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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    Titel :

    Advanced multispectral TIR remote sensing


    Beteiligte:
    Schueler, C.F. (Autor:in) / Blasius, K.R. (Autor:in) / Silverman, S.H. (Autor:in)


    Erscheinungsdatum :

    01.01.1998


    Format / Umfang :

    1639711 byte





    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



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