Concept for a Space-Based Transfer Standard Spectroradiometer (SCATS)

Details Concept for a Space-Based Transfer Standard Spectroradiometer (SCATS) Concept for a Space-Based Transfer Standard Spectroradiometer (SCATS)

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmgc23a0764h&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #GC23A-0764

Physics

3300 Atmospheric Processes, 3394 Instruments And Techniques

Scientific paper

Future Earth science missions will require instrument calibration traceable to SI units and stable to 0.5% over 10 year operational lifetimes. A strategy consistent with those objectives is the direct measurement of the Earth radiance, solar irradiance, and lunar irradiance through a scanning un-obstructed collector; the Earth albedo follows directly. We describe a Space-based Transfer Standard Spectroradiometer (SCATS) that directly transfers the solar (or lunar) disc spectral irradiance to measurements of the Earth's disc spectral radiance. SCATS is a low cost, compact, light weight instrument capable of accurate ratio measurements that are temporally invariant over measurement time scales. SCATS provides albedo measurements in the solar reflective region and thermal emission bands of the Earth and its atmosphere relative to the solar irradiance. We expect the SCATS calibration to be stable to 0.1% being tied to solar irradiance. This SI traceable concept eliminates the long term stability concerns associated with solar diffusers. SCATS is a simple geometrically baffled spectroradiometer calibrated against NIST radiometric standards on the ground for spectral radiance and irradiance measurements. The instrument consists of multiple detectors utilizing radiometrically stable narrow band interference filters: 300 nm to 15 um in 19 simultaneously measured channels. Thermally, the sun is used as a blackbody calibration source for the earth radiance. Un-cooled Si photodiodes measure in the solar reflective band, and thermoelectrically cooled InGaAs photodiodes, and high sensitivity thermopiles are used in the thermal infrared. An orthogonal 2-mirror system eliminates polarization effects and allows viewing the Sun, Earth, Moon, or space from GEO or LEO. This report details the concept, provides a status, and describes future directions for our laboratory demonstration.

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