The potential uses for time reversal focusing of guided waves in pipes are numerous. Time reversal's ability to compensate for multiple modes and dispersion allow for the coherent transmission of waves between transducers. This allows investigators greater discretion when choosing a signal of excitation to achieve the greatest propagation distance and largest signal-to-noise ratios. Focused signals also present a distinguishable peak that can be used to better characterize a medium. For example, that peak is used as a metric for the presence of damage when performing a time reversal change focusing experiment. Based on the analysis above, some important conclusions are obtained as follow: (1) Using the time reversal method for the guided wave inspection of a pipe can realize energy focusing on a defect in the pipe; (2) the reflection coefficient increases with widening the intercepting window when the time reversal method is used to enhance the inspection ability of guided waves; (3) numerical results for the method presented here will guide the experiment in the future; (4) time reversal also has much potential for nondestructive testing and structural health monitoring (SHM) applications in other physical infrastructures as well as pipes.
Defect detection in pipelines using time reversal of PZT-based guided waves
2013
6 Seiten, 8 Bilder, 11 Quellen
Conference paper
Storage medium
English
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