The use of polychromatic sequential light pulses in particle streaking and
tracking velocimetry is proposed. The main advantage of this technique is t
he easy determination of the velocity direction, even in recycling flows. T
he method has been validated on a hydrodynamic flow, in the wake of a conve
ntional cylindrical model. (C) 1999 Published by Elsevier Science B.V. All
rights reserved.