CN114577690A - Particulate matter concentration detection device - Google Patents
Particulate matter concentration detection device Download PDFInfo
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- CN114577690A CN114577690A CN202210217963.1A CN202210217963A CN114577690A CN 114577690 A CN114577690 A CN 114577690A CN 202210217963 A CN202210217963 A CN 202210217963A CN 114577690 A CN114577690 A CN 114577690A
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- 238000001514 detection method Methods 0.000 title claims abstract description 20
- 239000013618 particulate matter Substances 0.000 title claims abstract description 17
- 238000009413 insulation Methods 0.000 claims abstract description 13
- 239000013307 optical fiber Substances 0.000 claims description 12
- 230000000694 effects Effects 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- 230000000087 stabilizing effect Effects 0.000 claims description 5
- 238000010521 absorption reaction Methods 0.000 claims 1
- 238000010408 sweeping Methods 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 27
- 239000002245 particle Substances 0.000 abstract description 8
- 238000009423 ventilation Methods 0.000 abstract description 7
- 230000001681 protective effect Effects 0.000 abstract description 6
- 238000009792 diffusion process Methods 0.000 abstract description 3
- 201000009310 astigmatism Diseases 0.000 description 6
- 238000013461 design Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 238000010926 purge Methods 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000000149 argon plasma sintering Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005250 beta ray Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000306 component Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
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- 238000002955 isolation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
- G01N15/0606—Investigating concentration of particle suspensions by collecting particles on a support
- G01N15/0618—Investigating concentration of particle suspensions by collecting particles on a support of the filter type
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
- G01N15/0606—Investigating concentration of particle suspensions by collecting particles on a support
- G01N15/0618—Investigating concentration of particle suspensions by collecting particles on a support of the filter type
- G01N15/0625—Optical scan of the deposits
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Dispersion Chemistry (AREA)
- Optics & Photonics (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a particulate matter concentration detection device, wherein a gas guide bolt is arranged on a measurement cavity and is arranged in the measurement cavity through a gas guide ring, the cylindrical mirror support is internally provided with a cylindrical mirror through the cylindrical mirror pressure ring, the cylindrical mirror is communicated with one end of an incident light channel, one end of an emergent light channel is provided with a light trap, the cylindrical mirror support is provided with a laser support through a plurality of heat insulation columns, a laser is arranged in the laser support, the laser is converged through the cylindrical mirror to form a linear light spot, the measuring cavity is provided with a measuring surface, the measured gas is guided into the measuring surface by the gas guide bolt, meanwhile, the outside is guided into clean protective gas, the gas guide bolt and the ventilation ring are combined to form annular sheath gas, the measured gas is wrapped, diffusion is prevented, and it is ensured that no particles enter the pollution lens and the light trap through the incident light channel and the light trap channel port.
Description
Technical Field
The invention relates to the technical field of particulate matter concentration detection devices, in particular to a particulate matter concentration detection device.
Background
Air particles are multiphase mixed systems composed of solid and liquid particles suspended in air. These fine particles are easy to be carriers and reaction bodies of other pollutants, and many substances which are potentially harmful to human bodies are mainly concentrated on the fine particles, so that the attention of people is increased.
At present, the mainstream smoke dust measuring methods in the market mainly comprise a gravimetric method, a light scattering method, a charge method and a beta-ray method.
When the particle is measured by using the laser method, especially in the fixed pollution source occasion, the related optical lens is easily polluted due to the accumulation of larger water vapor and various corrosive bodies in the measuring gas along with the time, so that the measured data is inaccurate. Meanwhile, in order to solve water vapor interference, the whole measuring module is in a high-temperature environment (120-150 ℃), and no matter the laser or the detector is used, two core components cannot work at a high temperature for a long time, the performance of the laser is greatly influenced by temperature change, and fluctuation and drift of measured data can be caused. Protection of the optics and thermal isolation of the laser and detector are critical. Meanwhile, in order to meet the requirement of ultra-low emission measurement, the requirement on the lower detection limit of the device is relatively high, the traditional design adopts punctiform parallel laser for measurement, the structure of a measuring cell is large, the cavity is internally stray, once the cavity is polluted, the deviation of measured data is large, and the relative stability of the measured data can be ensured only by frequent zero adjustment and calibration.
