Infrared nondestructive inspection method based on weighted stacking of time-sequence thermograph
An infrared non-destructive testing, weighted superposition technology, applied in the direction of optical testing flaws/defects, etc., can solve the problems of feature aliasing, small temperature difference, and increase the difficulty of defect detection.
Inactive Publication Date: 2014-04-16
EAST CHINA JIAOTONG UNIVERSITY
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However, the application of this detection method to the detection of superficial defects in materials still has certain limitations. The main reason is that the temperature difference between the defect area and the normal area of the tested specimen is small, which causes the characteristics of the defect area and the normal area to overlap in the infrared thermal image. Increased difficulty of defect detection
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[0027] Taking the surface hole defect detection of aluminum plate as an example, the specific implementation process is as follows:
[0028] (1) Prepare the test piece: take the aluminum plate with the length, width and thickness of 220mm, 162mm and 16mm as the object, and prepare the depth h 3mm and 5mm respectively, diameter D 8 types of hole defects, 2.5mm, 4.2mm, 6mm and 8mm, respectively, are used as the test pieces;
[0029] (2) Acquisition of time series heat map: the room temperature is 25°C, two 250W infrared radiation lamps are used to uniformly irradiate the defect surface of the test piece, and the irradiation distance is 5cm. After heating the defect surface of the aluminum plate for 20min, the infrared thermal imager is used to distance the test piece 50cm , collect the infrared time-series heat map of the specimen cooling process, the collection period is 30s, and obtain 30 frames of infrared time-series heat map;
[0030] (3) Construct the objective function:...
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Abstract
The invention discloses an infrared nondestructive inspection method based on weighted stacking of time-sequence thermograph. Firstly, the time-sequence thermograph of a heated sample during cooling is acquired in real time by using an infrared thermography, and the acquired time-sequence thermograph is greyed to obtain a time-sequence gray scale image; secondarily, the weighted sum of the pixel-value differences of the defect areas and the normal areas in the time-sequence gray scale image is used as the objective function, and the weighting coefficients are optimized by genetic algorithms to maximize the objective function value; finally the time-sequence gray scale image is subjected to weighted stacking based on the weighting coefficients, so as to obtain the stacked image capable of highlighting the defect feature information for the infrared nondestructive inspection.
Description
Technical field [0001] The invention involves an infrared lossless detection method, especially a method based on the weighted superposition of the time -sequential thermal chart. Background technique [0002] Non -destructive testing is one of the effective means to ensure the safe service of materials and components.Due to the advantages of strong anti -interference, fast real -time, intuitive, and non -contact due to strong anti -interference ability, fast real -time, intuitive, and non -contact, because of the infrastructure technology, it has now become one of the main research directions in the field of non -destructive testing. [0003] At present, the main research method of infrared non -destructive detection is the difference in thermal conductivity of material defects and normal areas. On the basis of collecting the thermal diagram of the pre -heating test parts, it is based on the distribution characteristics of the temperature field and combined with image processing...
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IPC IPC(8): G01N21/88
Inventor 周建民李鹏胡林海刘正平杨君万琪
Owner EAST CHINA JIAOTONG UNIVERSITY