CN111665173A - Forward scattering type dust concentration measuring instrument - Google Patents
Forward scattering type dust concentration measuring instrument Download PDFInfo
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- CN111665173A CN111665173A CN202010643638.2A CN202010643638A CN111665173A CN 111665173 A CN111665173 A CN 111665173A CN 202010643638 A CN202010643638 A CN 202010643638A CN 111665173 A CN111665173 A CN 111665173A
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- 239000000428 dust Substances 0.000 title claims abstract description 69
- 238000001514 detection method Methods 0.000 claims abstract description 43
- 238000005259 measurement Methods 0.000 claims abstract description 21
- 230000003287 optical effect Effects 0.000 claims description 17
- 238000009434 installation Methods 0.000 claims description 9
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 239000000523 sample Substances 0.000 claims description 4
- 230000035945 sensitivity Effects 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 18
- 230000001681 protective effect Effects 0.000 description 13
- 239000002245 particle Substances 0.000 description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 238000000149 argon plasma sintering Methods 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000000779 smoke Substances 0.000 description 4
- 238000012937 correction Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000012717 electrostatic precipitator Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 210000004907 gland Anatomy 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 238000000790 scattering method 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
- G01N15/02—Investigating particle size or size distribution
- G01N15/0205—Investigating particle size or size distribution by optical means
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- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention provides a forward scattering type dust concentration measuring instrument, which comprises an electric box, a detection rod and an end cover, wherein one end of the detection rod is provided with a C-shaped notch, and a dust measuring area is formed in the center of the C-shaped notch; a first end face of the C-shaped notch is provided with a laser emergent hole, a second end face of the C-shaped notch is provided with a scattering light hole and a reference light hole, and a third end face of the C-shaped notch is provided with a threading through hole; a laser mounting seat is arranged in the cavity of the detection rod, and a laser diode is vertically arranged in the laser mounting seat; a detector mounting seat is arranged in the outer cavity, the first photodiode is mounted in the center of the detector mounting seat, and the second photodiode is mounted on one side of the first photodiode. The invention adopts a double-light-path detection form of scattered light measurement and range light measurement, can automatically correct measurement errors caused by laser diode emission power fluctuation, circuit drift, laser lens pollution and the like, and has high detection sensitivity and good stability.
Description
Technical Field
The invention belongs to the technical field of dust measurement, and particularly relates to a forward scattering type dust concentration measuring instrument.
Background
The conventional dust concentration measuring instrument mostly adopts a laser back scattering method measuring principle, uses infrared laser as an emitting light source, and generates light scattering when laser irradiates on dust. Under the condition that the optical system and the dust properties are certain, the scattered light intensity is proportional to the dust concentration, and then the measurement is completed after calculation.
Industrial fume emission mostly adopts electrostatic precipitator to collect industrial dust, but traditional electrostatic precipitator export dust emission concentration is generally greater than 50mg/m3, and the dust particle diameter is great, generally all is more than 10um, and it is easier to adopt the back reflection laser dust measurement.
Along with the improvement of the national requirements for flue gas emission, the traditional electrostatic dust collector technology is generally upgraded and improved in China, a dust collector combining electric dust collection and cloth bag dust collection is provided, and the prior dust collection technologies such as wet-process electric dust collection are provided, so that the dust emission concentration at the outlet of the dust collector is further reduced, and the particle size of dust particles is further reduced. At present, the emission requirement of flue gas of a large thermal power plant in China is below 10mg/m3, the ultra-low emission requirement is below 5mg/m3, the opportunities of laser reflection and refraction are reduced greatly, and the measurement precision cannot meet the field requirement due to the low sensitivity of a back scattering laser method.
Disclosure of Invention
The invention aims to provide a forward scattering type dust concentration measuring instrument, which adopts a double-light-path detection mode of scattered light measurement and range light measurement, can automatically correct measurement errors caused by laser diode emission power fluctuation, circuit drift, laser lens pollution and the like, and has high detection sensitivity and good stability.
