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Foundation ::
Visualization and Virtual Reality ::
PDT
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PDT
Particle Displacement Tracking Software
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SOURCE CODE AVAILABLE
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Particle Imaging Velocimetry (PIV) is a quantitative velocity measurement technique for measuring instantaneous planar cross sections of a flow field. The technique offers
very high precision (1%) directionally resolved velocity vector estimates, but its use has been limited by high equipment costs and complexity of operation.
Particle
Displacement Tracking (PDT) is an all-electronic PIV data acquisition and reduction procedure which is simple, fast, and easily implemented. The procedure uses a low
power, continuous wave laser and a Charge Coupled Device (CCD) camera to electronically record the particle images. A frame grabber board in a PC is used for data
acquisition and reduction processing.
PDT eliminates the need for photographic processing, has moderately low system costs, and provides reduced data within seconds of
acquisition. The technique results in velocity estimate accuracies on the order of 5%.
The software is fully menu-driven from the acquisition to the reduction and analysis of the data. Options are available to acquire a single image or 5- or 25-field series of
images separated in time by multiples of 1/60 second. The user may process each image, specifying its boundaries to remove unwanted glare from the periphery and
adjusting its background level to clearly resolve the particle images. Data reduction routines determine the particle image centroids and create time history files.
PDT then
identifies the velocity vectors which describe the particle movement in the flow field. Graphical data analysis routines are included which allow the user to graph the time
history files and display the velocity vector maps, interpolated velocity vector grids, iso-velocity vector contours, and flow streamlines.
PDT carries the NASA case number LEW-14925. It was originally released as part of the COSMIC collection.
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