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Proceedings Paper

Spectral features: how to reduce them
Author(s): Hedser van Brug; Daniel ten Bloemendal; Bryan de Goeij; Ramon Vink; Luca Maresi
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Paper Abstract

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.

Paper Details

Date Published: 21 August 2009
PDF: 8 pages
Proc. SPIE 7452, Earth Observing Systems XIV, 745203 (21 August 2009); doi: 10.1117/12.822957
Show Author Affiliations
Hedser van Brug, TNO Science and Industry (Netherlands)
Daniel ten Bloemendal, TNO Science and Industry (Netherlands)
Bryan de Goeij, TNO Science and Industry (Netherlands)
Ramon Vink, ESA ESTEC (Netherlands)
Luca Maresi, ESA ESTEC (Netherlands)


Published in SPIE Proceedings Vol. 7452:
Earth Observing Systems XIV
James J. Butler; Xiaoxiong Xiong; