Abstract
A technique has been developed whereby the three-dimensional motion of tracers in a fluid flow is automatically analysed. Simultaneous orthogonal views of the tracer-seeded flow were recorded by a single high speed cine camera through a split field mirror system, and subsequently converted to machine readable form by a video digitizer. Digital enhancement was used to separate the tracers from the contrasting background. Algorithms were developed to match the projections of individual tracers in the two views, obtain the three-dimensional coordinates, follow the tracers from frame to frame and compute the velocity vectors along the particle trajectories. Eulerian information was derived from the pooled velocity data points by interpolation on a regular spatial grid. Tests of the method on particle trajectories obtained in a small water tunnel have shown that the tracking is reliable even for rapidly changing and closely spaced paths.
Published Version
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