Recent advances in thermal infrared (TIR) detection offer design options for space sensors requiring temperature sensitivity in the 0.1-0.5 K range. A cost vs. performance trade-off is illustrated with two "reference" sensor concepts. Both systems use all reflective front optics designed for low cost "bolt-together" assembly-alignment. Cooled HgCdTe detection is illustrated by a reference hyperspectral concept using a 320/spl times/210 element cooled focal-plane array (FPA), offering /spl sim/0.15 K noise-equivalent temperature difference (NEDT) at 50 K FPA temperature for 60 meter pixels from a 705 km Earth orbit. Less expensive uncooled 1 /spl mu/m bandwidth multi-spectral imaging is illustrated by a reference concept using silicon microbolometers. Test data from a 320/spl times/240 element microbolometer array suggest 0.2-0.5 K system accuracy. NEDT improvements are expected over the next two years. Improvements in the design of radiative coolers are also expected to lower the cost of cooled TIR sensor systems. A Mars mission imager now under development illustrates application of the uncooled technology to planetary exploration.


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    Title :

    Advanced multispectral TIR remote sensing


    Contributors:


    Publication date :

    1998-01-01


    Size :

    1639711 byte





    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



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