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Recent developments in guided wave travel time tomography

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Author: Zon, A.T. van · Volker, A.W.F.
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, 201-208
Identifier: 513409
ISBN: 9780735412118
Keywords: Physics · Corrosion Monitoring · Dispersion · Inversion · Guided electromagnetic wave propagation · Nondestructive examination · Sensors · Ultrasonic testing · Guided wave tomographies · Periodic inspection · Predictive maintenance · Sizing accuracy · Transducer rings · Travel time tomography · Industrial Innovation · Fluid Mechanics Chemistry & Energetics · PID - Process & Instrument Development · TS - Technical Sciences

Abstract

The concept of predictive maintenance using permanent sensors that monitor the integrity of an installation is an interesting addition to the current method of periodic inspections. Guided wave tomography had been developed to create a map of the wall thickness using the travel times of guided waves. It can be used for both monitoring and for inspection of pipe-segments that are difficult to access, for instance at the location of pipe-supports. An important outcome of the tomography is the minimum remaining wall thickness, as this is critical in the scheduling of a replacement of the pipe-segment. In order to improve the sizing accuracy we have improved the tomography scheme. A number of major improvements have been realized allowing to extend the application envelope to pipes with a larger wall thickness and to larger distances between the transducer rings. Simulation results indicate that the sizing accuracy has improved and that is now possible to have a spacing of 8 meter between the source-ring and the receiver-ring. Additionally a reduction of the number of sensors required might be possible as well. © 2014 AIP Publishing LLC.