CN108593528A - Aspherical coarse particles shape and size measurement method based on laser interference - Google Patents
Aspherical coarse particles shape and size measurement method based on laser interference Download PDFInfo
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- CN108593528A CN108593528A CN201810372404.1A CN201810372404A CN108593528A CN 108593528 A CN108593528 A CN 108593528A CN 201810372404 A CN201810372404 A CN 201810372404A CN 108593528 A CN108593528 A CN 108593528A
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- 239000011362 coarse particle Substances 0.000 title claims abstract description 14
- 238000000691 measurement method Methods 0.000 title claims abstract description 8
- 239000002245 particle Substances 0.000 claims abstract description 54
- 238000003384 imaging method Methods 0.000 claims abstract description 22
- 230000001788 irregular Effects 0.000 claims abstract description 4
- 238000004458 analytical method Methods 0.000 claims abstract description 3
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- 235000013399 edible fruits Nutrition 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 6
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- 101100117236 Drosophila melanogaster speck gene Proteins 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
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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
- G01N15/10—Investigating individual particles
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- G01N2015/1022—
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- G01N2015/1029—
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- G01N2015/103—
Abstract
The aspherical coarse particles shape and size measurement method based on laser interference that the present invention relates to a kind of, includes the following steps：Laser interference imaging double-optical path system is built, KPT Scatter light is received simultaneously with two CCD；Image enhancement is carried out to the focusing picture of the first CCD records, obtains the shape information of particle；2D auto-correlation computations are done to the defocused image of the 2nd CCD records and obtain the 2D autocorrelogram pictures of defocused image, the minimum dimension direction for finding 2D autocorrelogram inconocenter specks determines full-size and the direction of particle, and the size of calculating and its perpendicular direction particle, according to the relationship between defocused image 2D autocorrelograms picture and particle size, it determines particle size, finally obtains the dimension information of particle.Comprehensive analysis shape information and dimension information provide the interference imaging measurement result of irregular granules shape and size.
Description
Technical field
The present invention specifically proposes the aspherical coarse particles shape and size that double reception light path is imaged based on laser interference
Measurement method, belong to field of optical measurements.
Background technology
Particle Field parameter measurement throughout it is many industry and research fields, such as agricultural, mining industry, food, chemical industry, building materials, metallurgy,
Machinery, medicine etc..Particle shape during generation, movement, collision etc. can change, and the particle of irregular shape is deposited extensively
It is to affect production and living, industry manufacture etc. in Particle Field, therefore is also of great significance to the research of nonspherical particle.Swash
Interference of light imaging is a kind of real-time, quick, non-contacting particle measurement technology, which has compared the research of spheroidal particle
It is ripe.But the scattering light characteristic of aspherical coarse particles also includes its shape and size information, therefore laser interference imaging technique
It is a kind of effective ways for obtaining aspherical coarse particles shape and size information.
Research for nonspherical particle, patent CN105866013A disclose it is a kind of based on two width laser interferences be imaged from
The spheroidal particle judgement system and method for burnt interference pattern.This method is worked asynchronously using laser interference image-forming principle with two CCD,
The defocus interference pattern for receiving polarization direction and the KPT Scatter light identical and vertical with incident light respectively, utilizes the polarizer, analyzing
Device adjusts the angle in scatter light polarization direction and incident light polarization direction, is realized to spheroidal particle according to the difference of two images
Differentiate and measure, to show whether particle is spherical conclusion.Patent CN106092859A discloses a kind of based on laser interference
The shape of particle judgement system and method for imaging and in-line holographic.This method has built laser interference imaging and in-line holographic imaging
Double beam system.Particle is illuminated using sheet laser beam, the different dry formed in defocus image planes by observing KPT Scatter light
Relate to the shape that bar graph infers particle.Another light path system obtain the in-line hologram for interfering particle and to hologram into
Row is rebuild and obtains the profile of particle.Then holographic reconstruction figure is matched to obtain accurately with corresponding particle interference fringe picture
Shape of particle judging result.Patent CN104807738A discloses a kind of single particulate real-time detection method and detection fills
It sets, analyzing processing is carried out by the forward direction and lateral scattering pattern of single aerosol particles in synchronous acquisition air, can be differentiated
Grain size is less than 2.5 μm of shape of particle.
