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

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Dicken, A.J., Evans, J.P.O. ORCID: 0000-0001-9831-1461, Rogers, K.D., Prokopiou, D., Godber, S.X., Elarnaut, F. ORCID: 0000-0003-0189-6665, Shevchuk, A., Downes, D. ORCID: 0000-0002-4886-5260 and Wilson, M., 2019. Confocal energy-dispersive X-ray diffraction tomography employing a conical shell beam. Optics Express, 27 (14), pp. 19834-19841. ISSN 1094-4087

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Official URL: http://doi.org/10.1364/oe.27.019834

Abstract

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.

Item Type:

Journal article

Publication Title:

Optics Express

Creators:

Dicken, A.J., Evans, J.P.O., Rogers, K.D., Prokopiou, D., Godber, S.X., Elarnaut, F., Shevchuk, A., Downes, D. and Wilson, M.

Publisher:

The Optical Society of America

Date:

2019

Volume:

Number: