Annular beam X-ray imaging

This thesis presents an investigation of depth‐resolved absorption imaging by scanning objects through an annular beam of X‐rays. The resultant ring shaped projections record depth dependent parallax. The study focuses on two different scanning methods. First, a single axis scan has been employed to record curvilinear stereoscopic images. Second, a two axis raster scanning approach enables focal plane images to be produced via tomosynthesis. These novel absorption contrast methods have been carefully designed to complement X-ray diffraction considerations. Prior work employing an annular beam concerned the collection of X­ray diffraction data for structural analysis/phase identification. This method, termed Focal Construct Geometry (FCG), provided orders of magnitude increase in the intensity of the diffracted X-rays within the beam’s dark interior to enable rapid processing. However, this work relied upon a priori sample position. The research presented in this thesis establishes a complementary absorption imaging modality, which is designed to support and inform the analysis of the diffraction data by providing quantitative spatial information.

Name dc:type.qualificationname

phd

Level dc:type.qualificationlevel

doctoral

Grantor dc:publisher.institution

Nottingham Trent University

Year dc:date.issued

2014

Author dc:creator

• Godber, SX