On the analysis of time-of-flight spin-echo modulated dark-field imaging data

International Conference on Polarised Neutrons for Condensed Matter Investigations

Sales, Morten^1,2 ; Plomp, Jeroen^3 ; Bouwman, Wim G.^3 ; Tremsin, Anton S.^4 ; Habicht, Klaus^5 ; Strobl, Markus^1,6

Nano-Science Center, Niels Bohr Institute, University of Copenhagen, Copenhagen

DK-2100, Denmark^1

Department of Physics, Technical University of Denmark, Kgs. Lyngby

DK-2800, Denmark^2

Faculty of Applied Sciences, Delft University of Technology, Delft

2629 JB, Netherlands^3

University of California at Berkeley, Space Sciences Laboratory, Berkeley

CA

94720, United States^4

Helmholtz-Zentrum Berlin fuer Materialen und Energie GmbH, Berlin

D-14109, Germany^5

European Spallation Source ESS-AB, Science Division, Lund

SE-22100, Sweden^6

关键词: Dark field imaging;    Information contents;    Modulation period;    Neutron imaging;    Scattering information;    Small angle scattering;    Spatial resolution;    Spatially resolved;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/862/1/012026/pdf
DOI  :  10.1088/1742-6596/862/1/012026

来源: IOP

【 摘 要 】

Spin-Echo Modulated Small Angle Neutron Scattering with spatial resolution, i.e. quantitative Spin-Echo Dark Field Imaging, is an emerging technique coupling neutron imaging with spatially resolved quantitative small angle scattering information. However, the currently achieved relatively large modulation periods of the order of millimeters are superimposed to the images of the samples. So far this required an independent reduction and analyses of the image and scattering information encoded in the measured data and is involving extensive curve fitting routines. Apart from requiring a priori decisions potentially limiting the information content that is extractable also a straightforward judgment of the data quality and information content is hindered. In contrast we propose a significantly simplified routine directly applied to the measured data, which does not only allow an immediate first assessment of data quality and delaying decisions on potentially information content limiting further reduction steps to a later and better informed state, but also, as results suggest, generally better analyses. In addition the method enables to drop the spatial resolution detector requirement for non-spatially resolved Spin-Echo Modulated Small Angle Neutron Scattering.