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Figure 3
Centre position of the image as recorded for different settings of the vertical translation stage (lower panel). The solid line is a linear fit to the data. The upper panel shows the deviations between the measurements and the best-fit curve in pixel units. The centre position of the beam was determined by fitting of a Gaussian curve to the summed rows and columns of the CMOS image sensor using the Levenberg–Marquardt method. The error bar on the data points is smaller than the markers and is derived from the R2 coefficient of determination in the fitting process (Press et al., 2007BB16). From this scan and the physical camera pixel size of 7 µm × 7 µm, a calibration of 3.57 µm pixel−1 is found. The integral non-linearity is 2.1% over a 1 mm range.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 27| Part 1| January 2020| Pages 37-43
https://doi.org/10.1107/S1600577519015340
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