Open AccessPredicting visibility of interference fringes in X-ray grating interferometry
Author(s) -
Aimin Yan,
Xizeng Wu,
Hong Liu
Publication year - 2016
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.015927
Subject(s) - optics , visibility , astronomical interferometer , interferometry , interference (communication) , physics , grating , talbot effect , interferometric visibility , coherence (philosophical gambling strategy) , fourier transform , detector , computer science , telecommunications , channel (broadcasting) , quantum mechanics
The interference fringe visibility is a common figure of merit in designs of x-ray grating-based interferometers. Presently one has to resort to laborious computer simulations to predict fringe visibility values of interferometers with polychromatic x-ray sources. Expanding the authors' previous work on Fourier expansion of the intensity fringe pattern, in this work the authors developed a general quantitative theory to predict the intensity fringe pattern in closed-form formulas, which incorporates the effects of partial spatial coherence, spectral average and detector pixel re-binning. These formulas can be used to predict the fringe visibility of a Talbot-Lau interferometer with any geometry configuration and any source spectrum.