CN108181213A - A kind of outdoor constant current pump suction type laser dust detection device - Google Patents
A kind of outdoor constant current pump suction type laser dust detection device Download PDFInfo
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- CN108181213A CN108181213A CN201711484954.4A CN201711484954A CN108181213A CN 108181213 A CN108181213 A CN 108181213A CN 201711484954 A CN201711484954 A CN 201711484954A CN 108181213 A CN108181213 A CN 108181213A
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- 239000000428 dust Substances 0.000 title claims abstract description 66
- 238000001514 detection method Methods 0.000 title claims abstract description 38
- 238000012360 testing method Methods 0.000 claims abstract description 44
- 239000002245 particle Substances 0.000 claims abstract description 25
- 238000007789 sealing Methods 0.000 claims abstract description 19
- 238000002356 laser light scattering Methods 0.000 claims abstract description 10
- 230000003321 amplification Effects 0.000 claims abstract description 9
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 9
- 238000005070 sampling Methods 0.000 claims description 17
- 238000005086 pumping Methods 0.000 claims description 9
- 239000003638 chemical reducing agent Substances 0.000 claims description 8
- 238000005259 measurement Methods 0.000 claims description 7
- 230000003287 optical effect Effects 0.000 claims description 6
- 230000008033 biological extinction Effects 0.000 claims description 4
- 238000007689 inspection Methods 0.000 claims 1
- 238000012544 monitoring process Methods 0.000 claims 1
- 238000013461 design Methods 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 230000002411 adverse Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000004069 differentiation Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 210000001367 artery Anatomy 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 210000003462 vein Anatomy 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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- 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
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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
- G01N15/075—Investigating concentration of particle suspensions by optical means
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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
- G01N2015/0042—Investigating dispersion of solids
- G01N2015/0046—Investigating dispersion of solids in gas, e.g. smoke
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Abstract
The present invention provides a kind of outdoor constant current pump suction type laser dust detection device, including pump suction type Constant flow sample component, platycelous test chamber, laser of narrowband module and laser light scattering light-receiving member；The pump suction type Constant flow sample component is connected with platycelous test chamber sealing, for dusty gas to be measured to be delivered to the platycelous test chamber；The laser of narrowband module, platycelous test chamber side described in face are set, for generating the 2 5mm narrow-band light sources for being irradiated in dusty gas to be measured；The platycelous test chamber, it is interior to be equipped with dust detection circuit plate, for carrying out signal amplification and particle counting to dusty gas to be measured；The laser light scattering light-receiving member, platycelous test chamber opposite side described in face are set, for absorbing the laser after dust particles to be measured scattering.The present invention have the advantages that design science, it is highly practical, convenient for safeguarding, detection efficiency is high, accuracy of detection height and service life are long.
Description
Technical field
The present invention relates to outdoor laser dust sensor detection technique fields, specifically, relate to a kind of outdoor constant current
Pump suction type laser dust detection device.
Background technology
Outdoor laser dust sensor uses Mie scattering（Mie scattering）Principle carries out the dust in air
Detection.Sensor is usually by laser light source, optical cavity, light-sensitive element, Constant flow sample gas circuit cavity, Signal sampling and processing electricity
The most of composition in road five.Common laser dust sensor uses dotted focused light source, detector and laser optics knot in 90 °
Structure.But since the energy of dotted focused light source is into Gaussian Profile（The unbalanced distribution of energy）, when dust occurs in sampling structure
Scattering, during by being analyzed and processed to the spectral signal that detector receives, spectral signal that detector receives not only with grain size
Size is related, and also related to the unbalanced distribution of light energy, PM2.5 and PM10 particle sizes can not accurately be screened by causing.Light
The design of cavity and gas circuit cavity and the processing of circuit design are learned to the performance of sensor, grain size examination, stability, sensitivity etc.
Factor plays vital influence.With the development of science and technology the more intelligentized development of optical sensor, long-life are non-maintaining
As a step of research and development dust sensor key.
Ordinary sensors due to the pollution of dust atmosphere, measure cavity easily by dust pollution, particularly detector surface with
Dust is easily adsorbed on lasing fluorescence source surface, and the accuracy of sensor is caused to decline, can not be in outdoor long-term excellent work.
In order to solve the problems, such as present on, people are seeking a kind of ideal technical solution always.
