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27 January 1997 PRISM on-board characterization
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Abstract
PRISM is a future spaceborne hyperspectral imager, to operate in the spectral range from 450 nm to 12.3 micrometers . The PRISM instrument designer faces a challenging requirement - the absolute radiometric accuracy of the instrument in the range from 450 nm to 2350 nm shall be better than 2 percent of the measured radiance. This requirement can only be met using highly accurate characterization sources and a thermally stable instrument. In the DSS PRISM concept a calibration module is located separate from the optical module on an adjacent platform panel. The characterization sources are accessed via a pointing mirror, which is protruding over the platform edge. THis configuration allows for a wide across track coverage and access to the three on- board characterization units and to cold space. The three on-board characterization units are an aperture plate with small hole apertures for direct sun viewing, a reflective diffuser and a blackbody with selectable heater levels. Laser sources illuminating the diffuser serve as spectral references. The high accuracy in the VNIR/SWIR range is achieved by subsequent characterization measurements using the aperture plate and the diffuser: the first serves as absolute radiation reference for a limited amount of pixels, whereas the later will provide uniform illumination of all pixels and thus allows to correlate the sensitivities of the absolutely measured pixels to the others.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Winfried Posselt, Daniel R. Lobb, Philip N. Slater, Umberto Del Bello, and Roland Meynart "PRISM on-board characterization", Proc. SPIE 2957, Advanced and Next-Generation Satellites II, (27 January 1997); https://doi.org/10.1117/12.265442
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