CN107831099A - The detection means and detection method of air particle - Google Patents
The detection means and detection method of air particle Download PDFInfo
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- CN107831099A CN107831099A CN201711185946.XA CN201711185946A CN107831099A CN 107831099 A CN107831099 A CN 107831099A CN 201711185946 A CN201711185946 A CN 201711185946A CN 107831099 A CN107831099 A CN 107831099A
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- 238000001514 detection method Methods 0.000 title claims abstract description 50
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- 230000003287 optical effect Effects 0.000 claims abstract description 33
- OAKJQQAXSVQMHS-UHFFFAOYSA-N hydrazine group Chemical group NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 claims abstract description 25
- 238000009792 diffusion process Methods 0.000 claims abstract description 13
- 238000005259 measurement Methods 0.000 claims description 41
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Classifications
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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
-
- 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, e.g. by light scattering, diffraction, holography or imaging
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- G01N15/075—
-
- 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
- G01N2015/03—Electro-optical investigation of a plurality of particles, the analyser being characterised by the optical arrangement
- G01N2015/035—Electro-optical investigation of a plurality of particles, the analyser being characterised by the optical arrangement the optical arrangement forming an integrated apparatus with the sample container
Abstract
The invention discloses a kind of detection means of air particle, including length switchable light source cell, scatter equal filter unit, scatter chamber unit, fall into light hydrazine unit, measure chamber unit, optical detecting unit and computer system unit, length switchable light source cell launches the light of a certain specific wavelength, and it is irradiated on the equal filter unit of scattering and carries out diffusing scattering, caused diffusion light is irradiated on the particulate matter flowed through in scattering chamber unit, further produce scattering light, scattering light in the axial direction enters in sunken light hydrazine unit and is blocked and eliminated, scattering light in the axial direction produces electric signal on measured chamber unit arrival optical detecting unit again simultaneously, the electric signal is transferred to computer system unit and carries out calculating processing, obtain scattering the instant number of the particulate matter in chamber unit.The present invention has very high concentration detecting capability, particle size size detection ability, visibility detectability.In addition, the present invention also provides a kind of detection method of air particle.
Description
Technical field
The present invention relates to air particle detection field, more particularly to a kind of detection means of air particle and detection side
Method.The present invention relates to being scattered after suspended particulate substance in the light irradiation air using different-waveband, scattering light enters highly sensitive
Degree photoelectric conversion device is detected, then coordinates the gas circuit equipment of periphery, and particle in air can be analyzed in real time by setting up into one kind
The device of thing (atmospheric aerosol) concentration.It is mainly used in atmospheric science research, atmospheric visibility observation, Aerosol scattering coefficient
Measurement, the correlative study etc. of fine granular thing (PM2.5 or PM10).
Background technology
With the aggravation of industrial pollution, haze weather frequently occurs, and air pollution has seriously affected human body and has been good for
Health.The detection of air quality becomes particularly important, and the particulate matter in air is detected, analyzed and research is current environmentally friendly work
The emphasis of work.Aerodynamically diameter, Atmospheric particulates can be divided into：(1) diameter is less than 100 microns of total suspension
Grain thing (abbreviation TSP)；(2) diameter is less than 10 microns of pellet；(3) diameter is less than 2.5 microns of fine particle.Its
Middle fine particle PM2.5 can suspend in an atmosphere for a long time, and it has important influence to air quality and visibility etc..With compared with
Thick Atmospheric particulates are compared, and PM2.5 particle diameter is small, and area is big, and activity is strong, easily incidentally poisonous and harmful substances (such as heavy metal,
Microorganism etc.), and residence time length in an atmosphere, displacement is remote, therefore to the shadow of health and atmosphere quality
Sound is relatively bigger.
Substantially three kinds of the method for current traditional test PM2.5 and PM10 concentration：(1) manual weight method；(2) day is vibrated
Flat method；(3) beta ray mensuration.These three methods have its drawback：The first manual weight method can not do continuous automatic inspection
Survey, and acquisition time at least wants more than 30 minutes；Although second of concussion sedimentation balance method measurement accuracy is high and can draw survey in real time
Data are measured, but this method is influenceed very seriously by air humidity, and this method is very high to mechanical design requirements, causes price
High, later maintenance is difficult；Although the third method can continuous sampling, acquisition time at least want more than 30 minutes, it is necessary to
Consumptive material and substantial amounts of maintenance cost, and inside has beta ray source, there is the injury that can not be estimated to human body.
