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Figure 3
In the calibration procedure, the fringe frequencies of each moiré pattern are extracted via a two-dimensional FFT. The overall variation of the fringe frequency with angular orientation of the gratings with respect to each other allows us to calibrate the grating positions via a minimization procedure. More details can be found in the text.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 24| Part 1| January 2017| Pages 150-162
https://doi.org/10.1107/S1600577516017562
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