CN207730615U - 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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- CN207730615U CN207730615U CN201721901673.XU CN201721901673U CN207730615U CN 207730615 U CN207730615 U CN 207730615U CN 201721901673 U CN201721901673 U CN 201721901673U CN 207730615 U CN207730615 U CN 207730615U
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Abstract
The utility model 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 to 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 setting described in face, 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 board, for carrying out signal amplification and particle counting to dusty gas to be measured；The laser light scattering light-receiving member, platycelous test chamber other side setting described in face, for absorbing the laser after dust particles to be measured scatter.The utility model have the advantages that design science, it is highly practical, convenient for safeguarding, detection efficiency is high, accuracy of detection is high and with long service life.
Description
Technical field
The utility model is related 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 at Gaussian Profile（The unbalanced distribution of energy）, when dust occurs in sampling structure
Scattering, when carrying out analyzing processing by the spectral signal that is received to detector, 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 dust atmosphere pollution, measure cavity easily by dust pollution, especially detector surface with
Lasing fluorescence source surface is easy absorption dust, and the accuracy of sensor is caused to decline, can not be in outdoor long-term excellent work.
In order to solve the above problems, people are seeking always a kind of ideal technical solution.
Invention content
The purpose of this utility model is in view of the deficiencies of the prior art, to provide a kind of design science, highly practical, just
In maintenance, detection efficiency is high, accuracy of detection is high and outdoor constant current pump suction type laser dust detection device with long service life.
To achieve the goals above, technical solution used by the utility model is：A kind of outdoor constant current pump suction type laser
Dust investigating, including pump suction type Constant flow sample component, platycelous test chamber, laser of narrowband module and laser light scattering light connect
Receive component；
The pump suction type Constant flow sample component is connected to platycelous test chamber sealing, is used for dust gas to be measured
The platycelous test chamber that body is delivered to；
The laser of narrowband module, platycelous test chamber side setting described in face, for generate be radiated at it is described flat
The 2-5mm narrow-band light sources of dusty gas to be measured in concave test chamber；
The platycelous test chamber, it is interior to be equipped with dust detection circuit board, it is put for carrying out signal to dusty gas to be measured
Greatly and particle counting；
The laser light scattering light-receiving member, platycelous test chamber other side setting described in face, passes through for absorbing
Laser after dust particles scattering to be measured.
Based on above-mentioned, the laser of narrowband module includes laser module shell, and is successively set on the laser module
Laser light source, convex lens in shell and cylindrical mirror, and the laser of narrowband emission port of laser module shell one end is set,
And the laser mould-group circuit-board of the setting laser module shell other end being connected with the laser light source；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 the dust sampling admission line for sealing connection 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
It is equipped with first pressure sensor, 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 is separately connected micro-pressure sensor.
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, and the HEPA filter cores being connected to are sealed with the sheath gas admission line, and
The clean gas outlet pipe being connected to 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 board includes for the scattered light signal of dust particles to be measured to be 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 constitutes darkroom using plano-concave speculum.
