CN110220828B - A particle monitor - Google Patents
A particle monitor Download PDFInfo
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- CN110220828B CN110220828B CN201910556074.6A CN201910556074A CN110220828B CN 110220828 B CN110220828 B CN 110220828B CN 201910556074 A CN201910556074 A CN 201910556074A CN 110220828 B CN110220828 B CN 110220828B
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- mounting seat
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- 239000002245 particle Substances 0.000 title claims abstract description 24
- 238000005259 measurement Methods 0.000 claims abstract description 19
- 230000000903 blocking effect Effects 0.000 claims abstract description 16
- 239000013618 particulate matter Substances 0.000 claims abstract description 14
- 239000000523 sample Substances 0.000 claims description 29
- 230000003287 optical effect Effects 0.000 claims description 15
- 238000010926 purge Methods 0.000 claims description 10
- 239000013307 optical fiber Substances 0.000 claims description 7
- 238000007664 blowing Methods 0.000 claims 1
- 238000010408 sweeping Methods 0.000 claims 1
- 238000004092 self-diagnosis Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 14
- 239000000428 dust Substances 0.000 description 4
- 238000011109 contamination Methods 0.000 description 3
- 238000002834 transmittance Methods 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Abstract
The invention discloses a particulate matter monitor. The particle monitor comprises a light source module, a light splitting module, a light blocking mechanism, a scattering structure, a light receiving module, a detector and a light receiving module, wherein the light source module generates light, the light splitting module divides the light emitted by the light source module into calibration light and measurement light, the light blocking mechanism shields the calibration light or the measurement light, the light emitted by the light splitting module sequentially passes through a window sheet, a first diaphragm and a second diaphragm of the scattering structure, the light receiving module receives the light emitted by the scattering structure, and the detector determines light energy received by the light receiving module. The particulate matter monitor has a pollution self-diagnosis function.
Description
Technical Field
The invention belongs to the field of environmental monitoring, and particularly relates to a particulate matter monitor.
Background
With the stricter environmental laws and regulations and the progress and development of dust removal technology, the emission concentration of the organized pollution source particles is lower and lower. There are many new coal-fired boilers on line, the average concentration of the particle emission concentration is even lower than 3mg/m 3, and the coal-fired boiler has the characteristics of high temperature and high humidity. This puts higher demands on detection limits, sensitivity, repeatability, suppression of stray light, etc. of the instrument.
Because the fume discharged by the equipment has the characteristics of high temperature and high humidity, water mist is easy to form on the lenses, and dust is adsorbed. When dust and water mist are attached to the lenses, the transmittance of the lenses can be reduced, and the normal operation of the instrument is affected. Current instruments only measure flue gas particulate and do not have the function of periodically testing the optical system for contamination levels, particularly the function of evaluating the contamination levels of the optical elements in the particulate measurement chamber.
Disclosure of Invention
In order to solve the problems, the invention provides a particulate matter monitor, which is provided with a self-diagnosis function of the light path pollution degree, and realizes the measurement of the light path pollution value.
The invention provides a particle monitor which comprises a light source module, a light splitting module, a light blocking mechanism, a scattering structure, a light receiving module and a detector, wherein the light source module generates light, the light splitting module divides the light emitted by the light source module into calibration light and measurement light, the light blocking mechanism shields the calibration light or the measurement light, the light emitted by the light splitting module sequentially passes through a window sheet, a first diaphragm and a second diaphragm of the scattering structure, the light receiving module receives the light emitted by the scattering structure, and the detector determines the light energy received by the light receiving module.
As an alternative scheme of the invention, the particle monitor further comprises a shell, wherein the shell is of a cavity structure, the light source module, the light splitting module and the light blocking mechanism are positioned in the cavity of the shell, the scattering structure is fixed on the shell, and the light receiving module is connected with the scattering structure.
As an alternative scheme of the invention, the scattering structure comprises a tubular probe rod, wherein a window sheet mounting seat provided with a window sheet, a first diaphragm mounting seat provided with a first diaphragm, a second diaphragm mounting seat provided with a second diaphragm and a light receiving module mounting seat are sequentially arranged from one end to the other end of the probe rod, a light passing hole is formed in the light receiving module mounting seat, the light passing hole of the light receiving module mounting seat is opposite to the light inlet hole of the light receiving module.
As an alternative scheme of the invention, the particle monitor further comprises a light trap cover, wherein the light trap cover comprises a cover body and a light trap module, the light trap module is positioned on the inner side wall of the cover body, the cover body and the light receiving module mounting seat form a closed cavity, the light receiving module is positioned in the cavity, and the light trap module absorbs unscattered light in the measured light.
