Through-Transmission Impedance Measurements on Moving Metallic Sheets

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1992
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Kahn, Arnold
Mester, Michael
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Review of Progress in Quantitative Nondestructive Evaluation
Center for Nondestructive Evaluation

Begun in 1973, the Review of Progress in Quantitative Nondestructive Evaluation (QNDE) is the premier international NDE meeting designed to provide an interface between research and early engineering through the presentation of current ideas and results focused on facilitating a rapid transfer to engineering development.

This site provides free, public access to papers presented at the annual QNDE conference between 1983 and 1999, and abstracts for papers presented at the conference since 2001.

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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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Wed Jan 01 00:00:00 UTC 1992