Title of article :
Characterization of detector modulation-transfer function with noise, edge, and holographic methods
Author/Authors :
McLeod، نويسنده , , Robert A. and Malac، نويسنده , , Marek، نويسنده ,
Pages :
11
From page :
42
To page :
52
Abstract :
We developed a new method for characterization of detector performance used in the transmission electron microscope (TEM) based on the measured contrast of holographic fringes. The new method changes spatial frequency of the measured holographic fringes, generated by an electrostatic biprism and Schottky or cold field-emission gun, to sample the modulation-transfer function (MTF) of the detector. The MTF of a Gatan Ultrascan™ 1000 charged-coupled detector (CCD) is evaluated using the new method and the results are compared to the established noise and slanted-edge method results. Requirements for accuracy of the edge and noise MTF methods are discussed. We consider issues surrounding incomplete read-out and how it affects the gain reference normalization of the detector. We evaluate how the MTF affects optimization of experimental parameters in the TEM.
Keywords :
Slow-scan CCD detector , CCD camera , Electron detection , scintillator , Point spread function (PSF) , modulation transfer function (MTF) , Noise transfer function (NTF) , Noise power spectrum (NPS) , Incomplete read-out , Detector noise , Detector quantum efficiency (DQE)
Journal title :
Astroparticle Physics
Record number :
2043955
Link To Document :
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