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Development of 3D Microwave Imaging Technology for Damage Assessment of Concrete Bridge. Final Report.
| 题名： | Development of 3D Microwave Imaging Technology for Damage Assessment of Concrete Bridge. Final Report. |
| 作者： | Feng-M.Q.; DeFlaviis-F.; Kim-Y.; Ko-H.; Liu-S. |
| 关键词： | *Concrete-bridges; *Microwave-equipment; *Image-processing; *Damage-assessment.;Bridges-Structures; Electronic-equipment; Detection-; Visualization-; Antenna-arrays; Technology-innovation; Nondestructive-evaluation. |
| 摘要： | An innovative microwave 3-dimensional (3D) sub-surface imaging technology is developed for detecting and quantitatively assessing internal damage of concrete structures. This technology is based on reconstruction of dielectric profile (image) of a structure illuminated with microwaves sent and received by antenna arrays. In this project, it is found that focused microwave is much more effective than the unfocused ones in detecting small defects, and thus a unique numerical bi-focusing technique is developed to focus both the transmitting and the receiving microwave signals. A multi-frequency technique is applied to improve the image clarity by reducing the background noises. Two software packages have been developed in this study: one for 3Dimage reconstruction and the other for image visualization. Two engineering prototypes have been fabricated: one consists of arrays of 128 antennas and the other 256 antennas with sophisticated electronic switching controlled by software. The first prototype system is tested on concrete blocks, in which voids and steel bars are successfully detected. It was experimentally demonstrated that bi-focusing operator can double the image resolution. |
| 报告类型： | 科技报告 |
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