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Anti-interference static contact angle calculation method

A technology of static contact angle and calculation method, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of low calculation accuracy and insufficient anti-interference ability, and achieve high calculation accuracy, strong anti-interference ability, and wide application range Effect

Inactive Publication Date: 2013-09-25
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to propose an anti-interference static contact angle calculation method for the low calculation accuracy of the existing single static contact angle algorithm mentioned in the above background technology and insufficient anti-interference ability to solve the above-mentioned problems. question

Method used

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  • Anti-interference static contact angle calculation method

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Effect test

Embodiment 1

[0157] In this example, the liquid type is selected as water, the volume is 1 μL, and the critical contact angle θ of the circle fitting algorithm is 1 , the critical contact angle θ of the ellipse fitting algorithm 2 and the critical contact angle θ of the ADSA-P algorithm 3 The value of is shown in Table 1, and the critical droplet volumes of the circle fitting algorithm and the ellipse fitting algorithm are shown in Table 2.

[0158]

[0159] Table 1. Critical contact angles of the three algorithms

[0160] The water droplet images of materials with poor hydrophobicity are more likely to be disturbed. The calculation results of the circle fitting algorithm, ellipse fitting algorithm and ADSA-P algorithm are shown in the attached Image 6 shown. attached by Image 6 (b) It can be seen that for such a water drop image with a small contact angle and a small volume, the circle fitting algorithm can accurately fit the edge of the water drop. Even if it is disturbed to a c...

Embodiment 2

[0167] attached by Figure 8 It can be seen that for the 2 μL water droplet image of the hydrophilic sample, the circle fitting algorithm and the ellipse fitting algorithm have good fitting effects, and the calculation results of the contact angle are similar. According to their hydrophobicity combined with Table 2, it can be seen that their calculation accuracy is guaranteed . The fitting effect of ADSA-P algorithm is slightly worse, and the calculation results produce errors. The user's estimated contact angle value is ≈65°, according to the attached Figure 5 As can be seen from the flow chart of the present invention and Tables 1 and 2, in this case, the circle fitting algorithm is selected, and the calculation accuracy of the present invention is guaranteed. attached by Figure 9 It can be seen that for the water drop image of 20 μL hydrophilic sample, the fitting effect of the circle fitting algorithm and the ADSA-P algorithm is not good, and the error of the circle f...

Embodiment 3

[0169] attached Figure 10 The fitting effect of the circle fitting algorithm, ellipse fitting algorithm and ADSA-P algorithm is very good, and the static contact angle of the calculated water droplets is also very close. Combining the fitting and calculation results with the previous analysis, we can know their calculation results are more accurate. The user's estimated contact angle value is ≈102°, according to the attached Figure 5 As can be seen from the flow chart of the present invention and tables 1 and 2, in this case the present invention will select the ellipse fitting algorithm to calculate the static contact angle of water droplets, therefore, its accuracy is guaranteed, and it can be seen from table 3 that its speed is the fastest. Therefore, in this case, the present invention has higher accuracy and faster calculation speed. attached by Figure 11It can be seen that for hydrophobic samples with large water droplet volume, the fitting effect of the circle fit...

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Abstract

The invention discloses an anti-interference static contact angle calculation method in the technical field of material performance test. The method comprises the following steps: acquiring a droplet image; and extracting a droplet edge, and selecting an optimal contact angle algorithm according to the actual droplet volume, a contact angle value predicted by a user and a critical droplet volume value so to calculate to work out the static contact angle of droplets. Since the optimal static contact angle algorithm is selected according to actual conditions, the method has high interference resistance and ensures both high calculation accuracy and high calculation speed; moreover, the method can aim at different droplet volumes and contact angles and is wide in application range.

Description

technical field [0001] The invention belongs to the technical field of material performance testing, in particular to an anti-interference static contact angle calculation method. Background technique [0002] The surface energy of materials is an important parameter to characterize the performance of materials. Materials with low surface energy have strong hydrophobicity and are widely used in ship antifouling, antifouling flashover in power systems, anti-icing, self-cleaning materials, etc. . Surface energy is a key property of these materials, and the surface energy of a material can be obtained by measuring the contact angle. Therefore, accurate measurement of contact angle has broad significance. [0003] At present, the sessile drop method is commonly used to measure the static contact angle. After the droplet image is acquired through the imaging system, the key part is the algorithm of the contact angle. The circle fitting algorithm, the ellipse fitting algorithm a...

Claims

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Application Information

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IPC IPC(8): G01N13/00
Inventor 徐志钮律方成
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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