Optimization of Lock-in Thermography Technique using Phase Image Processing

영상처리에 의한 위상잠금 열화상기법의 최적화 연구

  • Received : 2012.05.21
  • Accepted : 2012.10.25
  • Published : 2012.10.31


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.


Lock-in thermography;Image processing;Multi-way factorial design;Optical intensity;Integration time;Non-destructive test


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