期刊
JOURNAL OF APPLIED CRYSTALLOGRAPHY
卷 43, 期 -, 页码 1356-1371出版社
INT UNION CRYSTALLOGRAPHY
DOI: 10.1107/S0021889810033418
关键词
error estimation; CCD area detectors; detector simulation; pixel correlation
Current methods for diffraction-spot integration from CCD area detectors typically underestimate the errors in the measured intensities. In an attempt to understand fully and identify correctly the sources of all contributions to these errors, a simulation of a CCD-based area-detector module has been produced to address the problem of correct handling of data from such detectors. Using this simulation, it has been shown how, and by how much, measurement errors are underestimated. A model of the detector statistics is presented and an adapted summation integration routine that takes this into account is shown to result in more realistic error estimates. In addition, the effect of correlations between pixels on two-dimensional profile fitting is demonstrated and the problems surrounding improvements to profile-fitting algorithms are discussed. In practice, this requires knowledge of the expected correlation between pixels in the image.
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