Changes between Version 3 and Version 4 of Tutorial/AdvancedParticleImagingVelocimetry2


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Timestamp:
Aug 27, 2013, 12:42:41 AM (8 years ago)
Author:
sommeria
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  • Tutorial/AdvancedParticleImagingVelocimetry2

    v3 v4  
    1313= making two masks =
    1414The parietal jet requires a very good resolution, particularly among x. To limitate PIV to this jet, let us create a specific mask.
    15 Open the previously created contour polygon contour_mask.xml in uvmat  by the menu bar '''!Tools/Projection object/browse...'''. Check '''edit''' (tag '''[!CheckEditObject]''').
    16 check the box '''edit''' (tag '''[!CheckEditObject]''') in the frame '''Object''' of uvmat (right hand side) to allow editing of the polygon. then replace the lower x bound 0 by 52. Then create the corresponding mask by '''Tools/make mask''', save it with name Dalsa1.mask/mask_plume.png. Similarly create a mask for the bulk Dalsa1.mask/mask_bulk.png, with bounds in x [0 55].
     15Open the previously created contour polygon contour_mask.xml in uvmat  by the menu bar '''!Tools/Projection object/browse...'''. Check the box '''edit''' (tag '''[!CheckEditObject]''') in the frame '''Object''' of uvmat (right hand side) to allow editing of the polygon. then replace the lower x bound 0 by 52. Then create the corresponding mask by '''Tools/make mask''', save it with name Dalsa1.mask/mask_plume.png. Similarly create a mask for the bulk Dalsa1.mask/mask_bulk.png, with bounds in x [0 55].
    1716 
    1817= PIV on the parietal plume =
     18Choose the following parameters:
     19pair j=1-2 for Civ1 and Civ2 : it minimises the time interval which is needed to cpature the large velocity in the plume.
     20CorrBox x,y=(5 31) which optimizes the resolution in x (5 pixels)
     21Search x, y=(25 55) which allows for a larger velocity component along y .
     22auto-grid Dx=2, Dy=10, consistent with CoorBox (about half the box size).
     23Mask selected, with name .../Dalsa1.mask/mask_plume.png .
     24For Civ2, same parameters CorrBox, auto-grid and Mask.
     25For patch and Fix, default parameters.
    1926
    2027= PIV on the interior =