Invention content
The purpose of the present invention is in view of the deficiencies of the prior art, so as to provide a kind of design science, it is highly practical, convenient for dimension
Shield, detection efficiency are high, accuracy of detection is high and the outdoor constant current pump suction type laser dust detection device of service life length.
To achieve these goals, the technical solution adopted in the present invention is：A kind of outdoor constant current pump suction type laser dust
Detection device, including pump suction type Constant flow sample component, platycelous test chamber, laser of narrowband module and laser light scattering light receiver
Part；
The pump suction type Constant flow sample component is connected with platycelous test chamber sealing, for dusty gas to be measured is defeated
Send to the platycelous test chamber；
The laser of narrowband module, platycelous test chamber side described in face are set, and the platycelous is radiated at for generating
The 2-5mm narrow-band light sources of dusty gas to be measured in test chamber；
The platycelous test chamber, it is interior be equipped with dust detection circuit plate, for dusty gas to be measured carry out signal amplification with
Particle counting；
The laser light scattering light-receiving member, platycelous test chamber opposite side described in face are set, for absorbing by be measured
Laser after dust particles scattering.
Based on above-mentioned, the laser of narrowband module includes laser module shell and is successively set on the laser module
The laser of narrowband emission port of laser light source, convex lens and cylindrical mirror and the described laser module shell one end of setting in shell,
And the laser mould-group circuit-board being connected with the laser light source of the setting laser module shell other end；The laser light
Distance is 10-35mm between source and the convex lens, and distance is 20-65mm between the convex lens and the cylindrical mirror.
Based on above-mentioned, distance is 30mm, the convex lens and the cylinder between the laser light source and the convex lens
Distance is 65mm between mirror.
Based on above-mentioned, the pump suction type Constant flow sample component includes sealing the dust sampling admission line of connection, the successively
One air speed pipeline, reducer pipe, the second air speed pipeline, dusty gas to be measured split pipeline and dust sampling outlet pipe；Described
One air speed pipeline, the reducer pipe and the second air speed pipeline form micro-pressure-difference measurement structure, wherein, first pitot
One side seal of road is communicated with micro-pressure-difference air inlet duct, and the micro-pressure-difference air inlet duct is set at the first air speed pipeline
First pressure sensor is equipped with, the second air speed pipeline side sealing is communicated with micro-pressure-difference outlet pipe, and the micro-pressure-difference goes out
Feed channel is provided with second pressure sensor, the first pressure sensor and described second at the second air speed pipeline
Pressure sensor connects micro-pressure sensor respectively.
Based on above-mentioned, which further includes sheath gas shielded component, and the sheath gas shielded component includes and the dust to be measured
Gas splits the sheath gas admission line of seal for pipe joints connection, with the sheath gas admission line HEPA filter cores that connect of sealing and
The clean gas outlet pipe connected with another side seal of HEPA filter cores, the clean gas outlet pipe connection are described flat
Concave test chamber.
Based on above-mentioned, it is provided on the outside of the dust sampling outlet pipe and enters platycelous detection for clean gas
The cavity of cavity；The cavity is respectively communicated with the clean gas outlet pipe and the platycelous test chamber.
Based on above-mentioned, the dust detection circuit plate includes the scattered light signal of dust particles to be measured being converted to light
The photoelectric switching circuit of pulse and the signal amplification circuit for the light pulse to be amplified；The opto-electronic conversion electricity
Road includes photodiode and operational amplifier.
Based on above-mentioned, the laser light scattering light-receiving member uses tilted-putted extinction eyeglass.
Based on above-mentioned, the platycelous test chamber forms darkroom using plano-concave speculum.
Based on above-mentioned, the top in the darkroom is connected with dust sampling outlet pipe sealing, the bottom in the darkroom
It is connected with having surveyed the sealing of dusty gas outlet pipe, the gas outlet seal connection pumping system for having surveyed dusty gas outlet pipe
System；The pumping system includes air pump, for the frequency modulator for adjusting the air pump frequency and for being passed according to the micro-pressure-difference
The detected value of sensor drives the controller of the frequency modulator.