Disclosure of Invention
The present invention is directed to a device for detecting a concentration of particulate matter, so as to solve the problems mentioned in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a particulate matter concentration detection device, includes and measures the cavity, be equipped with the air guide bolt on measuring the cavity, the air guide bolt is installed in measuring the cavity through ventilating the ring, and compressed air evenly pours into through ventilating eight holes all around of ring, and evenly dispersed compressed air flows out through the gap between air guide bolt and the cylindrical cavity to form an annular air curtain, be equipped with differential pressure module on measuring the cavity, be equipped with cylindrical cavity, incident light passageway and emergent light passageway in measuring the cavity, install the lens support on measuring the cavity, convex lens is installed through the lens clamping ring in the lens support inside, install the cylindrical mirror support on measuring the cavity, the cylindrical mirror is installed through the cylindrical mirror clamping ring in the cylindrical mirror support inside, the cylindrical mirror communicates with the one end of incident light passageway, the one end of emergent light passageway is equipped with the light trap, so that the light trap absorbs the incident light that passes through the incident light passageway, eliminates not totally absorbed and the incident light of reflection returns emergent light passageway, the laser instrument support is installed through a plurality of thermal-insulated posts to the cylindrical mirror support, be equipped with the laser instrument in the laser instrument support, still install the fan through a plurality of thermal-insulated posts on the laser instrument support, be equipped with the air inlet on the measurement cavity.
Furthermore, a cylindrical mirror support pressure ring is arranged in the cylindrical mirror support.
Furthermore, the measuring cavity is respectively connected with a high-precision filter, a pressure stabilizing gas tank and a jet pump through a plurality of pagoda joints.
Furthermore, an optical fiber is installed on the measuring cavity through an optical fiber connector.
Furthermore, a linear diaphragm is arranged inside the cylindrical mirror support.
Furthermore, a heating plate is arranged in the measuring cavity.
Furthermore, a lens heat insulation seat is arranged outside the cylindrical lens support.
Furthermore, a conical chamfer is arranged at the joint of the cylindrical mirror and the measuring cavity, so that airflow forms vortex airflow after entering and flows out of the incident light channel.
Furthermore, a narrow gap is formed between the measurement cavity and the lens support, and clean gas flows through the gap and enters the measurement cavity through the channel to form strong air pressure so as to achieve the effect of purging the lens.
Compared with the prior art, the invention has the beneficial effects that:
1. the device controls the working temperature of the laser within an allowable range through the structural design of the lens heat insulation seat, the heat insulation column and the cooling fan, and simultaneously ensures the constant power output of the laser through the design of a constant power working circuit without influencing the measurement;
2. the device integrates point-shaped parallel lasers into sharp linear light spots through the arrangement of the cylindrical mirror, so that the light spots have a light condensation effect, the highest energy and the largest contact area of the light spots in a sample gas monitoring area are ensured, and the monitoring sensitivity is improved;
3. the device uses the light trap to absorb the incident light passing through the incident light channel, and eliminates the incident light which is not completely absorbed and reflected to return to the emergent light channel;
4. the device is designed by a forward scattering specific angle (such as 20 degrees, 30 degrees and 45 degrees) receiving structure, and the measuring light is connected into a photodiode and converted into an electric signal through a convex lens, a lens support, an optical fiber adjusting seat and a high-temperature-resistant optical fiber bundle. The concentration of the particles is obtained through the analysis and calculation of the electric signal;
5. the device eliminates astigmatism at the edge of a linear light spot through the linear diaphragm, reduces multiple scattering of the astigmatism in a measurement cavity, and influences the accuracy of data measurement;
6. the device is characterized in that a conical flow guide channel is added at the front end of an incident light channel, so that protective gas enters the structure in a rotating airflow mode to form annular gas curtain protection, and then flows into a cylindrical cavity through an emergent light channel;
7. the device directly guides the measured gas to a linear light spot through the arrangement of a sheath gas interface, a gas guide bolt, a ventilation ring and a cylindrical cavity, shortens the walking distance of the measured gas above a measuring pipeline, realizes the walking of the measured gas as soon as the measured gas is detected, simultaneously guides clean protective gas to the outside, combines the gas guide bolt and the ventilation ring (enables clean air to be uniformly injected) to form annular sheath gas, wraps the measured gas, prevents diffusion, and ensures that no particles enter an incident light channel and an optical trap channel port to pollute lenses and an optical trap;
8. the device is added with the air curtain purging structure, so that the relevant lenses are prevented from being polluted, the maintenance amount is reduced, the drift problem of the measurement data of the equipment is avoided, and the service life of the equipment is prolonged.