The content of the invention
, can be preferably to big it is an object of the invention to provide a kind of detection means of air particle and detection method
Aerated particle thing carries out real-time, high precision test, to solve above-mentioned three kinds of detection method problem encountered in the prior art.
In order to solve the above problems, the present invention provides a kind of detection means and detection method of air particle, its technology
Scheme is as follows：
A kind of detection means of air particle, including length switchable light source cell, the length switchable light source list
Member is used to launch light；Equal filter unit is scattered, the equal filter unit of scattering is located at the length switchable light source cell
Lower section, the equal filter unit of scattering are used to carry out diffusing scattering to light, produce diffusion light；Scatter chamber unit, the scattering
Chamber unit is located at the lower section of the length switchable light source cell and positioned at the downside of the equal filter unit of scattering, is dissipated described
The left surface for penetrating chamber unit is provided with the first micropore, the second micropore is provided with the right flank of the scattering chamber unit, described
Under test gas has been flowed through in scattering chamber unit, has contained suspended particulate substance in the under test gas；Fall into light hydrazine unit, the sunken light hydrazine
Unit is provided with light refraction unit and the first diaphragm list positioned at the left side of the scattering chamber unit in the sunken light hydrazine unit
Member, is provided with the 3rd micropore on the first diaphragm unit, and the first diaphragm unit is located at first micropore and the light
Between learning refractive elements, the sunken light hydrazine unit is used to eliminate veiling glare；Chamber unit is measured, the measurement chamber unit is positioned at described
The right side of chamber unit is scattered, the second diaphragm unit is provided with the measurement chamber unit, is provided with the second diaphragm unit
4th micropore, first micropore, second micropore, the 3rd micropore, the 4th micropore are in same level, institute
Measurement chamber unit is stated to be used to limit measurement volume and eliminate veiling glare；Optical detecting unit, the optical detecting unit and the measurement
Chamber unit is connected；Computer system unit, the computer system unit are connected with the optical detecting unit.
The detection means of air particle described above, more preferably：Also include shading blade unit, the anti-dazzling screen
Unit is rotatably provided in scattering chamber unit, and positioned at the right-hand member of the equal filter unit of scattering.
The detection means of air particle described above, more preferably：The activity installation in the measurement chamber unit
There is optical shutter unit, the optical shutter unit is located at the top of second micropore.
The detection means of air particle described above, more preferably：Pressure is provided with the scattering chamber unit
Sensor, for measuring the pressure of the under test gas in real time, the pressure sensor is connected with the computer system unit.
The detection means of air particle described above, more preferably：Temperature is provided with the scattering chamber unit
Sensor, for measuring the temperature of the under test gas in real time, the temperature sensor is connected with the computer system unit.
The detection means of air particle described above, more preferably：Humidity is provided with the scattering chamber unit
Sensor, for measuring the humidity of the under test gas in real time, the humidity sensor is connected with the computer system unit.
The detection means of air particle described above, more preferably：Also include calibration module unit, the calibration
Modular unit is connected with the computer system unit, for calibrating zero point and punctuate automatically.
The detection means of air particle described above, more preferably：Also include peripheral gas circuit equipment, the periphery
Gas circuit equipment is connected with the scattering chamber unit, for the under test gas to be passed through in the scattering chamber unit in real time.
The detection method of the detection means of air particle described above, comprises the following steps：
Step 1: the length switchable light source cell launches the light of a certain specific wavelength, and it is irradiated to described dissipate
Penetrate and diffusing scattering is carried out on equal filter unit, produce diffusion light；
Step 2: the diffusion light is irradiated on the suspended particulate substance flowed through in the scattering chamber unit, enter one
Step produces scattering light；
Step 3: direct projection is irradiated to light after being entered to the scattering light at non-measured end in the sunken light hydrazine unit in the axial direction
Learn and be scattered on refractive elements, it scatters light and is blocked and eliminated by the first diaphragm unit in sunken light hydrazine unit；
Step 4: scattering light in the axial direction reaches by the measurement chamber unit and produces telecommunications on the optical detecting unit
Number；
Step 5: the electric signal is transferred to the computer system unit, the scattering is obtained after calculating is handled
The instant number of suspended particulate substance in chamber unit.
Detection method described above, more preferably：In step 4, the second diaphragm list in the measurement chamber unit
Member carries out secondary elimination to scattering light.
