Ultrasonic guided wave focusing techniques in steel pipe are used to detect and measure the axial as well as circumferential locations of three differently shaped defects (planar saw cuts, a volumetric through-wall hole, and a volumetric elliptical corrosion). The axial location of a defect was obtained by measuring the arrival time of the defect echo. Defect circumferential location was determined by focusing at 44 circumferential positions around the pipe at a specific distance. The maximum amplitude of the defect echo was recorded with respect to each circumferential focal position in producing an angular profile of the reflected wave. The maximum amplitude of this experimental angular profile occurs at the angle of the defect circumferential location. The energy impingement onto the defect for each focusing position can be calculated from the focused angular profile and the defect cross sectional area. Comparison between the experimental angular profiles and the theoretical ones provides us with a good estimate of the defect circumferential size.
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ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference
July 23–27, 2006
Vancouver, BC, Canada
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
0-7918-4756-X
PROCEEDINGS PAPER
Long Range Ultrasonic Guided Wave Focusing in Pipe for Small Defect Detection, Location and Circumferential Length Analysis
Jing Mu,
Jing Mu
Pennsylvania State University, University Park, PA
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Li Zhang,
Li Zhang
Pennsylvania State University, University Park, PA
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Joseph L. Rose,
Joseph L. Rose
Pennsylvania State University, University Park, PA
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Jack Spanner
Jack Spanner
EPRI NDE Center, Charlotte, NC
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Jing Mu
Pennsylvania State University, University Park, PA
Li Zhang
Pennsylvania State University, University Park, PA
Joseph L. Rose
Pennsylvania State University, University Park, PA
Jack Spanner
EPRI NDE Center, Charlotte, NC
Paper No:
PVP2006-ICPVT-11-93828, pp. 399-404; 6 pages
Published Online:
July 23, 2008
Citation
Mu, J, Zhang, L, Rose, JL, & Spanner, J. "Long Range Ultrasonic Guided Wave Focusing in Pipe for Small Defect Detection, Location and Circumferential Length Analysis." Proceedings of the ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. Volume 5: High Pressure Technology, Nondestructive Evaluation, Pipeline Systems, Student Paper Competition. Vancouver, BC, Canada. July 23–27, 2006. pp. 399-404. ASME. https://doi.org/10.1115/PVP2006-ICPVT-11-93828
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