Defect identification method of eddy current thermal imaging based on similarity analysis of three-dimensional temperature surface
A similarity analysis and three-dimensional temperature technology, applied in the field of eddy current thermal imaging non-destructive testing, can solve the problems of high labor intensity for operators, immature research on thermal image recognition algorithms, and no method for identifying defects, etc., to achieve light labor The effect of improving the detection efficiency
Inactive Publication Date: 2017-12-05
WUHAN UNIV OF TECH
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Problems solved by technology
[0005] (1) It is necessary to manually screen thermal images for analysis and comparison to identify defects. As the number of inspections increases, the labor intensity of operators is high;
[0006] (2) The research on the recognition algorithm of the thermal image is not yet mature, and the method for automatic operation of the machine to identify the defect has not yet been proposed
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[0030] In order to make the content and technical solutions of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0031] The eddy current thermal imaging defect recognition method based on the similarity analysis of the three-dimensional temperature surface in the embodiment of the present invention, such as figure 1 shown, including the following steps:
[0032] S1. Use eddy current to heat the test piece to be tested, and use an infrared thermal imager to record the temperature change on the surface of the test piece to obtain its thermal images at different times;
[0033] S2. Establish a three-dimensional temperature surface of the test piece according to the information of the thermal image, and then calculate the normal vectors of each point on the three-dimensional temperature surface to form a normal vector matrix;
[0034] S3. Perform a similarity analysis between the normal ...
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The invention discloses a method for identifying defects in eddy current thermal imaging based on similarity analysis of three-dimensional temperature curved surfaces, wherein the method includes eddy current heating of a test piece, acquisition of a thermal image of the surface of the test piece, establishment of a three-dimensional temperature curved surface, and a method for calculating the curved surface Vector matrix, calculating the angle matrix and discriminant matrix of the surface, similarity analysis of the surface, defect identification of the test piece, etc. The invention proposes the concept of three-dimensional temperature surface, introduces it into the field of eddy current thermal imaging detection, and adopts the mathematical method of matrix as an analysis tool, which can conveniently realize the automatic identification of defects by computer and get rid of the dependence on manual screening of thermal images , reduce the workload of the operator and improve the efficiency of detection.
Description
technical field [0001] The invention relates to the field of non-destructive testing of eddy current thermal imaging, in particular to a defect identification method and system of eddy current thermal imaging based on similarity analysis of three-dimensional temperature surfaces. Background technique [0002] Eddy current thermal imaging detection technology is a combination of eddy current detection technology and thermal imaging detection technology. Its principle is: when the coil carrying high-frequency alternating current is close to the conductor specimen, due to the phenomenon of electromagnetic induction, eddy current will be induced on the surface or inside of the specimen; According to Joule's law, part of the eddy current will be converted into Joule heat; the heat will propagate inside the test piece, and due to the existence of defects, the temperature distribution on the surface of the test piece will be uneven; use the infrared recorder to obtain the thermal im...
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IPC IPC(8): G01N25/72
Inventor 刘志平柯亮刘兴乐
Owner WUHAN UNIV OF TECH