Spatially resolved diffraction using a Soller Collimator–Imaging plate assembly

Abstract

A series of multiple foil collimators have been constructed to perform spatially resolved diffraction using a synchrotron radiation X-ray source and a two-dimensional X-ray detector. Slit gap sizes of 0.75, 0.25 and 0.125 mm were evaluated. A thin vanadium foil (BCC) on bulk titanium (HCP) was studied as a test system. This system simulates an α-Ti (HCP)→β-Ti (BCC) transformation in the heat affected zone of Ti fusion welds. Diffraction lines from both V(2 0 0) and Ti(1 0 2) were measured in the gap aligned with the V/Ti boundary. With improvements in the mounting of the slits, a spatial resolution of at least 0.12 mm will be possible.