Applied Physics B

, Volume 69, Issue 2, pp 137–146

A pulse-pileup correction procedure for rapid measurements of hydroxyl concentrations using picosecond time-resolved laser-induced fluorescence

  • M.W. Renfro
  • S.D. Pack
  • G.B. King
  • N.M. Laurendeau
Regular paper

DOI: 10.1007/s003400050786

Cite this article as:
Renfro, M., Pack, S., King, G. et al. Appl Phys B (1999) 69: 137. doi:10.1007/s003400050786

Abstract.

The measurement of fluorescence lifetimes is important for determining minor-species concentrations in flames when using linear laser-induced fluorescence (LIF). Applications of LIF to turbulent flames require that the quenching rate coefficient be determined in less than ∼100 μs. Moreover, the measurement technique must be insensitive to the existence of relatively large backgrounds, such as occur from flame emission. To meet these goals, we have recently developed a rapid, gated photon-counting technique, termed LIFTIME. However, for ultimate application to turbulent time-series measurements, LIFTIME must be extended to photon count rates which unfortunately result in nonlinear discriminator operation. In this paper, a correction technique is derived to permit quantitative measurements of fluorescence lifetimes and concentrations at sampling rates up to 4 kHz. The technique was tested against liquid samples having a known lifetime and is further shown to reproduce previous hydroxyl concentration measurements in a series of laminar flames with total photon count rates of up to ∼35 million detected photoelectrons per second. The fluorescence lifetimes and hydroxyl concentrations are shown to be measured with ∼10% accuracy (68% confidence interval) for sampling times as low as 250 μs.

PACS: 82.40; 34.50; 02.50

Copyright information

© Springer-Verlag 1999

Authors and Affiliations

  • M.W. Renfro
    • 1
  • S.D. Pack
    • 1
  • G.B. King
    • 1
  • N.M. Laurendeau
    • 1
  1. 1.Flame Diagnostics Laboratory, School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907-1288, USAUS