The present invention has substantive distinguishing features and progress compared with the prior art, specifically：
1）The present invention provides a kind of outdoor constant current pump suction type laser dust detection device, which uses the laser of narrowband mould
Group forms 2-5mm narrow-band light sources and replaces the dotted focused light source of tradition, and light energy caused by avoiding the dotted focused light source of tradition is not
Equiblibrium mass distribution leads to not accurately screen the problem of PM2.5 is with PM10 particle sizes, substantially increases detection efficiency and detection essence
Degree；
2）The pump suction type Constant flow sample component uses the first air speed pipeline, the reducer pipe and the second air speed pipeline
The micro-pressure-difference measurement structure that sealing connection is formed successively；The gas outlet seal connection pumping for having surveyed dusty gas outlet pipe
System；The pumping system includes air pump, for the frequency modulator for adjusting the air pump frequency and for according to the micro-pressure-difference
The detected value of sensor drives the controller of the frequency modulator；The pressure value feedback that micro-pressure-difference measurement structure measures is passed in micro-pressure-difference
The adjusting of air pump is realized on sensor, the constant current processing of air-flow is completed, makes dust that can pass through the platycelous with constant speed and detect
Housing surface realizes the tally function of reliable powder dust particle；
3）The device further includes sheath gas shielded component, and the sheath gas shielded component includes splitting pipeline with the dusty gas to be measured
The sheath gas admission line of connection is sealed, the HEPA filter cores connected are sealed with the sheath gas admission line and is filtered with the HEPA
The clean gas outlet pipe of another side seal connection of core；The clean gas outlet pipe is close to the dust sampling air outlet pipe
Through-hole is offered at road；Dusty gas to be measured splits pipeline in the dusty gas to be measured and is divided into A branches and B branches, A branch powder
Dust and gas body, which is entered by the dust sampling outlet pipe in the platycelous test chamber, to be detected；B branch dusty gas
Clean gas is generated by the HEPA filter cores, the platycelous test chamber is entered by the clean gas outlet pipe,
A branch dusty gas is wrapped up, effectively the second damage for protecting the not contaminated object of component, it is non-maintaining steady to realize the long-life
Fixed reliable function so that the present apparatus is suitable for outdoor adverse circumstances；
In conclusion the present invention have design science, it is highly practical, convenient for safeguarding, detection efficiency is high, accuracy of detection is high and uses
The advantages of long lifespan.
Description of the drawings
Fig. 1 is the structure diagram of the present invention.
Fig. 2 is the structure diagram of the pump suction type Constant flow sample component of the present invention.
Fig. 3 is the structure diagram of the laser of narrowband module of the present invention.
Fig. 4 is the photoelectric switching circuit of the present invention.
Fig. 5 is the operation principle schematic diagram of the present invention.
In figure：1. laser of narrowband module；2. platycelous test chamber；3. extinction eyeglass；4. pump suction type Constant flow sample component；
5. sheath gas shielded component；11. laser module shell；12. laser light source；13. convex lens；14. cylindrical mirror；15. laser of narrowband is sent out
Loophole；16. laser mould-group circuit-board；41. dust sampling outlet pipe；42. dusty gas to be measured splits pipeline；43. second is empty
Fast pipeline；44. micro-pressure-difference outlet pipe；45. reducer pipe；46. micro-pressure-difference air inlet duct；47. the first air speed pipeline；48. powder
Dirt samples admission line；51. sheath gas admission line；52.HEPA filter cores；53. clean gas outlet pipe.
Specific embodiment
Below by specific embodiment, technical scheme of the present invention is described in further detail.
Embodiment 1
As shown in attached drawing 1- attached drawings 5, a kind of outdoor constant current pump suction type laser dust detection device, it includes pump suction type Constant flow sample
Component 4, platycelous test chamber 2, laser of narrowband module 1 and laser light scattering light-receiving member；The pump suction type Constant flow sample portion
Part 4 is connected with the platycelous test chamber 2 sealing, for the platycelous test chamber for being delivered to dusty gas to be measured
Body 2；The laser of narrowband module 1,2 side of platycelous test chamber described in face are set, including laser module shell 11 and
Laser light source 12, convex lens 13 and the cylindrical mirror 14 and setting being successively set in the laser module shell 11 are described sharp
The laser of narrowband emission port 15 of 11 one end of optical mode assembly housing and swashing with described for setting 11 other end of laser module shell
The connected laser mould-group circuit-board 16 of radiant 12；For generating the dust to be measured being radiated in the platycelous test chamber 2
The 3mm narrow-band light sources of gas；Distance is 30mm between the laser light source 12 and the convex lens 13；The convex lens 13 and institute
Distance is 65mm between stating cylindrical mirror 14；The platycelous test chamber 2, it is interior to be equipped with dust detection circuit plate, for to be measured
Dusty gas carries out signal amplification and particle counting；The laser light scattering light-receiving member, platycelous test chamber 2 described in face
Opposite side is set, for absorbing the laser after dust particles to be measured scattering.