As an alternative scheme of the invention, the optical trap module comprises a convex spherical part with an inclined end part and a trap barrel with internal threads, wherein the convex spherical part is positioned in the trap barrel.
As an alternative scheme of the invention, the convex spherical surface piece and the trap barrel are both subjected to blackening treatment.
As an alternative scheme of the invention, the particle monitor further comprises a flange, wherein the flange is cylindrical and is fixed at the bottom of the shell, the scattering structure penetrates through the flange, the outer wall of the second diaphragm mounting seat is matched with the inner wall of the flange, and the side wall of the flange is provided with an air inlet.
As an alternative scheme of the invention, the probe rod of the scattering structure is provided with an air inlet, and the air inlet of the probe rod is communicated with the air inlet of the flange.
As an alternative scheme of the invention, the side wall of the flange is provided with an observation port.
As an alternative to the invention, the detector is located within the cavity of the housing.
The particle monitor divides the light emitted by the light source module into the calibration light and the measurement light, and the measurement light irradiates particles to scatter through the pollution degree of the calibration light detection light path, and the light receiving module receives the scattered light of the measurement light, so that the particle monitor can be used for calculating the concentration of the particles.
Drawings
Fig. 1 is a schematic diagram of a particulate matter monitor of the present invention.
Fig. 2 is a schematic structural view of the particulate monitor of the present invention.
Fig. 3 is a schematic view of a light source module according to the present invention.
Fig. 4 is a schematic view of a spectroscopic module according to the present invention.
Fig. 5 is a schematic view of the light blocking mechanism of the present invention.
Fig. 6 is a schematic view of a scattering structure according to the invention.
Fig. 7 is a schematic diagram of a light receiving module according to the present invention.
Fig. 8 is a schematic view of a well cap of the present invention.
Fig. 9 is a schematic view of a flange of the present invention.
FIG. 10 is a schematic view of the purge gas circuit of the present invention.
FIG. 11 is a schematic view of a sample port according to the present invention.
Detailed Description
The following detailed description of specific embodiments of the invention is provided in connection with the accompanying drawings and examples in order to provide a better understanding of the invention and its various aspects and advantages. However, the following description of specific embodiments and examples is for illustrative purposes only and is not intended to be limiting of the invention.
The term "coupled" as used herein is to be interpreted broadly, unless explicitly stated or limited otherwise, as the term "coupled" as used herein, as defined in the context of the present invention, as defined in the claims, and as the term "coupled" as used herein, as defined in the claims. In the description of the present invention, it should be understood that the directions or positional relationships indicated by "upper", "lower", "front", "rear", "left", "right", "top", "bottom", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
As shown in fig. 1 and 2, the particle monitor according to the embodiment of the present invention divides the light generated by the light source into a calibration light and a measurement light. When self-checking or calibration is carried out, the measuring light is blocked, only the calibration light is emitted, and the transmissivity of the light path or the linearity of the instrument can be measured according to the energy of the calibration light received by the detector. When the sample gas is measured, the calibration light is shielded, only the measurement light is emitted, particles in the sample gas are scattered when the measurement light irradiates, and the detector determines the energy of the scattered light. The energy ratio of the scattered light to the collimated light is positively correlated with the concentration of particulate matter.
The particle monitor comprises a light source module 100, a light splitting module 200, a light blocking mechanism 300, a scattering structure 400, a light receiving module 500 and a detector 600.
As shown in fig. 3, the light source module 100 is used for generating parallel light rays. The light source module 100 includes a laser board 101, and the laser board 101 is a circuit board of the light source module. The laser diode 102 is mounted on the laser board 101 through the mount 103, and the laser diode 102 emits light after being energized. The collimator lens 104 is disposed below the laser diode 102 through the mounting tube 105, and light emitted by the laser diode 102 passes through the collimator lens 104 to form a parallel beam for emission.
As shown in fig. 4, the light splitting module 200 includes a light splitting prism mounting plate 201, and the light splitting prism mounting plate 201 may be made of stainless steel, so as to be convenient for installation and fixation. The prism 202 is mounted on a prism mounting plate 201. The light emitted from the light source module 100 is split into two parallel beams by the beam splitter prism 202, one beam is used as a calibration beam, and the other beam is used as a measurement beam.
The beam splitter prism mounting plate 201 is provided with a plurality of studs 203, and elastic members (not shown in the figure, such as springs) are sleeved on the studs 203. A nut 204 is mounted on the stud 203. Alternatively, the laser plate 101 is sleeved on the stud 203, the elastic member plays a supporting role on the laser plate 101, and the nut 204 is pressed on the laser plate 101. The adjusting nut 204 can adjust the angle of the light emitted from the light source module 100.
