Recent work1 showing that UV Rayleigh scattering is a viable tool for instantaneous flow field diagnostics raises the possibility of using the Doppler shift of the scattering as a method for velocity measurements. By illuminating the flow field with a narrow linewidth laser and observing scattering through an atomic or molecular blocking filter,2 the frequency shift can be converted to an intensity variation so the velocity can be measured. The atomic or molecular blocking filter window is simply an absorption cell placed in front of the camera, so instantaneous 2-D cross-sectional images of the flow field can be recorded.

© 1990 Optical Society of America

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