A kind of specific embodiment of pump suction type Constant flow sample component 4 is present embodiments provided, the pump suction type constant current is adopted
Sample component 4 includes sealing the dust sampling admission line 48 of connection, the first air speed pipeline 47, reducer pipe 45, the second air speed successively
Pipeline 43, dusty gas to be measured split pipeline 42 and dust sampling outlet pipe 41；The first air speed pipeline 47, the reducing
Pipe 45 and the second air speed pipeline 43 form micro-pressure-difference measurement structure, and 47 1 side seal of the first air speed pipeline is communicated with micro-
Pressure difference air inlet duct 46, the micro-pressure-difference air inlet duct 46 are provided with first pressure at the first air speed pipeline 47
Sensor；Second air speed pipeline, 43 1 side seal is communicated with micro-pressure-difference outlet pipe 44, the micro-pressure-difference outlet pipe 44
Second pressure sensor, the first pressure sensor and the second pressure are provided at the second air speed pipeline 43
Sensor connects micro-pressure sensor respectively.The first air speed pipeline 47, the reducer pipe 45 and the second air speed pipeline
The 43 micro-pressure-difference measurement structures that sealing connection is formed successively；The gas outlet seal connection pump for having surveyed dusty gas outlet pipe
Desorption system；The pumping system includes air pump, for the frequency modulator for adjusting the air pump frequency and for according to the minute-pressure
The detected value of gap sensor drives the controller of the frequency modulator；The pressure value that micro-pressure-difference measurement structure measures is fed back in micro-pressure-difference
The adjusting of air pump is realized on sensor, the constant current processing of air-flow is completed, makes dust that can pass through the platycelous with constant speed and examine
2 surface of cavity is surveyed, realizes the tally function of reliable powder dust particle.
In order to extend the service life of the present invention, which further includes sheath gas shielded component 5, the sheath gas shielded component 5
The sheath gas admission line 51 connected is sealed including splitting pipeline 42 with the dusty gas to be measured, with the sheath gas admission line 51
The clean gas outlet pipe 53 for sealing the HEPA filter cores 52 of connection and being connected with 52 another side seal of HEPA filter cores；
The clean gas outlet pipe 53 connects the platycelous test chamber 2.41 outside of dust sampling outlet pipe is set
There is the cavity for entering the platycelous test chamber 2 for clean gas；The cavity is respectively communicated with the clean gas outlet
Pipeline 53 and the platycelous test chamber 2.Dusty gas to be measured splits pipeline 42 in the dusty gas to be measured and is divided into A branches
With B branches, A branches dusty gas, which is entered by the dust sampling outlet pipe 41 in the platycelous test chamber 2, to carry out
Detection；B branches dusty gas by the HEPA filter cores 52 generate clean gas, by the clean gas outlet pipe 53 into
Enter the platycelous test chamber 2, wrap up A branch dusty gas, effectively the second damage for protecting the not contaminated object of component
Wound, realizes long-life non-maintaining reliable and stable function so that the present apparatus is suitable for outdoor adverse circumstances.
The present embodiment gives a kind of specific embodiment of dust detection circuit plate, the dust detection circuit plate packet
Include photoelectric switching circuit for the scattered light signal of dust particles to be measured to be converted to light pulse and for by the smooth arteries and veins
Rush the signal amplification circuit being amplified；The photoelectric switching circuit includes photodiode and operational amplifier.By described
Scattered light signal is converted to light pulse signal by photoelectric switching circuit, obtains the distribution of pulse signal in time-domain.
