Fluorescence-lifetime measurements in atmospheric-pressure flames using nanosecond-pulsed lasers

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3 Scopus citations


Measurements of fluorescence lifetimes are needed to quantify concentration measurements when using linear laser-induced fluorescence. However, lifetimes are only a few nanoseconds for many important species at atmospheric pressure. When using a typical Q-switched laser with a pulse width of about 10 ns, the fluorescence follows the shape of the laser pulse and the lifetime cannot be easily measured. In this paper, a technique is described for experimentally determining the fluorescence lifetime in atmospheric-pressure flames using a nanosecond-pulsed laser; that is, measurement of a lifetime an order-of-magnitude faster than the laser pulse itself. This technique relies on an observable temporal shift in the fluorescence signal as a function of the lifetime. Simulations show the efficacy of this approach, and data in liquid samples and in an atmospheric-pressure flame show excellent agreement with prior picosecond measurements. This technique is successful because only the temporal shift is examined and details of the fluorescence profile are ignored.

Original languageEnglish
Pages (from-to)167-174
Number of pages8
JournalApplied Physics B: Lasers and Optics
Issue number2
StatePublished - Feb 2002

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • General Physics and Astronomy


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