Journal
OPTICS EXPRESS
Volume 28, Issue 7, Pages 9786-9801Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.381759
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Funding
- National Natural Science Foundation of China [11804356, 11535015, 11674232, 61671311]
- Chinese Academy of Sciences Key Laboratory of Health Informatics [2011DP173015]
- National Key Research and Development Program of China [2016YFA0400900]
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In this work, we developed a new theoretical framework using wave optics to explain the working mechanism of the grating based X-ray differential phase contrast imaging (XPCI) interferometer systems consist of more than one phase grating. Under the optical reversibility principle, the wave optics interpretation was simplified into the geometrical optics interpretation, in which the phase grating was treated as a thin lens. Moreover, it was derived that the period of an arrayed source, e.g., the period of a source grating, is always equal to the period of the diffraction fringe formed on the source plane. When a source grating is utilized, the theory indicated that it is better to keep the periods of the two phase gratings different to generate large period diffraction fringes. Experiments were performed to validate these theoretical findings. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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