In a near-production internal combustion engine, the effective fluorescence lifetime of toluene was determined by time-correlated single-photon counting with a minimally invasive fiber-optic spark-plug sensor. The lifetime measurement provided continuous crank-angle-resolved measurements of gas temperature. Proof-of-concept experiments in a motored four-cylinder spark-ignition engine were evaluated with a time resolution of 500 μs, yielding temperature precision of 25 K (standard deviation) at top-dead center. In these experiments, 10% toluene was added to the nonfluorescent base fuel iso-octane. Fluorescence lifetimes were related to temperature via calibration measurements in a high temperature pressure vessel, with the data fitted to a functional dependence derived from a previously published phenomenological model.
© 2012 Optical Society of AmericaFull Article | PDF Article
Peter Andresen, Gerard Meijer, Harald Schlüter, Heiner Voges, Andrea Koch, Werner Hentschel, Winfried Oppermann, and Erhard Rothe
Appl. Opt. 29(16) 2392-2404 (1990)
Marco Taschek, Jan Egermann, Sabrina Schwarz, and Alfred Leipertz
Appl. Opt. 44(31) 6606-6615 (2005)
James D. Smith and Volker Sick
Appl. Opt. 44(31) 6682-6691 (2005)