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Proceedings Paper

Inverse problem in damage detection
Author(s): Ying Luo; Zhongfang Li
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Paper Abstract

This study focuses on a signal processing method of damage detection for concrete beams. On the surface of the concrete beam, two sensors are respectively used to excite/receive stress wave signals and catch the reflection information from the damages inside. In order to improve the signal to noise ratio, wavelet method is adopted to pre-process the raw signals. Afterwards, the pre-processed signals are interpreted by a prestack migration technique, which is the reverse problem of the wave propagation, and lead to the profile image of the concrete beam. Results show that with the help of wavelet de-noising method, the prestack migration method can display the locations and dimensions of the damages very well. It is also shown that the present method is more suitable for the incline damage than the horizontal stacking method. Moreover, by comparing the results with different sensor intervals, we analyzed the relatives between the sensor intervals and the resolutions of the profile imaging.

Paper Details

Date Published: 24 August 2009
PDF: 6 pages
Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 73752Q (24 August 2009); doi: 10.1117/12.839227
Show Author Affiliations
Ying Luo, Jiangsu Univ. (China)
Zhongfang Li, Jiangsu Univ. (China)

Published in SPIE Proceedings Vol. 7375:
ICEM 2008: International Conference on Experimental Mechanics 2008
Xiaoyuan He; Huimin Xie; YiLan Kang, Editor(s)

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