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Two methods of optical measurement based on fluorescence and infrared absorption have been investigated and prototype measuring devices manufactured for the measurement of oil films on cold strip. The fluorescence method uses the fluorescence excited by UV light of the aromatic hydrocarbons contained in mineral oils. The method features a high sensitivity and a short response time. Photolysis effect lead, however, to systematic measured value variations. Calibration problems are caused by the fluctuating aromatic compound content of the oils. By addition of fluorescent dyes the method can be used also for the detection of synthetic oils. 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. The oil film thickness dependent absorption is determined by reflection measurements with various wavelengths. The infrared measuring device has been tested in two application variants. The investigations have shown that the values measured by the infrared device are affected by film thickness variations and by oil surface reflections. These nonlinear effects could be compensated to a large extent by material specific calibration.

Additional information

Authors: KRANNICH S, VDEh, Düsseldorf (DE)
Bibliographic Reference: EUR 15592 DE (1996) 31pp., FS, ECU 7
Availability: Available from the (2)
ISBN: ISBN 92-827-6477-X
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