Quantitative flow visualization in sodium vapor seeded hypersonic helium Academic Article uri icon


  • 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.

citation count

  • 20

complete list of authors

  • Miles, RB||Udd, E||Zimmermann, M

publication date

  • March 1978