A method for evaluating the modification effect of plasma material based on color enhancement

Abstract

The application discloses a kind of plasma material modification effect evaluation methods based on color enhancement, including the gray scale picture of surface treatment after modification is divided into multiple levels according to gray scale;The RGB data of each level is set;Multiple color step descriptions are generated;The higher the color step, the warmer the corresponding color;The collected picture is enhanced to multiple color step color two-dimensional picture; the surface water contact angle and flashover voltage test are carried out on different color level areas of multiple multiple color step color two-dimensional pictures, to obtain the breakdown voltage range of the water contact angle range and flashover voltage test of material surface;Set the water contact angle range and breakdown voltage range corresponding to each color step;Give the control table of the rapid evaluation modification effect based on multiple color enhancement method;After the picture of plasma modified material surface to be evaluated is collected and enhanced, the rapid diagnosis and evaluation of modification effect based on the control table.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of plasma modification effect evaluation, and particularly relates to a plasma material modification effect evaluation method based on color enhancement. BACKGROUND

[0002] With the rapid development of low-temperature plasma technology, plasma modification has been widely applied in material modification to customize the physical form and chemical composition of the material surface, effectively improving the physical and chemical (surface roughness, wettability, etc.) and electrical (conductivity, flashover voltage, etc.) properties. Especially for polymethyl methacrylate (PMMA), epoxy resin (ER), silicone rubber (SIR) and some high polymer electric insulating materials, they are facing multiple challenges such as harsh environment, concentrated field, overvoltage flashover, etc. Therefore, improving the insulating surface with high hydrophobicity and high electrical insulation performance has become a research hotspot in recent ten years. With the help of specific reaction medium in plasma, plasma enhanced chemical vapor deposition (PECVD) is essentially to manufacture functional coating on insulating substrate, thereby improving water resistance and electrical insulation performance.

[0003] However, plasma treatment cannot always meet the initial ideal requirements of the operator, and the modification effect is seriously affected by the plasma reactor, discharge mode, experimental conditions and treatment mode, especially on the two-dimensional plane of large-size insulator, the growth rate of plasma deposition film may be different at different positions, resulting in uneven modification effect. The uneven film deposition on the surface of the material not only cannot adjust the performance of the whole surface, but also introduces physical and chemical defects due to the unevenness of the composition, causing the accumulation of electric charge and reducing the electrical insulation performance, thereby leading to the secondary failure of electrical insulation. Therefore, characterizing and evaluating the modification effect and uniformity of the material surface is of great significance for further promoting the industrial application of plasma and improving the modification effect of plasma.

[0004] At present, under laboratory conditions, the surface modification of plasma insulating materials is limited by the size of the reactor, and the treatment area is small. Therefore, when investigating the surface modification effect of insulating materials, it is easy to test the physicochemical properties, hydrophobicity, flashover voltage, etc. However, these detection methods are generally single-point measurements, which cannot meet the surface performance characterization of large-area materials. At present, griding and multi-point sampling methods can be used to test different positions of large-area materials, but this method is low in efficiency and high in time cost, which seriously limits the evaluation efficiency of large-area industrial modification, and it is more difficult to intuitively reflect the plasma modification effect. In addition, the misoperation in the detection process may damage the quality of the modified film to a certain extent. There is an urgent need for a modification effect evaluation method suitable for large-area and batch modification to realize the rapid diagnosis and evaluation of plasma material modification effect.

[0005] The prior art with the publication number CN106296648B discloses a method for evaluating the relationship between plasma and final modification effect during laser modification, sends the image to the processing software, extracts the feature information, and obtains the corresponding relationship between the feature information and the laser modification effect, but this method can only reflect the area of the laser modification region, and lacks the corresponding relationship between the image information and the modification effect.

[0006] The prior art with the publication number CN1379459A discloses a device for evaluating a polycrystalline silicon thin film, obtains a thin film surface image through multi-angle shooting, and evaluates the features of the thin film surface structure from the surface image, which is relatively cumbersome and requires a high instrument, and is not suitable for detection of large-scale thin film modification.

[0007] The prior art with the publication number CN114144654 discloses a surface characteristic evaluation method, a surface characteristic evaluation device, and a surface characteristic evaluation program, sprays a fluorescent substance on the surface of the processed material and performs multi-angle shooting to obtain the surface characteristics. However, the added fluorescent substance floats on the surface of the material, which is prone to interface incompatibility, and can only macroscopically represent the change of the material surface morphology, and is not suitable for monitoring the modification effect of the plasma insulating material surface.