The detection means of the air particle of the present invention is using closed integration transmissometer equipment and computer system unit
It is combined, it is maximum using high stable light source and the photodetector of maximum sensitivity using Bill's Lambert Law as theoretical foundation
The measurement atmospheric visibility of limit and the concentration of atmosphere pollution.Closed integration transmissometer be one kind can measure in air-flow hang
The equipment of floating particles thing Extinction Characteristic, closed integrate transmissometer in have one can be from the light for being laterally emitted specific wavelength
Source, scattering can be produced after the suspended particulate substance that the illumination that the light source is sent is mapped in chamber (scattering chamber unit), in closed product
One end of transmissometer is divided to be detected using high sensitivity photelectric receiver (optical detecting unit), it is dense with particulate matter so as to be converted to
Spend related electric signal, and then computer is handled the signal according to specific algorithm, obtain specific particle concentration,
The information such as particle size size, extinction coefficient and visibility.
Brief description of the drawings
Fig. 1 is that the detection means of the air particle of the present invention carries out the schematic diagram that omnidirectional scatters working condition；
Fig. 2 is that the detection means of the air particle of the present invention carries out the schematic diagram of back scattering working condition；
Fig. 3 is that the detection means of the air particle of the present invention carries out the schematic diagram of energy of light source detection；
Fig. 4 irradiates particulate matter for light source in the detection means of the air particle of the present invention and produces the schematic diagram scattered；
Wherein, 1, length switchable light source cell；2nd, equal filter unit is scattered；3rd, suspended particulate substance；4th, chamber unit is scattered；
5th, light hydrazine unit is fallen into；6th, the first diaphragm unit；7th, chamber unit is measured；8th, optical shutter unit；9th, shading blade unit；10th, light is examined
Survey unit；11st, computer system unit；12nd, light refraction unit；13rd, the second diaphragm unit；14th, the first border；15th, second
Border.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
As shown in figure 1, the detection means of the air particle of the present invention, including：Length switchable light source cell 1, is used for
Launch light；Equal filter unit 2 is scattered, positioned at the lower section of length switchable light source cell 1, equal filter unit 2 is scattered and is used for pair
Light carries out diffusing scattering, produces diffusion light；Chamber unit 4 is scattered, positioned at the lower section of length switchable light source cell 1 and positioned at scattered
The downside of equal filter unit 2 is penetrated, the first micropore is provided with the left surface of scattering chamber unit 4, in the right flank of scattering chamber unit 4
The second micropore is provided with, under test gas has been flowed through in scattering chamber unit 4, has contained suspended particulate substance 3 under test gas；Fall into light hydrazine
Unit 5, positioned at the left side of scattering chamber unit 4, the diaphragm unit 6 of light refraction unit 12 and first is provided with sunken light hydrazine unit 5,
The 3rd micropore is provided with the first diaphragm unit 6, the first diaphragm unit 6 between the first micropore and light refraction unit 12,
Light hydrazine unit 5 is fallen into be used to eliminate veiling glare；Chamber unit 7 is measured, positioned at the right side of scattering chamber unit 4, is set in measurement chamber unit 7
There is the second diaphragm unit 13, the 4th micropore, the first micropore, the second micropore, the 3rd micropore, are provided with the second diaphragm unit 13
In same level, measurement chamber unit 7 is used to limit measurement volume and eliminates veiling glare four micropores；Optical detecting unit 10, and
Chamber unit 7 is measured to be connected；Computer system unit 11, it is connected with optical detecting unit 10.
