Tomographic Particle Image Velocimetry (Tomo-PIV) is a novel technique for 3D velocity measurements. The three-dimensional particle distribution within a volume is reconstructed by optical tomography from 2D images taken from typically 4 viewing directions simultaneously.

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Velocity information results from three-dimensional particle pattern cross-correlation of two reconstructed volumes obtained from subsequent exposures. The technique is fully digital and allows relatively high seeding (information) density and provides dense vector fields, compared to sparse 3D-particle tracking. The method is truly instantaneous across the volume, as opposed to scanning PIV and is suited for fast flows requiring small dts between exposures and allows an extension to high time resolution using high speed cameras.