CN108709847A - A kind of air particles detection method and detection device - Google Patents
A kind of air particles detection method and detection device Download PDFInfo
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- CN108709847A CN108709847A CN201810648045.8A CN201810648045A CN108709847A CN 108709847 A CN108709847 A CN 108709847A CN 201810648045 A CN201810648045 A CN 201810648045A CN 108709847 A CN108709847 A CN 108709847A
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- 238000001514 detection method Methods 0.000 title claims abstract description 32
- 238000011144 upstream manufacturing Methods 0.000 claims description 15
- 230000031700 light absorption Effects 0.000 claims description 7
- 230000003287 optical effect Effects 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 2
- 239000006096 absorbing agent Substances 0.000 description 2
- 238000000149 argon plasma sintering Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000002356 laser light scattering Methods 0.000 description 1
- 239000000126 substance Substances 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
- G01N15/10—Investigating individual particles
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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
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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
- G01N2015/0003—Determining electric mobility, velocity profile, average speed or velocity of a plurality of particles
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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
- G01N15/10—Investigating individual particles
- G01N2015/1027—Determining speed or velocity of a particle
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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
- G01N15/10—Investigating individual particles
- G01N2015/1029—Particle size
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Abstract
The present invention discloses a kind of air particles detection method, it is characterized in that, the same position of gas flow is focused on using two different laser light sources of wavelength, in Mie scattering light intensity of the determining angle observation air particles particle under different wave length laser, it is to obtain the granular size of the air particles to two size mean values by being handled Mie scattering light intensity, being calculated the size for obtaining same air particles and being measured under two different wave lengths.The present invention can not only improve the precision of air particles granular size estimation, moreover, it is poor by comparing the size that same air particles measure under two different wave lengths, it can determine whether the air particles surface has moisture.The present invention also provides a kind of air particles detection devices.
Description
Technical field
The present invention relates to atmospheric sounding techniques field more particularly to a kind of air particles detection methods and detection device.
Background technology
Various particles, including various sizes of organic and inorganic substances are rich in air.For example PM2.5 is exactly that size is big
In the general name of 2.5 microns of air particles.It is a kind of means quickly detected to detect number of particles in air with laser light scattering.One
As in system containing there are one laser light sources.After in laser irradiation to particle, a part of light is dispersed into laterally.It is examined by light
Scattering light is surveyed, can be evaluated whether population and particle size.
Invention content
The purpose of the present invention is to provide a kind of air particles granular size estimation precision height and it can estimate gas flowing
Speed air particle detecting method.
The present invention also provides a kind of detection devices of the above-mentioned detection method of technology.
To achieve the above objectives, the present invention adopts the following technical scheme that.
A kind of air particles detection method, which is characterized in that focus on gas using two different laser light sources of wavelength
The same position of runner observes Mie scattering light intensity of the air particles particle under different wave length laser in a determining angle,
It is right by being handled Mie scattering light intensity, being calculated the size for obtaining same air particles and being measured under two different wave lengths
Two size mean values are to obtain the granular size of the air particles.
As a further illustration of the above scheme, being radiated at gas stream using two identical or different laser light sources of wavelength
The upstream and downstream different location in road, the flying distance between two different location of upstream and downstream determines, is passed by by same air particles
Signal time difference calculates the practical flight speed of air particles.
As a further illustration of the above scheme, the gas flow provides power by fan, estimated according to rotation speed of the fan
Same air particles pass through the time difference range of upstream and downstream different location, and pass through within the time difference and scattering light reaches pre-
Meter is identified the same air particles.
As a further illustration of the above scheme, the ruler measured under two different wave lengths by comparing same air particles
Very little difference judges whether the air particles surface has moisture.
As a further illustration of the above scheme, using the same light detecting device collectiong focusing same position two beams
The scattering light of different wave length laser tests the scattered light intensity under two kinds of different wave lengths by time sharing principle；Or, being examined using two light
Scattering light of the survey device difference collectiong focusing in two beam different wave length laser of same position.
A kind of air particles detection device, which is characterized in that including：
Air flow channel, for generating the moving air with air particles；
The different laser light source of at least two wavelength, the same position for focusing on the air flow channel；
Optical receiver apparatus is scattered, the life Mie scattering effect generated for receiving each position, and scattering light is carried out
Detection obtains the electric impulse signal that scattered light intensity generates；
Signal processing apparatus calculates the air grain for handling the electric impulse signal that scattered light intensity generates
The grain size and flying speed of son.
As a further illustration of the above scheme, being equipped with the wind of provided aerodynamic flow forces on the air flow channel
Fan.
