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  • New method for contactless measurement of true temperature of hot steel strips and control of the total thermal process by in situ spectroscopy

Abstract

Final report on Contract No 7210-PR/097, 1 July 1998 to 30 June 2001.

The project's objective was to work out a new way of measuring the true radiation temperature of technical hot surfaces using an FTIR spectrometer in the middle infrared range between 400cm{-1} and 7500cm{-1}. As a rule, parasitic radiation of the furnace walls is reflected specularly on the sheet and reaches the window of every radiation collecting device. This parasitic radiation superposes to the thermal radiation originating from the sample causing faulty temperature evaluation. Despite some well-known measures, parasitic wall radiation can never be so suppressed as to have no influence on the temperature result. Nevertheless, due to the very small aperture angle of the spectrometer, the loss of spatial coherence of radiation being incident with a solid angle greater than the aperture angle prevents its interference, dropping its contribution to the spectrometer signal to zero. Due to the measurement of the whole temperature profile, the generally unknown emissivity coefficient can be separated from the temperature evaluation and determined in a second step. Furthermore, test function concepts work without the knowledge of emissivity. In addition, components of the thermal process, such as combustion gas, C, H(2)O and others, generate narrow absorption lines which can be used to identify the compounds and to control the main thermal process and its disturbances. Scaling layers can be identified giving hints about some incomplete chemical reactions in the furnace.

Additional information

Authors: CASAJUS A, EKO Stahl, Eisenhüttenstadt (DE);POWELL J M, British Steel Strip Products, Port Talbot (GB);MUILWIJK F, Corus RDT, Rotherham (GB);RENDUELES VIGIL J L, Aceralia, Avilés (ES)
Bibliographic Reference: EUR 20463 EN (2002), pp.105. Euro: 16.00
Availability: EUR-OP reference: KI-NA-20463-EN-S Available from EUR-OP sales agents. URL: http://eur-op.eu
ISBN: ISBN: 92-894-4237-9
Record Number: 200215514 / Last updated on: 2002-11-20
Category: PUBLICATION
Original language: en
Available languages: en