Invention content
The present invention proposes a kind of measurement method providing aspherical coarse particles shape and size, is adopted using double beam system
The focusing picture and speckle image of the particle collected are realized to the judgement of coarse particles shape and the measurement of size.The present invention carries
The technical solution gone out is as follows：
A kind of aspherical coarse particles shape and size measurement method based on laser interference, includes the following steps：
I, laser interference imaging double-optical path system is built, KPT Scatter light, the first CCD are received simultaneously with two CCD
Positioned at the focusing image planes of imaging system, the focusing picture of particle is received, the 2nd CCD is located at the defocus image planes of imaging system, receives grain
The interference defocused image of son；
Ii, image enhancement is carried out to the focusing picture of the first CCD records, obtains the shape information of particle；2nd CCD is recorded
Defocused image do 2D auto-correlation computations and obtain the 2D autocorrelogram pictures of defocused image, find the minimum of 2D autocorrelogram inconocenter specks
Dimensional directions determine full-size and the direction of particle, and calculate the size with its perpendicular direction particle, according to defocused image 2D
Relationship between autocorrelogram picture and particle size determines particle size, finally obtains the dimension information of particle；
Iii, comprehensive analysis shape information and dimension information, the interference imaging for providing irregular granules shape and size measure
As a result.
Preferably, the light of laser transmitting becomes after being compressed using two cylindrical lens of convex-concave after expanding pinhole filter
Sheet beam is irradiated in coarse particles, and collecting it by the first CCD under 90 ° of angle of scatterings scatters light, and scattering light passes through beam splitting
It is collected afterwards by the 2nd CCD, to respectively obtain focusedimage and out-of-focus image.
The present invention is acquired with two CCD synchronous workings under the specific angle of scattering of particle respectively using laser interference image-forming principle to be dissipated
The focusedimage and out-of-focus image for penetrating light are passed through by carrying out the shape information that particle can be obtained in image enhancement to focusedimage
2D auto-correlation computations are done to out-of-focus image and particle is obtained according to the relationship between 2D self correlated peaks center width and particle size
Dimension information.The method, which can be realized, more accurately describes the information of the particles field.
Description of the drawings
Fig. 1 is the calculation flow chart of the present invention.
Fig. 2 is the laser interference imaging double reception light path system schematic diagram of the present invention：
In figure, 1 semiconductor laser, 2 microcobjectives, 3 pin holes, 4 collimation lenses, 5 pillar lens, 6 concave cylindrical lens, 7 carry
Slide, 8 imaging lens, 91:1 beam splitter, 10 first CCD, 11 second CCD.
Fig. 3 is the different shape coarse particles simulation drawing of the present invention, and Fig. 3 (a) is point of each shaped particle surface scattering light
Projection of the cloth in xoy planes；Fig. 3 (b) is the interference out-of-focus image of particle in Fig. 3 (a), and Fig. 3 (c) is the 2D of out-of-focus image from phase
Close image；The coloured image of Fig. 3 (d) 2D autocorrelogram pictures.
Fig. 4 is the interference imaging lab diagram to gravel.Fig. 4 (a) is the focusedimage of gravel, and Fig. 4 (b) is the defocus of gravel
Image, Fig. 4 (c) are the 2D autocorrelogram pictures of out-of-focus image, and Fig. 4 (d) is the enlarged drawing of 2D auto-correlation bright spot of view-field center.
Specific implementation mode
The present invention will be described with reference to the accompanying drawings and examples.
Experimental principle figure experimental provision according to Fig.2, wherein：Laser 1 is the semiconductor laser of wavelength 532nm
Device, maximum power 4w, expand pinhole filter by enlargement ratio be 10 × microcobjective 2 and size be 10 μm 3 groups of pin hole
At 4 focal length of collimation lens is 150mm, and 5 focal length of pillar lens is 200mm, and 6 focal length of concave cylindrical lens is -9.7mm, 7 ruler of glass slide
Very little is 25mm × 75mm × 1mm, and 8 focal length of imaging lens is 50mm, and aperture F=1.4,9 splitting ratio of beam splitter is 1:1, CCD sensing
Device 10 is identical with 11 parameter of ccd sensor, and valid pixel number is 1280*960, and Pixel size is 6.45 μm * 6.45 μm, and frame frequency is
15fps。
The sheet beam for becoming length 13mm, width about 1.0mm after two cylindrical lens compressions of convex-concave, is used in combination the light beam
Irradiation is sticked to the coarse gravel on glass slide, it is collected under 90 ° of angle of scatterings and scatters light；When measurement, system magnification M=
1.77, object distance z1=78mm, the image-forming range z of ccd sensor 102,focus=138mm, the image-forming range of ccd sensor 11
z2,focus+ Δ p=162mm, defocus distance, delta p=24mm.Total transmission coefficient B of imaging system at this timetot=z1+z2-z1z2/ f=
12.7。
The measurement method flow as shown in Fig. 1 of the present invention, steps are as follows：
I, build laser interference imaging double reception light path measuring system, while with two CCD obtain respectively focusedimage with
Out-of-focus image, CCD10 record the focusedimage of particle, and CCD11 records the speckle image of particle.
