Capsule-like voids in SiC single crystal: Phase contrast imaging and computer simulations

Abstract

The results of observation of capsule-like voids in silicon carbide (6H-SiC) single crystal by means of a phase contrast imaging technique with synchrotron radiation at the Pohang Light Source as well as computer simulations of such images are presented. A pink beam and a monochromated beam were used. The latter gives more pronounced images but they still are smoothed due to a finite detector resolution and the spatial coherence of the beam. Sizes and a structure of far field images are different from these of the objects. The computer simulations allow us to reproduce a shape and a size of the capsule-like void.

Computer simulations of X-ray phase-contrast images and microtomographic observation of tubules in dentin

“…Microporosity within a material can be detected and quantified using in-line imaging techniques (Snigirev et al, 1995;Cloetens et al, 1996). Among the works where in-line images of pores have been investigated with the support of numerical simulations we mention in particular the papers by Agliozzo & Cloetens (2004), Kohn et al (2013), Kohn, Argunova & Je (2014) and Zabler et al (2006). The modeling procedures use standard approximations.…”

Microvoids in Solids: Synchrotron Radiation Phase Contrast Imaging and Simulations

“…Starting with a certain model of an object with several parameters, we determine the real parameters when we arrive at the best match to the experiment. Kohn et al have developed 1D and 2D simulation techniques which have the essential advantage of providing summation over the spectrum. The fitting procedures use standard approximations.…”