Projection angle dependence in grating-based X-ray dark-field imaging of ordered structures
Florian Bayer,Simon Zabler,Christian Brendel,Georg Pelzer,Jens Rieger,André Ritter,Thomas Weber,Thilo Michel,Gisela Anton +8 more
TLDR
This contribution attempts to extend existing models for 2D projections to 3D data by analyzing dark-field contrast tomography of anisotropically structured materials such as carbon fiber reinforced carbon (CFRC).Abstract:
Over the recent years X-ray differential phase-contrast imaging was developed for the hard X-ray regime as produced from laboratory X-ray sources. The technique uses a grating-based Talbot-Lau interferometer and was shown to yield image contrast gain, which makes it very interesting to the fields of medical imaging and non-destructive testing, respectively. In addition to X-ray attenuation contrast, the differential phase-contrast and dark-field images provide different structural information about a specimen. For the dark-field even at length scales much smaller than the spatial resolution of the imaging system. Physical interpretation of the dark-field information as present in radiographic and tomographic (CT) images requires a detailed look onto the geometric orientation between specimen and the setup. During phase-stepping the drop in intensity modulation, due to local scattering effects within the specimen is reproduced in the dark-field signal. This signal shows strong dependencies on micro-porosity and micro-fibers if these are numerous enough in the object. Since a grating-interferometer using a common unidirectional line grating is sensitive to X-ray scattering in one plane only, the dark-field image is influenced by the fiber orientations with respect to the grating bars, which can be exploited to obtain anisotropic structural information. With this contribution, we attempt to extend existing models for 2D projections to 3D data by analyzing dark-field contrast tomography of anisotropically structured materials such as carbon fiber reinforced carbon (CFRC).read more
Citations
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Journal ArticleDOI
Non-destructive characterisation of out-of-plane fibre waviness in carbon fibre reinforced polymers by X-ray dark-field radiography
TL;DR: In this article , a method for the detection and quantification of out-of-plane fiber waviness in carbon fiber composites using Talbot-Lau grating interferometry was proposed.
Journal ArticleDOI
Review and experimental verification of X-ray darkfield signal interpretations with respect to quantitative isotropic and anisotropic darkfield computed tomography
TL;DR: The Yashiro-Lynch model is experimentally verified both in radiographic and tomographic imaging in a monochromatic synchrotron setting, considering both the effects of material and positional dependence of the resulting dark-field contrast.
Proceedings ArticleDOI
Moiré artefact reduction in Talbot-Lau X-ray imaging
Christian Hauke,Martino Leghissa,Thomas Mertelmeier,Marcus Radicke,Sven-Martin Sutter,Tom Weber,Gisela Anton,Ludwig Ritschl +7 more
TL;DR: An advanced reconstruction algorithm is developed, which reduces moiré artefacts in the reconstructed images by compensating these inaccuracies during the measurement process by adjusting the phase-step positions.
Advanced X-ray Detectors for Industrial and Environmental Applications
TL;DR: The new generation of X-ray free electron laser sources are capable of producing light beams with billion times higher peak brilliance than that of the best conventional X-Ray sources as mentioned in this paper.
Workflows For X-ray And Neutron Interferometry/Tomography As Applied To Additive Manufacturing
TL;DR: In this article, the authors present a survey of the most relevant information in the literature:...,..... The following are the main points of interest:
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