Sum it up, the present invention innovatively provides a kind of detection means of air particle, integrated using closed turbid
Degree instrument equipment and computer system unit are combined, and wherein closed integration transmissometer includes length switchable light source cell 1, dissipated
Penetrate equal filter unit 2, scattering chamber unit 4, fall into light hydrazine unit 5, measurement chamber unit 7, optical detecting unit 10.In order to more accurate
The size of particle size is measured, the present invention is entered using a kind or the light source (length switchable light source cell 1) more than a kind of wavelength
The irradiation and detection of row particulate matter, the calculating of particle size is then carried out further according to scattering principle.The light source of different wave length
Brightness has constant proportionate relationship, it is preferable that in addition to it can use the light source approach of linear array, the best approach is by different ripples
Together, these light sources can be used but not limited to emitting led the light-source encapsulation of section, can also be arranged according to certain relation
One row, two rows or three rows and more than, can also be placed on the single circuit board of very little, can also be placed on one individually
In component package.In the present invention, before light source is irradiated to suspended particulate substance 3, light is entered by scattering equal filter unit 2
Row diffusing scattering, light is set more uniformly to be irradiated on the suspended particulate substance 3 flowed through in scattering chamber unit 4, it is preferable that these dissipate
It can be arbitrary shape to penetrate equal filter unit 2.In the present invention, from measurement chamber unit 7 to be designed with optical detecting unit 10 by
According to the second diaphragm unit 13 of integration volume settings, these one side of the second diaphragm unit 13 play the work for limiting measurement volume
With on the other hand can also reducing useless veiling glare and enter detector (optical detecting unit 10).It is miscellaneous in order to further reduce
The influence of astigmatism, sunken light hydrazine unit 5 is devised in of the invention, so as to which the useless veiling glare of light source direct projection to non-measured end is entered
Row eliminates, and so as to reduce optical noise to greatest extent, improves signal to noise ratio, it is preferable that can add 1 in sunken light hydrazine unit 5
The individual or first diaphragm unit 6 of more than 1, the effect of these the first diaphragm units 6 are to eliminate useless veiling glare.
As shown in figure 1, in order to measure omnidirectional's scattered signal and backscatter signal respectively, present invention additionally comprises anti-dazzling screen list
Member 9, shading blade unit 9 are rotatably provided in scattering chamber unit 4, and positioned at the right-hand member for scattering equal filter unit 2, it is preferable that
When carrying out omnidirectional measurement, shading blade unit 9 does not block the suspension in length switchable light source cell 1 with scattering chamber unit 4
Between particulate matter 3；When needing to carry out back scattering measurement, shading blade unit 9 can shelter from half and be dissipated by what light was irradiated to
Penetrate the volume of the cavity of chamber unit 4, this half volume being blocked be length switchable light source cell 1 to measurement chamber unit 7 this
The volume of side.
As shown in figure 1, in order to obtain more accurate measurement signal, activity installation in chamber unit 7 is being measured in the present invention
There is optical shutter unit 8, optical shutter unit 8 is located at the top of the second micropore, it is preferable that optical shutter unit 8 can be equal
Mating plate etc. has the optics of transmission function, for determining the light intensity of light source.
Preferably, for the ease of the pressure of measurement under test gas in real time, further pressure parameter is brought into calculating, with
Measurement result is just converted to the value under normal atmospheric pressure, in of the invention, pressure sensor is provided with scattering chamber unit 4,
Preferably, pressure sensor is connected with computer system unit 11.
Preferably, for the ease of the temperature of measurement under test gas in real time, so as to which temperature parameter further is brought into calculating
In, so as to which measurement result is converted into value of the normal atmospheric pressure with a temperature of, in of the invention, it is provided with scattering chamber unit 4
Temperature sensor, it is preferable that temperature sensor is connected with computer system unit 11.
Preferably, for the ease of the humidity of measurement under test gas in real time, so as to which humidity parameter further is brought into calculating
In, in the present invention, it is provided with humidity sensor in scattering chamber unit 4, it is preferable that humidity sensor and computer system unit 11
It is connected.
Preferably, in order to reduce measurement drift, automatic calibration zero point and punctuate are carried out, present invention additionally comprises calibration module list
Member, calibration module unit are connected with computer system unit 11.Under the control of a computer system, closed integration transmissometer is pressed
Zero point correction and punctuate calibration are carried out according to regular hour rule, and then increases the accuracy of measured value.Preferably, zero point school
Standard uses the pure air without particulate matter, and as zero gas, the scattering value measured using the gas is the sharp keen scattering of air；Mark
Point calibration uses the high-pure gas of its known extinction coefficient, and as calibrating gas, the scattering value measured using calibrating gas is
Know the standard value of extinction coefficient.Therefore deduce that closed integration transmissometer is joined for the measurement of particulate matter extinction coefficient
Number, the more features such as the extinction coefficient of under test gas can be measured using these parameters.
Preferably, present invention additionally comprises peripheral gas circuit equipment, peripheral gas circuit equipment to be connected with scattering chamber unit 4, for inciting somebody to action
Under test gas is passed through in scattering chamber unit 4 in real time.
