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Two approaches to coil impedance calculation of eddy current sensor.

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Title: Two approaches to coil impedance calculation of eddy current sensor.
Authors: Yating, Yu1,2, Pingan, Du1,2
Source: Proceedings of the Institution of Mechanical Engineers -- Part C -- Journal of Mechanical Engineering Science (Professional Engineering Publishing). Mar2008, Vol. 222 Issue 3, p507-515. 9p.
Subjects: Numerical analysis, Eddy current testing, Eddy currents (Electric), Electric impedance, Theory, Electromagnetic fields, Finite element method, Magnetospheric currents, Numerical solutions to integral equations
Abstract: Eddy current (EC) sensor detects measurand by the change of coil impedance, which is introduced by coupling the magnetic energy between coil and measurement target. Therefore, it is of great significance for both the forward and inverse eddy current problems to study on the approaches to coil impedance calculation. In the current paper, two approaches are presented to calculate coil impedance of EC sensor. First, the theoretical calculation model of coil impedance is simplified as an air-cored cylindrical coil, over an infinite measurement target. And the integral expression of coil impedance is derived according to the sensor operation principle and electromagnetic field theory. Then, the integral expression is expanded as series form in cylindrical coordinate system in order to compute the coil impedance easily, and computed using MathematicaTM. Next, based on the finite element modeling theory, two different finite element models of eddy current measurement system are built. The infinite boundary in mode1 is truncated, while in model 2, it is simulated completely by an infinite element. Furthermore, the appropriate location where the air domain is truncated at is determined. Finally, the coil impedance and the magnetic distribution of eddy current testing system are obtained by finite element method, respectively. By comparison, the results from the theoretical calculation approach and finite element method are in very good agreement, and the accuracy of two approaches is validated with each other. [ABSTRACT FROM AUTHOR]
Copyright of Proceedings of the Institution of Mechanical Engineers -- Part C -- Journal of Mechanical Engineering Science (Professional Engineering Publishing) is the property of Professional Engineering Publishing 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.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 31729367
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  Data: Two approaches to coil impedance calculation of eddy current sensor.
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  Data: <searchLink fieldCode="DE" term="%22Numerical+analysis%22">Numerical analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Eddy+current+testing%22">Eddy current testing</searchLink><br /><searchLink fieldCode="DE" term="%22Eddy+currents+%28Electric%29%22">Eddy currents (Electric)</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+impedance%22">Electric impedance</searchLink><br /><searchLink fieldCode="DE" term="%22Theory%22">Theory</searchLink><br /><searchLink fieldCode="DE" term="%22Electromagnetic+fields%22">Electromagnetic fields</searchLink><br /><searchLink fieldCode="DE" term="%22Finite+element+method%22">Finite element method</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetospheric+currents%22">Magnetospheric currents</searchLink><br /><searchLink fieldCode="DE" term="%22Numerical+solutions+to+integral+equations%22">Numerical solutions to integral equations</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: Eddy current (EC) sensor detects measurand by the change of coil impedance, which is introduced by coupling the magnetic energy between coil and measurement target. Therefore, it is of great significance for both the forward and inverse eddy current problems to study on the approaches to coil impedance calculation. In the current paper, two approaches are presented to calculate coil impedance of EC sensor. First, the theoretical calculation model of coil impedance is simplified as an air-cored cylindrical coil, over an infinite measurement target. And the integral expression of coil impedance is derived according to the sensor operation principle and electromagnetic field theory. Then, the integral expression is expanded as series form in cylindrical coordinate system in order to compute the coil impedance easily, and computed using MathematicaTM. Next, based on the finite element modeling theory, two different finite element models of eddy current measurement system are built. The infinite boundary in mode1 is truncated, while in model 2, it is simulated completely by an infinite element. Furthermore, the appropriate location where the air domain is truncated at is determined. Finally, the coil impedance and the magnetic distribution of eddy current testing system are obtained by finite element method, respectively. By comparison, the results from the theoretical calculation approach and finite element method are in very good agreement, and the accuracy of two approaches is validated with each other. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Proceedings of the Institution of Mechanical Engineers -- Part C -- Journal of Mechanical Engineering Science (Professional Engineering Publishing) is the property of Professional Engineering Publishing 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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RecordInfo BibRecord:
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        Value: 10.1243/09544062JMES395
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      – Code: eng
        Text: English
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        PageCount: 9
        StartPage: 507
    Subjects:
      – SubjectFull: Numerical analysis
        Type: general
      – SubjectFull: Eddy current testing
        Type: general
      – SubjectFull: Eddy currents (Electric)
        Type: general
      – SubjectFull: Electric impedance
        Type: general
      – SubjectFull: Theory
        Type: general
      – SubjectFull: Electromagnetic fields
        Type: general
      – SubjectFull: Finite element method
        Type: general
      – SubjectFull: Magnetospheric currents
        Type: general
      – SubjectFull: Numerical solutions to integral equations
        Type: general
    Titles:
      – TitleFull: Two approaches to coil impedance calculation of eddy current sensor.
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            NameFull: Yating, Yu
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            NameFull: Pingan, Du
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            – D: 01
              M: 03
              Text: Mar2008
              Type: published
              Y: 2008
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            – TitleFull: Proceedings of the Institution of Mechanical Engineers -- Part C -- Journal of Mechanical Engineering Science (Professional Engineering Publishing)
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