9. The device is added through the high-performance differential pressure module, so that the accuracy of sampling flow is guaranteed, and the measured data is more accurate.
Drawings
FIG. 1 is a schematic view of the external structure of the measurement chamber of the present invention;
FIG. 2 is a schematic view of the internal structure of the measurement chamber of the present invention;
FIG. 3 is a schematic diagram of the connection of the high-precision filter, the pressure stabilizing gas tank and the jet pump of the present invention;
FIG. 4 is a schematic view of a linear diaphragm mounting structure according to the present invention;
FIG. 5 is a top view of the present invention;
FIG. 6 is a schematic view of the air guide plug mounting structure of the present invention;
fig. 7 is a schematic view of the linear diaphragm structure of the present invention.
In the reference symbols: 1. a measurement cavity; 2. a venting ring; 3. a differential pressure module; 4. a light trap; 5. a lens support; 6. a convex lens; 7. a fan; 8. a heating plate; 9. a lens heat insulation seat; 10. an air inlet; 11. a linear diaphragm; 12. a laser; 13. a cylindrical mirror; 14. a heat insulating column; 15. an optical fiber splice; 16. a cylindrical mirror support; 17. a lens compression ring; 18. a laser mount; 19. a cylindrical mirror pressure ring; 20. a cylindrical mirror support compression ring; 21. a pagoda joint; 22. an optical fiber; 23. a high-precision filter; 24. a surge tank; 25. a jet pump; 26. a cylindrical cavity; 27. an incident light channel; 28. an emergent light channel; 29. conical chamfering; 30. an air guide bolt.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. In which like parts are designated by like reference numerals. It should be noted that as used in the following description, the terms "front," "back," "left," "right," "upper," and "lower" refer to directions in the drawings, and the terms "bottom" and "top," "inner," and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
Referring to fig. 1-7, the present invention provides a technical solution: a particulate matter concentration detection device comprises a measurement cavity 1, an air guide bolt is arranged on the measurement cavity 1, the air guide bolt is arranged in the measurement cavity 1 through a ventilation ring 2, compressed air is uniformly injected through eight holes around the ventilation ring 3, uniformly dispersed compressed air flows out through a gap between the air guide bolt 30 and a cylindrical cavity 6 to form an annular air curtain, a differential pressure module 3 is arranged on the measurement cavity 1, a cylindrical cavity 26, an incident light channel 27 and an emergent light channel 28 are arranged in the measurement cavity 1, a lens support 5 is arranged on the measurement cavity 1, a convex lens 6 is arranged in the lens support 5 through a lens press ring 17, a cylindrical lens support 16 is arranged on the measurement cavity 1, a cylindrical lens 13 is arranged in the cylindrical lens support 16 through a cylindrical lens press ring 19, the cylindrical lens 13 is communicated with one end of the incident light channel 27, and an optical trap 4 is arranged at one end of the emergent light channel 28, so that the light trap 4 absorbs the incident light passing through the incident light channel 27, eliminates the incident light reflected without being completely absorbed and returns to the emergent light channel 28, the cylindrical mirror support 16 is provided with a laser support 18 through a plurality of heat insulation columns 14, a laser 12 is arranged in the laser support 18, a fan 7 is further arranged on the laser support 18 through a plurality of heat insulation columns 14, and the measuring cavity 1 is provided with an air inlet 10.
