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21 October 2005 Spectral features effect on reference diffusers: diffuser trade-off study
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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.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Grégory Bazalgette Courrèges Lacoste, Hedser van Brug, Jos Groote Schaarsberg, Gerard Otter, and Umberto del Bello "Spectral features effect on reference diffusers: diffuser trade-off study", Proc. SPIE 5978, Sensors, Systems, and Next-Generation Satellites IX, 59780Y (21 October 2005);


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