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Figure 4
Geometry conventions used in xrdPlanner. Translations without any tilt/rotation are the horizontal and vertical distances between the centre of the detector and the PONI (top). The SDD is the distance from the sample to the PONI. A rotation moves the detector along the goniometer circle (constant SDD), keeping the PONI at the same position relative to the detector surface, here the detector centre (lower left). A tilt rolls the detector surface on the goniometer circle, hence the SDD is fixed, but the PONI shifts along the detector face (lower right).

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 31| Part 2| March 2024| Pages 394-398
https://doi.org/10.1107/S1600577523011086
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