Automatic detection method of static contact angle

A static contact angle, automatic detection technology, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of not being able to automatically obtain the anti-interference ability of the water drop edge, poor practicability, and not strong

Inactive Publication Date: 2011-03-16
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0006] In order to solve the problem that the above technology cannot automatically obtain the water drop edge or the anti-interference ability is not strong and the practicability is poor when the water drop edge is automatically obtained, the present invention provides an automatic high-precision water drop static contact angle Measurement methods

Method used

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  • Automatic detection method of static contact angle
  • Automatic detection method of static contact angle
  • Automatic detection method of static contact angle

Examples

Experimental program
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Effect test

Embodiment 1

[0064] This embodiment verifies the effect of the simulated water drop image.

[0065] Such as Figure 2a As shown, the simulated droplet image with a contact angle of 110°, and the image obtained after 1350 iterations of fitting by the level set method, such as Figure 2b shown.

[0066] In the range of 2000 iterations, after every 50 times, the droplet edge obtained by the level set method is fitted by the above method, and the one with the smallest fitting error is selected. The corresponding static contact angle is 110.41°, which is only 110° from the theoretical value. The difference is 0.41°. The reason for the error is that the obtained edge is the peripheral curve of the droplet edge, and the error will be further reduced as the image resolution increases. The simulated droplet image belongs to the case where the edge is sufficiently clear, which also shows that the present invention can obtain the static contact angle with very high accuracy if the edge of the dropl...

Embodiment 2

[0068] The water drop image in this example is obtained on the RTV silicone rubber coating with deionized water droplets. The thickness of the coating is about 3mm, and the volume of the water drop is about 5μL. Taking pictures of the water drops, the obtained image has 3648 pixels in the horizontal direction and 2736 pixels in the vertical direction. Such as image 3 As shown, the edge of the visible water drop image is not particularly clear, especially at the junction of gas, liquid, and solid, which makes it difficult to automatically obtain accurate contact angles.

[0069] The water drop edge obtained by the level set under different calculation times is as attached Figure 4a ~d, where the edge of the water drop is represented by a black line in the figure. The level set under different iterations will get different edges. When the number of iterations is small, the curve obtained will be larger than the edge of the water drop. When the number of iterations is too lar...

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Abstract

The invention provides an automatic detection method of static contact angle, including that: a digital camera or CCD sensor is combined with an image acquisition card to capture a water drop image on the plane vertical to the plane where material is located after dripping is completed, and a level set based geometric active contour model method is carried out on the image, so as to obtain a water drop edge; least square fitting is carried out on the edge obtained by the level set every certain iterations, so as to obtain circle parameters, and the obtained minimum curve error is namely the final water drop edge. According to the parameters, tangent lines at junction points of solid, liquid and gas are obtained, thus the static contact angle can be obtained. The invention has the advantages that contact angle can be automatically obtained, accuracy is high and antijamming capability is strong.

Description

technical field [0001] The invention belongs to the field of material performance testing and relates to an automatic detection method of a static contact angle. Background technique [0002] Pollution flashover occurs frequently in the external insulation of the power system, which affects the normal operation of the power system. Composite insulators based on high temperature vulcanized silicone rubber materials and RTV (Room Temperature Vulcanization) antifouling coatings based on room temperature vulcanized silicone rubber materials are considered to be effective measures to suppress pollution flashover in power systems, so they are widely used in external insulation of power systems . The main reason why silicone rubber can inhibit pollution flashover is that it has strong hydrophobicity and hydrophobic migration characteristics. The influence of these two characteristics of silicone rubber materials on various factors is of great significance to the suppression of pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N13/00
Inventor 徐志钮律方成刘云鹏王胜辉李和明
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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