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Persistent URL http://purl.org/net/epubs/work/34616
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Record Id 34616
Title Phase imaging using time-of-flight neutron diffraction
Abstract A technique that allows the spatial distribution of crystallographic phases in the interior of an object to be reconstructed from neutron time-of-flight (TOF) diffraction is described. To this end, the shift of the Bragg peaks due to the socalled ?geometrical aberration? is exploited. A collimated incident white beam is used to perform a translational or rotational scan of the object whilst collecting a TOF data set for each sample position or orientation. Depending on the location of any scattering material along the line of the incident beam path through the object, the measured d-spacings of the corresponding Bragg peaks are shifted with respect to their nominal values, which are attained only at the geometrical centre of the instrument. Using a formula that is usually employed to correct for sample offset, the phase distribution along the incident beamline can be directly reconstructed, without the need to perform a tomographic reconstruction. Results are shown from a demonstration experiment carried out on a cylindrical Al container enclosing an arrangement of Cu and Fe rods. On the basis of this formalism, an optimized experimental geometry is described and the potential and limits of this technique are explored, as are its applicability to X-ray and constant-wavelength neutron diffraction.
Organisation CCLRC , ISIS , SXD
Keywords Physics , ISIS 2006
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Language English (EN)
Type Details URI(s) Local file(s) Year
Journal Article J Appl Crystallogr 39, no. 1 (2006): 82-89. doi:10.1107/S0021889805041580 2006
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