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Title"Disappearing object" radiation thermometer for low-emissivity process control
Publication TypeJournal Article
Year of Publication2010
AuthorsSaunders, P., and White D.R.
JournalInternational Journal of Thermophysics
Pagination1583 - 1598
Date Published2010
ISSN0195928X (ISSN)
Keywordsaluminum, Aluminum extrusion, Blackbody cavity, Current measurements, Design Principles, Electromagnetic wave emission, Extrusion, Galvannealing, Low emissivity, Practical realizations, Process control, Process temperature, Radiation thermometers, Radiation thermometry, Steel strip, Strip mills, Target temperature, Thermometers, Uncertainty analysis
AbstractOne of the long-standing problems in metals-processing industries is the measurement of the temperature of low-emissivity targets. Such measurements are typically accompanied by problems with reflections and highly variable emissivity, so conventional spectral-band radiation thermometry is subject to large errors and uncertainties. This article presents the design principles of a novel radiation thermometer that places the target inside a blackbody cavity at the desired process temperature. Uncertainties in the measurements of target temperature due to reflections and the target emissivity fall in proportion to the difference between the target and process temperatures, and are minimized when the target is at the desired process temperature. This procedure enables accurate control of the process to a level near the minimum uncertainty, which is lower than those for other current measurement techniques. The article presents the uncertainty analysis for the new thermometer, and suggests practical realizations for applications in aluminum extrusion plants and steel strip mills. © Springer Science+Business Media, LLC 2010.

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