Abstract

The electron microscope is becoming a link in a highly sophisticated data processing system. The acquisition of image data supplied as a spatial distribution of current density requires a position sensitive electron detector which converts the current into digital information to be processed by image storages and computers to retrieve the information in which the user is interested. The ultimate goal of this interface is a lossless conversion with respect to both the number of pixels and the detection quantum efficiency (DQE) as well as high speed, minimum distortion, and linearity. I shall try to outline the present state of image read-out using both the conventional photoplate with spatial digitizing equipment and conventional TV sets. Subsequently it will be discussed how the future CCD technology (charge coupled device) may overcome some restrictions of present solutions.Every spatial recording device combines a conversion with a storage function in order to build up a signal-to-noise ratio (SNR) sufficient for detection. The following characteristics describe their performance:

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