----------------------------------------------------------------------------
Instructions for the analysis of case A : 
Loss of seeding in the core of a tip vortex
26.10.2000 		christian.kaehler@dlr.de

Image A001_1.tif and A001_2.tif were recorded at the DNW-LLF in order
to study experimentally the wake vortex formation behind a transport
aircraft (DLR ALVAST half model) in landing configuration (U=60 m/s,
main flow direction is perpendicular to the light-sheet plane). The
measurement position was 1.64 m behind the wing tip and the field of
view is 170 mm by 140 mm. The images were selected as strong gradients,
loss of image density, and varying particle image sizes are common
problems for many PIV applications in large wind tunnels.  


Camera characteristics:

Type                                	PCO SensiCam, see http://www.pco.de 
Sensor technology              		Progressive Scan
Resolution                          	1280 pixel x1024 pixel.
Pixel   size                       	6.7 micrometer x 6.7 micrometer
Dynamic range                     	12 bits (Peltier cooled) 
Quantum efficiency             		typ 40 % 
Full well capacity                  	25000 e 
Readout noise @ 12.5MHz			7 ... 8 e
			

• Image #1(1.3MB)
• Image #2(1.3MB)

• The flow field was strong vortex generated on the computer. The field parameter is not known.

• The particle scatter was assumed to be the gaussian distribution.
• The oclusion particle was considered. The intensity of the particles were linerly added.
• Fill factor was assumed to be 0.7.
• Particle diameters were randomly determined. The histogram of the particle diameter was gaussian distribution.
• Laser light sheet intensity was assumed to be gaussian. Maximum out-of-plane velocity was set to be about 30% of laser light thickness.

• Case 1: high particle density and small particle
  • Image #1(260KB)
  • Image #2(260KB)
• Case 2: high particle density and large particle
  • Image #1(260KB)
  • Image #2(260KB)
• Case 3: medium particle density and small particle
  • Image #1(260KB)
  • Image #2(260KB)
• Case 4: medium particle density and large particle
  • Image #1(260KB)
  • Image #2(260KB)
• Case 5: low particle density and small particle
  • Image #1(260KB)
  • Image #2(260KB)
• Case 6: low particle density and large particle
  • Image #1(260KB)
  • Image #2(260KB)

Instructions for the analysis of case C : Strong wall reflection

28/10/00 contact : Pr Stanislas pivnet-sig32@univ-lille1.fr

The set of images is referenced C001_1.tif and C001_2.tif. 
Their size is 1000 x 512 pixel. 
They are provided in tif format with a header of  8 pixels. 
These images were recorded in a centrifugal impeller 
with a pulsed YAG laser (about 300 mJ/pulse) and PEG smoke 
(about 1 micron in diameter). 
They are selected for the strong reflection occurring 
on the trailing edge of the blade. 
The black line going across the field 
from bottom right to top left is a shadow 
used to limit the flare on the trailing edge. 
The two white circles are the two edges of the fixed 
vaneless diffuser.

Camera characteristics

Type			KODAK ES1.0 b & w
Resolution		1008x1018 pixels.
Framing rate		30 frames/s.
Image capture		Progressive Scan, full frame.
			asynchronous reset.
			single or double exposure.
CCD	size		9,072 x 9,162 mm.
Pixel	size		9micro-m x 9micro-m.
Image coding		8 bits.
Gamma			1.
Exposure time		In double exposure mode:
			255 micro-s for image 1.
			32.436 ms for image 2.
Lens			Nikkor 35 mm f/2.
Acquisition software	INSIGHT 2.10.


Together with the PIV images are provided 2 background 
images named Cbg_1.tif and Cbg_2.tif in the same format. 
These images were obtained in the same experimental 
conditions, just by cutting of the seeding.

Also provided is 1 mask named Cmask_1.tif, in the form of a 
binary image, corresponding to the obstacles present in the image. 
The measurement points inside the black mask should have 
a value of 0 in the velocity matrix and in the flag matrix. 

