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Separation of Lift-off and Defect Depth Features in Magnetic Sensor based Pulsed Eddy Current Signals

Lookup NU author(s): Ibukun Adewale, Professor Gui Yun TianORCiD


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© 2015 The authors and IOS Press. All rights reserved. This paper focuses on defect characterisation independent of the lift-off effects using lift-off point of intersection (LOI) and the separation of these two parameters in pulsed eddy current (PEC) measurements for ferrous and nonferrous materials. It reveals, amongst other things, that the first order derivative of the normalised PEC response maintains the LOI feature, which otherwise is not apparent in ferromagnetic materials using current methods; lift-off effects in ferrous materials vary strongly with the second order derivative of the normalised PEC response and the LOI can be used for defect estimation in a magnetic sensor-based PEC. These two characteristics provide a means of separating lift-off effects from the defect.

Publication metadata

Author(s): Adewale ID, Tian GY, Dong SH, Ting GX, Zeng Y, Liu G

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: 19th International Workshop on Electromagnetic Non-Destructive Evaluation (ENDE)

Year of Conference: 2015

Pages: 211-221

Acceptance date: 01/01/1900

Publisher: IOS Press


DOI: 10.3233/978-1-61499-509-8-211

Library holdings: Search Newcastle University Library for this item

Series Title: Studies in Applied Electromagnetics and Mechanics

ISBN: 9781614995081