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Through-Transmission Impedance Measurements on Moving Metallic Sheets

  • Chapter
Review of Progress in Quantitative Nondestructive Evaluation

Part of the book series: Advances in Cryogenic Engineering ((RPQN,volume 28))

Abstract

Eddy current measurement of electrical resistivity provides a method of sensing temperature during metals processing, thus offering a method of feedback control [1,2]. This method assumes a known resistivity-temperature relation for the alloy being processed. However, in many common processing configurations a measurement of the impedance of the coil system can depend on the velocity of the product being tested. In the through-transmission (abbreviated thru-trans) configuration for monitoring moving metallic sheets, the component of the exciting magnetic field normal to the sheet induces an electric field in the sheet transverse to the direction of the velocity. This modifies the induced current distribution and thus changes the shielding of the field at the receiver coil relative to the condition for the static case. This effect is significant even in the case of extruded aluminum moving at 150 ft/min. In high speed rolling, at 1000 ft/min or greater, the effect of velocity is even more significant.

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References

  1. M.L. Mester, A.H. Kahn, and H.N.G. Wadley, Extrusion Technology 1988,The Aluminum Association, Washington DC, (1988). See p. 259 et seq.

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Author information

Authors and Affiliations

  1. National Institute of Standards and Technology, Gaithersburg, MD, 20899, USA

    Arnold H. Kahn

  2. Babcock and Wilcox, Cleveland, OH, 44685-0190, USA

    Michael L. Mester

Authors
  1. Arnold H. Kahn
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  2. Michael L. Mester
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Editor information

Editors and Affiliations

  1. Center for NDE Ames Laboratory (USDOE) and Department of Aerospace Engineering and Engineering Mechanics, Iowa State University, Ames, Iowa, USA

    Donald O. Thompson

  2. Center for NDE and Department of Materials Science and Engineering, The Johns Hopkins University, Baltimore, Maryland, USA

    Dale E. Chimenti

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© 1992 Springer Science+Business Media New York

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Kahn, A.H., Mester, M.L. (1992). Through-Transmission Impedance Measurements on Moving Metallic Sheets. In: Thompson, D.O., Chimenti, D.E. (eds) Review of Progress in Quantitative Nondestructive Evaluation. Advances in Cryogenic Engineering, vol 28. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-3344-3_31

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  • DOI: https://doi.org/10.1007/978-1-4615-3344-3_31

  • Publisher Name: Springer, Boston, MA

  • Print ISBN: 978-1-4613-6474-0

  • Online ISBN: 978-1-4615-3344-3

  • eBook Packages: Springer Book Archive

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