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Two optical measurement methods for the determination of oil residues and iron fines on cold-rolled strip, based on infrared absorption and reflectivity respectively, were investigated and specimen equipment was built. The infrared method, which is largely independent of the oil composition, is based on the oil-typical absorption in the range of CH stretching vibrations. It was found, however, that the infrared method is sufficiently sensitive for this application. Further work was therefore focused on the more sensitive fluorescence method. This fluorescence technique utilizes the fluorescence of the aromatic hydrocarbons contained in mineral oils, which can be excited by ultraviolet light. By adding a fluorescence dye of sufficient light and temperature stability it became possible to use this method even with synthetic oils and rolling emulsions.

The contamination of the strip surface with iron fines is determined by reflection measurements in the visible wavelength range. The influence of parameters such as roughness, iron fines and oil residue on the reflection and fluorescence patterns was determined through a series of extensive laboratory experiments. An industrial measuring unit was developed for use in a tandem rolling mill. .

Additional information

Authors: KRANNICH S, Betriebsforschungsinstitut (BFI), Düsseldorf (DE)
Bibliographic Reference: EUR 16630 DE (1997) 52pp., FS, ECU 10.00
Availability: Available from the (2)
ISBN: ISBN 92-828-0086-5
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