Inverse problem in damage detection

Ying Luo; Zhongfang Li

doi:10.1117/12.839227

24 August 2009 Inverse problem in damage detection

Ying Luo, Zhongfang Li

Proceedings Volume 7375, ICEM 2008: International Conference on Experimental Mechanics 2008; 73752Q (2009) https://doi.org/10.1117/12.839227
Event: International Conference on Experimental Mechanics 2008 and Seventh Asian Conference on Experimental Mechanics, 2008, Nanjing, China

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.

Citation Download Citation

Ying Luo and Zhongfang Li "Inverse problem in damage detection", Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 73752Q (24 August 2009); https://doi.org/10.1117/12.839227

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