[0008] Therefore, the present application provides a plasma material modification effect evaluation method based on color enhancement, quantizes the surface film of the material after plasma modification and gives 9-order colors, and simultaneously gives the water contact angle and flashover voltage size range reflected by the 9-order colors, to avoid repetitive testing and realize online evaluation of the modification effect. SUMMARY

[0009] 1. The technical problem to be solved:

[0010] In view of the above technical problems, the present application provides a plasma material modification effect evaluation method based on color enhancement, gives 9-order colors reflecting the modification effect of the material surface, and provides the corresponding relationship between each order color and the water contact angle and the flashover voltage, to further provide the possibility of online evaluation of the modification effect of the plasma film deposition.

[0011] 2. Technical solution:

[0012] A plasma material modification effect evaluation method based on color enhancement, characterized by comprising the following steps:

[0013] Step 1: photographing the material surface after plasma modification to obtain a material surface picture, and performing gray scale processing on the picture to obtain a gray scale picture; then, each pixel in the gray scale picture is divided into multiple levels according to its corresponding gray scale; and the RGB data of each level is set, i.e., each level corresponds to different three primary colors RGB components;

[0014] Step two: define the enhanced color description of each level according to the corresponding RGB data value of the level, so as to generate a multi-color level description; the higher the color level, the warmer the corresponding color;

[0015] Step three: based on the color enhancement of steps one and two, the collected picture is processed to realize the conversion of the gray information of the material surface film which is not easy to be identified into a multi-color level color two-dimensional picture with high contrast and easy to be identified by naked eyes;

[0016] Step four: test the surface water contact angle and flashover voltage of different color level areas of a plurality of multi-color level color two-dimensional pictures, and obtain the water contact angle range of the material surface and the breakdown voltage range of the flashover voltage test;

[0017] Step five: according to the water contact angle range and the breakdown voltage range of the flashover voltage test of the material surface obtained in step four, set the water contact angle range and the breakdown voltage range corresponding to each color level; give a control table for rapid evaluation of modification effect based on the multi-level color enhancement method;

[0018] Step six: collect the picture of the plasma modified material surface to be evaluated, and perform picture enhancement as in steps one to four, and obtain the related performance parameters of the material surface according to the control table for rapid evaluation of modification effect based on the multi-level color enhancement method, so as to realize the rapid diagnosis and evaluation of the modification effect of the plasma material; the related performance parameters of the material surface include the water contact angle range and the breakdown voltage.

[0019] Further, the plurality of levels is 9 levels, and the corresponding color level picture is a 9-color level color two-dimensional picture.

[0020] Further, the enhanced color descriptions of the 9 color levels are respectively: blue-black, dark blue, light blue, sky blue, pink, purple, yellow, orange and red; wherein the higher the color level, the more obvious the treatment effect.

[0021] Further, the blue-black color corresponds to level 1, and the gray value is 0-40 and the RGB value is R1, G0, B128;

[0022] The dark blue color corresponds to level 2, and the gray value is 40-60 and the RGB value is R0, G0, B188;

[0023] The light blue color corresponds to level 3, and the gray value is 60-80 and the RGB value is R1, G126, B255;

[0024] The sky blue color corresponds to level 4, and the gray value is 80-100 and the RGB value is R126, G255, B254;

[0025] The pink corresponds to level 5, the gray value is 100-120, the RGB value is R255, G179, B254;

[0026] The purple corresponds to level 6, the gray value is 120-140, the RGB value is R255, G0, B248;

[0027] The yellow corresponds to level 7, the gray value is 140-160, the RGB value is R255, G255, B0;

[0028] The orange corresponds to level 8, the gray value is 160-180, the RGB value is R255, G126, B0;

[0029] The red corresponds to level 9, the gray value is 180-255, the RGB value is R251, G3, B0.

[0030] Further, the water contact angle experiment is specifically that 1.5 μL of distilled water is fixed on the surface of the material to form a droplet, and the water contact angle WCA between the droplet and the material surface is calculated after 20 s of stabilization.