Based on above-mentioned, the top in the darkroom is connected to dust sampling outlet pipe sealing, the bottom in the darkroom
It is connected to the sealing of dusty gas outlet pipe has been surveyed, the gas outlet seal connection pumping system for having surveyed dusty gas outlet pipe
System；The pumping system includes air pump, 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 utility model has substantive features and progress compared with the prior art, specifically：
1）The utility model provides a kind of outdoor constant current pump suction type laser dust detection device, and the device is using described narrow
Band laser module forms 2-5mm narrow-band light sources and replaces the dotted focused light source of tradition, caused by avoiding the dotted focused light source of tradition
The unbalanced distribution of light energy leads to not accurately screen the problem of PM2.5 is with PM10 particle sizes, substantially increases detection efficiency
And accuracy of detection；
2）The pump suction type Constant flow sample component uses the first air speed pipeline, the reducer pipe and second air speed
Pipeline seals the micro-pressure-difference measurement structure that connection is formed successively；The gas outlet seal connection for having surveyed dusty gas outlet pipe
Pumping system；The pumping system includes air pump, the frequency modulator for adjusting the air pump frequency, and for according to described micro-
The detected value of differential pressure pickup drives the controller of the frequency modulator；The pressure value that micro-pressure-difference measurement structure measures is fed back in minute-pressure
The adjusting that air pump is realized on gap sensor is completed the constant current processing of air-flow, makes dust that can be passed through the platycelous with constant speed
Test chamber 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 being split with the dusty gas to be measured
The sheath gas admission line of seal for pipe joints connection seals the HEPA filter cores that are connected to the sheath gas admission line, and with it is described
The clean gas outlet pipe of another side seal connection of HEPA filter cores；The clean gas outlet pipe is close to the dust sampling
Through-hole is offered at outlet pipe；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 dusty gas, which is entered by the dust sampling outlet pipe in the platycelous test chamber, to be detected；B branch powder
Dust and gas body generates clean gas by the HEPA filter cores, is detected into the platycelous by the clean gas outlet pipe
Cavity wraps up A branch dusty gas, effectively the second damage for protecting the not contaminated object of component, realizes the long-life and exempts from
It safeguards stability reliable function so that the present apparatus is suitable for outdoor adverse circumstances；
In conclusion the utility model have design science, it is highly practical, convenient for safeguarding, detection efficiency is high, accuracy of detection
Advantage high and with long service life.
Description of the drawings
Fig. 1 is the structural schematic diagram of the utility model.
Fig. 2 is the structural schematic diagram of the pump suction type Constant flow sample component of the utility model.
Fig. 3 is the structural schematic diagram of the laser of narrowband module of the utility model.
Fig. 4 is the photoelectric switching circuit of the utility model.
Fig. 5 is the operation principle schematic diagram of the utility model.
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 implementation mode
Below by specific implementation mode, the technical solution of the utility model 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 current
Sample unit 4, platycelous test chamber 2, laser of narrowband module 1 and laser light scattering light-receiving member；The pump suction type constant current is adopted
Sample component 4 is connected to the platycelous test chamber 2 sealing, the platycelous inspection for dusty gas to be measured to be delivered to
Survey cavity 2；The laser of narrowband module 1,2 side of platycelous test chamber setting described in face, including laser module shell 11,
And it is successively set on laser light source 12, convex lens 13 and cylindrical mirror 14 in the laser module shell 11, and setting institute
State the laser of narrowband emission port 15 of 11 one end of laser module shell, and setting 11 other end of laser module shell with institute
State the connected laser mould-group circuit-board 16 of laser light source 12；For generate be radiated at it is to be measured in the platycelous test chamber 2
The 3mm narrow-band light sources of dusty gas；Distance is 30mm between the laser light source 12 and the convex lens 13；The convex lens 13
Distance is 65mm between the cylindrical mirror 14；The platycelous test chamber 2, it is interior be equipped with dust detection circuit board, for pair
Dusty gas to be measured carries out signal amplification and particle counting；The laser light scattering light-receiving member, platycelous detection described in face
2 other side of cavity is arranged, for absorbing the laser after dust particles to be measured scattering.
A kind of specific implementation mode 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 the dust sampling admission line 48 for sealing connection successively, the first air speed pipeline 47, reducer pipe 45, the second air speed
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
It is provided with second pressure sensor, the first pressure sensor and the second pressure at the second air speed pipeline 43
Sensor is separately connected micro-pressure sensor.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, 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 that air pump is realized on sensor is completed the constant current processing of air-flow, makes dust that can be passed through the platycelous with constant speed and examine
2 surface of cavity is surveyed, the tally function of reliable powder dust particle is realized.
