Magnetic liquid drop and particle collision measurement experiment device based on computer vision technology

Abstract

The invention provides a magnetic liquid drop and particle collision measurement experiment device based on a computer vision technology, and belongs to the field of particle collision characteristic detection. The problems that in the collision measurement process of the magnetic liquid drops and the particles, external field regulation and control are lacked, and personal errors exist in the image analysis process are solved. The device comprises a magnetic control device, a particle fixing device, a liquid drop emitting device and a data acquisition and processing device, the magnetic control device controls the magnetic field intensity by controlling the magnitude of voltage and current input by a direct-current power supply, and the magnetic field direction is changed by adjusting a magnetic field generator; the particle fixing device fixes particles; the liquid drop emitting device emits magnetic liquid drops; a high-speed camera and a data acquisition instrument in the data acquisition and processing device can acquire and record experimental data and feed back the experimental data to a data processing unit, and a computer vision technology is utilized to carry out dynamic capture and image recognition on the spreading process of the magnetic liquid drops on the surfaces of the particles. The collision process can be accurately controlled, and the collision process is dynamically captured through the computer vision technology.

Description

Technical Field

[0001] The invention belongs to the technical field of particle collision characteristic detection, and in particular relates to a magnetic droplet and particle collision measurement experimental device based on computer vision technology. Background Art

[0002] The droplet-particle interaction process is widely used in engineering, such as fluid catalytic cracking, polyethylene synthesis, spray drying, catalysis, drug delivery and other processes. This interaction involves the collision, merging and dispersion mechanism between droplets and particles, which affects the material transfer efficiency and reaction rate. In the spray drying process, the interaction between droplets and particles determines the drying rate and the properties of the final particles; in the catalytic process, droplets can effectively transfer reactants to the catalyst surface and improve the reaction efficiency; and in the drug delivery process, the stability of droplets and the adsorption characteristics of particles affect the release and bioavailability of drugs. By in-depth study of these interactions, various industrial processes can be optimized to improve product quality and production efficiency.

[0003] The droplet-particle collision measurement experimental device in the prior art is usually used to measure the spreading process of the droplet on the particle surface without the action of an external field, and often ignores the interaction between the droplet and the particle under the action of the external field, and the existing experimental device usually lacks precise control over the droplet spreading process on the particle; in addition, the observation methods of the existing experimental device mostly rely on naked eye observation or low-speed video recording, which cannot capture subtle changes in the high-speed collision process, which limits the timeliness and accuracy of data acquisition, and image analysis often requires manual processing, increasing the risk of human error. The shortcomings of traditional technology in image processing and automatic analysis have hindered the in-depth understanding of the droplet-particle collision process, especially the dynamic characteristics of droplet morphology changes and collision moments. Summary of the invention

[0004] In view of this, in order to solve the problems of lack of external field regulation and precise control in the measurement process of magnetic droplet and particle collision, inability to capture subtle changes in high-speed collision, and human errors in the image analysis process, the present invention proposes a magnetic droplet and particle collision measurement experimental device based on computer vision technology.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] An experimental device for measuring collision between magnetic droplets and particles based on computer vision technology, comprising:

[0007] The magnetostrictive device includes a DC power supply and a magnetic field generator. The DC power supply can supply power to the magnetic field generator, and the magnetic field generator can generate a magnetic field. The intensity of the magnetic field can be controlled by controlling the voltage and current of the DC power supply input, and the direction of the magnetic field can be changed by adjusting the magnetic field generator.

[0008] a particle fixing device, used for fixing particles, wherein the particles are located in the magnetic field;

[0009] A droplet emission device, used for emitting magnetic droplets so that the magnetic droplets collide with the particles;

[0010] The data acquisition and processing device includes a high-speed camera, a data acquisition instrument and a data processing unit. The high-speed camera and the data acquisition instrument can collect and record experimental data and feed it back to the data processing unit, and use computer vision technology to dynamically capture and image recognize the spreading process of magnetic droplets on the particle surface.

[0011] As a preferred solution of the above-mentioned magnetic droplet and particle collision measurement experimental device based on computer vision technology, the particle fixing device includes a fixing seat and a vacuum suction pen, the particle is fixed at the upper end of the vacuum suction pen, and the vacuum suction pen is fixed above the fixing seat.