As shown in fig. 5, the light blocking mechanism 300 is fixed to the prism mounting plate 201. The light blocking mechanism 300 includes an electromagnet 301, an iron core of the electromagnet 301 serves as a swing arm 302, and a light blocking plate 303 is mounted on the swing arm 302. A permanent magnet (not shown in the figure) is arranged below the electromagnet 301, when the electromagnet 301 is not electrified, the permanent magnet attracts the swing arm 302 to swing to the lower side, after the electromagnet 301 is electrified, the magnetism of the swing arm 302 is the same as that of the permanent magnet, and the repulsive force of the same magnetic pole enables the swing arm 302 to swing to the upper side. The swing of the swing arm 302 drives the light barrier 303 to move, and the light barrier 303 can block the calibration light or the measurement light, so that only one beam of light is emitted from the light splitting module 200.
The light emitted by the light splitting module 200 irradiates on the scattering structure 400, and the scattering structure 400 is provided with a window sheet, a first diaphragm and a second diaphragm, and the light emitted by the light splitting module 200 passes through the window sheet, the first diaphragm and the second diaphragm at one time and then emits out of the scattering structure 400.
As shown in fig. 6, the scattering structure 400 of the present embodiment includes a probe 401, where the probe 401 is a main body of the scattering structure 400, is a tubular structure, and has a through hole inside. The top end of the probe 401 is provided with a fixing plate 402 for fixing the scattering structure 400. The fixed plate 402 is provided with a window sheet mounting seat 403, and the window sheet 407 is mounted on the window sheet mounting seat 403. The window mount 403 is disposed parallel to the probe 401. The window 407 can protect the light source module 100 and the light splitting module 200. Below the window mount 403 is a first diaphragm mount 404, and a first diaphragm 408 is mounted on the first diaphragm mount 404. Below the first diaphragm mount 404 is a second diaphragm mount 405, and a second diaphragm 409 is mounted on the second diaphragm mount 405. The bottom of the probe 401 is a light receiving module mounting seat 406. The light receiving module mounting seat 406 is provided with a light passing hole 410, the light passing hole 410 is opposite to the second diaphragm 409, and the light emitted by the second diaphragm 409 passes through the light passing hole 410. The first diaphragm 408 and the second diaphragm 409 function to eliminate stray light.
The light receiving module 500 is mounted on the light receiving module mounting 406, and the light emitted by the scattering structure 400 is received by the light receiving module 500.
As shown in fig. 7, the light receiving module 500 of the present embodiment includes a lens base 501, a plano-convex lens 502 is disposed at a light entrance hole at the top end of the lens base 501, and the light entrance hole of the light receiving module 500 is opposite to the light entrance hole 410 of the light receiving module mounting base, so that the light emitted by the scattering structure 400 is incident into the light receiving module 500.
A mirror 504 is fixed to a side wall of the mirror holder 501 by a mirror presser 503. The collimated light enters the light receiving module 500 after passing through the scattering structure 400, and enters an optical fiber connected to the light receiving module 500 after passing through the plano-convex lens 502 and the reflecting mirror 504.
After passing through the scattering structure 400, the scattered light enters the light receiving module 500, and the scattered light enters an optical fiber connected with the light receiving module 500 after passing through the plano-convex lens 502.
The lens holder 501 is connected with an adapter plate 505, and the adapter plate 505 is used for being fixed with the light receiving module mounting base 406.
The detector 600 is connected to the light receiving module 500 through an optical fiber, and the detector 600 determines the energy of the light received by the light receiving module 500.
When the particle monitor of the present embodiment performs calibration, the measuring light is blocked by the light blocking mechanism 300, and only the calibration light is emitted from the spectroscopic module 200. The collimated light passes through the window 407, the first diaphragm 408, the second diaphragm 409, the light hole 410, the plano-convex lens 502, and the mirror 504 on the scattering structure, reaches the end face of the optical fiber, and the optical fiber guides the light energy into the detector 600. The detector 600 determines the energy of the received collimated light to be E1.
E1 is gradually lowered by the aging of the device and contamination of the lens. Taking the initial value of E1 as E0, namely calibrating the energy of light to be E0 when the particle monitor is pollution-free and aging-free. The cleanliness of the light path can be measured through the transmittance:
When the pollution degree of the optical element of the particle monitor exceeds a certain limit value, the transmittance is reduced to a preset value (such as lower than 0.7), and the particle monitor can send out early warning to remind workers. The particulate matter monitor of this embodiment has the light path pollution self-diagnosis function.
