MsS Guided Wave Probe and Coupling Approach for Reliable Long-Term Structural Health Monitoring (SHM) of Pipeline

Because of its ability to examine a long length of pipeline from a single position, the guided wave inspection technique is the best candidate for long-term structural health m onitoring (SHM) of lines that are difficult to access, such as buried or cased pipelines. This involves permanent installation of guided wave probes on the line, establishing baseline data, periodically collecting data on-line, and tracking any condition changes by comparing the baseline and periodically collected data. To accurately track the condition changes, the long-term (over tens of years) stability and reliability of the installed probe are essential, particularly when the access to the installed probe requires costly preparation such as excavation. In this presentation, a highly reliable, corrosion proof, magnetostrictive sensor (MsS) probe called MsT that was developed for long-term SHM applications are described together with a reliable coupling approach that, if degraded under operating environmental conditions of pipelines, can be restored remotely.

References
1. Kwun, H. and C. Dynes, “Long-range Guided Wave Inspection of Pipe Using the Magnetostrictive Sensor Technology – Feasibility of Defect Characterization,” Nondestructive Evaluation of Utilities and Pipelines II, International Society for Optical Engineering, SPIE, Vol. 3400, 1998, pp. 326-337. 2. Kwun, H. and G.M. Light. “Magnetostrictive Sensor Technology Proven in Process Applications,” Oil and Gas Journal, Vol. 98.21, 2000. 3 Vinogradov, S., “Magnetostrictive Transducer for Torsional Mode Guided Wave in Pipes and Plates,” Materials Evaluation, Vol. 67, N 3, 2009, pp. 333–341. 4. Vinogradov, S., “Method and System for Generating and Receiving Torsional Guided Waves in a Structure,” U.S. Patent 7,821,258, October 26, 2010. 5. Vinogradov, Sergey, Hegeon Kwun, Glenn Light and Darryl Wagar, “Applications of MsT Probes for Guided Wave Testing of Components,” Presented at the ASNT Spring 2012 Conference, Dallas, TX, 19-23 March 2012.
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