Abstract
Previous analyses of the SPRITE detector signal-to-noise performance have ignored the effect of the increasing carrier density along the filament due to integration of the background flux and have consequently assumed the recombination probability of excess carriers, the electric field and the ambipolar velocity all to be constant. In this paper a more exact analysis is presented, and it is shown that with the lower carrier density and longer lifetime cadmium-mereury-telluride now becoming available, significant benefits in detectivity can be obtained by correct choice of the device geometry. Expressions are given from which the optimum length and taper functions can be determined for different system scan speeds and optical apertures. It is shown that anamorphic optics can increase the achievable detectivity in addition to improving the modulation transfer function.
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