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Proceedings Paper

Reflecting-cavity IR temperature sensors: an analysis of spherical, conical, and double-wedge geometries
Author(s): Jean-Claude Krapez; Paolo G. Cielo; M. Lamontagne
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Paper Abstract

Reflective cavity pyrometers are increasingly used for on-line temperature sensing of metal sheets. The presence of the reflector increases the effective emissivity of the sheet, thus reducing the measurement error. Hemispherical geometries have been mostly used in the past for the reflector. This paper presents a Monte-Carlo analysis for a number of different cavity configurations. The value of the effective emissivity is evaluated for different cavity parameters and standoff range over the sheet as well as for different degrees of the metal sheet real emissivity. It will be shown, in particular, that a trucated hemisphere with centre of curvature belowthe sheet is preferable to the more conventional full hemisphere to reduce losses due to sheet fluttering. Applications to infurnace temperature monitoring of steel sheets will be indicated.

Paper Details

Date Published: 1 October 1990
PDF: 16 pages
Proc. SPIE 1320, Infrared Technology and Applications, (1 October 1990); doi: 10.1117/12.22326
Show Author Affiliations
Jean-Claude Krapez, National Research Council Canada (France)
Paolo G. Cielo, National Research Council Canada (Canada)
M. Lamontagne, National Research Council Canada (Canada)

Published in SPIE Proceedings Vol. 1320:
Infrared Technology and Applications
Alan H. Lettington, Editor(s)

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