CN111289408A - Device and method for identifying particle distribution in Hell-Shore sheet by aid of laser - Google Patents
Device and method for identifying particle distribution in Hell-Shore sheet by aid of laser Download PDFInfo
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- CN111289408A CN111289408A CN202010117702.3A CN202010117702A CN111289408A CN 111289408 A CN111289408 A CN 111289408A CN 202010117702 A CN202010117702 A CN 202010117702A CN 111289408 A CN111289408 A CN 111289408A
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- 239000002245 particle Substances 0.000 title claims abstract description 132
- 238000000034 method Methods 0.000 title claims abstract description 33
- 239000011521 glass Substances 0.000 claims abstract description 41
- 238000012545 processing Methods 0.000 claims abstract description 22
- 230000003628 erosive effect Effects 0.000 claims abstract description 13
- 238000002360 preparation method Methods 0.000 claims 1
- 238000011161 development Methods 0.000 abstract description 7
- 238000012360 testing method Methods 0.000 description 17
- 238000011160 research Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
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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
- G01N15/02—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
- G01N15/0227—Investigating particle size or size distribution by optical means, e.g. by light scattering, diffraction, holography or imaging using imaging, e.g. a projected image of suspension; using holography
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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
Abstract
The invention discloses a method for identifying particle distribution in a Hull-Shore sheet plate by laser assistance, which adopts devices comprising a Hull-Shore particle glass slide frame, a laser lamp, a CCD camera, a data processing system, a sealed photostudio and a Hull-Shore particle glass slide; filling a particle sample into a Hell-Shore particle glass slide to form a particle bed, placing the particle bed on a Hell-Shore particle glass slide support in a sealed photostudio, providing a stable light source by using a laser lamp, and under the projection of the same light beam, acquiring each frame of images of the particle bed by a CCD camera within a fixed time interval; the method is characterized in that AlgolabPtvector picture processing software and Matlab software in a data processing system are combined to process and identify particle distribution in a particle bed, the thickness degree of particles is obtained through different brightness degrees presented on an identified picture, and a particle motion track and an erosion area are determined and used for observing the development process of backward source erosion in the Hull-Shore sheet.
Description
Technical Field
The invention relates to a water conservancy and geotechnical engineering test system, in particular to a test system for identifying particle distribution in a Hell-Shore sheet and determining a particle motion track and an erosion area by aid of laser.
Background
Particle starting is one of the basic problems of particle movement, and the mastering of the particle starting rule has very important significance on the research of the particle movement. The device and the method for identifying the particle distribution in the Hell-Shore sheet by the aid of the laser can determine the variation process of the particle thickness distribution, and have an important effect on observing and summarizing the particle starting rule. The distance between the particle-containing glass plates in the existing Hull-thin plate test is not variable, and the distribution and the change process of the particle thickness in the Hull-Shore thin plate cannot be directly observed by naked eyes. Due to light refraction, particles in the Hell-Shore sheet test cannot be identified under parallel natural light, and due to the fact that laser has very good directivity, monochromaticity and extremely high luminous intensity, the layer number distribution condition of the particles in the Hell-Shore sheet can be researched from the single particle layer, the motion trail of the particles is determined, the particle starting rule can be mastered, and the starting and development process of the source erosion after deep research is facilitated.
In order to obtain accurate test results, a test method for the distribution condition of a sample is urgently needed to be provided, and the sample is scientifically detected in the test process.
Disclosure of Invention
Aiming at the prior art, the invention provides a device and a method for identifying particle distribution in a Hell-Shore sheet in a laser-assisted manner, wherein the particles in the Hell-Shore sheet are irradiated by laser, the brightness difference of uniform dense powder particles under different thicknesses is considered, and the thickness of the particles in the Hell-Shore sheet is determined by processing test pictures so as to cooperate with observation and research of a seepage erosion development process in the Hell-Shore sheet.