The technical solution for realizing the purpose of the invention is as follows:
a forward scattering type dust concentration measuring instrument comprises an electric box, a detection rod and an end cover, wherein the electric box is arranged outside one end of the detection rod, and the end cover is arranged outside the other end of the detection rod and forms an outer cavity; the electrical box is internally provided with a circuit board and an adapter plate which are electrically connected, and the adapter plate is arranged on the connecting surface of the electrical box and the detection rod; the detection rod is of a cylindrical cavity structure, one end of the detection rod, which is close to the end cover, is provided with a C-shaped notch, and the center of the C-shaped notch forms a dust measurement area; a penetrating laser emergent hole is formed in the center of a first end face, connected with the cavity of the detection rod, of the C-shaped notch, a penetrating scattering light hole and a penetrating reference light hole are formed in a second end face, opposite to the first end face, of the C-shaped notch, and a threading through hole for communicating the cavity of the detection rod with an outer cavity is formed in a third end face, connected with the first end face and the second end face; a laser mounting seat is arranged in the cavity of the detection rod, a laser diode is vertically arranged in the laser mounting seat, the top of the laser diode is fixed through a pressing plate, an emergent light path of the laser diode is superposed with a connecting line between the center of a laser emergent hole and the center of a reference light hole and passes through the center of a C-shaped notch, and the laser diode is electrically connected with the adapter plate through a first lead; a detector mounting seat is arranged in the outer cavity and fixed on a second end face of the C-shaped notch through a circular cylindrical fixing column, a central through hole of the fixing column is aligned to the reference unthreaded hole and can pass through an emergent light path of the laser diode, the first photodiode is mounted in the center of the detector mounting seat, the second photodiode is mounted on one side of the first photodiode, a connecting line light path of the center of a photosensitive surface of the first photodiode and the center of the scattering unthreaded hole and a connecting line light path of the center of the laser emergent hole and the center of the reference unthreaded hole are intersected in the center of the C-shaped notch, and a connecting line light path of the center of the photosensitive surface of the second photodiode and the center of the reference unthreaded hole and a connecting line light path of the center of the laser emergent hole and the center of; the first photodiode and the second photodiode are electrically connected with the adapter plate through second wires, and the second wires are led out from the outer cavity to the cavity of the detection rod through the threading through holes and then connected to the adapter plate.
Furthermore, in the forward scattering type dust concentration measuring instrument of the present invention, an included angle between a connecting line optical path between the photosensitive surface center of the first photodiode and the center of the scattering aperture and a connecting line optical path between the center of the laser exit aperture and the center of the reference aperture is 10 ° to 30 °.
Furthermore, in the forward scattering type dust concentration measuring instrument of the present invention, a lens is further disposed on a connecting light path between the center of the light sensing surface of the first photodiode and the center of the light scattering hole, and the light path passes through the center of the lens.
Furthermore, in the forward scattering type dust concentration measuring instrument of the present invention, a connection light path between the center of the light sensing surface of the second photodiode and the center of the reference light hole penetrates the fixed column and the detector mounting base to form a reference light channel, and the reference light channel is provided with an optical attenuation sheet in an inclined manner.
Further, the detector mounting base of the forward scattering type dust concentration measuring instrument is provided with a light trap, the light trap is positioned on the other side of the first photodiode, and a reflected light channel is formed between the optical attenuation sheet and the light trap.
Furthermore, the forward scattering type dust concentration measuring instrument of the invention has the advantages that the laser installation tube seat is in a hollow cylindrical shape, and the tube wall of the laser installation tube seat between the laser diode and the first end surface of the C-shaped groove opening (9) is provided with at least one vent hole, so that the laser emergent hole is communicated with the scattering light hole and the reference light hole through the vent holes and the threading through holes.
Furthermore, the detection rod of the forward scattering type dust concentration measuring instrument is provided with a protective gas outlet, one side wall of the electric box is provided with a protective gas interface, and the protective gas interface is connected with the protective gas outlet through a gas pipe.
Furthermore, according to the forward scattering type dust concentration measuring instrument, a signal interface is arranged on one side wall of the electric box, one end of the signal interface is electrically connected with the circuit board, and the other end of the signal interface is connected with an external signal processor.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects:
1. the forward scattering type dust concentration measuring instrument adopts a modular design, is convenient to disassemble and is convenient for field maintenance.
