CN116858729A - Portable miniature contact angle tester - Google Patents
Portable miniature contact angle tester Download PDFInfo
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- CN116858729A CN116858729A CN202311067211.2A CN202311067211A CN116858729A CN 116858729 A CN116858729 A CN 116858729A CN 202311067211 A CN202311067211 A CN 202311067211A CN 116858729 A CN116858729 A CN 116858729A
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- 239000007788 liquid Substances 0.000 claims abstract description 134
- 238000012360 testing method Methods 0.000 claims abstract description 31
- 238000002347 injection Methods 0.000 claims abstract description 21
- 239000007924 injection Substances 0.000 claims abstract description 21
- 238000003384 imaging method Methods 0.000 claims abstract description 18
- 238000003860 storage Methods 0.000 claims abstract description 14
- 238000004458 analytical method Methods 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000004364 calculation method Methods 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 238000004448 titration Methods 0.000 claims description 6
- 238000010586 diagram Methods 0.000 claims description 5
- 238000010191 image analysis Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 238000005094 computer simulation Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- 238000001514 detection method Methods 0.000 abstract description 10
- 238000011160 research Methods 0.000 abstract description 5
- 230000006872 improvement Effects 0.000 description 7
- 238000005259 measurement Methods 0.000 description 3
- 230000005501 phase interface Effects 0.000 description 3
- 238000004422 calculation algorithm Methods 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003032 molecular docking Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention belongs to the technical field of testers, and particularly relates to a portable miniature contact angle tester which comprises a controller, a liquid storage pressure bottle and a liquid drop imaging host, wherein the controller is connected with the liquid storage pressure bottle through a pneumatic pipeline, the liquid drop imaging host comprises a liquid injection tube, a CCD camera structure and an LED light source structure, one end of the liquid injection tube sequentially penetrates through a camera fixing structure and a light source fixing structure, the LED light source and the CCD camera are vertically imaged on the same surface, and the controller is connected with the liquid injection tube through a liquid conveying tube. The invention is not only convenient to carry, but also can realize the test of the product with the concave-convex surface while meeting the detection of the surface wettability of the product on the conventional horizontal plane; the mechanical detection performance is stable, so that the quality of products can be ensured, and the accuracy of experimental research data can be ensured; meanwhile, the analysis speed is high, and the production efficiency can be improved; and the whole tester is small in size and can be well abutted to production equipment for automatic testing.
Description
Technical Field
The invention belongs to the technical field of testers, and particularly relates to a portable miniature contact angle tester.
Background
The contact angle measuring instrument is defined as an included angle between a gas-liquid phase interface and a solid-liquid phase interface at a solid-liquid-gas phase interface, the contact angle is a scale for displaying the humidity of the solid surface, most sessile liquid drops are utilized for measurement, and a low contact angle indicates high humidity (hydrophilicity) and easy adhesion of the surface; a high contact angle means that the surface exhibits hydrophobicity, the surface has a heavy organic contamination or the surface has poor adhesion. The contact angle of a liquid in contact with a flat solid surface is determined by the endpoint of the water droplet curve in the liquid-solid-gas junction and the contact point of the solid surface to analyze the surface cleanliness.
However, the contact angle measuring instrument in the prior art can only measure the contact angle of a planar product, cannot observe and analyze the contact angle of a concave-convex surface product, is inconvenient to carry, and cannot analyze and test the wettability of the surface on line.
In view of the above, the present invention aims to provide a portable micro contact angle tester, which is not only convenient to carry, but also can realize the test of a product with a concave-convex surface while satisfying the detection of the surface wettability of a conventional horizontal product; the mechanical detection performance is stable, so that the quality of products can be ensured, and the accuracy of experimental research data can be ensured; meanwhile, the analysis speed is high, and the production efficiency can be improved; the whole tester is small in size and can be well abutted to production equipment for automatic testing; in addition, the liquid in the invention can be conveyed through the liquid storage bottle pipeline, and the liquid can be automatically dripped by using air pressure.
