Reflecting-cavity IR temperature sensors: an analysis of spherical, conical, and double-wedge geometries

Jean-Claude Krapez; Paolo G. Cielo; M. Lamontagne

doi:10.1117/12.22326

1 October 1990 Reflecting-cavity IR temperature sensors: an analysis of spherical, conical, and double-wedge geometries

Jean-Claude Krapez, Paolo G. Cielo, M. Lamontagne

Proceedings Volume 1320, Infrared Technology and Applications; (1990) https://doi.org/10.1117/12.22326
Event: Eighth International Conference Infrared Technology and Applications, 1990, London, United Kingdom

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.

Citation Download Citation

Jean-Claude Krapez, Paolo G. Cielo, and M. Lamontagne "Reflecting-cavity IR temperature sensors: an analysis of spherical, conical, and double-wedge geometries", Proc. SPIE 1320, Infrared Technology and Applications, (1 October 1990); https://doi.org/10.1117/12.22326

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