GE Research Presentation

1
Parametric Characterization of PSF of Split-D
Core EC Probes
Shreekanth Mandayam
Department of Electrical Computer
Engineering 201 Mullica Hill Road Glassboro, NJ
08028, USA engineering.rowan.edu
GE John F. Welch Technology Center Bangalore,
India
2
Outline

• Objectives
• Approach
• Parametric PSF Model
• EC Signature Deconvolution
• Pre-Restoration Filtering
• Results
• Simulated Image Template
• SC EC Images
• Summary

3
Objectives

• To design and develop a numerical parametric
  model for multiple EC probe PSFs
• To validate parametric PSF model by deconvolution
  of EC signatures for flaw characterization

4
Experimental Data (GEMTC)

• SGE638 and SGE596 split-D core EC probes
• EC-2000 system at 6-MHz
• Copper wire (200-mils diameter) tip sharpened to
  3-mil diameter embedded in 1 thick hard
  polystyrene foam.
• Ferrous tip
• 500 x 500 TIFF files with a pixel resolution of
  1-mil x 1-mil

5
Experimental Data (GEMTC)

Cu Tip Fe Tip
SGE638
6
Parametric PSF Model (1-DOF)

7
Parametric PSF Model (2-DOF)


8
Parametric PSF Model (2-DOF)
9
SGE638
10
SGE638
11
SGE596
12
SGE596
13
EC Signature Deconvolution
14
Deconvolution Methods
15
Simulated Image Template Effect of Anisotropic
PSF
d(x,y) p(x,y)
s(x,y)
Wiener Lucy-Rich.
16
Simulated Image Template Effect of Isotropic PSF
d(x,y) p(x,y)
s(x,y)
Wiener Lucy-Rich.
17
Pre-Restoration Filter
18
Results Simulated Image
19
Simulated Image Experimental PSF
s(x,y) p(x,y)
f(x,y) h(x,y)
L-C Restored
20
SC-EC Images on Databaseiimlgeaenge on
'bng1nas02.jfwtc.ge.com
DA718_H01_163S/DA718_H01_163S.S.1.030504.1459
Original Restored
21
SC-EC Images on Databaseiimlgeaenge on
'bng1nas02.jfwtc.ge.com
DA718_H01_163S/DA718_H01_163S.S.2.030504.1459
Original Restored
22
Summary

• Parametric model for PSF of split-D core EC Probe
• Deconvolution algorithm to compensate for
  anisotropic probe PSF