In order to solve the technical problem, the invention provides a device for identifying particle distribution in a hall-shore sheet by laser assistance, which comprises a hall-shore particle glass slide frame arranged in a sealed photostudio, wherein a hall-shore particle glass slide is placed on the hall-shore particle glass slide frame, a light source is arranged above the hall-shore particle glass slide, a CCD camera is arranged below the hall-shore particle glass slide, and the CCD camera is connected to a data processing system; the light source adopts a laser lamp; the laser lamp is ZLM12D650-43BD and can emit a red light point-like laser parallel light source with the beam diameter of 30 mm; the height of the laser lamp is adjusted according to the radius of the Hell-Shore particle glass slide, so that the diameter of a light beam emitted by the laser lamp is larger than or equal to that of the Hell-Shore particle glass slide; the distance between two glass slides in the Hull-Shore particle containing glass slide is adjustable, and the adjusting range of the distance is 0.5-3.0 mm; the CCD camera adopts an industrial customized camera with the model number of acA640-90gm-Basler ace, and the lens of the CCD camera is towards the Hell-Shore particle glass slide; the data processing system comprises Matlab software and AlgolabPtvector picture processing software which are installed in a computer, and the data processing system receives, records and processes data from the CCD camera.
Further, the laser-assisted device for identifying the particle distribution in the Hell-Shore sheet is characterized in that the lens axis of the CCD camera is coincident with the central line of the Hell-Shore particle glass slide.
When the light source is in a closed state, the inside of the sealed photostudio is in an absolute lightless state.
Meanwhile, the invention also provides a method for identifying by using the device for identifying the particle distribution in the Hell-Shore sheet assisted by the laser, firstly, filling a particle sample into the Hell-Shore particle glass slide to form a particle bed; then, under the projection of the same light beam of the laser lamp, each frame of picture of the particle bed collected by the CCD camera is taken at a fixed time interval; and finally, combining AlgolabPtvector picture processing software and Matlab software in the data processing system to process and identify the particle distribution in the particle bed, and determining the particle motion track and the erosion area through all the pictures.
Further, the method for identifying the particle distribution in the hel-shore sheet with the aid of the laser according to the present invention comprises, for each frame of the picture processed by the data processing system: the thick part of the particles is black; the thin part of the particle is gray; and white in the absence of particles.
Compared with the prior art, the invention has the beneficial effects that:
the light source adopts a laser lamp with good directivity, monochromaticity and extremely high luminous intensity, combines AlgolabPtvector picture processing software and Matlab processing and identifies pictures collected in the test process, researches the layer number distribution condition of particles in the Hell-Shore sheet from the single particle layer, determines the change condition in the particle erosion process, and is beneficial to deeply researching the starting and development process of the backward source erosion in the Hell-Shore sheet.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus for laser-assisted identification of particle distribution in a Hell-Shore sheet according to the present invention;
FIG. 2 is a schematic diagram of an image acquisition process in the present invention;
fig. 3 is a schematic diagram of the recognition result obtained by the method for laser-assisted recognition of the particle distribution in a hel-shore sheet according to the present invention.
In the figure:
1. Hull-Shore particle glass rack 2, laser lamp 3 and CCD camera
4. Data processing system 5, sealed photostudio 6, hall-shore slide
7. Granular bed
Detailed Description
The invention will be further described with reference to the following figures and specific examples, which are not intended to limit the invention in any way.
The design idea of the invention is that the device and the method provided by the invention are used for calibrating the compactness and uniformity degree of the particle sample in the particle bed to prevent the test failure caused by the initial defect of the sample, thereby further perfecting the Hell-Shore thin plate test.
As shown in fig. 1, the apparatus for identifying particle distribution in hel-shore sheet assisted by laser according to the present invention comprises a hel-shore particle glass slide rack 1 disposed in a sealed photostudio 5, a hel-shore particle glass slide 6 disposed on the hel-shore particle glass slide rack 1, a light source disposed above the hel-shore particle glass slide 6, and a CCD camera 3 disposed below the hel-shore particle glass slide 6, wherein the CCD camera 3 is connected to a data processing system 4.
