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Figure 2
Ratio RC of the diffracted RC divided by transmitted RC. The analyser crystal was positioned at the dashed red line working point on the RC through rotating it about the horizontal axis to achieve an angular shift [\Delta\theta], shown as the red arrow from the Bragg angle [\theta_{\rm{B}}] position, which is placed at the origin. When an object is placed in the path of the wavefield it will cause refraction and attenuation in the wavefield propagated through the object. This changes the incident angle of the wavefield entering the analyser crystal and thus shifts it to a new position on the RC shown as the blue line with an angular shift [\Delta\theta^{\,{\prime}}] shown as the blue double arrow. We can calculate this shift from the change in intensity. These calculations will generate an intensity map and two [\Delta\theta^{\,{\prime}}] maps for every projection, as observed in Fig. 6[link].

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 28| Part 1| January 2021| Pages 283-291
https://doi.org/10.1107/S1600577520013995
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