[0031] Further, the flashover voltage test is specifically that a finger-shaped electrode with a distance of 5 mm is used, a high-voltage direct current source is increased at a rate of 500 V / s until flashover occurs, and the breakdown voltage at this time is recorded.

[0032] 3. Beneficial effects:

[0033] (1) The method for evaluating the modification effect of plasma material based on color enhancement provided by the application can realize color enhancement of the film on the surface of the material after plasma modification through gray scale analysis, and can give 9 levels of colors reflecting the deposition of the film, and the corresponding relationship between each color and the water contact angle and the flashover voltage, so that the treatment effect of the plasma on the surface of the material can be quickly and conveniently judged.

[0034] (2) In the application, the surface of the material after plasma modification is photographed to obtain a picture with a pixel of 500x1000, and the two-dimensional data set reflecting the brightness of the film on the surface of the material is obtained by combining the R(red), G(green) and B(blue) three primary color values, which is helpful to increase the enhancement effect of the picture.

[0035] (3) In the application, the gray value is divided into 9 levels by a specific threshold value, the gray value corresponds to warm color, and the level is high, while the low gray value corresponds to cold color, and the level is low; the corresponding RGB value of different levels is set, and the surface water contact angle range and the flashover voltage test range are combined to avoid repeated test evaluation, so that the modification effect can be evaluated online. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 for a gray scale image in the specific embodiment;

[0037] Figure 2 for an image in the specific embodiment using color enhancement of the present application. DETAILED DESCRIPTION

[0038] The present application will be described in detail below with reference to the accompanying drawings.

[0039] A color enhancement-based plasma material modification effect evaluation method, characterized by comprising the following steps:

[0040] Step one: take a picture of the surface of the plasma-modified material to obtain a material surface picture, and perform gray scale processing on the picture to obtain a gray scale picture; then, each pixel in the gray scale picture is divided into multiple levels according to its corresponding gray scale; the RGB data of each level is set, that is, each level corresponds to different RGB components. This step realizes the quantization and coding of the picture.

[0041] Step two: define the enhanced color description of each level according to the corresponding RGB data value of each level, thereby generating a multi-color step description; the higher the color step, the warmer the corresponding color.

[0042] Step three: based on the color enhancement of steps one and two, the collected picture is converted into a multi-color step color two-dimensional picture with high contrast and easy to be recognized by the naked eye.

[0043] In this step, color enhancement of the plasma film is realized.

[0044] Step four: test the surface water contact angle and flashover voltage of different color level areas of multiple multi-color step color two-dimensional pictures to obtain the water contact angle range and the breakdown voltage range of the flashover voltage test of the material surface;

[0045] Step five: set the water contact angle range and breakdown voltage range corresponding to each color step according to the water contact angle range and the breakdown voltage range of the flashover voltage test of the material surface obtained in step four; and give a control table for rapid evaluation of the modification effect based on the multi-step color enhancement method.

[0046] Step six: collect a picture of the surface of the plasma-modified material to be evaluated, perform picture enhancement as in steps one to four, and obtain the related performance parameters of the material surface according to the control table for rapid evaluation of the modification effect based on the multi-step color enhancement method, so as to realize rapid diagnosis and evaluation of the modification effect of the plasma material; the related performance parameters of the material surface include the water contact angle range and the breakdown voltage.

[0047] Further, the multiple levels are 9 levels, and the corresponding color scale picture is a 9-color scale color two-dimensional picture.

[0048] Further, the enhanced color descriptions of the 9 color scales are respectively: blue-black, dark blue, light blue, sky blue, pink, purple, yellow, orange, and red; wherein the higher the color scale, the more obvious the processing effect.

[0049] Further, the blue-black corresponds to level 1, with a gray value of 0-40 and an RGB value of R1, G0, B128.

[0050] The dark blue corresponds to level 2, with a gray value of 40-60 and an RGB value of R0, G0, B188.

[0051] The light blue corresponds to level 3, with a gray value of 60-80 and an RGB value of R1, G126, B255.

[0052] The sky blue corresponds to level 4, with a gray value of 80-100 and an RGB value of R126, G255, B254.

[0053] The pink corresponds to level 5, with a gray value of 100-120 and an RGB value of R255, G179, B254.

[0054] The purple corresponds to level 6, with a gray value of 120-140 and an RGB value of R255, G0, B248.