[0012] As a preferred solution of the above-mentioned magnetic droplet and particle collision measurement experimental device based on computer vision technology, the fixed seat includes a horizontal plate and a shock-absorbing plate, the shock-absorbing plate is fixedly arranged above the horizontal plate, and the vacuum suction pen is fixedly arranged above the shock-absorbing plate.

[0013] As a preferred solution of the above-mentioned magnetic droplet and particle collision measurement experimental device based on computer vision technology, the droplet launching device includes a bracket and an injection needle, the injection needle is fixedly arranged on the bracket, the injection needle is located above the particle, and the injection needle can launch the magnetic droplet.

[0014] As a preferred solution of the above-mentioned magnetic droplet and particle collision measurement experimental device based on computer vision technology, the bracket includes an iron frame and a movable slider, the movable slider is slidably set on the iron frame along the vertical direction, and the injection needle is fixedly set on the movable slider.

[0015] As a preferred solution of the above-mentioned magnetic droplet and particle collision measurement experimental device based on computer vision technology, the droplet launch device also includes a displacement controller and a motor, the motor is transmission-connected to the piston of the injection needle, the displacement controller is electrically connected to the motor, and the position controller can control the motor to drive the piston movement of the injection needle, thereby controlling the volume of the magnetic droplet.

[0016] As a preferred solution of the above-mentioned magnetic droplet and particle collision measurement experimental device based on computer vision technology, the droplet emission device also includes a vertical height meter, which can measure the verticality and height of the injection needle tube.

[0017] As a preferred solution of the above-mentioned magnetic droplet and particle collision measurement experimental device based on computer vision technology, the magnetic droplet and particle collision measurement experimental device based on computer vision technology also includes an LED light source, and the LED light source can illuminate the particles.

[0018] As a preferred solution of the above-mentioned magnetic droplet and particle collision measurement experimental device based on computer vision technology, the magnetic droplet is a Fe3O4 nanoparticle suspension, the concentration of the magnetic droplet is 2%-20%, and the diameter of the Fe3O4 nanoparticles in the Fe3O4 nanoparticle suspension is less than 60nm.

[0019] As a preferred solution of the above-mentioned magnetic droplet and particle collision measurement experimental device based on computer vision technology, the power of the DC power supply is 500W-2000W, and the magnetic field generator can generate a constant magnetic field and a gradient magnetic field of 0-5T.

[0020] Compared with the prior art, the beneficial effects of the magnetic droplet and particle collision measurement experimental device provided by the present invention based on computer vision technology are:

[0021] The invention provides a magnetic droplet and particle collision measurement experimental device based on computer vision technology. The magnetic droplet and particle collision measurement experimental device based on computer vision technology has particles fixed above the particle fixing device, and a droplet launcher can launch magnetic droplets from above the particles, so that the magnetic droplets collide with the particles. A magnetic field generator can generate a magnetic field, and the magnetic droplets collide with the particles in the magnetic field. The intensity of the magnetic field can be controlled by controlling the voltage and current of a DC power supply input, and the direction of the magnetic field can be changed by adjusting the magnetic field generator, so that the size and direction of the external magnetic field can be flexibly adjusted, and the interaction between the magnetic droplets and the particles under different conditions is systematically studied, so as to realize the precise control of the collision process of the magnetic droplets on the particle surface. In addition, the experimental device integrates high-speed video and advanced image processing technology, and can capture and analyze the collision process of the magnetic droplets and the particles in real time. The high-speed camera with a high frame rate can capture the instantaneous dynamics of the collision, provide rich time series data, and then deeply analyze the key parameters such as the morphological changes and speed of the magnetic droplets, and with the help of computer vision technology, the experimental data can be automatically processed, which can significantly improve the efficiency and accuracy of data analysis and reduce human errors.

[0022] The magnetic droplet-particle collision measurement experimental device based on computer vision technology introduces a magnetic field to precisely control the collision process of magnetic droplets on the particle surface, and uses computer vision technology to dynamically capture the collision process between droplets and particles. It can achieve accurate measurement of the magnetic droplet-particle collision measurement process, ensure the repeatability and reliability of experimental data, improve the understanding of the interaction between magnetic droplets and particles, and more comprehensively reveal the complex dynamic behavior of magnetic droplets and particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0024] Figure 1 It is a structural schematic diagram of a magnetic droplet and particle collision measurement experimental device based on computer vision technology provided in a specific embodiment of the present invention.

