Community Research and Development Information Service - CORDIS


Centre de Recherche Métallurgiques' (CRM's) research has demonstrated that the feasibility of the arithmetic roughness (Ra) of stochastical surfaces can be determined from an optical method based on the intensity measurement of specularly reflected beams. The gauge works at the 10.6 um wavelength. A CO(2) laser radiation is spread into incident beams which oscillate in 2 perpendicularly planes enabling pyroelectric detectors to capture the specular beams whatever the thickness, the flatness and the location of the strip may change at the exit of a cold mill. The signals are samples by a personal computer (PC) which selects the channel giving the best accuracy on the computed Ra. A monitor displays the mean Ra and plots the instantaneous Ra data over the coil. Since October 1992, this gauge has measured the strip roughness on the temper mill 3 with an accuracy amounting to 10% in the 0.2 um to 3 um range. Two further devices have been setup on cold mills at Ferblatil and Port Talbot works.

Additional information

Authors: PIRLET R, Centre de Recherches Métallurgiques, Liège (BE);MOREAS G, Centre de Recherches Métallurgiques, Liège (BE);SCHYNS M, Centre de Recherches Métallurgiques, Liège (BE);DHAESE G, Sidmar, Gand (BE);BOUQUEGNEAU D, Cockerill Sambre, Bruxelles (BE);WILLIAMS C, British Steel, London (GB)
Bibliographic Reference: EUR 15799 FR (1996) 81pp., FS, ECU 11.50
Availability: Available from the (2)
ISBN: ISBN 92-827-5553-3
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