Mapping misoriented fibers using X-ray dark field tomography |
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Authors: | Torsten Lauridsen Erik M Lauridsen Robert Feidenhans’l |
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Institution: | 1. Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark 2. Department of Energy Conversion and Storage, Technical University of Denmark, Kongens Lyngby, Denmark
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Abstract: | X-ray grating interferometers produce three distinct signals; an absorption signal, a differential phase signal and a dark field signal. Until now a method for successfully creating dark field tomograms of nonisotropic samples has not been demonstrated. In this paper we test a method for creating such tomograms on a highly nonisotropic sample, i.e. a five layer “sandwich” of oriented carbon fibers. The fibers are parallel within the individual sandwich layers, but perpendicular to the fibers in the adjacent layers. We show that by choosing a rotation axis parallel to the grating stepping direction (i.e. a horizontal rotation axis in most setup configurations) it is possible to produce a darkfield tomogram where fibers parallel to the probed scattering direction appear to have no dark field signal. The method produces a tomogram in the form of a scalar field of dark field scattering values. |
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