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http://bura.brunel.ac.uk/handle/2438/12780
Title: | A pulsed eddy current system for flaw detection using an encircling coil on a steel pipe |
Authors: | Majidnia, S Rudlin, J Nilavalan, R |
Keywords: | Pulsed eddy current;Non-destructive testing;Defect detection;Finite element method;Encircling coil;Corrosion under insulation |
Issue Date: | 2014 |
Citation: | First International Conference on Welding and Non Destructive Testing (ICWNDT2014), Karaj-Alborz –Iran, (25-26 February 2014) |
Abstract: | Conventional eddy current techniques have been used to a great extent for detection of surface breaking defects in conductive materials. However, detection of sub-surface defects is limited due to skin effect phenomena and material properties. Pulsed Eddy Current (PEC) techniques excite the probe’s driving coil with a repetitive broadband pulse, usually a square wave. The resulting transient current through the coil induces transient eddy currents in the test piece, these pulses consist of a broad frequency spectrum, and the reflected signal contains important depth information. The work in this paper employs COMSOL Multiphysics, the finite element (FE) modelling software, to investigate the behaviour of a new encircling probe design. This work involves modelling of an encircling coil around a steel pipe with high lift-off to simulate insulation. The 3D modelling of the coil wrapped around a steel pipe was employed and surface breaking discontinuities were modelled. The simulation of these scenarios provided essential information about the behaviour of this probe design. |
URI: | http://www.iwnt.com/icwndt2014/welcome.html http://bura.brunel.ac.uk/handle/2438/12780 |
Appears in Collections: | Dept of Electronic and Electrical Engineering Research Papers |
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