Disclosure of Invention
The invention aims at: aiming at the defects of the prior art, the portable miniature contact angle tester is convenient to carry, and can realize the test of a product with an uneven surface while meeting the detection of the surface wettability of a conventional horizontal product; the mechanical detection performance is stable, so that the quality of products can be ensured, and the accuracy of experimental research data can be ensured; meanwhile, the analysis speed is high, and the production efficiency can be improved; the whole tester is small in size and can be well abutted to production equipment for automatic testing; in addition, the liquid in the invention can be conveyed through the liquid storage bottle pipeline, and the liquid can be automatically dripped by using air pressure.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the utility model provides a portable miniature contact angle tester, includes controller, deposit hydraulic pressure bottle and dropping liquid imaging host computer, the controller pass through pneumatic pipeline with deposit hydraulic pressure bottle and be connected, dropping liquid imaging host computer includes liquid injection tube, CCD camera structure and LED light source structure, CCD camera structure includes CCD camera and camera fixed knot construct, LED light source structure includes LED light source and light source fixed knot construct, camera fixed knot constructs and is located light source fixed knot constructs the top, the one end of liquid injection tube passes in proper order camera fixed knot constructs with light source fixed knot constructs, the CCD camera passes light source fixed knot constructs, the LED light source with CCD camera homonymy vertical imaging, the controller pass through the liquid conveyer pipe with liquid injection tube connects.
As an improvement of the portable miniature contact angle tester, the controller comprises a control board, a converter and a pressure pump, wherein the pneumatic pipeline is connected with the control board through the converter, the pressure pump is also connected with the reservoir pressure bottle through the pneumatic pipeline, and the tester controls dropping liquid through the pneumatic pipeline and measures the contact angle through a contour contrast method.
As an improvement of the portable miniature contact angle tester, the contour contrast method comprises the following specific operations: before dropping, the controller firstly collects a frame of image, after the liquid is dropped onto a product in a non-contact hanging manner by the liquid storage pressure bottle, then collects a frame of image, records a state diagram of the liquid on the surface of the product, compares two images before and after dropping to obtain the contour size and the position of the liquid, and then carries out analysis fitting on the images to calculate the contact angle degree.
As an improvement of the portable miniature contact angle tester, the analysis fitting of the image is based on a calculation model which minimizes the liquid energy under the combined action of the liquid tension and the solid surface energy, namely
Wherein:
gamma: representing the gravity per unit volume;
z=z (r) represents the liquid surface equation;
sigma: surface energy per unit area;
ds：representing a unit length;
drip out liquidIs a known value, and depends on the air pressure of the controller on water, the radius of the titration head and the titration time, wherein the relation between the air pressure and the liquid flow rate is expressed by Bernoulli equation that p+ρgz+0.5 ρv 2 Calculation of =c;
determining the final shape of a liquid also requires measuring the contour of the liquid on the surface of the material, i.e. the surface equation z=z (r), r 2 ＝x 2 +y 2 I.e. obtained by image analysis.
As an improvement of the portable miniature contact angle tester, the specific process of controlling the dropping liquid by the pneumatic pipeline is as follows: the controller controls the pressure of the gas output from the pneumatic pipeline according to the set pressure, and the liquid storage pressure bottle conveys liquid to the liquid injection tube for liquid dripping under the pressure of the gas. The controller is used for controlling the air pressure to accurately control the liquid flow, so that the liquid outlet is ensured to be uniform and stable, the requirement of the testing precision of the customer product is met, the operation is simple, and the use purpose can be achieved by setting parameters. The liquid can be pure water or pure liquid (better flowability) to be tested.
As an improvement of the portable miniature contact angle tester, the gas in the pneumatic pipeline is air.
As an improvement of the portable miniature contact angle tester, a one-key test switch is arranged on a drip imaging host. When the image is acquired, the clear image is extracted through a top view automatic focusing mode.
As an improvement of the portable miniature contact angle tester, after the liquid injection tube drops liquid on a product, the dropped liquid is positioned below the CCD camera.