In order to extend the service life of the utility model, which further includes sheath gas shielded component 5, sheath gas shielded portion
Part 5 includes splitting pipeline 42 with the dusty gas to be measured to seal the sheath gas admission line 51 being connected to, with the sheath gas air inlet pipe
Road 51 seals the HEPA filter cores 52 of connection, and the clean gas outlet pipe being connected to 52 another side seal of the HEPA filter cores
53；The clean gas outlet pipe 53 is connected to the platycelous test chamber 2.41 outside of the dust sampling outlet pipe is set
It is equipped with the cavity for entering the platycelous test chamber 2 for clean gas；The cavity is respectively communicated with the clean gas and goes out
Feed channel 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 branch
Road and B branches, A branches dusty gas by the dust sampling outlet pipe 41 enter in the platycelous test chamber 2 into
Row detection；B branch dusty gas generates clean gas by the HEPA filter cores 52, passes through the clean gas outlet pipe 53
Into the platycelous test chamber 2, A branch dusty gas is wrapped up, effectively second protects the not contaminated object of component
Damage, 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 implementation mode of dust detection circuit board, the dust detection circuit board packet
The photoelectric switching circuit for the scattered light signal of dust particles to be measured to be converted to light pulse is included, and is used for 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 that the accuracy of detection of the present embodiment, the laser light scattering light-receiving member use 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 constituted
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 to the sealing of dusty gas outlet pipe has been surveyed, described to have surveyed dusty gas escape pipe
The gas outlet seal in road is connected to pumping system；The pumping system includes air pump, the frequency modulator for adjusting 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, keeps the particle of different-grain diameter 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 with 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, realizes 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 be 10mm or
Person 15mm either 20mm or 25mm or 35mm；Between the convex lens and the cylindrical mirror distance be 20mm or 30mm or
Person 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 detection
The narrow-band light source bandwidth of dusty gas to be measured in cavity is 2mm either 4mm or 5mm.
Finally it should be noted that：Above example is only to illustrate the technical solution of the utility model rather than limits it
System；Although the utility model is described in detail with reference to preferred embodiment, those of ordinary skill in the art should
Understand：It can still modify to specific embodiment of the present utility model or some technical characteristics are equally replaced
It changes；Without departing from the spirit of technical solutions of the utility model, should all cover in the claimed technical solution of the utility model
In range.
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 to 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 setting described in face are radiated at the platycelous 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 board, for dusty gas to be measured carry out signal amplification with
Particle counting；
The laser light scattering light-receiving member, platycelous test chamber other side setting described in face, 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 laser light source, convex lens and the column being successively set in the laser module shell
Face mirror, and the laser of narrowband emission port of laser module shell one end is set, and the setting laser module shell is 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 includes the dust sampling admission line for sealing connection successively, the first air speed pipeline, reducer pipe, to state pump suction type Constant flow sample component
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 empty close to described second
Second pressure sensor is provided at fast pipeline, the first pressure sensor and the second pressure sensor are separately connected micro-
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 is connected into
Feed channel seals the HEPA filter cores being connected to the sheath gas admission line, and is connected to another side seal of HEPA filter cores
Clean gas outlet pipe, the clean gas outlet pipe is connected to 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 photoelectric switching circuit for the scattered light signal of dust particles to be measured to be converted to 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
It penetrates light-receiving member and uses 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 constitutes 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 be connected to, 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, is used
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.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721901673.XU CN207730615U (en) | 2017-12-29 | 2017-12-29 | A kind of outdoor constant current pump suction type laser dust detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721901673.XU CN207730615U (en) | 2017-12-29 | 2017-12-29 | A kind of outdoor constant current pump suction type laser dust detection device |
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| CN207730615U true CN207730615U (en) | 2018-08-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108181213A (en) * | 2017-12-29 | 2018-06-19 | 汉威科技集团股份有限公司 | A kind of outdoor constant current pump suction type laser dust detection device |
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2017
- 2017-12-29 CN CN201721901673.XU patent/CN207730615U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108181213A (en) * | 2017-12-29 | 2018-06-19 | 汉威科技集团股份有限公司 | A kind of outdoor constant current pump suction type laser dust detection device |
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