- Conference date: 26–31 July 2009
- Location: Kingston (Rhode Island)
In the past, inspection by ultrasonic guided waves (also called ‘Long Range Ultrasonic Testing’, or LRUT) has been used as a tool for rapidly screening pipeline for the presence of corrosion, where a loss to the original cross sectional area of greater than around 9% can be detected, and located with an axial resolution of a few inches. Recent advances have shown that this qualitative screening method has the potential to be transformed into a more quantitative NDT technique. This is achieved by using a phased‐array technique to focus guided waves at areas of interest identified by an initial screening test, and allows the ability of estimating the circumferential extent and position of localized defects. It is possible to sequentially focus the guided waves at incremental positions along the length of the pipe as well as around the circumference, but the inspection time increases with the number of required focus positions. To address this practical limitation, the present work investigates techniques to greatly reduce the inspection duration. Full Matrix Capture and broadband excitation approaches are discussed and initial results are presented, illustrating the feasibility of such methods.
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