Abstract
A new technique for instantaneous rotational temperature measurement of OH radicals has been developed for combustion diagnostics using a rapid-frequency-scan (RAFS) laser system. The RAFS laser excites OH radicals (X2Π←A2Σ+) in an atmospheric flame, and the intensities of rotational lines are measured with laser-induced fluorescence spectroscopy (LIF), and the rotational temperature of the flame is determined. Measurement of the spatial distribution of the temperature along the laser beam is demonstrated by the parallel sampling of the LIF signals in a single laser shot.
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