As a further illustration of the above scheme, the air particles detection device includes identical two laser lights of wavelength
Source, identical two laser light sources of the wavelength are radiated at the upstream and downstream different location of the air flow channel.
Or, two wavelength it is different the laser light source rotational installation, by rotation make two wavelength it is different it is described swash
Radiant is irradiated in the upstream and downstream different location of the air flow channel respectively.
As a further illustration of the above scheme, the corresponding laser light source is equipped with light reflecting device and light absorption is equipped,
The light reflecting device, which will be equipped across the laser reflection of the air flow channel to light absorption, to be absorbed.
As a further illustration of the above scheme, the scattering optical receiver apparatus includes：Light detecting device and signal processing
Circuit, the light detecting device are photodiode or silicon photocell
The beneficial effects of the invention are as follows：
One, comprehensive detection is realized using the laser beam of two kinds of different wave lengths, it is big can not only improves air particles particle
The precision of small estimation, moreover, it is poor by comparing the size that same air particles measure under two different wave lengths, it can determine whether the sky
Whether gas particle surface has moisture.
Two, the time difference using air particles by upstream and downstream calculates the flying speed of air particles, can give outlet
The speed of body flowing.The estimation of this speed was determined with the operation of electric fan in the past.But the speed of electric fan is by many factors
Influence, such as voltage fluctuation.The present invention, can also accurate work in the environment of voltage change by directly measuring wind speed
Make.
Three, first according to rotation speed of the fan estimate same air particles pass through upstream and downstream different location time difference range, when
Between pass through in poor range and scatter light and reach estimated and be just identified the same air particles, same air grain is effectively provided
The accuracy that son judges.
Description of the drawings
Fig. 1 show air particles detection device partial structural diagram provided by the invention.
Fig. 2 show partial structural diagram of the air particles detection device provided by the invention on another visual angle.
Reference sign：
1：Air flow channel, 2：First laser light source, 3：Second laser light source, 4：Third laser light source, 5：Scatter light-receiving
Device, 6：Light reflecting device, 7：Light absorption is equipped.
Specific implementation mode
In the description of the present invention, it should be noted that " transverse direction ", " vertical if any term "center" for the noun of locality
To ", " length ", " width ", " thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top",
The indicating positions such as "bottom", "inner", "outside", " clockwise ", " counterclockwise " and position relationship are orientation based on ... shown in the drawings or position
Relationship is set, the narration present invention is merely for convenience of and simplifies description, device is not indicated or implied the indicated or element is necessary
It constructs and operates with specific orientation, with particular orientation, should not be understood as the specific protection domain of the limitation present invention.
In addition, being used for description purposes only if any term " first ", " second ", it is not understood to indicate or imply relatively heavy
The property wanted or the quantity for implicitly indicating technical characteristic." first " is defined as a result, " second " feature can be expressed or implicit include
One or more this feature, in the present description, " at least " are meant that one or more, unless otherwise clearly having
The restriction of body.
In the present invention, except as otherwise clear stipulaties and restriction, should make if any term " assembling ", " connected ", " connection " term
Broad sense goes to understand, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；Can also be that machinery connects
It connects；It can be directly connected, can also be to be connected by intermediary, can be connected inside two elements.For ability
For the those of ordinary skill of domain, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.
In invention, unless otherwise specified and limited, fisrt feature the "upper" of second feature or "lower" may include
First and second features are in direct contact, can also include fisrt feature and second feature not be in direct contact but by them it
Between other characterisation contact.Moreover, fisrt feature second feature " on ", " under " and " above " include fisrt feature
Right over two features and oblique upper, or be only to indicate that fisrt feature level height is higher than the height of second feature.Fisrt feature
Second feature " on ", " under " and " below " include that fisrt feature is directly under or diagonally below the second feature, or only table
Show that fisrt feature level height is less than second feature.
With reference to the attached drawing of specification, the specific implementation mode of the present invention is further described, makes the present invention's
Technical solution and advantage are clearer, clear.Embodiment is described below with reference to attached drawing to be exemplary, it is intended to solve
The present invention is released, and is not considered as limiting the invention.
Embodiment one
A kind of air particles detection method, which is characterized in that focus on gas using two different laser light sources of wavelength
The same position of runner observes Mie scattering light intensity of the air particles particle under different wave length laser in a determining angle,
By being handled Mie scattering light intensity, being calculated the ruler for obtaining same air particles and being measured under two different wave length laser
It is very little, it is to obtain the granular size of the air particles to two size mean values.Using this method, air particles can be not only improved
The precision of grain magnitude estimation, moreover, it is poor by comparing the size that same air particles measure under two different wave lengths, it can determine whether
Whether the air particles surface has moisture.