In order to ensure the accuracy of detection of the present embodiment, the laser light scattering light-receiving member uses tilted-putted extinction mirror
Piece 3 absorbs the laser after dust particles to be measured scattering, ensure that the environment in darkroom.The platycelous test chamber 2 is formed
Darkroom, the optical signal after being scattered using plano-concave focusing mirror.The top in the darkroom and the dust sampling outlet pipe 41
Sealing connection, the bottom in the darkroom is connected with having surveyed the sealing of dusty gas outlet pipe, described to have surveyed dusty gas air outlet pipe
The gas outlet seal connection pumping system in road；The pumping system includes air pump, for adjusting the frequency modulator of the air pump frequency,
And the controller for driving the frequency modulator according to the detected value of the micro-pressure sensor.
The laser of narrowband light source of the present embodiment is handled by cleverly optical texture, passes through the convex lens 13 and the column
The cooperation of face mirror 14 generates the laser of narrowband light path of 3mm, realizes the equilibrium treatment of light energy, and the particle for making different-grain diameter is vertical
When passing through light belt, the energy relationship proportional to particle diameter distribution of light is scattered, the grain size being easy to implement on algorithm is distinguished.
The present embodiment realization grain size differentiation, due to each particle generate scattering light intensity be it is very faint, i.e.,
The photoimpact of one very little is coordinated the amplification of photoelectric conversion circuit by plano-concave optically focused cavity, light pulse is converted to
The bigger electric pulse of signal amplitude, is further amplified and is screened using signal amplification circuit, and the particle of different-grain diameter corresponds to
The pulse height of generation is different from pulse width, by the analysis work to a large amount of pulse characteristics data, realizes grain size
Differentiation and tally function.In the calibration experiment of sensor, realize the corresponding calibration of quality micrograms, equipment is allow to export currently
The microgram quantities of environment PM2.5 and PM10, the present embodiment determine the corresponding pulse of different-grain diameter particle by ultra-fine experiment scheme design
Amplitude height and response time carry out the examination of grain size.Allow pump suction type Constant flow sample of the single particle constant speed by special designing
Component 4 simultaneously collects scattering light pulse signal, and the size of recording pulse signal corresponds to the grain size of particle and pulse number corresponds to particle
The result for the particle size distribution that number long time integration is measured and corresponding mass micrograms relationship.
Embodiment 2
The present embodiment and embodiment 1 difference lies in：Between the laser light source and the convex lens distance for 10mm or
15mm either 20mm or 25mm or 35mm；Between the convex lens and the cylindrical mirror distance for 20mm either 30mm or
40mm or 50 mm.
Embodiment 3
The present embodiment and embodiment 1 difference lies in：The laser of narrowband module generation is radiated at the platycelous test chamber
The narrow-band light source bandwidth of interior dusty gas to be measured is 2mm either 4mm or 5mm.
Finally it should be noted that：The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof；To the greatest extent
The present invention is described in detail with reference to preferred embodiments for pipe, those of ordinary skills in the art should understand that：Still
It can modify to the specific embodiment of the present invention or equivalent replacement is carried out to some technical characteristics；Without departing from this hair
The spirit of bright technical solution should all cover in the claimed technical solution range of the present invention.
Claims (10)
1. a kind of outdoor constant current pump suction type laser dust detection device, it is characterised in that：Including pump suction type Constant flow sample component, put down
Concave test chamber, laser of narrowband module and laser light scattering light-receiving member；
The pump suction type Constant flow sample component is connected with platycelous test chamber sealing, for dusty gas to be measured is defeated
Send to the platycelous test chamber；
The laser of narrowband module, platycelous test chamber side described in face are set, and the platycelous is radiated at for generating
The 2-5mm narrow-band light sources of dusty gas to be measured in test chamber；
The platycelous test chamber, it is interior be equipped with dust detection circuit plate, for dusty gas to be measured carry out signal amplification with
Particle counting；
The laser light scattering light-receiving member, platycelous test chamber opposite side described in face are set, for absorbing by be measured
Laser after dust particles scattering.
2. constant current pump suction type laser dust detection device in outdoor according to claim 1, it is characterised in that：Swash the narrowband
Optical mode group includes laser module shell and the laser light source, convex lens and the column that are successively set in the laser module shell
The laser of narrowband emission port and the setting laser module shell of face mirror and the described laser module shell one end of setting are another
The laser mould-group circuit-board being connected with the laser light source of one end；Distance is between the laser light source and the convex lens
10-35mm, distance is 20-65mm between the convex lens and the cylindrical mirror.
