Abstract
It is demonstrated that the well known rotational Raman spectrum of H2 can be used to find the relative densities of hydrogen and the gas temperature as a function of position. A line-shaped beam from a tunable excimer laser intersects H2–air flames. Scattered light is acquired with an imaging spectrograph. This produces both Stokes and anti-Stokes spectra. By adjusting the laser beam’s polarization, the interfering Rayleigh intensity is sufficiently reduced without the use of a filter. The temperature measurements can be from below room temperature to about 1200 K. The method also works at temperatures >1200 K, but the use of vibrational Raman spectroscopy is probably better there. Also shown is an image that has simultaneously acquired, spatially resolved spectra from rotational Raman, vibrational Raman and laser-induced fluorescence. Such combined information might be used to diagnose a gaeous system in some detail. © 1997 John Wiley & Sons, Ltd.
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