When detecting scattered light intensity, the same light detecting device collectiong focusing can be utilized in two beam difference waves of same position
The scattering light of long laser tests the scattered light intensity under two kinds of different wave lengths by time sharing principle.Two light detections can also be utilized
Device distinguishes collectiong focusing in the scattering light of two beam different wave length laser of same position, can only increase cost, but also keep away
The condition limitation of time-sharing work is exempted from.
Further, this method is also radiated at the upper and lower of gas flow using two identical or different laser light sources of wavelength
Different location is swum, the flying distance between two different location of upstream and downstream determines, the signal time to pass by by same air particles
Difference calculates the practical flight speed of air particles.
Air particles can be used for estimating the flight time by the scattered signal generated when runner upstream and downstream.Distance is removed
The speed of gas flowing can be then provided with the flight time.The estimation of this speed was determined with the operation of electric fan in the past.But
The speed of electric fan be it is affected by many factors, such as voltage fluctuation.The present embodiment is become by directly measuring wind speed in voltage
It can also accurate work in the environment of change.
Particularly, it is accurate judgement due to that can have multiple air particles to exist simultaneously in a laser focal beam spot
Successively whether the air particles Jing Guo upstream and downstream are same particle, first estimate same air particles by up and down according to rotation speed of the fan
Swim the time difference range of different location, it is passing through within the time difference and scatter light and reach estimated and be identified the same sky
Gas particle.
A kind of air particles detection method provided in this embodiment, using multiple laser light sources, the wherein wavelength (face of light source
Color) can be different, two light sources can focus on a position of air flow channel, can also be arranged in the different location of runner.
Using this means, the same particle can be not only detected by different wave length, to improve the essence of particle granules magnitude estimation
Degree；And the speed of particle movement can be directly measured, to the speed and volume that more directly estimation gas flows.
Embodiment two
As Figure 1-Figure 2, a kind of air particles detection device, which is characterized in that including：
Air flow channel 1, for generating the moving air with air particles.
Three laser light sources, wherein first laser light source 2 is identical with 3 wavelength of second laser light source, third laser light source 4
Wavelength it is different.First laser light source 2 focuses on the same position of air flow channel 1, first laser light source with third laser light source 4
2 are radiated at the different location of air flow channel 1 with second laser light source 3 respectively.It in other embodiments, can also be only with two
A wavelength difference laser light source, and two laser light sources are rotatablely installed, it is allowed to focus on the air flow channel by rotation
Same position or the different location for being irradiated in the air flow channel respectively, are not limited to the present embodiment.
Optical receiver apparatus 5 is scattered, the life Mie scattering effect generated for receiving each position, and scattering light is carried out
Detection obtains the electric impulse signal that scattered light intensity generates
Signal processing apparatus calculates the air grain for handling the electric impulse signal that scattered light intensity generates
The grain size and flying speed of son.
Wherein, the fan of provided aerodynamic flow forces is equipped on the air flow channel 1.The scattering optical receiver apparatus
5 include：Light detecting device and signal processing circuit, the light detecting device are photodiode or silicon photocell.Described in correspondence
Laser light source is equipped with light reflecting device 6 and light absorption equipment 7, and the light reflecting device 6 will be across the laser of the air flow channel
It is reflected to the absorption of light absorber device 7, avoids being reflected back original optical path.In other embodiments, periodical reflection dress can not also be set
It sets, but directly absorbs the light across air flow channel by light absorber device.
From the foregoing description of structures and principles it should be understood by those skilled in the art that, the present invention not office
It is limited to above-mentioned specific implementation mode, uses the improvement of techniques well known and replacement to all fall within this hair on the basis of the present invention
Bright protection domain, protection scope of the present invention should limit it by each claim and its equivalent.In specific implementation mode
The part not illustrated is the prior art or common knowledge.
Claims (10)
1. a kind of air particles detection method, which is characterized in that focus on gas stream using two different laser light sources of wavelength
The same position in road leads in Mie scattering light intensity of the determining angle observation air particles particle under different wave length laser
It crosses and Mie scattering light intensity is handled, calculates the size that the same air particles of acquisition measure under two different wave lengths, to two
A size mean value is to obtain the granular size of the air particles.
2. a kind of air particles detection method according to claim 1, which is characterized in that identical or not using two wavelength
Same laser light source is radiated at the upstream and downstream different location of gas flow, and the flying distance between two different location of upstream and downstream is true
Fixed, the signal time difference passed by by same air particles calculates the practical flight speed of air particles.
