21 March 1989 On-Line Temperature Measurement In Hot Rolling Of Aluminum Using Infrared Imaging Systems
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Abstract
In this paper we report our experience using infrared imaging systems to monitor temperature variations in aluminum strip during hot rolling. Because of the low emissivity of aluminum surfaces infrared cameras are sensitive not only to temperature variations in the strip, but also to changes in surface characteristics caused by changes in alloy and surface roughness. In the system described in this paper, process information from the mill control computer is used to automatically select emissivity factors from a lookup table. A second technique for adjusting emissivity factors, using reference point temperatures measured by a separate sensor will also be described. Results from tests, comparing temperatures measured by infrared imaging systems with contact temperature probes indicate good agreement between the two techniques at later stages in the hot rolling process, when surface emissivity is uniform. Factors affecting the installation of a thermal imaging system on a production line, in particular the location of the camera and integration with other temperature measurement systems, are also discussed.
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M. Fairlie, M. Fairlie, W. Fraser, W. Fraser, B. Farahbakhsh, B. Farahbakhsh, R. Lamb, R. Lamb, O. Meijer, O. Meijer, } "On-Line Temperature Measurement In Hot Rolling Of Aluminum Using Infrared Imaging Systems", Proc. SPIE 1094, Thermosense XI: Intl Conf on Thermal Infrared Sensing for Diagnostics and Control, (21 March 1989); doi: 10.1117/12.953390; https://doi.org/10.1117/12.953390
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