2. The forward scattering type dust concentration measuring instrument adopts a forward scattering laser measuring principle, and can realize dust measurement of ultralow concentration.
3. The forward scattering type dust concentration measuring instrument adopts a double-light-path detection mode of scattered light measurement and range light measurement, and can automatically correct measurement errors caused by laser diode emission power fluctuation, circuit drift, laser lens pollution and the like.
4. The forward scattering type dust concentration measuring instrument adopts positive pressure blowing protective gas to automatically protect a laser diode and a photodiode from being polluted by smoke dust.
5. The forward scattering type dust concentration measuring instrument of the invention does not adopt optical fiber for transmission of laser emission and reception, has no loss of optical signal power transmission, and has simpler and more reliable structure.
6. The forward scattering type dust concentration measuring instrument of the invention preferentially considers the horizontal installation form, so that the detected smoke vertically passes through the measuring area, and the pollution of dust particles scattering to the notch of the detecting rod can be avoided.
Drawings
Fig. 1 is a schematic view of the overall configuration of a forward scattering type dust concentration measuring instrument of the present invention.
Reference signs mean: 1: electrical box, 2: detection rod, 3: detection rod end cover, 4: circuit board, 5: signal interface, 6: interposer, 7: protective gas interface, 8: shielding gas outlet, 9: probe bar notch, 10: laser mount, 11: a gland, 12: vent hole, 13: laser diode, 14: detector mount, 15: fixed column, 16: threading through hole, 17: laser exit hole, 18: scattered light hole, 19: reference aperture, 20: lens, 21: first photodiode, 22: second photodiode, 23: optical attenuation sheet, 24: light trap, 25: reflection light channel, 26: reference light channel, 27: wire, 28: wire, 29: and a dust measurement area.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
A forward scattering type dust concentration measuring instrument is shown in figure 1 and comprises an electrical box 1, a detection rod 2 and an end cover 3, wherein the electrical box 1 is installed outside one end of the detection rod 2, and the end cover 3 is installed outside the other end of the detection rod 2 and forms an outer cavity, so that the interior of the detection rod 2 is electrically in a closed state. The detection rod 2 is provided with a protective gas outlet 8, one side wall of the electrical box 1 is provided with a protective gas interface 7, and the protective gas interface 7 is connected with the protective gas outlet 8 through a gas pipe.
The electrical box 1 is internally provided with a circuit board 4 and an adapter plate 6 which are electrically connected, and the adapter plate 6 is arranged on the connecting surface of the electrical box 1 and the detection rod 2. A signal interface 5 is arranged on one side wall of the electrical box 1, one end of the signal interface 5 is electrically connected with the circuit board 4, and the other end of the signal interface is connected with an external signal processor.
The detection rod 2 is of a cylindrical cavity structure, a C-shaped notch 9 is formed in one end, close to the end cover 3, of the detection rod, a dust measuring area 29 is formed in the center of the C-shaped notch 9, smoke to be detected flows through the dust measuring area 29, and laser beams emitted by the laser diodes 13 irradiate dust in the smoke to generate light scattering. The center of a first end face of the C-shaped groove opening 9 connected with the detection rod cavity is provided with a through laser emergent hole 17, a second end face opposite to the first end face is provided with a through scattered light hole 18 and a reference light hole 19, a third end face connecting the first end face and the second end face is internally provided with a threading through hole 16 communicating the detection rod cavity and an outer cavity, and the threading through hole 16 is used as a wire passageway and a protective gas circulation channel.
A laser installation seat 10 is arranged in the cavity of the detection rod, and the laser installation tube seat 10 is in a hollow cylindrical shape. The laser diode 13 is vertically installed in the laser installation base 10, the top of the laser diode is fixed through the pressing plate 11, at least one vent hole 12 is formed in the pipe wall of the laser installation pipe base 10 between the laser diode 13 and the first end face of the C-shaped notch 9, and the laser emergent hole 17 is communicated with the scattering light hole 18 and the reference light hole 19 through the vent holes 12 and the threading through holes 16. The light path of the emergent light of the laser diode 13 is superposed with the connecting line of the center of the laser emergent hole 17 and the center of the reference light hole 19 and passes through the center of the C-shaped notch 9, and the laser diode 13 is electrically connected with the adapter plate 16 through a first lead 28.
