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Investigation of the magnetic field response from eddy current inspection of defects

Lookup NU author(s): Anthony Simm, Professor Gui Yun TianORCiD


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Eddy current testing is one of the most widely used methods in non-destructive testing for the inspection of conductive materials. Numerical modelling of eddy current testing has emerged as an important approach alongside experimental studies. This paper investigates an application of numerical modelling and experimental study as a means of the quantitative non-destructive evaluation (QNDE) of defects in conductive samples. There are two methods of measuring eddy current response, more commonly by measuring the change in impedance of the eddy current probe coil, or as used in this work, by measuring the change in magnetic field directly using magnetic field sensors such as superconducting quantum interference devices, giant magneto resistance, or as in this case Hall sensors. Specifically, measurements made using an eddy current probe containing an excitation coil and a Hall sensor, experimentally obtained using an X-Y scanner table, are compared with a numerical (finite element method) model. The discrepancies between the experimental tests and the numerical models have been analysed and explained, which is an important factor in engineering applications of QNDE.

Publication metadata

Author(s): Simm A, Theodoulidis T, Poulakis N, Tian GY

Publication type: Article

Publication status: Published

Journal: International Journal of Advanced Manufacturing Technology

Year: 2011

Volume: 54

Issue: 1-4

Pages: 223-230

Print publication date: 09/09/2010

ISSN (print): 0268-3768

ISSN (electronic): 1433-3015

Publisher: Springer


DOI: 10.1007/s00170-010-2919-5


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Funder referenceFunder name
EP/E010458/1Engineering and Physical Sciences Research Council