Operating infrared detectors at cryogenic temperatures is vital for attenuating intrinsic thermally-induced noise, thus enabling long working ranges, short integration times, high spatial and temperature resolutions along with other advantages.
Unfortunately, the high costs of integrated dewar/detector/cooler assemblies prevent the broad deployment of cooled infrared technology in the price-sensitive and highly competitive commercial market. Uncooled infrared technology, although inferior in performance, is more affordable and, therefore, more ubiquitous.
Extending working ranges of uncooled infrared detectors, however, may lead to using expensive and bulky “fast” optics. In a combination with added cost, weight and mechanical complexity of host structures, this may wipe out inherent cost/bulk advantages of uncooled imagers. In some cases, therefore, the cooled infrared imager may be superior in terms of attainable performance, bulk, and system cost.
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