A detector mounting seat 14 is arranged in the outer cavity, the detector mounting seat 14 is fixed on the second end face of the C-shaped groove opening 9 through an annular cylindrical fixing column 15, and a central through hole of the fixing column 15 is aligned with the reference light hole 19 and can pass through an emergent light path of the laser diode 13. The first photodiode 21 is installed at the center of the detector mounting base 14, and the second photodiode 22 is installed at one side of the first photodiode 21.
The connecting line light path of the center of the photosensitive surface of the first photodiode 21 and the center of the scattered light hole 18 and the connecting line light path of the center of the laser emergent hole 17 and the center of the reference light hole 19 are intersected at the center of the C-shaped notch 9, and the included angle is 10-30 degrees. A lens 20 is further disposed on a connecting light path between the center of the light sensing surface of the first photodiode 21 and the center of the scattered light hole 18, and the light path passes through the center of the lens 20. The light path of the connecting line of the center of the light sensing surface of the second photodiode 22 and the center of the reference light hole 19 coincides with the light path of the connecting line of the center of the laser emitting hole 17 and the center of the reference light hole 19. The connecting light path between the center of the light sensing surface of the second photodiode 22 and the center of the reference light hole 19 penetrates through the fixing column 15 and the detector mounting seat 14 to form a reference light channel 26, and the optical attenuation sheet 23 is obliquely arranged on the reference light channel 26.
The first photodiode 21 and the second photodiode 22 are both electrically connected with the adapter plate 6 through a second wire 27, and the second wire 27 is led out from the outer cavity to the interior of the detection rod cavity through the wire through hole 16 and then connected to the adapter plate 6.
The detector mounting base 14 is provided with a light trap 24, the light trap 24 is positioned at the other side of the first photodiode 21, and a reflected light channel 25 is formed between the optical attenuation sheet 23 and the light trap 24.
Thus, the laser beam emitted from the laser diode 13 is irradiated onto the optical attenuation sheet 23 of the reference light channel 26 to generate two paths of light, one path of light is refracted light and enters the photosensitive surface of the second photodiode 22, and the other path of light is reflected light and enters the optical trap 24 through the reflection channel 25.
Example 1
A forward scattering type dust concentration measuring instrument is a core measuring unit of an extraction type dust on-line monitoring system, when dry flue gas containing dust passes through a dust measuring area 29 of the measuring instrument at a certain flow speed, laser emitted by a laser diode 13 is emitted from a laser emitting hole 17 and irradiates dust particles to generate light scattering, a first photodiode 21 is in a working state, the scattered light is detected, an optical signal is converted into a current signal and is sent to a circuit board 4 for amplification, the processed signal is sent to a subsequent signal processor through a signal interface 5, and the concentration value of the dust can be obtained through calculation.
In order to prevent lens pollution and circuit drift, an online monitoring system automatically corrects errors of a sensor at regular time, and the implementation process is as follows: the flue gas channel leading to the measuring instrument is closed, clean gas is introduced into the dust measuring area 29, the laser channel of the dust measuring area 29 is in a clean and dustless state, the signal output by the first photodiode 21 is read to be a zero signal, the photoelectric detector is switched from the first photodiode 21 to the second photodiode 22, and the signal output by the second photodiode 22 is a measuring range signal. And comparing and calculating the zero point signal and the measuring range signal with the original signal calibrated when leaving the factory to obtain a sensor error correction coefficient, and storing the correction coefficient into a signal processor to be used as a correction parameter of a subsequent concentration measurement value, thereby ensuring that the measurement precision of the measuring instrument is always within a normal range.
