CN106066310A - A kind of aerosol phase function observation system and observation procedure thereof - Google Patents
A kind of aerosol phase function observation system and observation procedure thereof Download PDFInfo
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- CN106066310A CN106066310A CN201610393228.0A CN201610393228A CN106066310A CN 106066310 A CN106066310 A CN 106066310A CN 201610393228 A CN201610393228 A CN 201610393228A CN 106066310 A CN106066310 A CN 106066310A
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/06—Illumination; Optics
- G01N2201/061—Sources
- G01N2201/06113—Coherent sources; lasers
Abstract
The invention discloses a kind of aerosol phase function observation system and observation procedure thereof.The aerosol phase function observation system of the present invention includes: laser emission element, ligh trap, scopometer, scattered signal receptor and computer；Scopometer is installed in the lower section of laser beam, measures and obtain aerosol hemisphere backscattering coefficient；On the side of laser beam and the position identical with laser beam height, scattered signal receptor is installed；The present invention use signal that CCD camera obtains and scopometer measurement to aerosol hemisphere backscattering coefficient be combined, obtain aerosol phase function, the scattered information of different angles can be obtained, it is to avoid result is impacted by aerosol scattering character over time simultaneously；The observation system of the present invention is simple and effective, and cost is relatively low, and the observation for aerosol phase function provides new technological means, and the inverting for remote sensing observations aerosol optical characteristics pertinent instruments provides support.
Description
Technical field
The present invention relates to atmospheric sounding techniques, be specifically related to a kind of aerosol phase function observation system and observation procedure thereof.
Background technology
Aerosol is suspended in the fine particle in air, is generally called as Atmospheric particulates.When radiation is greatly
In gas during transmission, to be scattered by the different component such as gas, aerosol in air, its intensity, transmission direction and polarization shape
States etc. all can produce change.In most cases, owing to solar radiation is nature light, the scattered light in air is divided axisymmetricly
Cloth.Therefore, this distribution can describe by single plane angle, 0 degree of forward direction representing that scattered light is consistent with incident illumination direction
Scattering, 180 degree of back scattering representing that scattered light is in opposite direction with incident illumination, the angle between scattered light and incident illumination is scattered
Firing angle.Phase function is defined as the physical quantity of the distribution describing scattered light intensity in different angle of scatterings.
In recent years, there are some researchs to build the instrument of observation aerosol phase function, and carried out laboratory experiment and outfield
Observation experiment.The light source that these instruments are used is all laser, because only that the little laser of dispersion angle can meet measurement
The needs of phase function.
The first design, is to be installed on the robotic arm by a photomultiplier tube so that it is in laser institute planar around light
A little rotating in road, to receive the scattered signal of different angle of scattering；The second design is to make gas circuit be perpendicular to light path, and crosses
In a bit, then planar installing a lot of photodiodes around this point at laser, each photodiode receives
The scattered signal of different angle of scatterings；The third design is by placement two sides, light path side parabolic type reflecting mirror, allowing same
Point converges at new a bit to the light of different angles scattering after two-face mirror again.One side is placed rotating at this point
Flat mirror, by rotating the angle of this mirror, reflexes to the scattered signal of different angle of scatterings in photomultiplier tube；4th kind of design is
In an ellipsoidal mirror, STH makes light path pass, and scatters to the light on ellipsoidal mirror after reflection, arrives through a pipeline
Reach photomultiplier tube, and by rotating this pipeline, the scattered light signal of different angle of scattering can be made to arrive photoelectricity times after reflection
Increase in pipe.These, about the research of aerosol phase function, have plenty of and are tested particulate in laboratory, have
It is to be big water dust and ice crystal for observing particle diameter far beyond particulate in aircraft observation, and not used for aerosol outfield
In observation.
Summary of the invention
For above the deficiencies in the prior art, the present invention propose a kind of aerosol phase function observation system and
Observation procedure, detection different angles aerosol scattering light is to obtain aerosol phase function simultaneously, reduces system complexity and drops simultaneously
Low instrument cost.
It is an object of the present invention to propose a kind of aerosol phase function observation system.
