The capabilities of the pulsed eddy current technique to extract depth related information have been successfully demonstrated for hidden corrosion detection. In the present work, the drive pulse and the transient response are analyzed in terms of the Fourier transform to understand the depth of material penetration with pulsed eddy current. A multifrequency analysis of the transient response that allows information to be selectively chosen from different layers is described. An observation time interval and a sampling rate are the components that define high- and low-frequency resolution of a pulsed eddy current system. An example of 'in-depth slicing' of a multilayer structure is provided. The use of solid state sensors to acquire transient response is discussed. Examples of pulsed eddy current imaging with arrays of giant magneto resistors are given. Recently developed two-dimensional arrays enable instant imaging of the structure under the probe without mechanical scanning. They also provide the fastest surface coverage for large area testing when used with 2D scanners. Experiments have been performed on aircraft aluminum skin with a portable prototype system. The advantages and limitations of the technique are discussed.


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    Title :

    Enhanced corrosion detection in airframe structures using pulsed eddy current and advanced processing


    Additional title:

    Verbesserter Korrosionsnachweis in Flugzeugzellen mittels Impuls-Wirbelstromprüfung und moderner Signalverarbeitung


    Contributors:

    Published in:

    Materials Evaluation ; 65 , 4 ; 403-410


    Publication date :

    2007


    Size :

    8 Seiten, 10 Bilder, 9 Quellen



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English





    Pulsed eddy current method developments for hidden corrosion detection in aircraft structures

    Lepine, B.A. / Wallace, B.P. / Forsyth, D.S. et al. | Tema Archive | 1999


    Advanced Airframe Materials and Structures

    Curtis, P. / Royal Aeronautical Society | British Library Conference Proceedings | 2007


    Quantitative assessment of corrosion in aircraft structures using scanning pulsed eddy current

    Bieber, J.A. / Tai, Cheng-Chi / Moulder, J.C. | Tema Archive | 1998