In the invention, the light source adopts a laser lamp 2, the diameter size of the light beam emitted by the laser lamp 2 is consistent with the size of the Hull-Shore sheet on the particle containing slide, and the laser lamp is fixed at a specified height position right above the center of the Hull-Shore particle containing slide 7 and used for providing stable and repeatable laser, namely the laser of the laser lamp 2 is kept stable and does not change in a single Hull-Shore sheet test process. The height of the laser lamp 2 is adjusted according to the radius of the Hell-Shore particle containing slide 6, so that the diameter of a light beam emitted by the laser lamp 2 is larger than or equal to that of the Hell-Shore particle containing slide 7, and a Hell-Shore sheet can enable laser to penetrate through the range of the particle containing slide, the type of the laser lamp 2 is ZLM12D650-43BD, and a red light point-shaped laser parallel light source with the light beam diameter of 30mm can be emitted.
The distance between the two glass slides in the Hull-Shore particle containing glass slide 6 is consistent with the size of the thin particle containing unit, the distance between the two glass slides in the Hull-Shore particle containing glass slide 6 is adjustable, and the adjusting range of the distance is between 0.5 mm and 3.0 mm.
The CCD camera 3 adopts an industrial customized camera with model number of acA640-90gm-Basler ace, the lens of the CCD camera 3 is towards the Hell-Shore particle containing slide 6, and the lens axis of the CCD camera 3 is coincident with the central line of the Hell-Shore particle containing slide 6. All pictures taken by the CCD camera 3 on which all images must be obtained by laser light through the grain sample.
The data processing system 4 comprises Matlab software and AlgolabPtVector picture processing software installed in a computer, and the data processing system 4 receives, records and processes data from the CCD camera 3.
The sealed photostudio 5 ensures that all devices and systems in the photostudio are free from external light interference, i.e. if no laser lamp 2 irradiates, the test device is in an absolute lightless state.
The invention provides a method for identifying particle distribution in a Hell-Shore sheet by laser assistance, which mainly aims to cooperate with observation and research on the development process of the backward source erosion in the Hell-Shore sheet. The method considers the brightness difference of uniform compact powder particles under different thickness degrees, determines the thickness degree of a sample by processing test pictures, and is mainly used for observing and researching the seepage erosion development process of a Hell-Shore thin plate.
As shown in fig. 1 and fig. 2, according to the method for identifying particle distribution in hel-shore sheet assisted by laser provided by the present invention, firstly, a particle sample is filled into the hel-shore particle glass slide 6 to form a particle bed 7, then, the hel-shore particle glass slide 6 is inserted into the clamping groove of the hel-shore particle glass slide holder 1, and when the test system is adjusted, the hel-shore particle glass slide holder 1 is required to be horizontally placed and not to be inclined; placing a Hell-Shore particle containing slide rack 1 embedded with a particle bed 7 in a sealed photostudio 5; a laser lamp 2 and a CCD camera 3 are respectively arranged above and below the Hell-Shore particle glass rack 1, so that the laser lamp 2, the Hell-Shore particle glass rack 1 and the CCD camera 3 are aligned, and the center positions are positioned on the same vertical line; adjusting the focal length of the CCD camera 3 to ensure that a Hell-Shore sheet particle image with proper size and clear image is obtained, and connecting the CCD camera with the data acquisition system 4; the fixed frequency was maintained during image acquisition and the laser source was kept stable during the test to study the initiation and development of back source erosion in the heler-shore sheet. Except the data acquisition system 4, other devices of the whole system are arranged in a sealed photostudio 5 to eliminate the interference of external light. The arrangement form of related devices in the device can be adjusted according to the specific test condition so as to achieve the best test effect.
When the concrete implementation is carried out, firstly, all the components in the whole device are prepared, and the relevant components are connected according to the figure 1; ensuring that the laser lamp 2 provides a stable light source at a specified height; when equipment is connected, a cover of the CCD camera 3 is ensured to be in a screwed state to prevent dust from entering, the CCD camera 3 at the bottom of the bracket is used for collecting pictures of the particle bed 7, under the projection of the same light beam of the laser lamp 2, each frame of picture of the particle bed 7 collected by the CCD camera 3 is processed and identified by combining AlgolabPtvector picture processing software and Matlab software in the data processing system 4 to obtain the thickness degree of the particles within a fixed time interval, namely the depth degree of the pictures is different, and the distribution situation of the particles in the particle bed 7 in each frame of picture processed by the data processing system 4 is respectively as follows: the thick part of the particles is black; the thin part of the particle is gray; the positions without the particles are white, and as shown in fig. 3, the motion tracks and the erosion areas of the particles are determined through all the pictures. In the present invention, the use of the algolabpttvector image processing software and the Matlab software is common knowledge in the art, and will not be described herein again.
