Improved synthetic aperture focusing technique by Hilbert-Huang transform for imaging defects inside a concrete structure

Jian Hua Tong, Chin Lung Chiu, Chung Yue Wang

研究成果: 雜誌貢獻期刊論文同行評審

20 引文 斯高帕斯(Scopus)

摘要

A useful nondestructive testing tool for civil engineering should immediately reveal defects inside concrete structures at the construction sites. To date, there are few effective methods to image defects inside concrete structures. In this paper, a new nondestructive testing method using elastic waves for imaging possible defects inside concrete is developed. This method integrates the point-source/point receiver scheme with the synthetic aperture focusing technique (SAFT) to increase functioning depth and enhance received signals. To improve image quality, received signals are processed by Hilbert- Huang transform (HHT) to get time-frequency curves for the SAFT process. Compared with conventional SAFT method processing with time-amplitude signals, this new method is capable of providing a better image of defects not only in the numerical simulation but also in the experimental result. The image can reveal the number of defects and their locations and front-end profiles. The results shown in this paper indicate that this new elastic-wave-based method exhibits high capability in imaging the defects of in situ concrete structures.

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文章編號5611698
頁(從 - 到)2512-2521
頁數10
期刊IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
57
發行號11
DOIs
出版狀態已出版 - 11月 2010

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