3. a kind of air particles detection method according to claim 2, which is characterized in that the gas flow is carried by fan
For power, the time difference range that same air particles pass through upstream and downstream different location is estimated according to rotation speed of the fan, in time difference model
It enclose interior process and scatters light and reaches estimated and be identified the same air particles.
4. a kind of air particles detection method according to claim 1, which is characterized in that by comparing same air particles
The size difference measured under two different wave lengths judges whether the air particles surface has moisture.
5. a kind of air particles detection method according to claim 1, which is characterized in that utilize the same light detecting device
Collectiong focusing is tested by time sharing principle under two kinds of different wave lengths in the scattering light of two beam different wave length laser of same position
Scattered light intensity；
Or, using two light detecting devices distinguish collectiong focusings two beam different wave length laser of same position scattering light.
6. a kind of air particles detection device, which is characterized in that including：
Air flow channel, for generating the moving air with air particles；
The different laser light source of at least two wavelength, the same position for focusing on the air flow channel；
Optical receiver apparatus is scattered, the life Mie scattering effect generated for receiving each position, and scattering light is detected,
Obtain the electric impulse signal that scattered light intensity generates；
Signal processing apparatus calculates the air particles for handling the electric impulse signal that scattered light intensity generates
Grain size and flying speed.
7. a kind of air particles detection device according to claim 6, which is characterized in that be equipped on the air flow channel
The fan of provided aerodynamic flow forces.
8. a kind of air particles detection device according to claim 6, which is characterized in that further include that wavelength is two identical
Laser light source, identical two laser light sources of the wavelength are radiated at the upstream and downstream different location of the air flow channel；
Or, the laser light source rotational installation that two wavelength are different, by rotating the laser light for keeping two wavelength different
Source is irradiated in the upstream and downstream different location of the air flow channel respectively.
9. a kind of air particles detection device according to claim 6, which is characterized in that the corresponding laser light source is equipped with
Light reflecting device and light absorption equipment, the light reflecting device will be equipped across the laser reflection of the air flow channel to light absorption
It absorbs.
10. a kind of air particles detection device according to claim 6, which is characterized in that the scattering optical receiver apparatus
Including：Light detecting device and signal processing circuit, the light detecting device are photodiode or silicon photocell.
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| CN201810648045.8A CN108709847A (en) | 2018-06-22 | 2018-06-22 | A kind of air particles detection method and detection device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109632589A (en) * | 2018-12-30 | 2019-04-16 | 江苏苏净集团有限公司 | A kind of Atmospheric particulates detection device and method |
| CN112903547A (en) * | 2019-11-19 | 2021-06-04 | 南京理工大学 | High-concentration cloud and mist particle concentration measuring device based on double light sources |
| WO2022064273A1 (en) * | 2020-09-28 | 2022-03-31 | Rockley Photonics Limited | Optical sensing module |
| CN114324095A (en) * | 2021-12-30 | 2022-04-12 | 中国石油大学(北京) | Monitoring device for concentration of particle impurities in gas pipeline |
| CN116297065A (en) * | 2023-03-20 | 2023-06-23 | 上海幸励科技有限公司 | System and method for measuring sample particles in gas feed stream |
| US11766216B2 (en) | 2019-12-11 | 2023-09-26 | Rockley Photonics Limited | Optical sensing module |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109632589A (en) * | 2018-12-30 | 2019-04-16 | 江苏苏净集团有限公司 | A kind of Atmospheric particulates detection device and method |
| CN109632589B (en) * | 2018-12-30 | 2024-03-12 | 江苏苏净集团有限公司 | Atmospheric particulate detection device and method |
| CN112903547A (en) * | 2019-11-19 | 2021-06-04 | 南京理工大学 | High-concentration cloud and mist particle concentration measuring device based on double light sources |
| CN112903547B (en) * | 2019-11-19 | 2023-01-03 | 南京理工大学 | High-concentration cloud and mist particle concentration measuring device based on double light sources |
| US11766216B2 (en) | 2019-12-11 | 2023-09-26 | Rockley Photonics Limited | Optical sensing module |
| WO2022064273A1 (en) * | 2020-09-28 | 2022-03-31 | Rockley Photonics Limited | Optical sensing module |
| CN114324095A (en) * | 2021-12-30 | 2022-04-12 | 中国石油大学(北京) | Monitoring device for concentration of particle impurities in gas pipeline |
| CN114324095B (en) * | 2021-12-30 | 2023-10-24 | 中国石油大学(北京) | Monitoring device for particle impurity concentration in gas pipeline |
| CN116297065A (en) * | 2023-03-20 | 2023-06-23 | 上海幸励科技有限公司 | System and method for measuring sample particles in gas feed stream |
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