The reference analysis for this case is :

  :ev_IS_size_x                     = 32;
  :ev_IS_size_y                     = 32;
  :ev_IS_size_unit         = "pixel";  
  :ev_IS_grid_distance_x          = 16;
  :ev_IS_grid_distance_y          = 16;
  :ev_IS_grid_distance_unit      = "pixel";
  :ev_origin_of_evaluation        = 16, 16;
  :ev_origin_of_evaluation_units  = "pixel";
  :ev_IS_offset   = 0, 0;
  :ev_IS_offset_units = "pixel";
  :ev_CF_xy_distortion = 1.0 ;
  :ev_cf_fill_ratio = 0.6;

The mandatory data to be provided are :

Raw data : C001_team_ref_raw.nc

-	the raw velocity field corresponding to the highest 
	correlation peak outside the mask (raw)
-	the corresponding histogram , 
-	4 samples of correlation windows at

	   x (pixels)  y (pixels)
	       624       256
	       288       352
	       160       160
	       896       432

-	a matrix of correlation peak height
-	the type of processor used
-	the processing time per velocity vector


Post processed data : C001_team_ref_clean.nc

-	the post-processed velocity fields without interpolation 
	and/or filtering with the corresponding histogram (clean), 
-	a flag matrix giving the location of spurious vectors and holes 
-	a matrix of correlation peak height
-	the mean velocity over the map outside the mask (Umean, Vmean)
-	the standard deviation over the map outside the mask (u', v')
-	the total number of valid vectors
-	the type of processor used
-	the processing time per velocity vector.

Interpolated data :

Interpolated velocity map is optional for this set.

• Images
  • Image #1(500KB)
  • Image #2(500KB)
• Background
  • Background Image #1(500KB)
  • Background Image #2(500KB)
• Mask
  • Mask Image #1(500KB)

• The flow field was shear field generated by computer. The field parameter is not known. The non-uniform illumination condision was simulated.

• The particle scatter was assumed to be the gaussian distribution.
• The oclusion particle was considered. The intensity of the particles were linerly added.
• Fill factor was assumed to be 0.7.
• Particle diameters were randomly determined. The histogram of the particle diameter was gaussian distribution.
• Laser light sheet intensity was assumed to be gaussian. Maximum out-of-plane velocity was set to be about 20% of laser light thickness.
• Illumination intensity was varied.

The reference analysis for this case is :

:ev_IS_size_x                           = 16;
:ev_IS_size_y                           = 16;
:ev_IS_size_unit			= "pixel";
:ev_IS_grid_distance_x                	= 8; 
:ev_IS_grid_distance_y               	= 8; 
:ev_IS_grid_distance_unit		= "pixel"; 
:ev_origin_of_evaluation		= 8, 8;
:ev_origin_of_evaluation_units    	= "pixel";
:ev_IS_offset                        	= 0, 0;
:ev_IS_offset_units                	= "pixel";
:ev_cf_fill_ratio                       = 0.7;




The mandatory data to be provided are :


Raw data : E00?_team_ref_raw.nc

-  the raw velocity field corresponding to the highest correlation 
   peak outside the mask (raw)
-  the corresponding histogram , 
-  3 samples of correlation windows at

    x(pixels)   y(pixels)
       32        32
       32        64
       32        96

-  a matrix of correlation peak height
-  the type of processor used
-  the processing time per velocity vector

-  Velocity distribution on the following vertical line
     x =  64
     x = 160
     x = 208
     x = 224

-  Velocity distribution on the following horizontal line
     y =  64


Post processed data : B00?_team_ref_clean.nc

-  the post-processed velocity fields without interpolation 
     and/or filtering with the corresponding histogram (clean), 
-  a flag matrix giving the location of spurious vectors and holes 
-  a matrix of correlation peak height
-  the mean velocity over the map (Umean, Vmean)
-  the standard deviation over the map (u', v')
-  the total number of valid vectors
-  the type of processor used

-  Velocity distribution on the following vertical line
     x =  64
     x = 160
     x = 208
     x = 224


-  Velocity distribution on the following horizontal line
     y =  64


Interpolated data :

Interpolated velocity map is optional for this set.

• Case 1:
  • Image #1(33KB)
  • Image #2(33KB)
• Case 2:
  • Image #1(33KB)
  • Image #2(33KB)
• Case 3:
  • Image #1(33KB)
  • Image #2(33KB)
• Case 4:
  • Image #1(33KB)
  • Image #2(33KB)
• Case 5:
  • Image #1(33KB)
  • Image #2(33KB)
• Case 6:
  • Image #1(33KB)
  • Image #2(33KB)
• Case 7:
  • Image #1(33KB)
  • Image #2(33KB)
• Case 8:
  • Image #1(33KB)
  • Image #2(33KB)