The aerosol phase function observation system of the present invention includes: laser emission element, ligh trap, scopometer, scattered signal connect
Receive device and computer；Wherein, laser emission element launches the continuous laser of horizontal direction；End at laser beam installs light
Trap, to absorb residue laser；Install scopometer in the lower section of laser beam, turbidimetric air inlet alignment laser beam, measurement obtains
Aerosol hemisphere backscattering coefficient；On the side of laser beam and the position identical with laser beam height, scattered signal is installed to connect
Receive device；Scattered signal receptor includes wide-angle lens, Excitation Filter with High and CCD camera, and wide-angle lens is by laser beam in the range of width
Gas and the scattered light of aerosol scattering in air converge, and after Excitation Filter with High filters, CCD camera receive optical signal
And it is converted into the signal of telecommunication；Scopometer and CCD camera are respectively connecting to computer；The signal that CCD camera obtains is measured with scopometer
The aerosol hemisphere backscattering coefficient arrived combines, and obtains aerosol phase function.
Laser emission element includes solid state laser and frequency-doubling crystal；Solid state laser uses solid laser material as sending out
Stimulative substance, the laser sent becomes the laser of frequency multiplication after frequency-doubling crystal, and laser beam sends in the horizontal direction.
Wide-angle lens, Excitation Filter with High and CCD camera constitute scattered signal receptor, and Excitation Filter with High is arranged on wide-angle lens
Between head and CCD camera；Wide-angle lens uses solid angle and its area shared on picture of isometric projection method, i.e. subject
It is directly proportional, the scattered light in the range of width is converged；The unwanted background signal of data analysis is filtered through Excitation Filter with High；By
CCD camera receives and converges the laser beam come through the scattered light signal of atmospheric scattering imaging through wide-angle lens, every in CCD camera
Individual pixel produces electric charge after receiving photon respectively, and is converted into the signal of telecommunication.
Laser emission element launches parallel continuous laser, and laser beam enters ligh trap after one section of light path；At laser
The side of bundle, the position contour with laser beam is placed scattered signal receptor, the direction of alignment laser beam, is utilized light scattering principle
Scattered light signal is caught with CCD image-forming principle；After converting optical signals into the signal of telecommunication, transmission, to computer, completes imaging
Control and the acquisition of signal；The aerosol hemisphere backscattering coefficient obtained with scopometer measurement again combines, and then obtains gas
Colloidal sol phase function.
A kind of aerosol phase function observation procedure of offer is provided.
The aerosol phase function observation procedure of the present invention, comprises the following steps:
1) gather a spacer image, i.e. block CCD camera with baffle plate and detect；
2) open laser instrument, open baffle plate and carry out image acquisition, read the gradation data of each pixel on image, then subtract
Remove the gradation data that spacer image is corresponding, obtain the laser beam the removing dark current noise image through the scattered light of atmospheric scattering,
Air includes gas and aerosol；
3) central shaft of the image of linear fitting matching scattered light is used；
4) scatteringangleθ through the scattered light of atmospheric scattering of the laser beam corresponding to each pixel on central shaft is obtained；
5) central shaft matching obtained is divided into multiple shelves with a pixel for step-length, and each grade of corresponding pixel does
It is perpendicular to central shaft the line segment with the pixel on this central shaft as midpoint, selects suitable line segment length to make and laser
The signal that the scattered light of bundle is relevant can be included by these pixels, obtains the ash that each pixel is corresponding in line segment
Angle value, uses normal distyribution function to be fitted the gray value of each grade, obtains the scattered light of air corresponding to each pixel
Signal intensity；
6) according to angle of scattering and the scattered light signal intensity of air of the scattered light corresponding to each pixel, air is obtained
Scattered light signal intensity with the change I (θ) of angle of scattering；
7) the aerocolloidal signal intensity change I with angle of scattering is obtainedaero(θ)；；
8) to aerocolloidal signal intensity with the change I of angle of scatteringaero(θ) it is normalized, obtains aerocolloidal phase letter
Number.
