Figure 2
From: General solution for quantitative dark-field contrast imaging with grating interferometers
Illustration of the modulation term and the basic cosine relations by an undisturbed modulation term of the instrument response function like in an ideal empty beam measurement (blue line), a modulation term according to equ. (7) like assuming scattering causing a phase shift Δω of +/- π/5 (orange line) coinciding with the sum (dots) of half “intensity” modulations shifted in phase to π/5 and -π/5 like illustrated by gray dashed lines.
