Open AccessInterferogram conditioning for improved Fourier analysis and application to X-ray phase imaging by grating interferometry
Author(s) -
Antoine Montaux-Lambert,
Pascal Mercère,
Jérôme Primot
Publication year - 2015
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.23.028479
Subject(s) - optics , fourier transform , phase retrieval , interferometry , interference (communication) , grating , computer science , phase (matter) , astronomical interferometer , visibility , spatial frequency , physics , algorithm , computer network , channel (broadcasting) , quantum mechanics
An interferogram conditioning procedure, for subsequent phase retrieval by Fourier demodulation, is presented here as a fast iterative approach aiming at fulfilling the classical boundary conditions imposed by Fourier transform techniques. Interference fringe patterns with typical edge discontinuities were simulated in order to reveal the edge artifacts that classically appear in traditional Fourier analysis, and were consecutively used to demonstrate the correction efficiency of the proposed conditioning technique. Optimization of the algorithm parameters is also presented and discussed. Finally, the procedure was applied to grating-based interferometric measurements performed in the hard X-ray regime. The proposed algorithm enables nearly edge-artifact-free retrieval of the phase derivatives. A similar enhancement of the retrieved absorption and fringe visibility images is also achieved.