Preferably, the detection method of the detection means of air particle of the invention comprises the following steps：
Step 1: length switchable light source cell 1 launches the light of a certain specific wavelength, and it is irradiated to the equal mating plate of scattering
Diffusing scattering is carried out on unit 2, produces diffusion light；
Step 2: diffusion light is irradiated on the suspended particulate substance 3 flowed through in scattering chamber unit 4, scattering is further produced
Light；
Step 3: direct projection is irradiated to optics after being entered to the scattering light at non-measured end in sunken light hydrazine unit 5 in the axial direction
It is scattered on refractive elements 12, it scatters light and carried out by the first diaphragm unit 6 in sunken light hydrazine unit 5 and sunken light hydrazine unit 5
Block and eliminate；
Step 4: the measured chamber unit 7 of scattering light in the axial direction reaches and produces electric signal on optical detecting unit 10；
Step 5: electric signal is transferred to computer system unit 11, obtain scattering in chamber unit 4 after calculating is handled
The instant number of suspended particulate substance 3.
Preferably, in step 4, the second diaphragm unit 13 measured in chamber unit 7 carries out secondary elimination to scattering light.
As shown in figure 1, in the present invention, after length switchable light source cell 1 launches the light of a certain specific wavelength, irradiation
Diffusing scattering is produced on equal filter unit 2 to scattering, these diffusion lights, which continue to be irradiated to forward, flows through hanging in scattering chamber unit 4
On floating particles thing 3, scattering light is further produced, after scattering light in the axial direction is entered in sunken optical trapping unit 5, is irradiated to optics
It is scattered on refractive elements 12, it scatters light and is blocked and disappeared by the first diaphragm unit 6 of sunken optical trapping unit 5 and Qi Nei
Remove；The measured chamber unit 7 of scattering light in the axial direction reaches produces electric signal on optical detecting unit 10.This electric signal transmission
After computer system unit 11, handled by further calculating, obtain suspended particulate substance 3 in current scattering chamber unit 4
Quantity.Quantity of the suspended particulate substance 3 within the unit interval in scattering chamber unit 4 directly affects computer system unit 11 and measured
Numerical value.In such cases, the light irradiation that the just length switchable light source cell 1 that optical detecting unit 10 detects is launched
To after the suspended particulate substance 3 in scattering chamber unit 4, the summation of the scattering light of forward scattering and back scattering is carried out.
As shown in Fig. 2 in the present invention, shading blade unit 9 is blocked in length switchable light source cell 1 and measurement chamber unit 7
Between, after length switchable light source cell 1 launches the light of a certain specific wavelength, it is irradiated on the equal filter unit 2 of scattering and produces
Raw diffusing scattering, these diffusion lights continue to be irradiated to forward on the suspended particulate substance 3 flowed through in scattering chamber unit 4, further production
Raw scattering light, after scattering light in the axial direction is entered in sunken optical trapping unit 5, it is irradiated on light refraction unit 12 and is dissipated
Penetrate, it scatters light and is blocked and eliminated by sunken optical trapping unit 5 and Qi Nei the first diaphragm unit 6；Scattering light in the axial direction
Measured chamber unit 7 reaches and produces electric signal on optical detecting unit 10.This electric signal passes to computer system unit 11
Afterwards, handled by further calculating, obtain the quantity of the suspended particulate substance 3 in current scattering chamber unit 4.Scatter in chamber unit 4
Quantity of the suspended particulate substance 3 within the unit interval directly affect the numerical value that computer system unit 11 measures.Due to anti-dazzling screen
The effect of blocking of unit 9, the light that the just length switchable light source cell 1 that now photo detector unit 10 detects is launched
After being irradiated to the suspended particulate substance 3 in scattering chamber unit 4, the scattering light of back scattering is carried out.
As shown in figure 3, in the present invention, optical shutter unit 8 is blocked at the second micropore, length switchable light source cell 1
After the light for launching a certain specific wavelength, it is irradiated on the equal filter unit 2 of scattering and produces diffusing scattering, these diffusion lights continue
It is irradiated to forward on optical shutter unit 8, produces strong light scattering, after scattering light in the axial direction is entered in sunken optical trapping unit 5,
It is irradiated on light refraction unit 12 and is scattered, it scatters light and carried out by sunken optical trapping unit 5 and Qi Nei the first diaphragm unit 6
Block and eliminate；The measured chamber unit 7 of scattering light in the axial direction reaches produces electric signal on optical detecting unit 10.This electricity
After signal passes to computer system unit 11, handled by further calculating, can obtain current length switchable light source cell 1
The luminous intensity of the light sent.The light that optical detecting unit 10 detects within the unit interval it is more with few, directly reflecting to cut
Change the strong with weak of the light-source brightness of wavelength light source unit 1, it is possible thereby to measure the light intensity of length switchable light source cell 1 with when
Between, the change of the factor such as temperature, and then measurement result is brought into calculating process, higher measurement accuracy can be obtained.
