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Metal surface oxide layer thickness monitoring method based on optical image

A technology of oxide layer thickness and metal surface, which is applied in the field of power system, can solve the problems of damage to power equipment, low efficiency, high efficiency, etc., and achieve the effect of high detection efficiency

Pending Publication Date: 2020-10-27
GUANGDONG POWER GRID CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the problems of low efficiency and damage to electrical equipment in the prior art of measuring the thickness of the oxide layer on the metal surface by ultrasonic waves, the present invention provides a method for monitoring the thickness of the oxide layer on the metal surface based on optical images. method to measure the thickness of the oxide layer on the metal surface, no need to treat the surface of the power equipment, and the detection efficiency is high

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  • Metal surface oxide layer thickness monitoring method based on optical image
  • Metal surface oxide layer thickness monitoring method based on optical image
  • Metal surface oxide layer thickness monitoring method based on optical image

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Experimental program
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Embodiment 1

[0036] Such as figure 1 Shown is an embodiment of a method for monitoring the thickness of an oxide layer on a metal surface based on an optical image, and the specific steps are as follows:

[0037] Step 1: acquiring images of oxide layers with different oxide layer thicknesses;

[0038] Step 2: extracting the chromaticity information of the image in step 1;

[0039] S2.1: Select an analysis area consisting of M×N pixels in the image, and extract the gray level of each pixel of the blue primary color in the analysis area;

[0040] S2.2: Calculate the ratio of the number of pixels of a certain gray level of the blue primary color in the analysis area to the total number of pixels in the analysis area to obtain the frequency of a certain gray level. The specific formula is:

[0041]

[0042] Among them, i is the gray level; NumB(i) is the number of pixels of gray level i; M×N is the total number of pixels.

[0043] S2.3: Repeat step S2.2 until the frequency distribution o...

Embodiment 2

[0050] Another embodiment of a method for monitoring the thickness of an oxide layer on a metal surface based on an optical image, the specific steps are as follows:

[0051] Step 1: acquiring images of oxide layers with different oxide layer thicknesses;

[0052] Step 2: extracting the chromaticity information of the image in step 1;

[0053] S2.1: Select multiple analysis areas consisting of M×N pixels in the same image, and extract the gray level of each pixel of the blue primary color in the analysis area;

[0054] S2.2: Calculate the ratio of the number of pixels of a certain gray level of the blue primary color in the analysis area to the total number of pixels in the analysis area to obtain the frequency of a certain gray level. The specific formula is:

[0055]

[0056] Among them, i is the gray level; NumB(i) is the number of pixels of gray level i; M×N is the total number of pixels.

[0057] S2.3: Repeat step S2.2 until the frequency distribution of all gray lev...

Embodiment 3

[0065] Another embodiment of a method for monitoring the thickness of an oxide layer on a metal surface based on an optical image. On the basis of Embodiment 1 and Embodiment 2, the specific process of step 1 is limited, and the specific steps are as follows:

[0066] In the first step, multiple groups of images with different oxide layer thicknesses are taken on the same device at different times and under the same lighting conditions, and are marked as different oxide layer thicknesses. By acquiring data from a certain device on site, the acquired data is closer to the actual work, but it takes a long time.

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Abstract

The invention relates to the field of power equipment detection, and relates to a metal surface oxide layer thickness monitoring method based on an optical image, which comprises the following steps:1, acquiring images of oxide layers under different oxide layer thicknesses; 2, extracting chrominance information of the image in the step 1; 3, an oxide layer thickness database is built according to the chrominance information of the image in the step 2, and in the database, different chrominance information corresponds to different oxide layer thicknesses; 4, monitoring the to-be-detected equipment by using shooting equipment, and shooting the metal surface of the to-be-detected equipment at regular time to obtain an image; and step 5, extracting chromaticity information of the image and comparing the chromaticity information with data in the oxide layer thickness database to determine the oxide layer thickness corresponding to the image. The thickness of the oxide layer on the metal surface can be judged by shooting the metal surface of the equipment without any operation on the equipment or building responsible mechanical hardware, so that the detection of the thickness of the oxide layer on the metal surface is more efficient, and the equipment cannot be damaged.

Description

technical field [0001] The invention relates to the technical field of power systems, and more particularly, to a method for monitoring the thickness of an oxide layer on a metal surface based on an optical image. Background technique [0002] Copper power equipment is easily oxidized in outdoor working environments. The thickness of the oxide layer formed by the oxidation degree is different, and the thickness of the oxide layer will affect the mechanical and electrical properties of the equipment. Therefore, by obtaining the thickness of the oxide layer of the equipment It is of great significance to judge the working state of the equipment. The patent publication with the application number "CN201210467344.4" discloses a method for measuring the thickness of the metal layer and oxide layer on the tube wall of the heating surface of the boiler. Grind the surface of the heating surface tube to be tested, and apply coupling agent; place the high-frequency shear wave straigh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00G06T7/90G01B11/06
CPCG06T7/0004G06T7/90G01B11/0616
Inventor 杜文娇汤振鹏许巧云裴运军陈小慧桂盛青叶齐政李辰盟朱文超朱跃胜何旸
Owner GUANGDONG POWER GRID CO LTD