Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
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3D Microwave Imaging Technology for Damage Detection of Concrete Structures

콘크리트 구조물의 결함발견을 위한 3차원 초단파 영상처리기법의 개발

  • Kim, Yoo-Jin (University of California at Irvine) ;
  • Kim, Yong-Gon (Department of Safety Engineering, Hankyong National University)
  • 김유진 (캘리포니아 주립대학 어바인 캠퍼스) ;
  • 김용곤 (한경대학교 안전공학과)
  • Published : 2003.12.01
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Abstract

Various nondestructive evaluation (NDE) techniques have been studied to locate steel rebars of dowel, and to detect invisible damage such as voids and cracks inside concrete and debonding between rebars and concrete caused by corrosions and earthquakes. In this study, the aurhors developed 3-dimensional (3D) electromagnetic (EM) imaging technology to detect such damage and to identify exact location of steel rebars of dowel. The authors have developed sub-surface two-dimensional (2D) imaging technique using tomographic antenna array in previous works. In this study, extending the earlier analytical and experimental works on 2D image reconstruction, a 3D microwave imaging system using tomographic antenna array was developed, and multi-frequency technique was applied to improve quality of the reconstructed image and to reduce background noises. This paper presents the analytical expressions of numerical focusing procedures for 3D image reconstruction and numerical simulation to study the resolution of the system and the effectiveness of multi-frequency technique. Also, the design of 4?4 antenna array with switching devices is introduced as a preliminary study for the final design of whole array.

Keywords

References

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