Laser-induced Fluorescence Triple-integration Method Applied to Hydroxyl Concentration and Fluorescence Lifetime Measurements

S. D. Pack, M. W. Renfro, G. B. King, N. M. Laurendeau

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


We report quantitative hydroxyl concentrations obtained by using a new laser-induced fluorescence triple-integration method (LIFTIME), which is capable of rapid and continuous fluorescence lifetime measurements via a unique photon-counting technique. LIFTIME has been convolved with picosecond time-resolved laser-induced fluorescence to permit the rapid monitoring of instantaneous species concentrations in flames. Here, LIFTIME is used to measure hydroxyl concentrations and fluorescence lifetimes at a sampling rate of 1 Hz in eight premixed laminar flat flames and in one laminar opposed flow diffusion flame. Fluorescence lifetimes as a function of axial position are generally obtained with less than 5% uncertainty, while concentrations at the same locations are obtained with less than 10% uncertainty (95% confidence interval). The hydroxyl concentration measurements are shown to agree well with modeling predictions and with previous laser-saturated fluorescence measurements. The measurements are also compared with predictions based on existing quenching cross-section correlations.

Original languageEnglish
Pages (from-to)405-425
Number of pages21
JournalCombustion Science and Technology
Issue number1-6
StatePublished - 1998

Bibliographical note

Funding Information:
The authors appreciate the financial support of this project by the Air Force Office of Scientific Research, with Dr. Julian Tishkoff as technical monitor.


  • Fluorescence lifetime
  • Hydroxyl concentrations
  • Laminar premixed flames
  • Laser-induced fluorescence

ASJC Scopus subject areas

  • Chemistry (all)
  • Chemical Engineering (all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Physics and Astronomy (all)


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