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Spectral features effect on reference diffusers: diffuser trade-off study
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Paper Abstract

For the accurate radiometric calibration of earth observation instruments, diffusers are used as "white-references". In the framework of on-ground calibration campaigns of instruments such as SCIAMACHY, GOME2, OMI (all using on-board diffusers), which took place at TNO, a modulation of the reflectance signal in the spectral domain was discovered. The position and amplitude of the modulation depend on various factors: the diffuser material, the illumination and detection angles, the detection bandwidth, the wavelength, the used area of the diffuser and the way the diffuser is implemented in the optical design of the instrument (e.g. mesh, moving diffuser, ...). This modulation has been called Spectral Features. To achieve an accurate characterization of this effect TNO developed a dedicated Spectral Features set-up that allows the correlation of the Spectral Features sensitive parameters in order to minimize their effect. This paper gives an overview of the results of the commissioning activity of the dedicated Spectral Features set-up in the UV/VIS and of its extension to the NIR spectral range. Furthermore the results of the diffuser trade-off study performed in the framework of the ESA study (contract number 18432/04/NL/AR) are presented in this paper.

Paper Details

Date Published: 21 October 2005
PDF: 11 pages
Proc. SPIE 5978, Sensors, Systems, and Next-Generation Satellites IX, 59780Y (21 October 2005); doi: 10.1117/12.628965
Show Author Affiliations
Grégory Bazalgette Courrèges Lacoste, TNO Science and Industry (Netherlands)
Hedser van Brug, TNO Science and Industry (Netherlands)
Jos Groote Schaarsberg, TNO Science and Industry (Netherlands)
Gerard Otter, TNO Science and Industry (Netherlands)
Umberto del Bello, ESA/ESTEC (Netherlands)

Published in SPIE Proceedings Vol. 5978:
Sensors, Systems, and Next-Generation Satellites IX
Roland Meynart; Steven P. Neeck; Haruhisa Shimoda, Editor(s)

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