We report a new methodology for the precise estimation of radial gap from radiography images using image sharpening tools. The image sharpening is done by differentiation of pixels over a region, using a gradient approach. The gradient approach assumes relatively large gradient values
for prominent edges in an image, small values for smooth regions and zero for regions that have constant grey values. Applying a first-order derivative to an image demarcates the boundaries and enhances the visibility of small steps and other finer details. This new approach facilitates enhanced
detectability of radial gaps. Using this approach, radial gaps of 100 microns and above have been measured, which was not possible without employing image enhancement tools. The procedure has been successfully applied to the estimation of pellet-to-clad gap and pellet-to-pellet axial gap in
mixed uranium-plutonium oxide ((U, Pu) O2) fuel pins. The minimum radial gap (pellet-to-clad gap) measured using this approach is 64 microns. It has been found that the image processing tools can substantially reduce the unsharpness of the image due to scattering components and
detector characteristics. This methodology is considered to be useful for the estimation of internal dimensions with better accuracy in assembled components using X-ray radiography images.
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Document Type: Research Article
1 Distinguished Scientist and Director of Indira Gandhi Centre for Atomic Research, Kalpakkam. He is a Hon Member of ICNDT, Hon Fellow of the Indian Society for NDT, Hon Fellow of The British Institute of NDT and Founder Member of the Board of
Directors, World Federation of NDE Centres, USA.
Publication date: December 1, 2007
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