Guided Wave Technique for Corrosion Detection in Reinforced Steel Bars

Guided wave techniques are very promising for damage detection in pipe and plate like structures. Longitudinal guided waves are excited and recorded after transmission for corrosion detection in reinforcing steel bars. Apart from recording the amplitude of the transmitted guided waves or in other words, monitoring the attenuation of guided waves, differential timeof- flight is recorded with high temporal resolution using cross-correlation technique. It is found that corrosion can be detected from the TOF change as well. Feature extraction techniques are used from time-frequency representations.

References
1. Miller, T.H., T. Kundu, J. Huang and J.Y. Grill, “A new guided wave-based technique for corrosion monitoring in reinforced concrete,” Structural Health Monitoring: An International Journal, Vol. 12(1) pp. 35-47 (2013). 2. Amjad, U., D. Jha, K.S. Tarar, H. Klinghammer and W. Grill, “Determination of the stress dependence of the velocity of Lamb waves in aluminum plates,” Proceedings of SPIE, Vol. 7984, 798410 (2011). 3. Tarar, K.S., R. Meier, E. Twerdowski, R. Wannemacher and W. Grill, “A differential method for the determination of the time-of-flight for ultrasound under pulsed wide band excitation including chirped signals,” Proceedings of SPIE, Vol. 6935, 693519 (2008). 4. Stockwell, R.G., L. Mansinha, and R.P. Lowe, “Localization of the complex spectrum: The S transform,” IEEE Transactions on Signal Processing, 44:998–1001 (1996.)
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