Abstract
Extensive studies on the photometric characteristics and the imaging capability of image dissector tubes, operated under a photon counting scheme in low light level image observation have been carried out. Anode pulse height distribution of the circular aperture (50 µm in diameter) type particularly, shows good agreement with Poisson statistics; its photon counting response as well as its signal-to-noise ratio is considerably better than that of the bigger aperture such the 200×1000 µm2 rectangular type. The spatial resolution is alterable by varying the sampling pixel density. It is, however, limited physically by the size and shape of the aperture. Patterns of various structures have been used in intensity resolution study. Luminous pattern in dark background is likely to give higher intensity resolution than that of dark pattern in luminous background. In general, both the spatial and intensity resolving power of the circular type (tiny aperture) are found to be practically appreciable.
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