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Fast Methods for Quantitative Eddy-Current Tomography of Conductive Materials.

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Title: Fast Methods for Quantitative Eddy-Current Tomography of Conductive Materials.
Authors: Tamburrino, Antonello1,2 tamburrino@unicas.it, Rubinacci, Guglielmo3
Source: IEEE Transactions on Magnetics. Aug2006, Vol. 42 Issue 8, p2017-2028. 12p. 3 Charts, 11 Graphs.
Subjects: Imaging systems, Electromagnetism, Eddy currents (Electric), Finite element method, Electrical conductors, Matrices (Mathematics), Electric resistance
Abstract: In this paper, we address the imaging of the spatial distribution of the resistivity of conductive materials by using data from eddy-current nondestructive testing. Specifically, the data consists of measurements of the impedance matrix at several frequencies acquired using a coil array. The imaging method processes the second-order term (estimated from the measured data) of the power series expansion, with respect to frequency, of the impedance matrix. This term accounts for the resistive contribution to changes of the impedance matrix, due to the presence of anomalies in the conductor under test, occurring at relatively low frequencies. The operator mapping a given resistivity distribution inside the conductor into the second-order term satisfies a proper monotonicity property. The monotonicity makes it possible to apply a fast noniterative imaging method initially developed by the authors for elliptic problems such as electrical resistance tomography. Numerical examples show the main features of the proposed method, and demonstrate the possibility of real-time imaging. [ABSTRACT FROM AUTHOR]
Copyright of IEEE Transactions on Magnetics is the property of IEEE and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: <searchLink fieldCode="JN" term="%22IEEE+Transactions+on+Magnetics%22">IEEE Transactions on Magnetics</searchLink>. Aug2006, Vol. 42 Issue 8, p2017-2028. 12p. 3 Charts, 11 Graphs.
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  Data: <searchLink fieldCode="DE" term="%22Imaging+systems%22">Imaging systems</searchLink><br /><searchLink fieldCode="DE" term="%22Electromagnetism%22">Electromagnetism</searchLink><br /><searchLink fieldCode="DE" term="%22Eddy+currents+%28Electric%29%22">Eddy currents (Electric)</searchLink><br /><searchLink fieldCode="DE" term="%22Finite+element+method%22">Finite element method</searchLink><br /><searchLink fieldCode="DE" term="%22Electrical+conductors%22">Electrical conductors</searchLink><br /><searchLink fieldCode="DE" term="%22Matrices+%28Mathematics%29%22">Matrices (Mathematics)</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+resistance%22">Electric resistance</searchLink>
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  Data: In this paper, we address the imaging of the spatial distribution of the resistivity of conductive materials by using data from eddy-current nondestructive testing. Specifically, the data consists of measurements of the impedance matrix at several frequencies acquired using a coil array. The imaging method processes the second-order term (estimated from the measured data) of the power series expansion, with respect to frequency, of the impedance matrix. This term accounts for the resistive contribution to changes of the impedance matrix, due to the presence of anomalies in the conductor under test, occurring at relatively low frequencies. The operator mapping a given resistivity distribution inside the conductor into the second-order term satisfies a proper monotonicity property. The monotonicity makes it possible to apply a fast noniterative imaging method initially developed by the authors for elliptic problems such as electrical resistance tomography. Numerical examples show the main features of the proposed method, and demonstrate the possibility of real-time imaging. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of IEEE Transactions on Magnetics is the property of IEEE and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1109/TMAG.2006.877542
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      – Code: eng
        Text: English
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        PageCount: 12
        StartPage: 2017
    Subjects:
      – SubjectFull: Imaging systems
        Type: general
      – SubjectFull: Electromagnetism
        Type: general
      – SubjectFull: Eddy currents (Electric)
        Type: general
      – SubjectFull: Finite element method
        Type: general
      – SubjectFull: Electrical conductors
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      – SubjectFull: Matrices (Mathematics)
        Type: general
      – SubjectFull: Electric resistance
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      – TitleFull: Fast Methods for Quantitative Eddy-Current Tomography of Conductive Materials.
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              M: 08
              Text: Aug2006
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