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The Efficiency of External Heat Sources for Infrared Thermography Applied Concrete Structures and the Improvement of the Defect-identification

열화상 기법을 이용한 콘크리트 구조물 결함 검출시 열원의 효율 비교 및 결함검출 능력 향상

  • 심준기 (고려대학교 건축.사회환경공학과) ;
  • 문도영 (고려대학교 건축.사회환경공학과) ;
  • 정란 (단국대학교 건축공학과) ;
  • 이종세 (한양대학교 건설환경시스템공학과) ;
  • 지광습 (고려대학교 건축.사회환경공학과)
  • Received : 2009.06.08
  • Accepted : 2009.08.17
  • Published : 2009.09.30

Abstract

The purpose of this paper is to find an efficient heat source to amplify the surface temperature of damaged concrete structures for infrared thermography. we compare two different heat sources of far-infrared lamp and halogen lamp each other for their efficiency. The two heat sources were applied to the concrete specimens. Two different concrete specimens were used: one was the concrete containing internal void and the other was wrapped with partially unbonded fiber reinforced polymer sheet. it was found that the far-infrared lamp was more efficient than the halogen lamp. In addition, we propose a new algorithm to make the damage zone displayed clear in the image obtained from the thermographic operation. The algorithm is a combination of Gauss filtering process and the Prewitt mask operation.

본 논문의 목적은 열화상 비파괴 검사기법을 적용시 손상된 콘크리트 구조물의 표면온도를 증폭시키기 위해 사용되는 외부 열원의 효율성을 알아보기 위함이다. 원적외선램프와 할로겐램프의 적용성과 효율성을 서로 비교하였다. 이를 위해 전술한 두 개의 열원을 콘크리트의 내부공극과 FRP쉬트의 비부착 결함 시험체에 적용하였다. 본 연구결과, 원적외선램프가 할로겐램프보다 더 효율적인 것으로 파악되었다. 또한, 손상영역을 효과적으로 검출하기위해서 가우스 필터와 프리윗 마스크 화상처리기법을 혼합한 알고리즘을 제안하였다.

Keywords

References

  1. 지광습, "레이더와 열화상 카메라를 이용한 콘크리트 비파괴 검사 시스템 개발", 교량검사로봇개발사업단 최종 연구보고서(2009)
  2. 심준기, 지광습, 박진형, 조효남, 이종세, "토목 구조물의 손상 검출을 위한 적외선 열화상 기법의 적용 사례 분석", 한국구조물진단학회 논문집, 제12권 3호, 2008, pp.71-83
  3. Stanley C. C. and Balendran R. V., "Developments in Assessing the Structural Integrity of Applied Surfaces to Concrete Buildings", Structural Survey, Vol. 12, No.4, 1994, pp.4-9 https://doi.org/10.1108/02630809410072972
  4. Gailius A. and Zukauskas D., "Determination ofConcrete Structural Defects by Infrared Spectrum Analysis", ISSN 1392-1320 Materials Science (Medziagotyra), Vol. 9, No.1 2003, pp.106-110
  5. Clark M. R., McCann D. M. and Forde M. C., "Application of infrared thermography to the non-destructive testing of concrete and masonry bridges", NDT & E International, Vol. 36, No.4, June 2003, pp.265-275 https://doi.org/10.1016/S0963-8695(02)00060-9
  6. Starnes M. A. and Carino N. J., "Active infrared thermography for NDT of concrete structures strengthened with fiber reinforced polymer", Materials Evaluation, Vol.63, No.1, January 2005, pp.56-63
  7. Brown J. R. and Hamilton III, "NDE of Reinforced Concrete Strengthened with Fiber-Reinforced Polymer Composite using Infrared Thermography", nfraMation the thermographer's conference 2003
  8. Raman M. and Sohal J. S., "Performance Evaluation of Prewitt Edge Detector for Noisy Images", GVI0P Journal, Vol. 6, 2006, pp. 39-46
  9. Brown J. R. and Hamilton H. R., "Heating Method and Detection Limits for infrared Thermography Inspection of Fiber-Reinforced Polymer Composites", Vol. 104, No.5, September-October 2007, pp. 481-490
  10. Starnes M. A. and Carino N. J., "Active infrared thermography for NDT of concrete structures strengthened with fiber reinforced polymer", Materials Evaluation, Vol. 63, No.1, January 2005, pp.56-63