As shown in figure 4, in the present invention, it is equal that light is irradiated to scattering by length switchable light source cell 1 at an angle
On filter unit 2, then light is aimed downwardly suspended particulate substance 3 according to the first light border 14 and the second light border 15
On, mode that this increase scatters equal filter unit 2 can not only make the light that is aimed downwardly more uniform, light can also be allowed to shine
It is mapped on higher volume of particulate matter, that is, the angle on the first light border 14 and the second light border 15 can be bigger, and this
Kind angle becomes conference and produces more potent influence to measurement result.
As depicted in figs. 1 and 2, in the present invention, when having flowed through the under test gas of scattering chamber unit 4 for certain known gas or
When knowing the gas of its particle concentration, the numerical value of the corresponding opto-electronic conversion of the under test gas can be measured；It is another different when having
The gas stream of particle concentration is out-of-date, can measure one group of new corresponding measured value.By this two or more sets variable grain thing
The numerical value that the gas of concentration measures can be calibrated accordingly, draw corresponding relation formula, be further used for measuring unknown
The gas of particle concentration.
Compared with prior art, the advantages of the present invention are：
First, in the present invention, design scatters equal blade unit 2, the suspended particulate for making light fully be irradiated in scattering chamber unit 4
Thing 3, it is aided with peripheral gas circuit equipment, the under test gas containing suspended particulate substance 3 is passed through in real time in scattering chamber unit 4, while profit
With the Intelligent Measurement of computer system unit 11, multigroup measurement data can be drawn in 1 minute, there is higher real-time；
2nd, the present invention has very high concentration detecting capability, particle size size detection ability, visibility inspection simultaneously
Survey ability, it is practical；
3rd, the present invention has automatic zero point and punctuate calibration function, measures more accurate；
4th, the present invention does not need a large amount of consumptive materials, while does not need later period maintenance substantially yet, uses device structure simple,
Easy to operate, cost is relatively low.
As known by the technical knowledge, the present invention can pass through the embodiment party of other essence without departing from its spirit or essential feature
Case is realized.Therefore, embodiment disclosed above, for each side, all it is merely illustrative, is not only.Institute
Have within the scope of the present invention or be included in the invention in the change being equal in the scope of the present invention.
Claims (10)
- A kind of 1. detection means of air particle, it is characterised in that including：Length switchable light source cell (1), the length switchable light source cell (1) are used to launch light；Equal filter unit (2) is scattered, the equal filter unit (2) of scattering is located under the length switchable light source cell (1) Side, the equal filter unit (2) of scattering are used to carry out diffusing scattering to light, produce diffusion light；Chamber unit (4) is scattered, the scattering chamber unit (4) is located at the lower section of the length switchable light source cell (1) and is located at The downside of the equal filter unit (2) of scattering, is provided with the first micropore, described on the left surface of the scattering chamber unit (4) The right flank of scattering chamber unit (4) is provided with the second micropore, and under test gas has been flowed through in the scattering chamber unit (4), described Contain suspended particulate substance (3) under test gas；Light hydrazine unit (5) is fallen into, the sunken light hydrazine unit (5) is positioned at the left side of the scattering chamber unit (4), in the sunken light hydrazine list Light refraction unit (12) and the first diaphragm unit (6) are provided with first (5), the 3rd is provided with the first diaphragm unit (6) Micropore, the first diaphragm unit (6) is between first micropore and the light refraction unit (12), the sunken light hydrazine Unit (5) is used to eliminate veiling glare；Chamber unit (7) is measured, the measurement chamber unit (7) is positioned at the right side of the scattering chamber unit (4), in the measuring chamber list The second diaphragm unit (13) is provided with first (7), the 4th micropore is provided with the second diaphragm unit (13), described first is micro- In same level, the measurement chamber unit (7) is used for for hole, second micropore, the 3rd micropore, the 4th micropore Limit measurement volume and eliminate veiling glare；Optical detecting unit (10), the optical detecting unit (10) are connected with the measurement chamber unit (7)；Computer system unit (11), the computer system unit (11) are connected with the optical detecting unit (10).