Wherein, in step 4) in, obtain the scattering through atmospheric scattering of the laser beam corresponding to each pixel on central shaft
Scattering of light angle, specifically includes following steps:
A) adjust the angle of CCD camera so that laser beam through the image of the scattered light of atmospheric scattering through the picture of CCD camera
The central point of prime matrix；
B) using object of reference method to mark laser beam through the angle of scattering of the scattered light of atmospheric scattering is 90 ° of corresponding figure image positions
Put；
C) according to the picture position that central point is corresponding with 90 ° of angle of scatterings, in conjunction with the focal distance f of wide-angle lens, central point is calculated
Corresponding laser beam is through the angle of scattering of the scattered light of atmospheric scattering；
D) according to picture position corresponding to the angle of scattering corresponding to central point, 90 ° of angle of scatterings and the focal length of wide-angle lens
F, extrapolates whole laser beam corresponding relation of position in the angle of scattering and image of the scattered light of atmospheric scattering, thus obtains every
The angle of scattering of the scattered light of the laser beam corresponding to individual pixel.
In step 5) in, normal distyribution function meets:
Wherein, x is the pixel coordinate being perpendicular in the line segment of central shaft, and μ is the coordinate at line segment midpoint, and (x-μ) is
In line segment, each pixel is to the distance at midpoint, and σ is the standard deviation of normal distribution, I0The sky background received for CCD camera
Spoke brightness, and the signal intensity of the scattered light of laser beam corresponding at this line segment is I.
In step 7) in, obtain the aerocolloidal signal intensity change I with angle of scatteringaero(θ) comprise the following steps:
A) scopometer measurement is used to obtain aerosol hemisphere backscattering coefficient, bound gas hemisphere backscattering coefficient,
Obtain the ratio of aerosol and the hemisphere backscattering coefficient of gas；
B) in hemisphere, the backscatter signal of different angles is integrated, after obtaining gas and aerocolloidal total hemisphere
To the integrated intensity of scattered signal；
C) integrated intensity of total hemisphere backscatter signal is multiplied by the ratio of aerosol and the hemisphere backscattering coefficient of gas
Value, obtains the integrated intensity of gas hemisphere backscatter signal；
D) Scattering Phase Function of the gas under the known surface pressure of combination, obtains the signal intensity of gas with angle of scattering
Change Iair(θ), the scattered light signal intensity of air with the change I (θ) of angle of scattering and the signal intensity of gas with the change of angle of scattering
Change Iair(θ) difference, is the aerocolloidal signal intensity change I with angle of scatteringaero(θ)。
In step 8) in, aerocolloidal signal intensity is with the change I of angle of scatteringaero(θ) with aerocolloidal scattering function βaero
(θ) meet:
Iaero(θ)=N0βaero(θ)
Wherein, N0It is definite value for systematic parameter, βaero(θ) it is scattering function corresponding at scatteringangleθ, βaero(θ) with
Iaero(θ) being directly proportional, aerocolloidal phase function is the distribution with angle of the scattering function after normalization, therefore to Iaero(θ) carry out
Aerocolloidal phase function is can be obtained by after normalization.
Advantages of the present invention:
The aerosol hemisphere backscattering coefficient knot that the signal that the present invention uses CCD camera to obtain arrives with scopometer measurement
Close, obtain aerosol phase function, the scattered information of different angles can be obtained simultaneously, it is to avoid aerosol scattering character is in time
Change result is impacted；The observation system of the present invention is simple and effective, and cost is relatively low, for the observation of aerosol phase function
Providing new technological means, the inverting for remote sensing observations aerosol optical characteristics pertinent instruments provides support.
Accompanying drawing explanation
Fig. 1 is the side view of the aerosol phase function observation system of the present invention；
Fig. 2 is the top view of the aerosol phase function observation system of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawings, by specific embodiment, the present invention is expanded on further.
As depicted in figs. 1 and 2, the aerosol phase function observation system of the present embodiment includes: laser emission element A, ligh trap
D, scopometer C, scattered signal receptor B and computer；Wherein laser emission element A launches the continuous laser of horizontal direction,
End at laser beam installs ligh trap D, to absorb residue laser；Scopometer C, turbidimetric air inlet are installed in the lower section of laser beam
Mouth C1 is directed at laser beam, measures and obtains aerosol hemisphere backscattering coefficient；At the side of laser beam and and laser beam height
Scattered signal receptor B is installed in identical position；Scattered signal receptor B includes wide-angle lens B1, Excitation Filter with High B2 and CCD
Laser beam in the range of width is converged by camera B3, wide-angle lens B1 through the scattered light of air, after Excitation Filter with High B2 filters, by
CCD camera B3 receives optical signal and is converted into the signal of telecommunication；Scopometer C and CCD camera B3 are respectively connecting to computer.
