sample gas to be detected through a sampling pipe 4, and the airflow flow in the laser detection unit 8 (namely a measurement chamber 83) is kept constant;
2) after sample gas to be measured enters a sampling pipe 4, temperature and humidity information of the sample gas is obtained through a temperature and humidity sensor 5 positioned on the pipe wall of the sampling pipe 4, when the temperature and humidity of the sample gas exceed a set range, a temperature and humidity compensation module 7 is started, PID control is carried out on the sample gas through a heating unit 6, and the influence of atmospheric temperature and humidity change on particle measurement is compensated;
3) and uploading the detection data in the step 1) to the Internet through a communication system.
The working process is as follows: the sample gas to be detected cut by the particulate matter cutter 3 is sucked into the measurement chamber 83, the laser light source generator 81 generates infrared light with the wavelength of 790 and 860nm, laser light generated by the laser light source generator 81 passes through the first focusing lens 82 to form parallel light beams, the parallel light beams are irradiated to the sample gas to be detected in a working area of the measurement chamber 83 between the air outlet of the sampling tube 4 and the air outlet of the laser detection unit 8, particulate matters in the sample gas to be detected emit and scatter to the parallel light beams, the scattered laser light is finally focused and irradiated to the laser detector 86 through the two groups of second focusing lenses 85 to be used for detecting the infrared light scattered by the particulate matters, and the particle size of the particulate matters is calculated through the measurement module 87. The particle size of the particles is calculated by the measuring module 87, the data is displayed on the touch screen 15 through system software, and the data is uploaded to the internet through the wireless routing module 16 and the antenna 17. If the sample gas to be measured does not contain the particulate matters or the particle size of the particulate matters is very small, the laser generated by the laser light source generator directly irradiates the optical trap 84 through the parallel light beams formed by the first focusing lens 82, and the size of the optical trap 84 is obtained through optimization. After the gas detected by the laser detection unit 8 passes through the filter 9 to filter a part of particulate matters, the gas passes through the gas flowmeter 10 and the sampling pump 11 and then enters the second-stage filter 12 to form pure air which does not contain the particulate matters basically, one part of the pure air enters the measurement chamber 83 through the gas distribution passage 13 and is used for blowing off the particulate matters possibly adsorbed on the inner wall of the measurement chamber 83, and the other part of the pure air is directly discharged out of the box body. The gas flow meter 10 and the sample pump 9 closely control the flow of gas through the sampling tube 4, the measurement chamber 83 and maintain a constant set point.
FIG. 4 is a comparison between the PM10 data measured by the device for online measurement of the concentration of atmospheric particulates and the data measured by the device based on the beta-ray method; (dark color is data measured by the apparatus, and light color is data measured by an apparatus based on the beta-ray method (T640, product of Teledyne, USA)). It can be seen that the data measured by the device is very close to the data measured by the product T640 of Teledyne USA. The correctness and feasibility of the utility model are verified.
FIG. 5 is a comparison between the PM2.5 data measured by the device for online measurement of atmospheric particulate matter concentration according to the present invention and the data measured by the device based on the beta-ray method (T640, product of Teledyne, USA); (dark color is data measured by the device, and light color is data measured by the device based on the beta ray method). It can be seen that the data measured by the device is very close to the data measured by the product T640 of Teledyne USA. The correctness and feasibility of the utility model are verified.
Claims (9)
1. Atmospheric particulates concentration measurement device based on laser scattering method, its characterized in that: including particulate matter cutterbar (3), laser detecting element (8) and sampling pump (11), the air inlet of particulate matter cutterbar (3) through air flue (2) and sampling head (1) intercommunication, the air inlet of inserting laser detecting element (8) behind the gas outlet of particulate matter cutterbar (3) and sampling pipe (4) intercommunication, the gas outlet of laser detecting element (8) is through the air inlet intercommunication of air flue (2) and sampling pump (11).
2. The atmospheric particulate matter concentration measurement device based on the laser scattering method according to claim 1, characterized in that: the outlet of the sampling pump (11) is connected to a second-stage filter (12), and the second-stage filter (12) is connected to the laser detection unit (8) through the gas distribution channel (13).
3. The atmospheric particulate matter concentration measurement device based on the laser scattering method according to claim 1, characterized in that: and a filter (9) and a gas flowmeter (10) are sequentially arranged between the laser detection unit (8) and the sampling pump (11).
