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Medium change based image estimation from application of inverse algorithms to coda wave measurements
Author(s): Hanyu Zhan; Hanwan Jiang; Ruinian Jiang
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Paper Abstract

Perturbations worked as extra scatters will cause coda waveform distortions; thus, coda wave with long propagation time and traveling path are sensitive to micro-defects in strongly heterogeneous media such as concretes. In this paper, we conduct varied external loads on a life-size concrete slab which contains multiple existing micro-cracks, and a couple of sources and receivers are installed to collect coda wave signals. The waveform decorrelation coefficients (DC) at different loads are calculated for all available source-receiver pair measurements. Then inversions of the DC results are applied to estimate the associated distribution density values in three-dimensional regions through kernel sensitivity model and least-square algorithms, which leads to the images indicating the micro-cracks positions. This work provides an efficiently non-destructive approach to detect internal defects and damages of large-size concrete structures.

Paper Details

Date Published: 27 March 2018
PDF: 6 pages
Proc. SPIE 10599, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XII, 1059908 (27 March 2018); doi: 10.1117/12.2295764
Show Author Affiliations
Hanyu Zhan, New Mexico State Univ. (United States)
Hanwan Jiang, Ministry of Transport (China)
Univ. of Wisconsin-Platteville (United States)
Ruinian Jiang, New Mexico State Univ. (United States)


Published in SPIE Proceedings Vol. 10599:
Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XII
Peter J. Shull, Editor(s)

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