A cylindrical mirror support press ring 20 is further provided inside the cylindrical mirror support 16.
The high-precision filter 23, the pressure stabilizing gas tank 24 and the jet pump 25 are connected to the measuring cavity 1 through the pagoda connectors 21 respectively, the pressure stabilizing gas tank 24 plays a role in gas source buffering, the stability of the airflow of the protective gas is ensured, the jet pump 25 provides a negative pressure suction source for the measuring device, and the jet pump 25 has the advantages of low gas consumption and large gas extraction flow.
An optical fiber 22 is mounted on the measurement cavity 1 through an optical fiber connector 15.
The cylindrical mirror support 16 is internally provided with a linear diaphragm 11, and the linear diaphragm 11 is used for eliminating astigmatism at the edge of a linear light spot, so that multiple scattering of the astigmatism in the measurement cavity 1 is reduced, and the accuracy of data measurement is influenced.
The measuring cavity 1 is also internally provided with a heating sheet 8 for heating the inside of the measuring cavity 1.
The outside of the cylindrical lens support 16 is provided with a lens heat insulation seat 9 for heat insulation.
The junction of the cylindrical mirror 13 and the measurement cavity 1 is provided with a tapered chamfer 29, so that the airflow forms a vortex airflow after entering, and flows out from the incident light channel 27.
A narrow gap is formed between the measuring cavity 1 and the lens support 5, and clean gas flows through the gap and enters the measuring cavity 1 through the channel to form strong air pressure so as to achieve the effect of purging the lens.
The working principle is as follows: during operation, the device controls the working temperature of the laser 12 within an allowable range through the structural design of the lens heat insulation seat 9, the heat insulation column 14 and the heat radiation fan 7, simultaneously ensures the constant power output of the laser 12 through the design of a constant power working circuit, does not influence the measurement, integrates point-like parallel lasers into sharp linear light spots through the arrangement of the cylindrical mirror 13, plays a role of light condensation, ensures that the light spot energy of a sample gas monitoring area is the highest and the contact area is the largest, improves the monitoring sensitivity, utilizes the light trap 4 to absorb incident light passing through the incident light channel 27, eliminates the incident light which is not completely absorbed and reflected to return to the emergent light channel 28, adopts the structural design of forward scattering specific angles (such as 20 degrees, 30 degrees and 45 degrees), and accesses the measuring light into a photodiode through the convex lens 6, the lens support 5, the optical fiber connector 15 and a high-temperature resistant optical fiber bundle to convert the measuring light into an electric signal, the device obtains the concentration of particulate matters by analyzing and calculating an electric signal, eliminates astigmatism at the edge of a linear light spot through a linear diaphragm 11, reduces multiple scattering of the astigmatism in a measuring cavity 1, and influences the accuracy of data measurement, and enables protective gas to enter the structure in a rotating airflow mode through the front end of an incident light channel 27 to form annular air curtain protection and then flow into a cylindrical cavity 26 through an emergent light channel 28, and directly guides the measured gas onto the linear light spot through the arrangement of a sheath gas interface, a gas guide plug, a ventilation ring 2 and the cylindrical cavity 26, so that the distance of the measured gas walking above a measuring pipeline is shortened, the measured gas can be conveniently measured and conveniently moved, meanwhile, clean protective gas is guided into the outside, and annular sheath gas is formed by combining the gas guide plug and the ventilation ring (enabling clean air to be uniformly injected), the measuring gas is wrapped to prevent diffusion, no particles enter a pollution lens and a light trap 4 from an incident light channel 27 and a light trap channel port, the detection cavity adopts a cylindrical structure, compared with other detection cavities, the cavity has simple structure and small volume, can play good dustproof and detection effects by matching with an air guide bolt, can reduce the accumulation of particles by spraying a dustproof coating inside,
