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    题名: Improved Synthetic Aperture Focusing Technique by Hilbert-Huang Transform for Imaging Defects Inside a Concrete Structure
    作者: Tong,JH;Chiu,CL;Wang,CY
    贡献者: 土木工程學系
    关键词: TRANSIENT ELASTIC-WAVES;EMPIRICAL MODE DECOMPOSITION;FLAW DETECTION;IMPACT-ECHO;CONSTANTS;SYSTEM;CRACKS
    日期: 2010
    上传时间: 2012-03-27 16:16:59 (UTC+8)
    出版者: 國立中央大學
    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.
    關聯: IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
    显示于类别:[土木工程學系 ] 期刊論文

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