The working principle of the invention is as follows: the liquid drops are automatically injected by controlling air pressure, the optical principle that the LED light source on the top surface and the CCD lens are imaged vertically on the same surface is adopted for testing, the testing data are compared for analysis and calculation, the CCD camera shoots downwards from the top, the form of the liquid on the plane, the concave surface or the convex surface can be shot, the 3D model state of the liquid on the surface of a product is tested, and the correct measurement result data are obtained through algorithm fitting analysis. The main invention points of the invention are as follows:
1. the test liquid is delivered through a pneumatic line controlled by pneumatic pressure.
2. The air pressure control realizes automatic injection of liquid drops and liquid drop precision.
3. The imaging extracts clear images through a top-view automatic focusing mode.
4. And (5) automatically judging the performance of the data product and analyzing the report through an image analysis test.
5. And placing the equipment host on the product, and clicking a test button to complete the test.
Compared with the prior art, the invention adopts the CCD camera to observe the state (top view contact angle) of the liquid drop on the surface of the product from top to bottom in real time, and analyzes and calculates the contour model of the liquid drop which is dropped on the surface of the sample, and has at least the following advantages:
firstly, the portable product can not only meet the performance detection of surface wetting of a conventional horizontal product, but also test the product with the concave-convex surface;
secondly, the mechanical detection performance is stable, the quality of products is ensured, and the accuracy of experimental research data is ensured;
thirdly, the analysis speed is high, so that the production efficiency can be improved;
fourth, small size can be well docked production equipment to automatically test, and the automatic docking production equipment can realize online water drop angle test.
Drawings
Fig. 1 is a schematic perspective view of the present invention.
Fig. 2 is a schematic side view of the present invention.
Fig. 3 is a schematic perspective view of a host for drip imaging in the present invention.
FIG. 4 is a schematic diagram of a partially exploded structure of a drip imaging host in accordance with the present invention.
Fig. 5 is a schematic top view of the inside of the drip imaging mainframe according to the present invention.
Fig. 6 is a schematic diagram of the structure of the reservoir pressure bottle and the controller in the present invention.
Fig. 7 is a surface equation image.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, in the embodiments of the present invention, all directional indicators (such as up, down, left, right, front, and rear … …) are merely used to explain the relative positional relationship, movement conditions, and the like between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicators are correspondingly changed.
As shown in fig. 1 to 6, the invention provides a portable micro contact angle tester, which comprises a controller 1, a liquid storage pressure bottle 2 and a liquid drop imaging host 3, wherein the controller 1 is connected with the liquid storage pressure bottle 2 through a pneumatic pipeline 4, the liquid drop imaging host 3 comprises a liquid injection tube 31, a CCD camera structure 32 and an LED light source structure 33, the CCD camera structure 32 comprises a CCD camera 321 and a camera fixing structure 322, the LED light source structure 33 comprises an LED light source 331 and a light source fixing structure 332, the camera fixing structure 322 is positioned above the light source fixing structure 332, one end of the liquid injection tube 31 sequentially passes through the camera fixing structure 322 and the light source fixing structure 332, the CCD camera 321 passes through the light source fixing structure 332, the LED light source 331 and the CCD camera 321 are vertically imaged on the same surface, and the controller 1 is connected with the liquid injection tube 31 through a liquid conveying tube 5.
The CCD camera 321 for collecting images in the invention belongs to a vertically placed product which can observe and analyze a surface plane, and even if the product is provided with a concave surface or a convex surface, when liquid is dripped on the surface of the product, the contact angle of the liquid on the concave surface or the convex surface can be observed and analyzed due to the fact that the LED light source and the CCD camera 321 are vertically imaged on the same plane, so that the hydrophobicity/hydrophilicity of the material can be judged.
The controller 1 comprises a control board 11, a converter 12 connected with the control board 11 and controlled by the control board 11, and a pressure pump 13, wherein the pneumatic pipeline 4 is connected with the control board 11 through the converter 12, the pressure pump 13 is also connected with the liquid storage pressure bottle 2 through the pneumatic pipeline 4, and the tester controls dropping liquid through the pneumatic pipeline and measures a contact angle through a contour contrast method. The converter 12 may effect conversion of data. The invention controls the liquid drop through the pneumatic pipeline 4, controls the air pressure through the controller 1 to accurately control the liquid flow, ensures uniform and stable liquid outlet, meets the test precision requirement of the customer product, is simple to operate, and can achieve the use purpose through setting parameters. When the liquid dripping device is used, the pressure provided by the pressure pump 13 is set on the control board 11, then the tester is started, and under the pressure provided by the pressure pump 13, liquid enters the liquid conveying pipe 5 from the liquid storage pressure bottle 2 and is conveyed into the liquid injection pipe 31 through the liquid conveying pipe 5, so that the liquid dripping operation is realized.
