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Research on spectral response of pulsed eddy current and NDE applications

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

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Abstract

Using pulsed excitation, pulsed eddy current (PEC) technique generates responses over a wide range of frequencies, containing more information than traditional eddy current inspection in the frequency domain. This paper investigates the spectral response of PEC under varying probe lift-off, material properties (electrical conductivity and magnetic permeability) and directional tensile stress. It is shown that material properties and lift-off exhibit different spectra patterns. Using normalisation in frequency domain, the lift-off effect can be reduced. Spectra for both electrical conductivity and magnetic permeability show a complex pattern. Tensile stress measurement in aluminium 2024 and 5083 is investigated, which show similar spectra pattern to electrical conductivity variation. Applications for corrosion characterisation, displacement measurement and profile inspection can be developed in the future in conjunction with time-domain features. (C) 2012 Elsevier B.V. All rights reserved.

Publication metadata

Author(s): Tian GY, He YZ, Adewale I, Simm A

Publication type: Article

Publication status: Published

Journal: Sensors and Actuators A: Physical

Year: 2013

Volume: 189

Pages: 313-320

Print publication date: 15/01/2013

ISSN (print): 0924-4247

ISSN (electronic): 1873-3069

Publisher: Elsevier SA

URL: http://dx.doi.org/10.1016/j.sna.2012.10.011

DOI: 10.1016/j.sna.2012.10.011

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