3. constant current pump suction type laser dust detection device in outdoor according to claim 2, it is characterised in that：The laser light
Distance is 30mm between source and the convex lens, and distance is 65mm between the convex lens and the cylindrical mirror.
4. according to constant current pump suction type laser dust detection device outside claim 1-3 any one of them room, it is characterised in that：Institute
It states pump suction type Constant flow sample component and includes sealing the dust sampling admission line of connection, the first air speed pipeline, reducer pipe, the successively
Two air speed pipelines, dusty gas to be measured split pipeline and dust sampling outlet pipe；The first air speed pipeline, the reducer pipe
Micro-pressure-difference measurement structure is formed with the second air speed pipeline, wherein, the first air speed pipeline side sealing is communicated with minute-pressure
Poor air inlet duct, the micro-pressure-difference air inlet duct are provided with first pressure sensor at the first air speed pipeline,
The second air speed pipeline side sealing is communicated with micro-pressure-difference outlet pipe, and the micro-pressure-difference outlet pipe is close to the described second sky
Second pressure sensor is provided at fast pipeline, the first pressure sensor and the second pressure sensor connect micro- respectively
Differential pressure pickup.
5. constant current pump suction type laser dust detection device in outdoor according to claim 4, it is characterised in that：The device also wraps
Include sheath gas shielded component, the sheath gas shielded component include with the dusty gas to be measured split sheath gas that seal for pipe joints connects into
Feed channel seals the HEPA filter cores connected with the sheath gas admission line and is connected with another side seal of HEPA filter cores
Clean gas outlet pipe, the clean gas outlet pipe connects the platycelous test chamber.
6. constant current pump suction type laser dust detection device in outdoor according to claim 5, it is characterised in that：The dust is adopted
The cavity for entering the platycelous test chamber for clean gas is provided on the outside of sample outlet pipe；The cavity is respectively communicated with
The clean gas outlet pipe and the platycelous test chamber.
7. constant current pump suction type laser dust detection device in outdoor according to claim 5, it is characterised in that：The dust inspection
Slowdown monitoring circuit plate includes the scattered light signal of dust particles to be measured is converted to the photoelectric switching circuit of light pulse and is used for
The signal amplification circuit that the light pulse is amplified；The photoelectric switching circuit includes photodiode and operation amplifier
Device.
8. constant current pump suction type laser dust detection device in outdoor according to claim 5, it is characterised in that：The laser dissipates
Light-receiving member is penetrated using tilted-putted extinction eyeglass.
9. constant current pump suction type laser dust detection device in outdoor according to claim 5, it is characterised in that：The platycelous
Test chamber forms darkroom using plano-concave speculum.
10. constant current pump suction type laser dust detection device in outdoor according to claim 9, it is characterised in that：The darkroom
The sealing of top and the dust sampling outlet pipe connect, the bottom in the darkroom and surveyed dusty gas outlet pipe and sealed
Connection, the gas outlet seal connection pumping system for having surveyed dusty gas outlet pipe；The pumping system includes air pump, uses
In the frequency modulator for adjusting the air pump frequency and for driving the frequency modulator according to the detected value of the micro-pressure sensor
Controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711484954.4A CN108181213A (en) | 2017-12-29 | 2017-12-29 | A kind of outdoor constant current pump suction type laser dust detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711484954.4A CN108181213A (en) | 2017-12-29 | 2017-12-29 | A kind of outdoor constant current pump suction type laser dust detection device |
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| CN108181213A true CN108181213A (en) | 2018-06-19 |
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| CN201711484954.4A Pending CN108181213A (en) | 2017-12-29 | 2017-12-29 | A kind of outdoor constant current pump suction type laser dust detection device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109406352A (en) * | 2018-11-28 | 2019-03-01 | 苏州源慧达智能科技有限公司 | Light correlation oil smoke detection device with sheath gas shielded |
| CN110231261A (en) * | 2019-05-10 | 2019-09-13 | 武汉四方光电科技有限公司 | A kind of particle concentration detection device |
| CN110595971A (en) * | 2019-10-16 | 2019-12-20 | 恒天益科技（深圳）有限公司 | Ultra-low dust meter |
| WO2023184610A1 (en) * | 2022-03-29 | 2023-10-05 | 安徽理工大学 | Real-time mine dust detection system and method based on double photoacoustic spectrums |
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