[0025] In the figure:

[0026] 11. DC power supply; 12. Magnetic field generator;

[0027] 21. Horizontal plate; 22. Shock-absorbing plate; 23. Vacuum pen;

[0028] 3. Particles;

[0029] 41. Injection needle; 42. Iron frame; 43. Moving slide block; 44. Vertical height meter; 45. Displacement controller;

[0030] 5. Magnetic droplets;

[0031] 61. High-speed camera; 62. Data acquisition device; 63. Data processing unit;

[0032] 7. LED light source. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely explain the technical solutions in the embodiments of the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict, and the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0034] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0036] In the description of this embodiment, the terms "upper", "lower", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0037] See also Figure 1 The present embodiment is described. The present invention provides a magnetic droplet and particle collision measurement experimental device based on computer vision technology. The magnetic droplet and particle collision measurement experimental device based on computer vision technology includes a magnetostriction device, a particle fixing device, a droplet launching device and a data acquisition and processing device. The magnetostriction device includes a DC power supply 11 and a magnetic field generator 12. The DC power supply 11 can supply power to the magnetic field generator 12. The magnetic field generator 12 can generate a magnetic field. The intensity of the magnetic field can be controlled by controlling the voltage and current input by the DC power supply 11, and the direction of the magnetic field can be changed by adjusting the magnetic field generator 12. The particle fixing device is used to fix the particle 3, and the particle 3 is located in the magnetic field. The droplet launching device is used to launch magnetic droplets 5 so that the magnetic droplets 5 collide with the particle 3. The data acquisition and processing device includes a high-speed camera 61, a data acquisition instrument 62 and a data processing unit 63. The high-speed camera 61 and the data acquisition instrument 62 can collect and record experimental data and feed it back to the data processing unit 63, and the computer vision technology is used to dynamically capture and image recognize the spreading process of the magnetic droplet 5 on the surface of the particle 3.

[0038] In the magnetic droplet and particle collision measurement experimental device based on computer vision technology, the particle 3 is fixed above the particle fixing device, and the droplet launcher can launch the magnetic droplet 5 from above the particle 3, so that the magnetic droplet 5 collides with the particle 3. The magnetic field generator 12 can generate a magnetic field, and the magnetic droplet 5 collides with the particle 3 in the magnetic field. The intensity of the magnetic field can be controlled by controlling the voltage and current input by the DC power supply 11, and the direction of the magnetic field can be changed by adjusting the magnetic field generator 12, so that the size and direction of the external magnetic field can be flexibly adjusted, and the interaction between the magnetic droplet 5 and the particle 3 under different conditions is systematically studied, so as to achieve precise control of the collision process of the magnetic droplet 5 on the surface of the particle 3. In addition, the experimental device integrates high-speed video and advanced image processing technology, and can capture and analyze the collision process of the magnetic droplet 5 and the particle 3 in real time. The high-speed camera with a high frame rate can capture the instantaneous dynamics of the collision, provide rich time series data, and then deeply analyze the key parameters such as the morphological changes and speed of the magnetic droplet 5. With the help of computer vision technology, the experimental data can be automatically processed, which can significantly improve the efficiency and accuracy of data analysis and reduce human errors.

[0039] The magnetic droplet and particle collision measurement experimental device based on computer vision technology introduces a magnetic field to accurately control the collision process of the magnetic droplet 5 on the surface of the particle 3, and dynamically captures the collision process of the magnetic droplet 5 and the particle 3 through computer vision technology. It can achieve accurate measurement of the collision measurement process of the magnetic droplet 5 and the particle 3, ensure the repeatability and reliability of the experimental data, improve the understanding of the interaction between the magnetic droplet 5 and the particle 3, and can more comprehensively reveal the complex dynamic behavior of the magnetic droplet 5 and the particle 3.

[0040] In this embodiment, the highest resolution of the high-speed camera 61 can reach 4K (3840×2160), and the frame rate can reach 8000 FPS.

[0041] Optionally, the particle fixing device includes a fixing seat and a vacuum pen 23, the particle 3 is fixed at the upper end of the vacuum pen 23, and the vacuum pen 23 is fixed above the fixing seat. In this embodiment, the inclination angle of the fixing seat relative to the horizontal plane should be controlled within ±0.1°, and the angle between the line connecting the center of the magnetic droplet 5 and the center of the particle 3 and the fixing seat is controlled between 89° and 91°.

