A rapidhyphen;scanning optical spectrometer based on fiberoptic probes, used to measure radical emission in lowhyphen;pressure premixed laminar flames, is presented. Emission spectra and intensity profiles as a function of height above the burner have been recorded for OH, CH, and C2in an ethylene/oxygen/nitrogen flame (14percnt; C2H4, 64percnt; O2, 22percnt; N2), stabilized at 5 Torr on a sintered stainlesshyphen;steel burner. The emitted light was guided from the flame reactor to the spectrometer by fused silica optical fibers. Rapid scanning (100 scans/s) eliminates the effects of turbulence and temporal signal fluctuations, as 104ndash;105scans over a preset spectral window are collected and signal averaged within a few minutes. The technique is discussed and compared to classical methods in flame spectroscopy.
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