Abstract
Spectroscopic methods for the nonintrusive measurement of flow field properties such as velocities, temperature, and pressure have relied on observing variations in the laser-induced fluorescence due to line shifts, line broadening, density fluctuations, or ratios of line strengths. Although there has been some recent indication that direct laser-induced fluorescence from the SchumannRunge bands in oxygen might be useful for temperature and density measurements,1 velocity measurements in air require the introduction of a foreign gas, such as iodine, whose absorption lines are accessible to a tunable narrow linewldth laser and narrow enough to permit the Doppler shift to be utilized. In large facilities, the introduction of such a reactive gas is highly undesirable due to corrosion, pollution, and questions of condensation and proper gas mixing.
© 1986 Optical Society of America
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