[0042] Optionally, the fixing base includes a horizontal plate 21 and a shock absorbing plate 22, the shock absorbing plate 22 is fixedly arranged above the horizontal plate 21, and the vacuum suction pen 23 is fixedly arranged above the shock absorbing plate 22. The horizontal plate 21 and the shock absorbing plate 22 can ensure that the particles 3 are in a horizontal state.

[0043] Optionally, the droplet launcher includes a bracket and an injection needle 41, the injection needle 41 is fixedly arranged on the bracket, the injection needle 41 is located above the particle 3, and the injection needle 41 can launch magnetic droplets 5. The outlet of the injection needle 41 faces downward, and when the piston of the injection needle 41 is pushed downward, the liquid in the injection needle 41 is squeezed toward the outlet, and the liquid forms magnetic droplets 5 at the outlet and drips, colliding with the particle 3 below.

[0044] Optionally, the support includes an iron frame 42 and a movable slider 43, the movable slider 43 is slidably disposed on the iron frame 42 along a vertical direction, and the injection needle 41 is fixedly disposed on the movable slider 43. The emission height of the magnetic droplet 5 can be controlled by adjusting the movable slider 43.

[0045] Optionally, the droplet launch device further includes a displacement controller 45 and a motor, the motor is connected to the piston of the injection needle 41 by transmission, the displacement controller 45 is electrically connected to the motor, and the position controller can control the motor to drive the piston movement of the injection needle 41, thereby controlling the volume of the magnetic droplet 5. The displacement controller 45 can control the piston movement of the injection needle 41 by controlling the motor, thereby controlling the volume of the magnetic droplet 5 formed at the outlet of the injection needle 41. When the volume of the magnetic droplet 5 reaches the requirement, the piston stops moving, and the magnetic droplet 5 will fall freely. Thus, the size of the emitted magnetic droplet 5 can be controlled.

[0046] Optionally, the droplet launcher further includes a vertical height meter 44, which can measure the verticality and height of the injection needle tube 41. The vertical height meter 44 is arranged on the bracket, and the vertical height meter 44 can measure the verticality of the bracket, thereby measuring the verticality of the injection needle tube 41. It can also measure the height of the injection needle tube 41.

[0047] Optionally, the magnetic droplet and particle collision measurement experimental device based on computer vision technology further includes an LED light source 7, which can illuminate the particles 3. The LED light source 7 is used for illumination to increase the brightness of the magnetic droplet 5 and the particles 3.

[0048] In this embodiment, the magnetic droplets 5 are a suspension of Fe3O4 nanoparticles 3, the concentration of the magnetic droplets 5 is 2%-20%, and the diameter of the Fe3O4 nanoparticles in the Fe3O4 nanoparticle suspension is less than 60 nm.

[0049] In this embodiment, the power of the DC power supply 11 is 500W-2000W, and the magnetic field generator 12 can generate a constant magnetic field and a gradient magnetic field of 0-5T.

[0050] In this embodiment, the magnetic droplet and particle collision measurement experimental device based on computer vision technology measures the collision process between the magnetic droplet 5 and the particle 3 within the range of 20mm-50mm of the incident height of the magnetic droplet 5 when the diameter of the particle 3 is 4mm, the concentration of the magnetic nanoparticle 3 suspension is 5%, and the diameter of the magnetic droplet 5 is 2mm. Specifically, the vacuum pen 23 is fixed on the shock-absorbing plate 22 and placed on the horizontal plate 21, and then the particle 3 is fixed on the vacuum pen 23, the iron frame 42 and the movable slider 43 are used to fix the injection needle 41, and the movable slider 43 is adjusted in combination with the vertical height meter 44 to control the incident height of the magnetic droplet 5 to be 20mm-50mm, and the displacement controller 45 is used to control the size of the incident magnetic droplet 5 to be 2mm; the direction of the magnetic field is controlled to be vertically downward, and the magnetic field strength is controlled by controlling the voltage and current of the DC power supply 11 input; a 2000FPS high-speed camera 61 and a data acquisition instrument 62 are used to collect and record the experimental process of the magnetic droplet 5 spreading on the surface of the particle 3, and the experimental results are fed back to the data processing unit 63, and computer vision technology is used to dynamically capture and image recognize the spreading process of the magnetic droplet 5 on the surface of the particle 3, and further analyze the influence of different magnetic field strengths on the spreading process of the droplet on the surface of the particle 3.