The contour contrast method comprises the following specific operations: before dripping, the controller 1 firstly collects a frame of image, after the liquid is dripped into a product in a non-contact manner by the liquid storage pressure bottle 2, then collects a frame of image, records a state diagram of the liquid on the surface of the product, compares two images before and after dripping to obtain the contour size and the position of the liquid, and then carries out analysis fitting on the images to calculate the contact angle degree.
Wherein the analytical fitting of the images is based on a computational model which minimizes the energy of the liquid under the combined action of the liquid tension and the solid surface energy, i.e
Wherein:
gamma: representing the gravity per unit volume;
z=z (r) represents the liquid surface equation;
sigma: surface energy per unit area;
ds：representing a unit length;
drip out liquidIs a known value, and depends on the air pressure of the controller on water, the radius of the titration head and the titration time, wherein the relation between the air pressure and the liquid flow rate is expressed by Bernoulli equation that p+ρgz+0.5 ρv 2 Calculation of =c;
determining the final shape of a liquid also requires measuring the contour of the liquid on the surface of the product material, i.e. the surface equation z=z (r), r 2 ＝x 2 +y 2 I.e. obtained by image analysis, as shown in fig. 7.
The specific process of controlling the dropping liquid by the pneumatic pipeline is as follows: the controller 1 controls the pressure of the gas outputted from the pneumatic line 4 according to the set pressure, and the reservoir pressure bottle 2 delivers the liquid to the liquid injection tube 31 under the pressure of the gas to perform the liquid dropping. The controller 1 is used for controlling the air pressure to accurately control the liquid flow, so that the liquid outlet is ensured to be uniform and stable, the test precision requirement of a customer product is met, the operation is simple, and the use purpose can be achieved by setting parameters. The liquid can be pure water or pure liquid (better flowability) to be tested.
The gas in the pneumatic line 4 is air. The drop imaging host 3 is provided with a one-key test switch, and when in use, the test program can be started only by pressing the switch. When the image is acquired, the clear image is extracted through a top view automatic focusing mode.
After the liquid injection tube 31 drops the liquid onto the product, the dropped liquid is located below the CCD camera 321, so that the contact angle of the liquid drop on the product can be easily observed and analyzed.
The working principle of the invention is as follows: the liquid drops are automatically injected by controlling air pressure, the optical principle that the LED light source on the top surface and the CCD camera 321 are vertically imaged on the same surface is adopted for testing, the testing data are compared for analysis and calculation, the CCD camera 321 shoots downwards from the top, the form of the liquid on the plane, the concave surface or the convex surface can be shot, the 3D model state of the liquid on the surface of a product is tested, and the correct measurement result data are obtained through algorithm fitting analysis. The main invention points of the invention are as follows:
1. the test liquid is delivered through a pneumatic line controlled by pneumatic pressure.
2. The air pressure control realizes automatic injection of liquid drops and liquid drop precision.
3. The imaging extracts clear images through a top-view automatic focusing mode.
4. And (5) automatically judging the performance of the data product and analyzing the report through an image analysis test.
5. And placing the equipment host on the product, and clicking a test button to complete the test.
The invention adopts the CCD camera 321 to observe the state (top view contact angle) of the liquid drop on the surface of the product from top to bottom in real time, and analyzes and calculates the contour model of the liquid drop which is dropped on the surface of the sample, and has at least the following advantages:
firstly, the portable product can not only meet the performance detection of surface wetting of a conventional horizontal product, but also test the product with the concave-convex surface;
secondly, the mechanical detection performance is stable, the quality of products is ensured, and the accuracy of experimental research data is ensured;
thirdly, the analysis speed is high, so that the production efficiency can be improved;
fourth, small size can be well docked production equipment to automatically test, and the automatic docking production equipment can realize online water drop angle test.
