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Figure 2
Sketch of fiber diffraction geometry with the Ewald sphere and a Polanyi sphere. The intersection is a circle (`reflection circle') that does not change as the fiber is tilted (tilt angle [\beta]). The radius of the Polanyi sphere is chosen to match the magnitude sr of a model ideal reflection manifested in two rings [(s_{\rm 12r},\pm s_{\rm 3r})]. The trihedron (s1,s2,s3) indicates reciprocal space. R is the distance between fiber and detector. ( p1,p3) indicates the detector coordinate system.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 42| Part 2| February 2009| Pages 295-301
doi:10.1107/S0021889809004713
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