- 2. the detection means of air particle according to claim 1, it is characterised in that also include：Shading blade unit (9), the shading blade unit (9) is rotatably provided in scattering chamber unit (4), and is located at the scattering The right-hand member of equal filter unit (2).
- 3. the detection means of air particle according to claim 1 or 2, it is characterised in that：Optical shutter unit (8) is movably installed with the measurement chamber unit (7), the optical shutter unit (8) is located at institute State the top of the second micropore.
- 4. the detection means of air particle according to claim 1 or 2, it is characterised in that：Pressure sensor is provided with the scattering chamber unit (4), for measuring the pressure of the under test gas, the pressure in real time Force snesor is connected with the computer system unit (11).
- 5. the detection means of air particle according to claim 1 or 2, it is characterised in that：Temperature sensor is provided with the scattering chamber unit (4), for measuring the temperature of the under test gas, the temperature in real time Degree sensor is connected with the computer system unit (11).
- 6. the detection means of air particle according to claim 1 or 2, it is characterised in that：Humidity sensor is provided with the scattering chamber unit (4), it is described wet for measuring the humidity of the under test gas in real time Degree sensor is connected with the computer system unit (11).
- 7. the detection means of air particle according to claim 1 or 2, it is characterised in that also include：Calibration module unit, the calibration module unit are connected with the computer system unit (11), for calibrating zero automatically Point and punctuate.
- 8. the detection means of air particle according to claim 1 or 2, it is characterised in that also include：Peripheral gas circuit equipment, the peripheral gas circuit equipment are connected with the scattering chamber unit (4), for the under test gas is real When be passed through in scattering chamber unit (4).
- 9. the detection method of the detection means of the air particle according to claim 1 to 8 any one, its feature exists In comprising the following steps：Step 1: the length switchable light source cell (1) launches the light of a certain specific wavelength, and it is irradiated to the scattering Diffusing scattering is carried out on equal filter unit (2), produces diffusion light；Step 2: the diffusion light is irradiated on the suspended particulate substance (3) flowed through in the scattering chamber unit (4), enter One step produces scattering light；Step 3: after direct projection is entered in the sunken light hydrazine unit (5) to the scattering light at non-measured end in the axial direction, light is irradiated to Learn and be scattered on refractive elements (12), its scatter light block by the first diaphragm unit (6) in sunken light hydrazine unit (5) and Eliminate；Step 4: scattering light in the axial direction is reached by the measurement chamber unit (7) and produced on the optical detecting unit (10) Electric signal；Step 5: the electric signal is transferred to the computer system unit (11), the scattering is obtained after calculating is handled The instant number of suspended particulate substance (3) in chamber unit (4).
- 10. detection method according to claim 9, it is characterised in that：In step 4, the second diaphragm unit (13) in the measurement chamber unit (7) carries out secondary elimination to scattering light.
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| CN109633897A (en) * | 2018-12-25 | 2019-04-16 | 中国科学院长春光学精密机械与物理研究所 | A kind of light trapping structure |
| CN111307677A (en) * | 2019-11-22 | 2020-06-19 | 北京雪迪龙科技股份有限公司 | Laser front scattering particulate matter monitoring device |
| CN111307676A (en) * | 2019-11-22 | 2020-06-19 | 北京雪迪龙科技股份有限公司 | Device and method for monitoring concentration of laser front scattering particulate matter |
| CN111735743A (en) * | 2020-07-24 | 2020-10-02 | 中国人民解放军国防科技大学 | Method for determining particle morphology of strong extinction biological material under target waveband |
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| CN113552033A (en) * | 2021-06-30 | 2021-10-26 | 杭州电子科技大学 | Dust concentration distribution detection method based on optical measurement |
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| CN109633897B (en) * | 2018-12-25 | 2020-06-12 | 中国科学院长春光学精密机械与物理研究所 | Optical trap structure |
| CN111307677A (en) * | 2019-11-22 | 2020-06-19 | 北京雪迪龙科技股份有限公司 | Laser front scattering particulate matter monitoring device |
| CN111307676A (en) * | 2019-11-22 | 2020-06-19 | 北京雪迪龙科技股份有限公司 | Device and method for monitoring concentration of laser front scattering particulate matter |
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