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J. Ocean Eng. Technol. 2006;20(2):8-15.    

Guided-Waves-Based Mortar-Filled Steel Pipe Inspection Using EMAT End Wavelet Transform
Na Won-Bae;Kim Jeong-Tae;Ryu Yeon-Sun;
Department of Ocean Engineering, Pukyong National University;Department of Ocean Engineering, Pukyong National University;Department of Ocean Engineering, Pukyong National University;
© 2006 The Korean Society of Ocean Engineers     Open access / Under a Creative Commons License
Keywords: Guided-waves-based, Mortar-filled steel pipe, Electro magnetic acoustic transduce (EMAT), Wavelet Transform
Abstract
Guided-waves-based mortar-filled steel pipe inspection is carried out through using EMAT (Electro magnetic acoustic transducer) and wavelet transform. Possibly existing anomalies such as separation (or void) and inclusion are made in the fabricated mortar-fled steel pipes: these anomalies are infected. Since guided waves have the long range inspection capability, EMAT has its own advantages over the conventional PZT (Piezoelectric zirconate titanate), and wavelet transform gives the multi-resolution on time-frequency domain results, the suggested technique gives an alternative way for inspecting mortar-filled steel pipes, which are popularly used for supporting marine structures such as piers, wharfs, moles, and dolphins. Through this study, it is show that the suggested technique is promising for detecting the amounts of separations and inclusions.
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