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Abstract:
Fluid simulation is one of the most active research areas in computer graphics.
However, it remains difficult to obtain measurements of real fluid flows for
validation of the simulated data.
In this paper, we take a step in the direction of capturing flow data for such
purposes. Specifically, we present the first time-resolved Schlieren tomography
system for capturing full 3D, non-stationary gas flows on a dense volumetric
grid. Schlieren tomography uses 2D ray deflection measurements to reconstruct a
time-varying grid of 3D refractive index values, which directly correspond to
physical properties of the flow. We derive a new solution for this
reconstruction problem that lends itself to efficient algorithms that robustly
work with relatively small numbers of cameras. Our physical system is easy to
set up, and consists of an array of relatively low cost rolling-shutter
camcorders that are synchronized with a new approach. We demonstrate our method
with real measurements, and analyze precision with synthetic data for which
ground truth information is available.
