Abstract
The choice of waveband for thermal imaging depends not only on the characteristics of the target, background and atmosphere, but on imager parameters such as electron storage capacity per pixel, frame rate, optical transmission, cold-shield efficiency and non-uniformity. This paper outlines the ways in which the conventional trade-offs of sensitivity against waveband and background temperature are modified when electron storage capacity and non-uniformity are taken into account. It is shown that in the presence of these constraints the effects of some equipment parameters such as absorption in hot windows and cold shield inefficiency are significantly exacerbated, and the optimum spectral bandwidths are reduced. The design emphasis is frequently on optimizing image contrast rather than signal level or even photon-limited signal/noise ratio (SNR).
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