4. The atmospheric particulate matter concentration measurement device based on the laser scattering method according to claim 1, characterized in that: the laser detection unit (8), the filter (9), the gas flowmeter (10) and the sampling pump (11) are all arranged inside the case (14).
5. The atmospheric particulate matter concentration measurement device based on the laser scattering method according to claim 4, characterized in that: a wireless routing module (16) is arranged below the case (14), and an antenna (17) used in cooperation with the wireless routing module (16) is arranged above the case (14).
6. The atmospheric particulate matter concentration measurement device based on the laser scattering method according to claim 1, characterized in that: the sampling pipe (4) is provided with a temperature and humidity sensor (5), a heating unit (6) and a temperature and humidity compensation module (7).
7. The atmospheric particulate matter concentration measurement device based on the laser scattering method according to claim 1, characterized in that: the laser detection device is characterized in that a laser light source generator (81), a first focusing lens (82), a measurement chamber (83), a light trap (84), a second focusing lens (85) and a laser detector (86) are arranged in the laser detection unit (8), the laser light source generator (81) and the laser detector (86) are oppositely arranged at two ends of the measurement chamber (83), the first focusing lens (82) is arranged on the side close to the laser light source generator (81), the light trap (84) is arranged right in front of the first focusing lens (82), and two groups of second focusing lenses (85) are respectively arranged on two sides of the light trap (84).
8. The atmospheric particulate matter concentration measurement device based on the laser scattering method according to claim 7, characterized in that: and a working area between the air outlet of the sampling tube (4) and the air outlet of the laser detection unit (8) is arranged between the first focusing lens (82) and the second focusing lens (85), the working area is positioned right in front of the light trap (84) and on the focal plane of the first group of second focusing lenses (85), and the laser detector (86) is positioned on the focal plane of the second group of second focusing lenses (85).
9. The atmospheric particulate matter concentration measurement device based on the laser scattering method according to claim 7 or 8, characterized in that: the laser detector (86) is connected with an external measuring module (87).
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113138210A (en) * | 2021-06-22 | 2021-07-20 | 电子科技大学 | Self-adaptive local Gaussian temperature and humidity compensation method for intelligent gas sensor |
| CN113758842A (en) * | 2021-06-03 | 2021-12-07 | 杭州明瑞智能检测科技有限公司 | Oil smoke particulate matter detection device with heating function and detection method thereof |
| CN113758841A (en) * | 2021-06-03 | 2021-12-07 | 杭州明瑞智能检测科技有限公司 | On-line detector for lampblack particulate matter and its detection method |
| CN114460046A (en) * | 2022-01-27 | 2022-05-10 | 苏州奥特福环境科技有限公司 | On-line extraction type wet particulate matter back scattering detection optical system |
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2020
- 2020-07-22 CN CN202021457134.3U patent/CN213148673U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113758842A (en) * | 2021-06-03 | 2021-12-07 | 杭州明瑞智能检测科技有限公司 | Oil smoke particulate matter detection device with heating function and detection method thereof |
| CN113758841A (en) * | 2021-06-03 | 2021-12-07 | 杭州明瑞智能检测科技有限公司 | On-line detector for lampblack particulate matter and its detection method |
| CN113138210A (en) * | 2021-06-22 | 2021-07-20 | 电子科技大学 | Self-adaptive local Gaussian temperature and humidity compensation method for intelligent gas sensor |
| CN114460046A (en) * | 2022-01-27 | 2022-05-10 | 苏州奥特福环境科技有限公司 | On-line extraction type wet particulate matter back scattering detection optical system |
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Effective date of registration: 20250317 Address after: Room 209, Building 4, Scientific Innovation Park, the Taihu Lake New Town, No. 18, Suzhou River Road, East the Taihu Lake Ecological Tourism Resort, Wujiang District, Suzhou City, Jiangsu Province, 215000-03 Patentee after: Yunchi (Suzhou) Communication Technology Co.,Ltd. Country or region after: China Address before: 210037 a7-103, 199 Mufu East Road, Gulou District, Nanjing City, Jiangsu Province Patentee before: NANJING YIRAN ELECTRONIC TECCHNOLOGY CO.,LTD. Country or region before: China |