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Figure 11
X-ray intensity images recorded by the pixel-array detector (pixel size of 55 µm) (a) without any sample, essentially a flatfield, denoted as I0, and (b) with a nickel-foil sample, denoted as IS. The images shown here are cropped from the full 500 × 500 pixel field-of-view of the detector for better visualization. (c) The corresponding absorption image, denoted as μT, calculated pixel-wise by Lambert–Beer's law. A median filter with a kernel size of 5 was applied to remove impulse noise. (d) Generated XANES spectrum as a function of pixel number from the absorption image. (e) A `standard' spectrum measured at a scanning DCM-based beamline (APS 20-BM) with the energy axis calibrated. In (d) and (e) several corresponding feature points are selected, which are used for energy calibration of the DXAS spectrum. A polynomial fit using the feature points yields an energy calibration function. (f) The final DXAS spectrum after application of the energy calibration function and the standard DCM spectrum.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 32| Part 4| July 2025| Pages 1068-1084
https://doi.org/10.1107/S1600577525004953
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