In the present embodiment, the laser instrument of laser emission element uses solid laser material, launches continuous laser, launches wavelength
It is 1064 nanometers；The laser beam of 532 nano wave lengths is sent after frequency multiplication；Laser beam sends in the horizontal direction.
The aerosol phase function observation procedure of the present embodiment, comprises the following steps:
1) gather a spacer image, i.e. block CCD camera with baffle plate and detect.
2) open laser instrument, open baffle plate and carry out image acquisition, read the gradation data of each pixel on image, then subtract
Remove the gradation data that spacer image is corresponding, obtain the laser beam removing dark current and the noise figure through the scattered light of atmospheric scattering
Picture, air includes gas and aerosol.
3) central shaft of the image of the scattered light of linear fitting matching laser beam is used.
4) scatteringangleθ of the scattered light of the laser beam corresponding to each pixel on central shaft is obtained:
A) adjust the angle of CCD camera so that laser beam through the image of the scattered light of atmospheric scattering through the picture of CCD camera
The central point of prime matrix；
B) using object of reference method to mark laser beam through the angle of scattering of the scattered light of atmospheric scattering is 90 ° of corresponding figure image positions
Put；
C) according to the picture position that central point is corresponding with 90 ° of angle of scatterings, in conjunction with the focal distance f of wide-angle lens, central point is calculated
Corresponding laser beam is through the angle of scattering of the scattered light of atmospheric scattering；
D) according to picture position corresponding to the angle of scattering corresponding to central point, 90 ° of angle of scatterings and the focal length of wide-angle lens
F, extrapolates angle of scattering and the corresponding relation of position on image of the scattered light of whole laser beam, thus it is right to obtain each pixel institute
The scatteringangleθ of the scattered light of the laser beam answered.
5) central shaft matching obtained is divided into multiple shelves with a pixel for step-length, and each grade of corresponding pixel does
It is perpendicular to central shaft the line segment with the pixel on this central shaft as midpoint, selects suitable line segment length to make and laser beam
The relevant signal of scattered light can be included by these pixels, obtain the gray scale that each pixel is corresponding in line segment
Value, uses normal distyribution function to be fitted the gray value of each grade, obtains the scattered light letter of air corresponding to each pixel
Number intensity, normal distyribution function meets:
Wherein, x is the pixel coordinate being perpendicular in the line segment of central shaft, and μ is the coordinate at line segment midpoint, and (x-μ) is
In line segment, each pixel is to the distance at midpoint, and σ is the standard deviation of normal distribution, I0The sky background received for CCD camera
Spoke brightness, and the signal intensity of the scattered light of laser beam corresponding at this line segment is I.
6) according to angle of scattering and the scattered light signal intensity of air of scattered light corresponding to every grade of pixel, signal is obtained
Intensity is with the change I (θ) of angle of scattering.
7) the aerocolloidal signal intensity change I with angle of scattering is obtainedaero(θ):
A) scopometer measurement is used to obtain aerosol hemisphere backscattering coefficient, bound gas hemisphere backscattering coefficient,
Obtain the ratio of aerosol and the hemisphere backscattering coefficient of gas；
B) in hemisphere, the backscatter signal of different angles is integrated, after obtaining gas and aerocolloidal total hemisphere
To the integrated intensity of scattered signal；
C) integrated intensity of total hemisphere backscatter signal is multiplied by the ratio of aerosol and the hemisphere backscattering coefficient of gas
Value, obtains the integrated intensity of gas hemisphere backscatter signal；
D) Scattering Phase Function of the gas under the known surface pressure of combination, obtains the signal intensity of gas with angle of scattering
Change Iair(θ), the scattered light signal intensity of air with the change I (θ) of angle of scattering and the signal intensity of gas with the change of angle of scattering
Change Iair(θ) difference, is the aerocolloidal signal intensity change I with angle of scatteringaero(θ)。
8) aerocolloidal signal intensity is with the change I of angle of scatteringaero(θ) with aerocolloidal scattering function βaero(θ) meet:
Iaero(θ)=N0βaero(θ)
Wherein, N0It is definite value for systematic parameter, βaero(θ) it is scattering function corresponding at scatteringangleθ, βaero(θ) with
Iaero(θ) being directly proportional, aerocolloidal phase function is the distribution with angle of the scattering function after normalization, therefore to Iaero(θ) carry out
The aerocolloidal phase function aerocolloidal signal intensity change I with angle of scattering is can be obtained by after normalizationaero(θ) normalizing is carried out
Change, obtain aerocolloidal phase function.
