 | Acta Crystallographica Section A Acta Crystallographica Section A FOUNDATIONS AND ADVANCES |
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![[Figure 1]](mq5031fig1mag.jpg)
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Figure 1
After interacting with the sample the beam (amber rays) passes through the objective lens, which forms a diffraction pattern at the cross-section plane and an image of the sample at the image plane. Only the diffraction pattern corresponding to the image of the crystal within the selected area aperture will be visible. Several rays are omitted in these simplified illustrations and the size of the image plane is exaggerated for clarity. The scattering angle (2θ) is indicated. (a) In bright field, the image of the crystal is magnified onto the detector (yellow rays). (b) In diffraction mode, the diffraction lens is positioned to form a magnified image of the diffraction pattern (green rays) on the detector. The objective aperture at the cross-section plane is fully open. (c) Owing to the magnification of the lenses, the distance d from the sample to the physical detector is typically much smaller than the distance D to the virtual detector. The distance to the virtual detector corresponds to the sample–detector distance in a lensless measurement using e.g. X-rays. |
![[Figure 1]](mq5031fig1.jpg)
| FOUNDATIONS ADVANCES |
ISSN: 2053-2733
