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The point-spread function of fiber-coupled area detectors.

Holton, James M; Nielsen, Chris; Frankel, Kenneth A.
J Synchrotron Radiat; 19(Pt 6): 1006-11, 2012 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-23093762
The point-spread function (PSF) of a fiber-optic taper-coupled CCD area detector was measured over five decades of intensity using a 20 µm X-ray beam and ~2000-fold averaging. The `tails' of the PSF clearly revealed that it is neither Gaussian nor Lorentzian, but instead resembles the solid angle subtended by a pixel at a point source of light held a small distance (~27 µm) above the pixel plane. This converges to an inverse cube law far from the beam impact point. Further analysis revealed that the tails are dominated by the fiber-optic taper, with negligible contribution from the phosphor, suggesting that the PSF of all fiber-coupled CCD-type detectors is best described as a Moffat function.