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B. R. WIESENT1,* , D. G. DORIGO1, F. JÜLICH1, Ö. ŞIMŞEK1, A. W. KOCH1
The viscosity is one of the most important properties of lubricants. This parameter has to be adopted to the specific operation conditions where the lubricant is used. We used laser induced fluorescence (LIF) with deep UV excitation at 248 nm and a fibre optic probe to measure viscosity levels of fresh synthetic oil samples. Three types of synthetic oils each with seven different viscosity levels in the range of 32 to 320 mm²/s were measured. A small low cost fibre coupled grating spectrometer was used as interrogator. The different viscosities can be distinguished by their fluorescence intensity distribution in the spectral range 320 to 550 nm. The measured fluorescence spectra of all three oils show characteristic features which allow a clear classification of the fresh oil viscosity levels. To predict fresh oil viscosity levels in a linear model, a partial least squares regression (PLS1) was applied to the gained spectral data set. We reached a good model quality of viscosity levels of all three types of fresh oil. The used setup can also be constructed in a robust and very cost effective manner using a deep UV 250 nm LED and a low resolution VIS grating spectrometer. In-situ measurement of oil viscosity in production processes is possible as well..
Oil analysis, Oil sensor, Laser induced fluorescence, Viscosity.
B. R. WIESENT, D. G. DORIGO, F. JÜLICH, Ö. ŞIMŞEK, A. W. KOCH, Viscosity measurement of synthetic oils by means of laser induced fluorescence, Optoelectronics and Advanced Materials - Rapid Communications, 5, 11, November 2011, pp.1162-1165 (2011).
Submitted at: Nov. 2, 2011
Accepted at: Nov. 23, 2011
Optoelectronics and Advanced Materials - Rapid Communications
(2022): 0.5 - 2022 Journal Citation Reports (Clarivate Analytics, 2023)
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