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Optimization of Lock-in Thermography Technique using Phase Image Processing
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 Title & Authors
Optimization of Lock-in Thermography Technique using Phase Image Processing
Cho, Yong-Jin; Han, Song-I;
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 Abstract
This study examined the use of LIT (lock-in infrared thermography) to detect defects in the welded parts of ships and offshore structures. A quantitative analysis was used with the filtering and texture measurement of image processing techniques to find the optimized experimental condition. We verified the reliability of our methods by applying image processing techniques in order to normalize the evaluations of comparative images that showed a phase difference. In addition, it was found that a low to mid-range intensity of light exposure on the surface showed good results, whereas high exposure did not provide significant results. A lock-in frequency of around 0.1 Hz was satisfactory regardless of the intensity of the light source. In addition, making the integration time of the thermography camera inversely proportional to the intensity of the exposed light source during the experiment provided good results.
 Keywords
Lock-in thermography;Image processing;Multi-way factorial design;Optical intensity;Integration time;Non-destructive test;
 Language
Korean
 Cited by
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비파괴검사학회지, 2015. vol.35. 3, pp.200-205 crossref(new window)
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능동 적외선열화상 기법을 이용한 이면결함 검출에서의 측정 불확도,정윤재;김원태;최원재;

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Measurement Uncertainty on Subsurface Defects Detection Using Active Infrared Thermographic Technique, Journal of the Korean Society for Nondestructive Testing, 2015, 35, 5, 341  crossref(new windwow)
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Internal Defect Position Analysis of a Multi-Layer Chip Using Lock-in Infrared Microscopy, Journal of the Korean Society for Nondestructive Testing, 2015, 35, 3, 200  crossref(new windwow)
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