While the present invention has been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are illustrative only and not restrictive, and various modifications which do not depart from the spirit of the present invention and which are intended to be covered by the claims of the present invention may be made by those skilled in the art.
Claims (5)
1. A device for identifying particle distribution in a Hell-Shore sheet by laser assistance comprises a Hell-Shore particle glass slide rack (1) arranged in a sealed photostudio (5), wherein a Hell-Shore particle glass slide (6) is placed on the Hell-Shore particle glass slide rack (1), a light source is arranged above the Hell-Shore particle glass slide (6), a CCD camera (3) is arranged below the Hell-Shore particle glass slide (6), and the CCD camera (3) is connected to a data processing system (4); it is characterized in that the preparation method is characterized in that,
the light source adopts a laser lamp (2);
the laser lamp (2) is ZLM12D650-43BD and can emit a red light point-like laser parallel light source with the beam diameter of 30 mm; the height of the laser lamp (2) is adjusted according to the radius of the Hell-Shore particle containing slide (6) so as to ensure that the diameter of a light beam emitted by the laser lamp (2) is more than or equal to that of the Hell-Shore particle containing slide (7);
the distance between two glass slides in the Hull-Shore particle containing glass slide (6) is adjustable, and the adjusting range of the distance is 0.5-3.0 mm;
the CCD camera (3) adopts an industrial customized camera with model number of acA640-90gm-Basler ace, and the lens of the CCD camera (3) is towards the Hell-Shore particle glass slide (6);
the data processing system (4) comprises Matlab software and AlgolabPtvector picture processing software which are installed in a computer, and the data processing system (4) receives, records and processes data from the CCD camera (3).
2. The device for laser-assisted identification of particle distribution in a hel-shore sheet according to claim 1, characterized in that the lens axis of the CCD camera (3) coincides with the centre line of the hel-shore particle slide (6).
3. Device for laser-assisted identification of the particle distribution in a hel-shore sheet according to claim 1, characterised in that the inside of the sealed photostudio (5) is in absolute absence of light when the light source is in the off state.
4. A method for laser-assisted identification of particle distribution in hel-shore sheets, characterized in that a particle bed (7) is formed by filling a particle sample into the hel-shore slide (6) by means of the device for laser-assisted identification of particle distribution in hel-shore sheets according to claim 1, the particle bed (7) is identified by means of each frame of image of the particle bed (7) acquired by the CCD camera (3) at fixed time intervals under the projection of the same beam of the laser lamp (2), the particle distribution in the particle bed (7) is identified by means of the algolabptcector image processing software and the Matlab software in the data processing system (4), and the particle motion trajectory and the erosion area are determined from all the images.
5. Method for laser-assisted identification of the particle distribution in hel-shore sheets according to claim 4, characterized in that, in each frame of the sheet after processing by the data processing system (4): the thick part of the particles is black; the thin part of the particle is gray; and white in the absence of particles.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010117702.3A CN111289408A (en) | 2020-02-25 | 2020-02-25 | Device and method for identifying particle distribution in Hell-Shore sheet by aid of laser |
| PCT/CN2020/135208 WO2021121120A1 (en) | 2019-12-17 | 2020-12-10 | Hele-shaw principle-based fluid-solid interaction test system, related devices, and test method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010117702.3A CN111289408A (en) | 2020-02-25 | 2020-02-25 | Device and method for identifying particle distribution in Hell-Shore sheet by aid of laser |
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| CN111289408A true CN111289408A (en) | 2020-06-16 |
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| CN202010117702.3A Pending CN111289408A (en) | 2019-12-17 | 2020-02-25 | Device and method for identifying particle distribution in Hell-Shore sheet by aid of laser |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112557626A (en) * | 2020-11-27 | 2021-03-26 | 天津大学 | Hull-Shore principle-based flow-solid interaction test system and test method |
| WO2021121120A1 (en) * | 2019-12-17 | 2021-06-24 | 天津大学 | Hele-shaw principle-based fluid-solid interaction test system, related devices, and test method |
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