It is finally noted that, publicize and implement the purpose of example and be that help is further appreciated by the present invention, but this area
Those of skill will appreciate that: without departing from the spirit and scope of the invention and the appended claims, various replacements and repairing
It is all possible for changing.Therefore, the present invention should not be limited to embodiment disclosure of that, and the scope of protection of present invention is with power
Profit claim defines in the range of standard.
Claims (7)
1. an aerosol phase function observation system, it is characterised in that described aerosol phase function observation system includes: laser is sent out
Penetrate unit, ligh trap, scopometer, scattered signal receptor and computer；Wherein, described laser emission element launches horizontal direction
Continuous laser；End at laser beam installs ligh trap, to absorb residue laser；Scopometer is installed in the lower section of laser beam, turbid
The air inlet alignment laser beam of degree meter, measures and obtains aerosol hemisphere backscattering coefficient；On the side of laser beam and with sharp
Scattered signal receptor is installed in the position that beam heights is identical；Described scattered signal receptor includes that wide-angle lens, laser filter
Sheet and CCD camera, the scattered light of laser beam gas in air and aerosol scattering is converged, filters through laser by wide-angle lens
After sheet filters, CCD camera receive optical signal and be converted into the signal of telecommunication；Described scopometer and CCD camera are respectively connecting to calculate
Machine；The signal that described CCD camera obtains and scopometer measurement to aerosol hemisphere backscattering coefficient be combined, obtain aerosol
Phase function.
2. aerosol phase function observation system as claimed in claim 1, it is characterised in that described laser emission element includes solid
Body laser and frequency-doubling crystal；Described solid state laser uses solid laser material to pass through as luminescent substance, the laser sent
The laser of frequency multiplication is become after frequency-doubling crystal.
3. an aerosol phase function observation procedure, it is characterised in that described aerosol phase function observation procedure includes following step
Rapid:
1) gather a spacer image, i.e. block CCD camera with baffle plate and detect；
2) open laser instrument, open baffle plate and carry out image acquisition, read the gradation data of each pixel on image, then deduct dark
The gradation data that two field picture is corresponding, obtains the laser beam the removing dark current noise image through the scattered light of atmospheric scattering, air
Including gas and aerosol；
3) central shaft of the image of linear fitting matching scattered light is used；
4) scatteringangleθ of scattered light corresponding to each pixel on central shaft is obtained；
5) central shaft matching obtained is divided into multiple shelves with a pixel for step-length, each grade of corresponding pixel does vertical
In central shaft the line segment with the pixel on this central shaft as midpoint, suitable line segment length is selected to make and the dissipating of laser beam
Penetrate the relevant signal of light to be included by these pixels, obtain the gray value that each pixel is corresponding in line segment,
Using normal distyribution function to be fitted the gray value of each grade, the scattered light signal obtaining air corresponding to each pixel is strong
Degree；
6) according to angle of scattering and the scattered light signal intensity of air of the scattered light corresponding to each pixel, dissipating of air is obtained
Penetrate the light signal strength change I (θ) with angle of scattering；
7) the aerocolloidal signal intensity change I with angle of scattering is obtainedaero(θ)；
8) to aerocolloidal signal intensity with the change I of angle of scatteringaero(θ) it is normalized, obtains aerocolloidal phase function.
