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Automatic detection method of static contact angle and dynamic contact angle

A technology of static contact angle and dynamic contact angle, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of doubling workload and calculation time, and achieve high accuracy, high calculation accuracy, and improved accuracy

Inactive Publication Date: 2013-01-09
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Doubling the workload and computing time

Method used

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

Examples

Experimental program
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Embodiment Construction

[0027] See attached figure 1 , the steps of applying the present invention are:

[0028] (1) Use a digital camera or a CCD camera in combination with an image acquisition card to take pictures of the water droplets on the material, and the camera plane is perpendicular to the material plane;

[0029] (2) The obtained water drop image is obtained based on the level set method to obtain the water drop edge;

[0030] (3) According to the circle, ellipse fitting and polynomial fitting, the edge of the droplet near the needle tube is fitted, and the error is judged as the static contact angle, the image of the advancing angle or the image of the receding angle. If the former is smaller than the latter, it is static contact angle or advancing angle image; otherwise receding angle image;

[0031] (4) When calculating the static contact angle or advancing angle, select the circle fitting method or the ellipse fitting method, select the edge to be fitted according to the fitting erro...

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Abstract

The invention discloses an automatic high-accuracy droplet calculation method of dynamic and static contact angles. The method of the invention is realized by obtaining the droplet edge of a shot clear drop image with a level set method and judging whether the image is a static contact angle, an advancing angle or a receding angle. For a static contact angle image, if the droplet is large in size, an ellipse fitting method should be employed, while if the droplet size and the contact angle are both small, a circle fitting algorithm is chosen. If to calculate an advancing angle, a circle fitting or ellipse fitting algorithm is chosen. If to calculate a receding angle, a polynomial fitting algorithm is employed. By obtaining the tangent of a curve resulting from fitting at a droplet marginal point corresponding to a triplet, two contact angles respectively on the left and right are then obtained. The average of the two contact angles is a final contact angle. According to the method of the invention, dynamic and static contact angles can be calculated rapidly and automatically, with high rate of accuracy.

Description

technical field [0001] The invention relates to an automatic algorithm of static contact angle and dynamic contact angle for hydrophobicity detection, which belongs to the field of material performance testing. Background technique [0002] Porcelain and glass insulators are made of hydrophilic materials, which have small surface resistance in the case of pollution and wetness, resulting in low pollution flashover voltage. Silicone rubber has hydrophobicity and water-repellent migration characteristics, and still has a high surface resistance in a dirty and wet environment, so it has a high pollution flashover voltage. Composite insulators and room temperature vulcanization (RTV) silicone rubber coatings are composed of silicone rubber materials, which have strong anti-pollution flashover capabilities and are widely used in external insulation of power systems. Hydrophobicity is a key characteristic of silicone rubber materials, and the surface of silicone rubber is easily ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N13/00
Inventor 徐志钮律方成刘云鹏赵涛李和明
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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