Confocal energy-dispersive X-ray diffraction tomography employing a conical shell beam

We introduce a new high-energy X-ray diffraction tomography technique for volumetric materials characterization. In this method, a conical shell beam is raster scanned through the samples. A central aperture optically couples the diffracted flux from the samples onto a pixelated energy-resolving det...

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Bibliographic Details
Published in:Optics express 2019-07, Vol.27 (14), p.19834-19841
Main Authors: Dicken, A J, Evans, J P O, Rogers, K D, Prokopiou, D, Godber, S X, Elarnaut, F, Shevchuk, A, Downes, D, Wilson, M
Format: Article
Language:English
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Summary:We introduce a new high-energy X-ray diffraction tomography technique for volumetric materials characterization. In this method, a conical shell beam is raster scanned through the samples. A central aperture optically couples the diffracted flux from the samples onto a pixelated energy-resolving detector. Snapshot measurements taken during the scan enable the construction of depth-resolved dark-field section images. The calculation of d-spacing values enables the mapping of material phase in a volumetric image. We demonstrate our technique using five ~15 mm thick, axially separated samples placed within a polymer tray of the type used routinely in airport security stations. Our method has broad analytical utility due to scalability in both scan size and X-ray energy. Additional application areas include medical diagnostics, materials science, and process control.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.27.019834