Noncontact measurement of the exit temperature of sheet metal in an operating rolling mill

Stephen R. Schaps; George Alers; Arnold Kahn; Louis C. Phillips

doi:10.1117/12.259197

15 November 1996 Noncontact measurement of the exit temperature of sheet metal in an operating rolling mill

Stephen R. Schaps, George Alers, Arnold Kahn, Louis C. Phillips

Proceedings Volume 2948, Nondestructive Evaluation for Process Control in Manufacturing; (1996) https://doi.org/10.1117/12.259197
Event: Nondestructive Evaluation Techniques for Aging Infrastructure and Manufacturing, 1996, Scottsdale, AZ, United States

Abstract

In order to monitor the temperature at the exit end of a hot rolling mill, the Aluminum Association and NIST entered into a Cooperative Research and Development Agreement to use the sheet itself as the basic element of a resistance thermometer. The non-contacting requirement can be satisfied by using eddy current techniques, and the temperature can be deduced from the basic relationship between electrical resistivity and temperature. To convert the measured resistivity to temperature, the temperature dependence of the resistivity of pure aluminum is obtained from laboratory calibration measurements and a temperature independent contribution characteristics of the alloy being produced. The latter is determined from the nominal alloy composition or by making a direct measurement of the resistivity and the temperature at an upstream location when the particular alloy being processed is temporarily held stationary for a contact thermocouple measurement of its temperature. The results of on-line measurements with the eddy current noncontacting thermometer in an operating rolling mill are discussed. These measurements consist of data taken from an entry eddy probe, a contact thermometer, a precise resistivity meter, an exit eddy probe, and a thickness gauge. The entry eddy probe was designed, built, and calibrated by the NIST.

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Stephen R. Schaps, George Alers, Arnold Kahn, and Louis C. Phillips "Noncontact measurement of the exit temperature of sheet metal in an operating rolling mill", Proc. SPIE 2948, Nondestructive Evaluation for Process Control in Manufacturing, (15 November 1996); https://doi.org/10.1117/12.259197

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KEYWORDS

Temperature metrology

Aluminum

Calibration

Metals

Sensors

Inductance

Resistance

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