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Final report on Contract No 7215-PP/022, 1 July 1998 to 30 June 2001.

With the development of this project, a new and advanced technology has been realised for hot-slab surface inspection and installed in Aceralia (Spain).

An innovative online hot-slab inspection system - integrating novel conoscopic holography, CCD cameras, a mechanical system and intelligent tools - is able to determine the slab quality level in real time. Conoscopic holography is a new technique based on an incoherent light interferometry of the ordinary and extraordinary rays of light through a uniaxial crystal. The main advantages are that the signal is collinear and very accurate and the range of measurement can be easily changed. Another advantage is that radiation of the hot slabs under inspection does not have a negative influence on the quality of images and holograms used in this project.

This system, which operates in the real environment of an industrial continuous casting facility, allows hot-slab surface inspection, detecting cracks - without removing the surface scale - and inclusions, only removing a small strip in one of the wide faces of the slab.

The new integrated system is an important technological breakthrough; it offers a wide range of possibilities for implementing an automatic surface inspection system. It will enable the steelmaker to raise productivity, assess the surface quality of the slabs and increase hot load in the following downstream facilities, thus achieving a substantial cost reduction and improving the yield of the process.

Additional information

Authors: SANCHO L F, Aceralia, Avilés (ES);FALESSI R, CSM, Rome (IT);DIEZ A, Universidad de Oviedo, Gijón (ES)
Bibliographic Reference: EUR 20461 EN (2002), pp.133. Euro: 20.50
Availability: EUR-OP reference: KI-NA-20461-EN-S Available from EUR-OP sales agents. URL:
ISBN: ISBN: 92-894-4238-7
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