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Spectral features are introduced by the diffuser that is used during on-board sun calibration. New findings are presented
on how to reduce the size of these spectral features. Reduction can be obtained via optical design of the calibration unit,
but also in creating a better diffuser. A novel diffuser design will be presented and its performance will be compared to
standard diffusers like an Aluminum diffuser, a Spectralon diffuser, and the QVD (Quasi Volume Diffuser). For the in-house
spectral features testing setup an improvement of about a factor of eight was obtained for the new diffuser type
when compared to QVD. QVD in its turn is already better than an Aluminum diffuser by a factor of ten. Spectralon and
QVD are found to be about equally good when measured in terms of spectral features reduction. The novel diffuser is
referred to as SanDiff since it is a sandwich of QVD and PTFE material. For the SanDiff also the BSDF was measured
and will be presented here.
Hedser van Brug,Daniel ten Bloemendal,Bryan de Goeij,Ramon Vink, andLuca Maresi
"Spectral features: how to reduce them", Proc. SPIE 7452, Earth Observing Systems XIV, 745203 (21 August 2009); https://doi.org/10.1117/12.822957
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Hedser van Brug, Daniel ten Bloemendal, Bryan de Goeij, Ramon Vink, Luca Maresi, "Spectral features: how to reduce them," Proc. SPIE 7452, Earth Observing Systems XIV, 745203 (21 August 2009); https://doi.org/10.1117/12.822957