When the particle monitor detects the sample gas, the calibration light is blocked by the light blocking mechanism 300, and only the measurement light is emitted from the light splitting module 200. The measuring light is scattered by particles in the sample gas after passing through the window 407, the first diaphragm 408 and the second diaphragm 409 on the scattering structure. The scattered light passes through plano-convex lens 502 to the end face of the fiber where it is directed into detector 600. The detector 600 determines the energy of the received scattered light as E2.
The ratio of the energy of the scattered light to the energy of the calibration light E1 is positively related to the concentration of the particulate matter, and the concentration value of the particulate matter can be obtained by calibrating the ratio by using a standard method.
Because the energy intensity of the calibration light already contains the influence of the light path pollution, the particle concentration obtained by the particle monitor of the embodiment eliminates the influence of the light path pollution.
Optionally, as shown in fig. 2, the particulate monitor further includes a housing 800, where the housing 800 is of a cavity structure and may be made of aluminum. The light source module 100, the light splitting module 200 and the light blocking mechanism 300 are all located in the cavity of the housing 800. The fixing plate 402 of the scattering structure is fixed in the cavity of the housing 800 by the fixing plate 801, and the other part of the scattering structure 400 extends out of the housing 800.
As shown in fig. 2 and 8, the particulate monitor further includes a light trap cover 700. The optical trap mask 700 includes a mask body 701 and an optical trap module. The cover 701 and the light receiving module mounting base 406 form a closed cavity, and the light receiving module 500 is located in the cavity. The optical trap module is located on the inner side wall of the cover 701, and absorbs the light which is not scattered in the measurement light, so as to avoid scattering of the light in the cavity of the cover 701 and cause interference to the performance of the instrument. The cover 701 protects the light receiving module 500 and the optical trap module.
The optical trap module includes a convex spherical member 702 and a trap barrel 703. The well 703 is cylindrical, and the spherical convex member 702 is located in the well 703. The end surface of the convex spherical surface member 702 is a convex spherical surface, and the convex spherical surface can reflect light rays to the well 703. The light trap module can annihilate light rays, and influence of unscattered light rays on monitoring results is avoided.
Optionally, the convex spherical element 702 and the well 703 are made of aluminum, and are blackened, so as to be beneficial to annihilation of light.
As shown in fig. 9, the particulate monitor also includes a flange 900. Flange 900 is secured to the bottom of housing 800. The flange 900 includes a body 901, the body 901 is cylindrical, the scattering structure 400 passes through the flange 900, and the outer wall of the second diaphragm mount 405 is matched with the inner wall of the flange 900. The body 901, the second diaphragm mount 405 and the fixing plate 402 of the scattering structure constitute a closed space.
An air inlet 902 is provided on the side wall of the flange, the air inlet 902 being connected to a source of clean air (zero air) via a connector 903. Clean air is introduced into the cavity of the flange 900 to purge the optical devices in the flange, thereby avoiding the optical devices from being polluted.
The air inlet 411 is arranged on the probe rod of the scattering structure, the air inlet 411 of the probe rod is communicated with the air inlet 902 of the flange, clean air can enter the probe rod 401, and the cavity of the optical trap cover 700 is entered through the probe rod 401 to purge the light receiving module 500.
As shown in fig. 10, after the purge gas enters through the gas inlet 902, the purge gas in one path purges the window 407, the first diaphragm 408 and the second diaphragm 409, and flows out through the light outlet of the second diaphragm 409. The other path enters the cavity of the optical trap cover 700 through the air inlet 411 of the probe rod and flows out through the light through hole 410 arranged on the light receiving module mounting seat 406.
As shown in fig. 9, a viewing port 904 is provided in the sidewall of the flange. The observation port 904 is opposite to the window 407, so that the window 407 can be observed whether dust falls on the window 407 or not through the observation port 904, and the window 407 can be cleaned in time. A detachable sealing cover 905 is arranged at the observation port 904, and the sealing cover 905 is arranged to facilitate cleaning in the observation port 904. The connection portion 906 is for a fixed connection with the housing 800.
Optionally, the detector 600 is located within a cavity of the housing 800, and optical fibers connecting the light receiving module 500 and the detector 600 pass through the probe 401.
As shown in fig. 11, the position of the sample gas port is a, and the sample gas (the gas to be measured) is introduced from the sample gas port during measurement, and the clean gas is introduced from the sample gas port during calibration.