[0055] The yellow corresponds to level 7, with a gray value of 140-160 and an RGB value of R255, G255, B0.

[0056] The orange corresponds to level 8, with a gray value of 160-180 and an RGB value of R255, G126, B0.

[0057] The red corresponds to level 9, with a gray value of 180-255 and an RGB value of R251, G3, B0.

[0058] Further, the water contact angle experiment specifically fixes 1.5 μL of distilled water on the surface of the material to form a droplet, and calculates the water contact angle WCA between the droplet and the material surface after 20 seconds of stabilization.

[0059] Further, the flashover voltage test specifically uses a finger electrode with a distance of 5 mm, and a high-voltage DC source increases at a rate of 500 V / s until flashover occurs, and records the breakdown voltage at that time.

[0060] In order to limit the range of water contact angle and flashover voltage corresponding to each color scale, the inventors conducted a large number of experiments, and obtained the range of water contact angle of the surface after plasma treatment as 60-150°, and the range of flashover voltage as 60-13 kV; the obtained range of water contact angle and flashover voltage is respectively graded, that is, each color scale corresponds to a certain range, and the specific values are shown in the following table:

[0061] 9th color scale and material surface performance comparison table

[0062] Parameter Class 1 Class 2 Class 3 Class 4 Class 5 Class 6 Class 7 Class 8 Class 9 Color description Blue-black Dark blue Light blue Sky blue Pink Purple Yellow Orange Red Water contact angle (°) 60～73 74～86 87～98 99～111 112～121 122～129 130～134 135～140 141～150 Flashover voltage (kV) 6.0～6.6 6.7～7.1 7.2～8.2 8.3～9.1 9.2～9.6 9.7～10.1 10.2～11 11.1～11.8 11.9～13

[0063] Examples and verification examples:

[0064] As shown in the attached Figure 1 , it is the original picture of the collected material surface after plasma modification, which is usually a photo with 500x1000 pixels; the gray value of each pixel in the picture is extracted, and the darker part in the original picture may have poorer processing effect, and the processing effect needs to be evaluated. According to the gray value, all gray intervals are graded, and we usually divide them into 9 levels, and preset the corresponding RGB value in each grade, so as to supplement the color on the basis of gray value and generate the corresponding 9 color scales, and generate the color-enhanced picture, as shown in the attached Figure 2 , Figure 2 , 9 color scales are generated.

[0065] The surface water contact angle and flashover voltage of different color level areas are tested. In the water contact angle test, 1.5 μL of distilled water is fixed on the material surface to form a droplet, and the water contact angle (WCA) between the droplet and the material interface is calculated after 20 s of stabilization; in the flashover voltage test, the finger-shaped electrode with a distance of 5 mm is used, and the high-voltage direct current source is increased at a rate of 500 V / s until flashover occurs, and the breakdown voltage at this time is recorded.

[0066] The surface water contact angle and flashover voltage test results of the attached Figure 2 picture are as follows:

[0067] The water contact angle of region 1 (R1, G0, B128) is about 61°, and the average flashover voltage is about 6.4 kV. As the color warms up, the water contact angle of region 2 (R0, G0, B188) is about 74.4°, and the average flashover voltage is about 6.8 kV; the water contact angle of region 3 (R1, G126, B255) is about 88.7°, and the average flashover voltage is about 7.3 kV; the water contact angle of region 4 (R126, G255, B254) is about 107°, and the average flashover voltage is about 8.4 kV; the average water contact angle of region 5 (R255, G179, B254) increases to 121°, and the surface hydrophobic modification is basically achieved; the average flashover voltage of region 5 also increases to 9.6 kV. As the color further warms up, the water contact angle of region 6 (R255, G0, B248) is about 127°, and the average flashover voltage is about 9.9 kV; the water contact angle of region 7 (R255, G255, B0) is about 133°, and the average flashover voltage is about 10.2 kV; the water contact angle of region 8 (R255, G126, B0) is about 139°, and the average flashover voltage is about 11.4 kV; the water contact angle of region 9 (R251, G3, B0) reaches 143°

[0068] Evaluation: As can be seen from the surface water contact angle and flashover voltage test results given above, region 1 (R1, G0, B128) is the worst modified region, with the smallest water contact angle (61°) and the lowest flashover voltage (6.4 kV); region 9 (R251, G3, B0) is the best modified region, with the largest water contact angle (139°) and the highest flashover voltage (11.4 kV). The performance of the best modified region 9 is improved by 138.3% and 106.6% compared with the surface of the unmodified material, respectively.

