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1-D profiling using highly dispersive guided waves

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Author: Volker, A.W.F. · Zon, A.T. van
Type:article
Date:2014
Publisher: American Institute of Physics
Source:40th Annual Review of Progress in Quantitative Nondestructive Evaluation, QNDE 2013, Incorporating the 10th International Conference on Barkhausen and Micro-Magnetics, ICBM 2013, 21-26 July 2013, Baltimore, MD, USA, 1581 33, 186-192
Identifier: 513314
ISBN: 9780735412118
Keywords: Physics · Inversion · Wall Thickness Profiling · Corrosion · Defects · Nondestructive examination · Circumferential direction · Dispersion correction · Guided wave tomographies · Integrity levels · Reliability and safeties · Residual dispersions · Guided electromagnetic wave propagation · Industrial Innovation · Fluid Mechanics Chemistry & Energetics · PID - Process & Instrument Development · TS - Technical Sciences

Abstract

Corrosion is one of the industries major issues regarding the integrity of assets. Currently, inspections are conducted at regular intervals to ensure a sufficient integrity level of these assets. Cost reduction while maintaining a high level of reliability and safety of installations is a major challenge. There are many situations where the actual defect location is not accessible, e.g., a pipe support or a partially buried pipe. Guided wave tomography has been developed to reconstruct the wall thickness of steel pipes. In case of bottom of the line corrosion, i.e., a single corrosion pit, a simpler approach may be followed. Data is collected in a pitch-catch configuration at the 12 o'clock position using highly dispersive guided waves. After dispersion correction the data collapses to a short pulse, any residual dispersion indicates wall loss. The phase spectrum is used to invert for the wall thickness profile in the circumferential direction, assuming a Gaussian defect profile. The approach is evaluated on numerically simulated and on measured data. The method is intended for rapid, semi-quantitative screening of pipes.