Journal
INFRARED PHYSICS & TECHNOLOGY
Volume 61, Issue -, Pages 20-26Publisher
ELSEVIER
DOI: 10.1016/j.infrared.2013.07.005
Keywords
Temperature measurement; IR detectors; Emissivity; Continuous industrial furnaces
Categories
Funding
- CENTEM [CZ.1.05/2.1.00/03.0088]
- ERDF as part of the Ministry of Education, Youth, and Sports OP RDI program
- PIKE AUTOMATION control and optimization solutions supplier
- Ministry of Industry and Trade of the Czech Republic [FR-TI1/421, FR-TI1/273]
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Continuous furnaces are commonly used for steel billet reheating before a rolling operation. It is necessary to perform a number of measurements to set-up and operate the optimization system of the furnaces correctly. A charge temperature measurement using infrared detectors can be one of the usable measurement techniques. This non-contact measurement method is based on the detection of infrared radiation emitted from a measured surface. The radiation intensity depends on the surface temperature and emissivity, which is one of the most important parameters for infrared measurements. Advantages of the non-contact temperature measurement, as well as some problems regarding the surface emissivity, are presented. The direct steel billet temperature measurement procedure using infra-red detectors, emissivity determination procedures, and example results are introduced. It is shown that steel emissivity can vary from approx. 0.17 to 0.8, depending on the surface state, scale formation, and wavelength interval. These problems are critical for the charge temperature measurement using the infra-red detectors, and are discussed in this paper. (C) 2013 Elsevier B.V. All rights reserved.
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