It should be noted that the above embodiments described above with reference to the drawings are only for illustrating the present invention and not for limiting the scope of the present invention, and it should be understood by those skilled in the art that modifications or equivalent substitutions to the present invention are intended to be included in the scope of the present invention without departing from the spirit and scope of the present invention. Furthermore, unless the context indicates otherwise, words occurring in the singular form include the plural form and vice versa. In addition, unless specifically stated, all or a portion of any embodiment may be used in combination with all or a portion of any other embodiment.
Claims (6)
1. A particulate matter monitor, comprising:
the light source module generates light rays;
The light splitting module is used for splitting the light emitted by the light source module into calibration light and measurement light;
The light blocking mechanism is used for blocking the calibration light or the measurement light so that only one beam of light is emitted by the light splitting module;
the light emitted by the light splitting module sequentially passes through a window sheet, a first diaphragm and a second diaphragm of the scattering structure;
the light receiving module is used for receiving the light rays emitted by the scattering structure;
the detector is connected with the light receiving module through an optical fiber and is used for determining the light energy received by the light receiving module;
the flange is provided with an air inlet on the side wall, and the air introduced by the air inlet is used for blowing and sweeping at least the light receiving module;
The light source module, the light splitting module and the light blocking mechanism are positioned in the cavity of the shell, the scattering structure is fixed on the shell, and the light receiving module is connected with the scattering structure;
The scattering structure comprises a tubular probe rod, wherein a window sheet mounting seat, a first diaphragm mounting seat, a second diaphragm mounting seat and a light receiving module mounting seat are sequentially arranged from one end to the other end of the probe rod, the window sheet mounting seat is provided with a window sheet, the first diaphragm mounting seat is provided with a first diaphragm, the second diaphragm mounting seat is provided with a second diaphragm, the light receiving module mounting seat is provided with a light through hole, the light receiving module is connected with the light receiving module mounting seat, and the light through hole of the light receiving module mounting seat is opposite to the light inlet hole of the light receiving module;
The particle monitor also comprises a light trap cover, wherein the light trap cover comprises a cover body and a light trap module, and the light trap module is positioned on the inner side wall of the cover body; the cover body and the light receiving module mounting seat form a closed cavity, and the light receiving module is positioned in the cavity;
An air inlet is formed in the probe rod of the scattering structure, and the air inlet of the probe rod is communicated with the air inlet of the flange;
after the purge gas enters from the air inlet of the flange, one path of purge gas purges the window sheet, the first diaphragm and the second diaphragm and flows out from the light outlet hole of the second diaphragm, and the other path of purge gas enters into the cavity of the optical trap cover through the air inlet of the probe rod and flows out from the light through hole on the light receiving module mounting seat.
2. The particulate matter monitor of claim 1, wherein the optical trap module includes a convex spherical member with an inclined end and a trap barrel with internal threads, the convex spherical member being located within the trap barrel.
3. The particulate matter monitor of claim 2, wherein the convex spherical member and the trap are both blackened.
4. The particulate monitor of claim 1, wherein the flange is cylindrical and is fixed to the bottom of the housing;
The scattering structure passes through the flange, and the outer wall of the second diaphragm mounting seat is matched with the inner wall of the flange.
5. The particulate monitor of claim 4, wherein the flange has a viewing port on a side wall thereof.
6. The particulate matter monitor of claim 1, wherein the detector is located within a cavity of the housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910556074.6A CN110220828B (en) | 2019-06-25 | A particle monitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910556074.6A CN110220828B (en) | 2019-06-25 | A particle monitor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110220828A CN110220828A (en) | 2019-09-10 |
| CN110220828B true CN110220828B (en) | 2025-02-25 |
Family
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105865997A (en) * | 2016-06-07 | 2016-08-17 | 中国科学院合肥物质科学研究院 | Atmospheric raise dust concentration measuring device and method based on forward scattering principle |
| CN109357982A (en) * | 2018-11-13 | 2019-02-19 | 重庆川仪分析仪器有限公司 | Dust instrument self-checking device |
| CN210221767U (en) * | 2019-06-25 | 2020-03-31 | 北京雪迪龙科技股份有限公司 | Particulate matter monitor |
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105865997A (en) * | 2016-06-07 | 2016-08-17 | 中国科学院合肥物质科学研究院 | Atmospheric raise dust concentration measuring device and method based on forward scattering principle |
| CN109357982A (en) * | 2018-11-13 | 2019-02-19 | 重庆川仪分析仪器有限公司 | Dust instrument self-checking device |
| CN210221767U (en) * | 2019-06-25 | 2020-03-31 | 北京雪迪龙科技股份有限公司 | Particulate matter monitor |
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