Quantitative flow visualization in sodium vapor seeded hypersonic helium
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Sodium vapor seeded into a hypersonic helium flow through an orifice on a model is used as a tracer to determine velocity profiles. A narrow-linewidth tunable dye laser is scanned across the Doppler-shifted absorption line of the sodium and the resonant fluorescence is observed. Curves showing the velocity-shifted pressure- and temperature-broadened absorption lines at several points in the flow are presented. Fluorescence is strong enough to use this technique for quantitative flow visualization: at each laser frequency, a specific velocity component is highlighted and easily observed by eye.
author list (cited authors)
Miles, R. B., Udd, E., & Zimmermann, M.