4. aerosol phase function observation procedure as claimed in claim 3, it is characterised in that in step 4) in, obtain central shaft
On the laser beam corresponding to each pixel through the angle of scattering of the scattered light of atmospheric scattering, specifically include following steps:
A) adjust the angle of CCD camera so that laser beam through the image of the scattered light of atmospheric scattering through the pixel square of CCD camera
The central point of battle array；
B) using object of reference method to mark laser beam through the angle of scattering of the scattered light of atmospheric scattering is 90 ° of corresponding picture positions；
C) according to the picture position that central point is corresponding with 90 ° of angle of scatterings, in conjunction with the focal distance f of wide-angle lens, calculate that central point institute is right
The laser beam answered is through the angle of scattering of the scattered light of atmospheric scattering；
D) according to picture position corresponding to the angle of scattering corresponding to central point, 90 ° of angle of scatterings and the focal distance f of wide-angle lens, push away
Calculate whole laser beam corresponding relation of position in the angle of scattering and image of the scattered light of atmospheric scattering, thus obtain each picture
The angle of scattering of the scattered light corresponding to element.
5. aerosol phase function observation procedure as claimed in claim 3, it is characterised in that in step 5) in, normal distribution letter
Number meets:
Wherein, x is the pixel coordinate being perpendicular in the line segment of central shaft, and μ is the coordinate at line segment midpoint, and (x-μ) is line segment
Interior each pixel is to the distance at midpoint, and σ is the standard deviation of normal distribution, I0The sky background spoke received for CCD camera is bright
Degree, and the signal intensity of the scattered light of laser beam corresponding at this line segment is I.
6. aerosol phase function observation procedure as claimed in claim 3, it is characterised in that in step 7) in, obtain aerosol
Signal intensity with the change I of angle of scatteringaero(θ) comprise the following steps:
A) use scopometer measurement to obtain aerosol hemisphere backscattering coefficient, bound gas hemisphere backscattering coefficient, obtain
The ratio of the hemisphere backscattering coefficient of aerosol and gas；
B) in hemisphere, the backscatter signal of different angles is integrated, obtains gas and aerocolloidal total hemisphere is backward scattered
Penetrate the integrated intensity of signal；
C) integrated intensity of total hemisphere backscatter signal is multiplied by the ratio of aerosol and the hemisphere backscattering coefficient of gas,
Integrated intensity to gas hemisphere backscatter signal；
D) Scattering Phase Function of the gas under the known surface pressure of combination, obtains the signal intensity change with angle of scattering of gas
Iair(θ), the scattered light signal intensity of air with the change I (θ) of angle of scattering and the signal intensity of gas with the change of angle of scattering
Iair(θ) difference, is the aerocolloidal signal intensity change I with angle of scatteringaero(θ)。
7. aerosol phase function observation procedure as claimed in claim 3, it is characterised in that in step 8) in, aerocolloidal letter
Number intensity is with the change I of angle of scatteringaero(θ) with aerocolloidal scattering function βaero(θ) meet:
Iaero(θ)=N0βaero(θ)
Wherein, N0It is definite value for systematic parameter, βaero(θ) it is scattering function corresponding at scatteringangleθ, βaero(θ) and Iaero(θ)
Being directly proportional, aerocolloidal phase function is the distribution with angle of the scattering function after normalization, to IaeroAfter (θ) being normalized
To aerocolloidal phase function.
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| CN107389552A (en) * | 2017-06-28 | 2017-11-24 | 南京信息工程大学 | Utilize the method for white-light optics imaging measurement atmospheric aerosol white-light optics parameter |
| CN107741592A (en) * | 2017-09-26 | 2018-02-27 | 北京大学 | A kind of more optical characteristics remote sensing observing systems of aerosol and its observation procedure |
| CN107741592B (en) * | 2017-09-26 | 2019-08-13 | 北京大学 | A kind of more optical characteristics remote sensing observing systems of aerosol and its observation method |
| CN108362666A (en) * | 2017-12-29 | 2018-08-03 | 中国人民解放军陆军炮兵防空兵学院 | Scan-type aerosol detection device near the ground based on CCD |
| CN110286069A (en) * | 2019-07-26 | 2019-09-27 | 佛山科学技术学院 | A kind of Atmospheric particulates scattering observation device |
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