Applied Physics B

, Volume 80, Issue 2, pp 147–150 | Cite as

Toluene LIF at elevated temperatures: implications for fuel–air ratio measurements

  • W. Koban
  • J.D. Koch
  • R.K. Hanson
  • C. Schulz
Rapid communication


Toluene laser-induced fluorescence (LIF) was investigated for 266- and 248-nm excitation in the temperature range of 300–650 K in a nitrogen/oxygen bath gas of 1 bar total pressure with oxygen partial pressure in the range 0–400 mbar. Contrary to a popular assumption, the toluene LIF signal is not directly proportional to the fuel–air ratio (termed the FAR-LIF assumption) for many conditions relevant to reciprocating IC engines. With increasing temperature, a higher oxygen partial pressure is required to justify the FAR-LIF assumption. The required oxygen pressure becomes unrealistic (>5 bar) for T>670 K at 266-nm excitation and for T>625 K at 248-nm excitation.


Absorption Cross Section Homogenous Charge Compression Ignition Compression Stroke Oxygen Quenching High Oxygen Partial Pressure 
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Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  1. 1.PCI, Physikalisch-Chemisches InstitutUniversity of HeidelbergHeidelbergGermany
  2. 2.Mechanical Engineering DepartmentStanford UniversityStanfordUSA
  3. 3.IVG, Institut fuer Verbrennung und GasdynamikUniversitaet Duisburg-EssenDuisburgGermany

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