[0069] Although the present application has been disclosed in preferred embodiments as above, they are not intended to limit the present application, and any person skilled in the art can make various changes or modifications without departing from the spirit and scope of the present application, therefore the protection scope of the present application should be defined by the protection scope of the claims of the present application.

Claims

1. A method for evaluating the effect of plasma material modification based on color enhancement, characterized by: The method comprises the following steps: Step 1: Taking a picture of the surface of the plasma-modified material to obtain a material surface picture, and performing gray scale processing on the picture to obtain a gray scale picture; each pixel in the gray scale picture is divided into multiple levels according to its corresponding gray scale; RGB data of each level is set, that is, each level corresponds to different RGB components; Step 2: Defining the enhanced color description of each level according to the corresponding RGB data value of each level to generate a multi-color level description; the higher the color level, the warmer the corresponding color; Step 3: Based on the color enhancement of steps 1 and 2, the collected picture is processed to convert the gray scale information of the material surface film which is not easy to be identified into a multi-color level two-dimensional picture with high contrast and easy to be identified by naked eyes; Step 4: Testing the surface water contact angle and flashover voltage of different color level regions of multiple multi-color level two-dimensional pictures to obtain the water contact angle range of the material surface and the breakdown voltage range of the flashover voltage test; Step 5: According to the water contact angle range and the breakdown voltage range of the flashover voltage test obtained in step 4, the water contact angle range and the breakdown voltage range corresponding to each color level are set; a comparison table for quickly evaluating the modification effect based on the multi-level color enhancement method is given; Step 6: Collecting the picture of the plasma-modified material surface to be evaluated, processing the picture according to the picture enhancement of steps 1 to 4, and obtaining the related performance parameters of the material surface according to the comparison table for quickly evaluating the modification effect based on the multi-level color enhancement method to realize the quick diagnosis and evaluation of the modification effect of the plasma material; the related performance parameters of the material surface include the water contact angle range and the breakdown voltage.

2. The method for evaluating the effect of plasma material modification based on color enhancement according to claim 1, characterized in that: The multiple levels are 9 levels, and the corresponding color level picture is a 9-color level two-dimensional picture.

3. The method for evaluating the effect of plasma material modification based on color enhancement according to claim 2, characterized in that: The enhanced color descriptions of the 9 color levels are respectively blue-black, dark blue, light blue, sky blue, pink, purple, yellow, orange and red; the higher the color level, the more obvious the processing effect.

4. The plasma material modification effect evaluation method based on color enhancement according to claim 3, characterized in that: The blue-black color corresponds to level 1, the gray scale value is 0-40, and the RGB value is R1, G0, B128; The dark blue color corresponds to level 2, the gray scale value is 40-60, and the RGB value is R0, G0, B188; The light blue color corresponds to level 3, the gray scale value is 60-80, and the RGB value is R1, G126, B255; The sky blue color corresponds to level 4, the gray scale value is 80-100, and the RGB value is R126, G255, B254; The pink color corresponds to level 5, the gray scale value is 100-120, and the RGB value is R255, G179, B254; The purple color corresponds to level 6, the gray scale value is 120-140, and the RGB value is R255, G0, B248; The yellow color corresponds to level 7, the gray scale value is 140-160, and the RGB value is R255, G255, B0; The orange color corresponds to level 8, the gray scale value is 160-180, and the RGB value is R255, G126, B0; The red color corresponds to a level of 9, a gray value of 180-255, and an RGB value of R251, G3, B0.

5. The method for evaluating the effect of plasma material modification based on color enhancement according to claim 1, characterized in that: The water contact angle experiment is specifically as follows: 1.5 μL of distilled water is fixed on the surface of the material to form a droplet, and the water contact angle WCA between the droplet and the material surface is calculated after 20 s of stabilization.

6. The method for evaluating the effect of plasma material modification based on color enhancement according to claim 1, characterized in that: The flashover voltage test is specifically as follows: a finger-shaped electrode with a spacing of 5 mm is used, a high-voltage direct current source is increased at a rate of 500 V / s until flashover occurs, and the breakdown voltage at this time is recorded.

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