Laser spectroscopy measures motor oil consumption

Stefan Sellmeier, Eduardo Alonso, Ulrich Boesl, Christian Menhard, Reinhard Kelnberger, Heinz Bacher

Research output: Contribution to specialist publicationArticle


Spectroscopic analysis based on a tunable UV laser enables a prototype system to analyze motor oil consumption in combustion engines using the SO 2 derived from emissions. The Technical University of Munich, Germany, BMW Group, and InnoLas Laser have jointly developed the procedure with which motor oil consumption can be measured quickly, exactly, and reliably. It involves the use of sulfur as a motor oil indicator, minimal traces of which are detected in the exhaust gas. This kind of motor oil consumption analytics is possible due to the introduction of sulfur-free fuel. The procedure has a number of significant advantages, such as converting sulfur-containing molecules into SO2 in a small gas discharge cell and detecting the SO2 by a special method of laser-induced fluorescence employing a newly developed compact ultraviolet (UV) laser with tunable wavelength.

Original languageEnglish
Number of pages5
Specialist publicationLaser Focus World
StatePublished - Dec 2012


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