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A new linear transfer theory and characterization method for image detectors. Part II: experiment
Axel Lubk1, Falk Röder, Tore Niermann
1CEMES-CNRS 29, rue Jeanne Marvig B.P. 94347 F-31055 Toulouse Cedex, France. Axel.Lubk@triebenberg.de
Abstract:
A novel generalized linear transfer theory describing the signal and noise transfer in image detectors has been developed in Part I (Niermann, this issue, [1]) of this paper. Similar to the existing notion of a point spread function (PSF) describing the transfer of the first statistical moment (the average), a noise spread function (NSF) was introduced to characterize the spatially resolved transfer of noise (central second moment, covariance). Following the theoretic results developed in Part I (Niermann, this issue, [1]), a new experimental method based on single spot illumination has been developed and applied to measure 2D point and 4D noise spread functions of CCD cameras used in TEM. A dedicated oversampling method has been used to suppress aliasing in the measured quantities. We analyze the 4D noise spread with respect to electronic and photonic noise contributions.
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