the jet pump 25 is utilized to provide a negative pressure suction source for the measuring device, the jet pump 25 has the advantages of low air consumption and large air extraction flow, the laser support 18 is made of heat insulation materials, the heat insulation effect is achieved, and the ambient temperature of the laser is not too high.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A particulate matter concentration detection device characterized in that: including measuring cavity (1), be equipped with air guide bolt (30) on measuring cavity (1), air guide bolt (30) are installed in measuring cavity (1) through ventilating ring (2), and compressed air evenly injects through eight holes all around of ventilating ring (3), and evenly dispersed's compressed air flows through the gap between air guide bolt (30) and cylindricality cavity (6) to form an annular air curtain, be equipped with differential pressure module (3) on measuring cavity (1), be equipped with cylindricality cavity (26), incident light passageway (27) and emergent light passageway (28) in measuring cavity (1), install lens support (5) on measuring cavity (1), convex lens (6) are installed through lens clamping ring (17) to lens support (5) inside, install cylindrical mirror support (16) on measuring cavity (1), cylindrical mirror (13) are installed through cylindrical mirror clamping ring (19) to cylindrical mirror support (16) inside, the one end intercommunication of cylindrical mirror (13) and incident light passageway (27), the one end of emergent light passageway (28) is equipped with light trap (4) to make light trap (4) absorb the incident light of passing incident light passageway (27), eliminate not by the complete absorption and the incident light of reflection returns emergent light passageway (28), laser instrument support (18) are installed through a plurality of heat insulating columns (14) in cylindrical mirror support (16), be equipped with laser instrument (12) in laser instrument support (18), still install fan (7) through a plurality of heat insulating columns (14) on laser instrument support (18), be equipped with air inlet (10) on measuring cavity (1).
2. The particulate matter concentration detection apparatus according to claim 1, characterized in that: and a cylindrical mirror support pressure ring (20) is also arranged in the cylindrical mirror support (16).
3. The particulate matter concentration detection apparatus according to claim 2, characterized in that: the measuring cavity (1) is respectively connected with a high-precision filter (23), a pressure stabilizing gas tank (24) and a jet pump (25) through a plurality of pagoda joints (21).
4. The particulate matter concentration detection apparatus according to claim 3, characterized in that: and the measuring cavity (1) is provided with an optical fiber (22) through an optical fiber connector (15).
5. The particulate matter concentration detection apparatus according to claim 4, characterized in that: the cylindrical mirror support (16) is internally provided with a linear diaphragm (11).
6. The particulate matter concentration detection apparatus according to claim 6, characterized in that: and a heating sheet (8) is also arranged in the measuring cavity (1).
7. The particulate matter concentration detection apparatus according to claim 6, characterized in that: and a lens heat insulation seat (9) is arranged outside the cylindrical lens support (16).
8. The particulate matter concentration detection apparatus according to claim 7, characterized in that: a conical chamfer (29) is arranged at the joint of the cylindrical mirror (13) and the measuring cavity (1) so that airflow forms vortex airflow after entering and flows out of the incident light channel (27).
9. The particulate matter concentration detection apparatus according to claim 8, characterized in that: the measuring cavity (1) and the lens support (5) form a narrow gap, clean gas flows through the gap and enters the measuring cavity (1) through the channel to form stronger air pressure, so that the lens sweeping effect is achieved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210217963.1A CN114577690A (en) | 2022-03-08 | 2022-03-08 | Particulate matter concentration detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210217963.1A CN114577690A (en) | 2022-03-08 | 2022-03-08 | Particulate matter concentration detection device |
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| CN202210217963.1A Pending CN114577690A (en) | 2022-03-08 | 2022-03-08 | Particulate matter concentration detection device |
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| CN215297070U (en) * | 2021-04-13 | 2021-12-24 | 苏州科准测控有限公司 | Photometer for filter material filtering efficiency tester |
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