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Proceedings Paper

Microwave sub-surface imaging of damage in concrete structures
Author(s): Yoo Jin Kim; Luis Jofre; Franco De Flaviis; Maria Qing Feng
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Paper Abstract

It has been well demonstrated that the structural performance of reinforced concrete (RC) columns can be enhanced by retrofitting using fiber reinforced polymer (FRP) composite jackets. Therefore, an increasingly large number of bridges and building columns have been retrofitted with such jackets. The authors developed a microwave imaging technology for detecting such damage as voids and debonding between the jacket and the column, which may significantly weaken the structural performance of the column. The authors developed surface imaging technology using focused microwave in previous works. In this paper, extending the earlier analytical and experimental works, a microwave sub-surface imaging system using antenna array was developed and verified for its capabilities to assess the damage of concrete structures. The proposed imaging system uses an arrangement consisting of several cylindrical or planar arrayed antennas for transmitting and receiving signals, and a numerical focusing operator is applied to the external signals both in transmitting and in receiving fields. This paper describes a numerical focusing procedure and numerical simulations demonstrated that the sub-surface image can be successfully reconstructed by using the proposed sub-surface imaging technology. For the experimental verification, the prototype of planar antenna array was fabricated and tested on the concrete block, in which the artificial voids were inserted.

Paper Details

Date Published: 28 June 2002
PDF: 12 pages
Proc. SPIE 4696, Smart Structures and Materials 2002: Smart Systems for Bridges, Structures, and Highways, (28 June 2002); doi: 10.1117/12.472569
Show Author Affiliations
Yoo Jin Kim, Univ. of California/Irvine (United States)
Luis Jofre, Univ. Politecnica de Catalunya (Spain)
Franco De Flaviis, Univ. of California/Irvine (United States)
Maria Qing Feng, Univ. of California/Irvine (United States)

Published in SPIE Proceedings Vol. 4696:
Smart Structures and Materials 2002: Smart Systems for Bridges, Structures, and Highways
S.-C. Liu; Darryll J. Pines, Editor(s)

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