3d Determination of Very Dense Particle Velocity Fields

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【标题】3d Determination of Very Dense Particle Velocity Fields

【作者】 Torsten Putze  Hans-Gerd Maas 

【关键词】Particle Tracking Spatial Resolution Tomographic Reconstruction Observation Volume Object Space 

【摘要】The paper presents some improvements to a novel approach for the determination of 3-D flow velocity fields; which is based on 3-D particle tracking in a tomographic reconstruction of an observation volume seeded with tracer particles. The basic idea of the approach is using multiple camera views for a full tomographic reconstruction of the object space; which is represented by a 3-D voxel structure with a resolution adapted to the camera resolution. Based on the images of four or more convergent cameras with their orientation known from a prior calibration procedure; a complete 3-D light intensity distribution in the observation volume can be reconstructed by a projective transformation of each camera image contents into each depth layer of the object space and a consecutive minimum search. 3-D velocity field information can then be obtained by volume-based tracking in time-resolved voxel space representations. This procedure represents a rather elegant way of completely avoiding detection and matching ambiguities; thus allowing for a significant increase of the spatial resolution of 3-D particle tracking. The paper will show the basic concept of tomographic reconstruction and tracking in 3D-PTV and show some first results from processing synthetic data sets. The computational effort; accuracy and spatial resolution potential of the technique will be compared to conventional 3-D particle tracking velocimetry.

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