In order to protect the probe from dust pollution during measurement, a clean dry gas source with certain pressure is connected to the protective gas interface 7, so that the pressure inside the probe 8 is ensured to be slightly positive than the dust measurement area 29, and the pressure is approximately 0.2KPa-2 KPa. Therefore, the protective gas always flows out of the cavity from the laser emergent hole 17, the scattering light hole 18 and the reference light hole 19, so that dust in the dust measuring area 29 is prevented from entering the cavity.
The foregoing is directed to embodiments of the present invention and, more particularly, to a method and apparatus for controlling a power converter in a power converter, including a power converter, a power.
Claims (8)
1. A forward scattering type dust concentration measuring instrument is characterized by comprising an electric box (1), a detection rod (2) and an end cover (3), wherein the electric box (1) is installed outside one end of the detection rod (2), and the end cover (3) is installed outside the other end of the detection rod (2) and forms an outer cavity;
the electric box (1) is internally provided with a circuit board (4) and an adapter plate (6) which are electrically connected, and the adapter plate (6) is arranged on the connecting surface of the electric box (1) and the detection rod (2);
the detection rod (2) is of a cylindrical cavity structure, one end of the detection rod, which is close to the end cover (3), is provided with a C-shaped notch (9), and the center of the C-shaped notch (9) forms a dust measurement area (29); a penetrating laser emergent hole (17) is formed in the center of a first end face, connected with the cavity of the detection rod, of the C-shaped notch (9), a penetrating scattered light hole (18) and a penetrating reference light hole (19) are formed in a second end face, opposite to the first end face, respectively, and a threading through hole (16) for communicating the cavity of the detection rod with the outer cavity is formed in a third end face for connecting the first end face with the second end face;
a laser installation seat (10) is arranged in the cavity of the detection rod, a laser diode (13) is vertically installed in the laser installation seat (10), the top of the laser diode is fixed through a pressing plate (11), an emergent light path of the laser diode (13) and a connecting line between the center of a laser emergent hole (17) and the center of a reference light hole (19) are overlapped and pass through the center of a C-shaped notch (9), and the laser diode (13) is electrically connected with an adapter plate (16) through a first lead (28);
a detector mounting seat (14) is arranged in the outer cavity, the detector mounting seat (14) is fixed on the second end surface of the C-shaped notch (9) through a circular cylindrical fixing column (15), the central through hole of the fixed column (15) is aligned with the reference light hole (19) and can pass through the light path of the emergent light of the laser diode (13), the first photodiode (21) is arranged in the center of the detector mounting seat (14), the second photodiode (22) is arranged on one side of the first photodiode (21), a connecting line light path of the center of the photosensitive surface of the first photodiode (21) and the center of the scattering light hole (18) and a connecting line light path of the center of the laser emergent hole (17) and the center of the reference light hole (19) are intersected at the center of the C-shaped notch (9), and a connecting line light path of the center of the photosensitive surface of the second photodiode (22) and the center of the reference light hole (19) and a connecting line light path of the center of the laser emergent hole (17) and the center of the reference light hole (19) are superposed; the first photodiode (21) and the second photodiode (22) are electrically connected with the adapter plate (6) through second wires (27), and the second wires (27) are led out from the outer cavity to the cavity of the detection rod through the threading through holes (16) and then connected to the adapter plate (6).
2. A forward scattering type dust concentration measuring instrument as claimed in claim 1, wherein an angle between a line optical path of the center of the light sensing surface of the first photodiode (21) and the center of the scattering aperture (18) and a line optical path of the center of the laser emitting aperture (17) and the center of the reference aperture (19) is 10 ° to 30 °.
3. A forward scattering type dust concentration measuring instrument as claimed in claim 1, wherein a lens (20) is further provided on a light path connecting the center of the light-sensing surface of the first photodiode (21) and the center of the scattered light hole (18), and the light path passes through the center of the lens (20).
4. The forward scattering type dust concentration measuring instrument according to claim 1, wherein a connection optical path between the center of the light sensing surface of the second photodiode (22) and the center of the reference light hole (19) passes through the fixed column (15) and the detector mounting seat (14) to form a reference light channel (26), and the optical attenuation sheet (23) is obliquely arranged on the reference light channel (26).