Variations and modifications to the above would be obvious to persons skilled in the art to which the invention pertains from the foregoing description and teachings. Therefore, the invention is not limited to the specific embodiments disclosed and described above, but some modifications and changes of the invention should be also included in the scope of the claims of the invention. In addition, although specific terms are used in the present specification, these terms are for convenience of description only and do not limit the present invention in any way.
Claims (8)
1. The utility model provides a portable miniature contact angle tester which characterized in that: including controller, deposit hydraulic pressure bottle and dropping liquid imaging host computer, the controller pass through pneumatic line with deposit hydraulic pressure bottle and be connected, dropping liquid imaging host computer includes liquid injection tube, CCD camera structure and LED light source structure, CCD camera structure includes CCD camera and camera fixed knot construct, LED light source structure includes LED light source and light source fixed knot construct, camera fixed knot constructs and is located light source fixed knot constructs the top, the one end of liquid injection tube passes in proper order camera fixed knot constructs with light source fixed knot constructs, the CCD camera passes light source fixed knot constructs, the LED light source with CCD camera homofacial vertical imaging, the controller pass through the liquid conveyer pipe with liquid injection tube connects.
2. The portable miniature contact angle tester as claimed in claim 1, wherein: the controller comprises a control board, a converter and a pressure pump, wherein the pneumatic pipeline is connected with the control board through the converter, the pressure pump is also connected with the liquid storage pressure bottle through the pneumatic pipeline, and the tester is used for controlling dropping liquid through the pneumatic pipeline and measuring a contact angle through a contour contrast method.
3. The portable miniature contact angle tester of claim 2, wherein the contour contrast method specifically operates as: before dropping, the controller firstly collects a frame of image, after the liquid is dropped onto a product in a non-contact hanging manner by the liquid storage pressure bottle, then collects a frame of image, records a state diagram of the liquid on the surface of the product, compares two images before and after dropping to obtain the contour size and the position of the liquid, and then carries out analysis fitting on the images to calculate the contact angle degree.
4. The portable micro contact angle tester according to claim 3, wherein the analytical fitting of the graph is based on a computational model that minimizes the energy of the liquid under the combined action of the liquid tension and the solid surface energy, namely
Wherein:
gamma: representing the gravity per unit volume;
z=z (r) represents the liquid surface equation;
sigma: surface energy per unit area;
ds：representing a unit length;
drip out liquidIs of known value, depends on the pressure of the water, the radius of the titration head and the titration time of the controller, wherein the relation between the pressure and the liquid flow rate is expressed by Bernoulli equation, p+ρgz+0.5 ρv 2 Calculation of =c;
determining the final shape of a liquid also requires measuring the contour of the liquid on the surface of the material, i.e. the surface equation z=z (r), r 2 ＝x 2 +y 2 I.e. obtained by image analysis.
5. The portable micro contact angle tester according to claim 3, wherein the specific process of controlling the dropping liquid by the pneumatic pipeline is as follows: the controller controls the pressure of the gas output from the pneumatic pipeline according to the set pressure, and the liquid storage pressure bottle conveys liquid to the liquid injection tube for liquid dripping under the gas pressure.
6. The portable micro contact angle tester of claim 3, wherein the gas in the pneumatic line is air.
7. The portable miniature contact angle tester as claimed in claim 1, wherein: the drop imaging host is provided with a one-key test switch.
8. The portable miniature contact angle tester as claimed in claim 1, wherein: after the liquid injection tube drips liquid onto the product, the drips liquid is positioned below the CCD camera.
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| CN202311067211.2A CN116858729B (en) | 2023-08-23 | 2023-08-23 | Portable miniature contact angle tester |
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| CN202311067211.2A CN116858729B (en) | 2023-08-23 | 2023-08-23 | Portable miniature contact angle tester |
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| CN116858729B CN116858729B (en) | 2024-01-02 |
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| CN116858729B (en) | 2024-01-02 |
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