Ii, Fig. 3 are different shape coarse particles simulation drawings, and Fig. 3 (a) is being distributed in for each shaped particle surface scattering light
The projection of xoy planes；Fig. 3 (b) is the interference out-of-focus image of particle in Fig. 3 (a), and Fig. 3 (c) is the 2D autocorrelograms of out-of-focus image
Picture；Fig. 3 (d) is the coloured image of the 2D autocorrelogram pictures of out-of-focus image.Analog result indicates the size and its defocus figure of particle
The width of the 2D auto-correlation bright spot of view-field center of picture is related.
Iii, single gravel is selected to carry out interference imaging experiment, experimental result is as shown in Figure 4.Fig. 4 (a) is the focusing of gravel
Image, Fig. 4 (b) are the out-of-focus image of gravel, and Fig. 4 (c) is the 2D autocorrelogram pictures of out-of-focus image, and Fig. 4 (d) is in 2D auto-correlations
The enlarged drawing of heart speck.The shape information of gravel can be obtained by doing image enhancement to Fig. 4 (a), by calculating the centers Fig. 4 (d)
The width of speck can obtain the dimension information of gravel.
Claims (2)
1. a kind of aspherical coarse particles shape and size measurement method based on laser interference, includes the following steps：
I, laser interference imaging double-optical path system is built, receives KPT Scatter light simultaneously with two CCD, the first CCD is located at
The focusing image planes of imaging system, receive the focusing picture of particle, and the 2nd CCD is located at the defocus image planes of imaging system, receives particle
Interfere defocused image.
Ii, image enhancement is carried out to the focusing picture of the first CCD records, obtains the shape information of particle；To the 2nd CCD record from
It is burnt to obtain the 2D autocorrelogram pictures of defocused image as doing 2D auto-correlation computations, find the minimum dimension of 2D autocorrelogram inconocenter specks
Direction determines full-size and the direction of particle, and calculates the size with its perpendicular direction particle, according to defocused image 2D from phase
The relationship between image and particle size is closed, determines particle size, finally obtains the dimension information of particle.
Iii, comprehensive analysis shape information and dimension information, the interference imaging for providing irregular granules shape and size measure knot
Fruit.
2. according to the method described in claim 1, its feature exists, the light of laser transmitting after expanding pinhole filter using
It is irradiated in coarse particles as sheet beam after two cylindrical lens compressions of convex-concave, is collected by the first CCD under 90 ° of angle of scatterings
It scatters light, and scattering light is collected after beam splitting by the 2nd CCD, to respectively obtain focusedimage and out-of-focus image.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810372404.1A CN108593528B (en) | 2018-04-24 | 2018-04-24 | Laser interference based method for measuring shape and size of non-spherical rough particles |
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| CN201810372404.1A CN108593528B (en) | 2018-04-24 | 2018-04-24 | Laser interference based method for measuring shape and size of non-spherical rough particles |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109239930A (en) * | 2018-10-10 | 2019-01-18 | 哈尔滨工业大学 | A kind of saturation type laser sheet beam apparatus for shaping |
| CN116255922A (en) * | 2023-02-21 | 2023-06-13 | 昆明理工大学 | Spray particle diameter measurement method based on double laser interference |
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| CN103674791A (en) * | 2013-12-16 | 2014-03-26 | 天津大学 | Double beam irradiation-based interfering particle image measurement method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116255922A (en) * | 2023-02-21 | 2023-06-13 | 昆明理工大学 | Spray particle diameter measurement method based on double laser interference |
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