5. The forward scattering type dust concentration measuring instrument according to claim 4, wherein a light trap (24) is provided on the probe mounting base (14), the light trap (24) is located on the other side of the first photodiode (21), and a reflected light path (25) is formed between the optical attenuation sheet (23) and the light trap (24).
6. The forward scattering type dust concentration measuring instrument as claimed in claim 1, wherein the laser mounting base (10) is formed in a hollow cylindrical shape, and at least one vent hole (12) is formed in a wall of the laser mounting base (10) between the laser diode (13) and the first end surface of the C-shaped notch (9) so that the laser emitting hole (17) communicates with the scattering light hole (18) and the reference light hole (19) through the vent hole (12) and the threading through hole (16).
7. The forward scattering type dust concentration measuring instrument according to claim 1, wherein the detecting rod (2) is provided with a shielding gas outlet (8), a side wall of the electrical box (1) is provided with a shielding gas port (7), and the shielding gas port (7) and the shielding gas outlet (8) are connected through a gas pipe.
8. The forward scattering type dust concentration measuring instrument as claimed in claim 1, wherein a signal interface (5) is provided on one side wall of the electrical box (1), and one end of the signal interface (5) is electrically connected to the circuit board (4) and the other end is connected to an external signal processor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010643638.2A CN111665173A (en) | 2020-07-07 | 2020-07-07 | Forward scattering type dust concentration measuring instrument |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010643638.2A CN111665173A (en) | 2020-07-07 | 2020-07-07 | Forward scattering type dust concentration measuring instrument |
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| CN111665173A true CN111665173A (en) | 2020-09-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010643638.2A Pending CN111665173A (en) | 2020-07-07 | 2020-07-07 | Forward scattering type dust concentration measuring instrument |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112326519A (en) * | 2020-10-15 | 2021-02-05 | 上海北分科技股份有限公司 | Detection method and detection device of laser scattering dust meter |
| CN113624651A (en) * | 2021-08-13 | 2021-11-09 | 中绿环保科技股份有限公司 | On-line monitoring device for concentration of particulate matters in flue gas |
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| CN107144507A (en) * | 2017-07-10 | 2017-09-08 | 西石（厦门）科技有限公司 | One kind can self-alignment double light path dust concentration tester |
| CN109520903A (en) * | 2018-12-20 | 2019-03-26 | 南京波瑞自动化科技有限公司 | A kind of double light path laser forward scattering measuring concentration of granules in certain device |
| CN111060430A (en) * | 2019-12-30 | 2020-04-24 | 民政部一零一研究所 | Ultralow dust measuring device with calibration mechanism |
| CN212514143U (en) * | 2020-07-07 | 2021-02-09 | 南京大得科技有限公司 | Forward scattering type dust concentration measuring instrument |
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2020
- 2020-07-07 CN CN202010643638.2A patent/CN111665173A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107144507A (en) * | 2017-07-10 | 2017-09-08 | 西石（厦门）科技有限公司 | One kind can self-alignment double light path dust concentration tester |
| CN109520903A (en) * | 2018-12-20 | 2019-03-26 | 南京波瑞自动化科技有限公司 | A kind of double light path laser forward scattering measuring concentration of granules in certain device |
| CN111060430A (en) * | 2019-12-30 | 2020-04-24 | 民政部一零一研究所 | Ultralow dust measuring device with calibration mechanism |
| CN212514143U (en) * | 2020-07-07 | 2021-02-09 | 南京大得科技有限公司 | Forward scattering type dust concentration measuring instrument |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112326519A (en) * | 2020-10-15 | 2021-02-05 | 上海北分科技股份有限公司 | Detection method and detection device of laser scattering dust meter |
| CN112326519B (en) * | 2020-10-15 | 2024-05-24 | 上海北分科技股份有限公司 | Detection method and detection device of laser scattering dust meter |
| CN113624651A (en) * | 2021-08-13 | 2021-11-09 | 中绿环保科技股份有限公司 | On-line monitoring device for concentration of particulate matters in flue gas |
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Application publication date: 20200915 |