Phase-contrast x-ray imaging for nondestructive evaluation of materials

Journal Article · Sat Jul 01 04:00:00 EDT 2006 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.2209889· OSTI ID:20879964

Zoofan, B; Kim, J -Y; Rokhlin, S I; Frankel, G S ^[1]

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1. Nondestructive Evaluation Program, Edison Joining Technology Center, Ohio State University, Columbus, Ohio 43221 (United States)

Phase-contrast x-ray imaging has been studied intensively in the past, mainly with applications to low density biological materials. In this work experimental and theoretical aspects of phase-contrast microfocus x-ray imaging of structural materials (metals and polymers) are considered. The diffraction field in an object from a point x-ray source is simulated and the effects of geometrical and material parameters on the x-ray phase-contrast image are obtained. It is shown that higher-order terms should be retained in the asymptotic expansion of the Green function in the image plane to accurately image discontinuities in structural materials. Experimental phase-contrast images of small defects are obtained with a 5 {mu}m microfocal x-ray source and compared with those from computer simulation as a function of geometrical magnification and photon energy. The phase-contrast x-ray imaging provides enhanced image contrast and improved edge definition and is important for further development of nondestructive evaluation of structural materials.

• OSTI ID: 20879964
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 1 Vol. 100; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BIOLOGICAL MATERIALS
BUILDING MATERIALS
COMPUTERIZED SIMULATION
DEFECTS
DENSITY
DIFFRACTION
IMAGES
METALS
NONDESTRUCTIVE ANALYSIS
NONDESTRUCTIVE TESTING
PHOTONS
POLYMERS
X RADIATION
X-RAY SOURCES