Department MTM,

1
WELCOME

• Department MTM,
• MATERIALS PERFORMANCE AND NON-DESTRUCTIVE TESTING
• Katholieke Universiteit Leuven
• Belgium

2
µCT equipment at MTM

• Skyscan 1072
• 0-130 kV, 0-300 µA, microfocal spot size 10 µm
  (10 Watt) / 30-40 µm (40 Watt)
• X-Ray detector Cooled CCD-sensor 1024 x 1024
  pixels, 10 bit dynamic range
• Object manipulator 400 mm linear movement
• 20 mm lifting, 2 µm step size, 360 rotation,
  0.45 step size
• AEA Tomohawk on the Philips HOMX 161
• X-Ray source (Philips HOMX 161)
• Focal spot 5 to 200 µm
• Voltage range 5 - 160 kV, current up to 3,2 mA as
  low as 0,03 mA
• Distance source-object 15 mm to 920 mm, distance
  source-image intensifier 520-1500 mm
• Image intensifier TH 9428HX with field of view
  220 mm / 170 mm / 115 mm
• X-Ray detector CCD-sensor 1024 x 1024 pixels, 10
  bit dynamic range ADIMEC MX12P
• Object manipulators HOMX 161 X-Ray detector
  movement, object X, Y and Z movement
• Servostep 1700 Object rotation 0.01 step size
  and object X movement 1 µm stepsize

3
Achievements

• Filters in front of X-ray source or in front of
  detector
• Dual energy procedures
• Image enhancement programmes (denoising, missing
  lines, )
• Programmes for quantitative data deduction from
  µCT images
• See more in presentations of today..

4
Data acquisition

• Images are converted to binary images using a
  simple threshold value

5
Image analysis
Geometry / Image processing
Segmentation
Thresholding
CT-Image (grey-scale)
Binary voxel representation
Pore map
Vectorisation
Geometrical parameter
Fluid viscosity ? introduced arbitrarily
Computing overall conductivities
Computingconductivities
Graph of the pore network with ks assigned
Overall conductivity
Graph of the pore network
6
Skeleton

• Based on voronoï diagram
• Gives information about local sizes in the pore
  space

7
Segmentation

• Place maximum balls in the pore space
• Make them grow as balloon in tubes

8
Vectorization

• Each pore is represented by its center with its
• Volume
• Aperture
• Connectivity with its neighbors

9
Pore network representation

• A local hydraulic conductivity is associated to
  each pore using Poiseuille law, depending on the
  sizes of pores
• Two sets of pore are selected for input and
  output.

10
Results
Glass laminate 762.2 cm 350300110 voxel
(pixel size 20 ?m)