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Visibility simulation of realistic grating interferometers including grating geometries and energy spectra

Harti, Ralph P.; Kottler, Christian; Valsecchi, Jacopo; Jefimovs, Konstantins; Kagias, Matias; Strobl, Markus LU and Grünzweig, Christian (2017) In Optics Express 25(2). p.1019-1029
Abstract

The performance of X-ray and neutron grating interferometers is characterised by their visibility, which is a measure for the maximum achievable contrast. In this study we show how the real grating geometry in a grating interferometer with three gratings impacts the interference and self projection that leads to visibility in the first place. We quantify the individual contributions of wavelength distributions and grating shapes in terms of visibility reduction by determining the absolute as well as relative effect of each contribution. The understanding of the impact of changed geometry and wavelength distributions on the interference of neutrons/X-rays allows us to present the first fully quantitative model of a grating interferometer... (More)

The performance of X-ray and neutron grating interferometers is characterised by their visibility, which is a measure for the maximum achievable contrast. In this study we show how the real grating geometry in a grating interferometer with three gratings impacts the interference and self projection that leads to visibility in the first place. We quantify the individual contributions of wavelength distributions and grating shapes in terms of visibility reduction by determining the absolute as well as relative effect of each contribution. The understanding of the impact of changed geometry and wavelength distributions on the interference of neutrons/X-rays allows us to present the first fully quantitative model of a grating interferometer setup. We demonstrate the capability of the simulation framework by building a model of the neutron grating interferometer at the ICON beamline and directly comparing simulated and measured visibility values. The general nature of the model makes it possible to extend it to any given grating interferometer for both X-rays and neutrons.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Optics Express
volume
25
issue
2
pages
11 pages
publisher
OSA
external identifiers
  • scopus:85010222456
ISSN
1094-4087
DOI
10.1364/OE.25.001019
language
English
LU publication?
yes
id
a1021cdd-81ba-491d-95eb-15f4d586f8da
date added to LUP
2017-03-13 14:23:48
date last changed
2018-03-18 05:10:41
@article{a1021cdd-81ba-491d-95eb-15f4d586f8da,
  abstract     = {<p>The performance of X-ray and neutron grating interferometers is characterised by their visibility, which is a measure for the maximum achievable contrast. In this study we show how the real grating geometry in a grating interferometer with three gratings impacts the interference and self projection that leads to visibility in the first place. We quantify the individual contributions of wavelength distributions and grating shapes in terms of visibility reduction by determining the absolute as well as relative effect of each contribution. The understanding of the impact of changed geometry and wavelength distributions on the interference of neutrons/X-rays allows us to present the first fully quantitative model of a grating interferometer setup. We demonstrate the capability of the simulation framework by building a model of the neutron grating interferometer at the ICON beamline and directly comparing simulated and measured visibility values. The general nature of the model makes it possible to extend it to any given grating interferometer for both X-rays and neutrons.</p>},
  author       = {Harti, Ralph P. and Kottler, Christian and Valsecchi, Jacopo and Jefimovs, Konstantins and Kagias, Matias and Strobl, Markus and Grünzweig, Christian},
  issn         = {1094-4087},
  language     = {eng},
  month        = {01},
  number       = {2},
  pages        = {1019--1029},
  publisher    = {OSA},
  series       = {Optics Express},
  title        = {Visibility simulation of realistic grating interferometers including grating geometries and energy spectra},
  url          = {http://dx.doi.org/10.1364/OE.25.001019},
  volume       = {25},
  year         = {2017},
}