[0051] Obviously, the embodiments of the present invention disclosed above are only used to help illustrate the present invention. The embodiments do not describe all the details in detail, nor do they limit the invention to specific implementation methods. According to the content of this specification, many modifications and changes can be made. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. It is not necessary and impossible to exhaustively list all implementation methods here.

Claims

1. A magnetic droplet and particle collision measurement experimental device based on computer vision technology, characterized in that: include: The magnetron device comprises a DC power supply (11) and a magnetic field generator (12), wherein the DC power supply (11) can supply power to the magnetic field generator (12), and the magnetic field generator (12) can generate a magnetic field. The intensity of the magnetic field can be controlled by controlling the voltage and current input by the DC power supply (11), and the direction of the magnetic field can be changed by adjusting the magnetic field generator (12); A particle fixing device, used for fixing particles (3), wherein the particles (3) are located in the magnetic field; A droplet emission device, used for emitting magnetic droplets (5) so that the magnetic droplets (5) collide with the particles (3); The data acquisition and processing device comprises a high-speed camera (61), a data acquisition instrument (62) and a data processing unit (63). The high-speed camera (61) and the data acquisition instrument (62) can acquire and record experimental data and feed it back to the data processing unit (63), and use computer vision technology to dynamically capture and image recognize the spreading process of magnetic droplets (5) on the surface of particles (3).

2. The magnetic droplet and particle collision measurement experimental device based on computer vision technology according to claim 1 is characterized by: The particle fixing device comprises a fixing seat and a vacuum suction pen (23), the particle (3) is fixed on the upper end of the vacuum suction pen (23), and the vacuum suction pen (23) is fixed above the fixing seat.

3. The magnetic droplet and particle collision measurement experimental device based on computer vision technology according to claim 2 is characterized by: The fixing seat comprises a horizontal plate (21) and a shock absorbing plate (22); the shock absorbing plate (22) is fixedly arranged above the horizontal plate (21); and the vacuum suction pen (23) is fixedly arranged above the shock absorbing plate (22).

4. The magnetic droplet and particle collision measurement experimental device based on computer vision technology according to claim 1 is characterized by: The droplet emission device comprises a support and an injection needle (41), wherein the injection needle (41) is fixedly arranged on the support, the injection needle (41) is located above the particle (3), and the injection needle (41) can emit the magnetic droplet (5).

5. The magnetic droplet and particle collision measurement experimental device based on computer vision technology according to claim 4 is characterized by: The support comprises an iron frame (42) and a movable slider (43); the movable slider (43) is slidably arranged on the iron frame (42) along a vertical direction, and the injection needle tube (41) is fixedly arranged on the movable slider (43).

6. The magnetic droplet and particle collision measurement experimental device based on computer vision technology according to claim 4 is characterized by: The droplet emission device further comprises a displacement controller (45) and a motor, the motor being drivingly connected to the piston of the injection needle tube (41), the displacement controller (45) being electrically connected to the motor, and the position controller being able to control the motor to drive the piston of the injection needle tube (41) to move, thereby controlling the volume of the magnetic droplet (5).

7. The magnetic droplet and particle collision measurement experimental device based on computer vision technology according to claim 4 is characterized by: The droplet emission device also includes a vertical height meter (44), which can measure the verticality and height of the injection needle tube (41).

8. The magnetic droplet and particle collision measurement experimental device based on computer vision technology according to claim 1 is characterized by: It also comprises an LED light source (7), wherein the LED light source (7) can illuminate the particles (3).

9. The magnetic droplet and particle collision measurement experimental device based on computer vision technology according to claim 1 is characterized by: The magnetic droplets (5) are Fe3O4 nanoparticle suspensions, the concentration of the magnetic droplets (5) is 2%-20%, and the diameter of the Fe3O4 nanoparticles in the Fe3O4 nanoparticle suspension is less than 60nm.

10. The magnetic droplet and particle collision measurement experimental device based on computer vision technology according to claim 1, characterized in that: The power of the DC power supply (11) is 500W-2000W, and the magnetic field generator (12) can generate a constant magnetic field and a gradient magnetic field of 0-5T.

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