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Particle tracking velocimetry
Particle tracking velocimetry (PTV) is one of velocimetry methods, i.e a technique to measure velocity of particles. The name suggests that the particles are tracked, and not only recorded as an image as it is suggested in another form, particle image velocimetry. There are two very different experimental methods:
Additional recommended knowledge
A typical installation of the 3D-Particle tracking velocimetry consists of three or four digital cameras, installed in an angular configuration, synchroniously recording the diffracted or fluorescent light from the flow tracers, seeded in the flow. The flow is illuminated by a collimated laser beam, or by another source of light. There is no restriction on the light to be coherent or monochromatic and only its illuminance has to be sufficient to illuminate the observational volume. Particles or tracers could be fluorescent, diffractive, tracked through as many as possible consecutive frames on as many cameras as possible. In principle, two cameras in the stereoscopic configuration are sufficient in order to determine the three coordinates of a particle in space, but in most practical situations, three or four cameras are necessary.
Example of 3D-PTV facility, with 4 CCD cameras and the laser illumination from the bottom of a glass tank. In courtesy of J. Willneff, ETH Zurich. 
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Particle_tracking_velocimetry". A list of authors is available in Wikipedia.|