Fluorescence-lifetime measurements in atmospheric-pressure flames using nanosecond-pulsed lasers |
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Authors: | MW Renfro |
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Institution: | (1) School of Mechanical Engineering, Purdue University, West Lafayette, Indiana 47907-1288, USA, US |
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Abstract: | 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.
Received: 23 August 2001 / Revised version: 19 November 2001 / Published online: 17 January 2002 |
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Keywords: | PACS: 33 50 Hv 42 62 Fi 47 70 Fw |
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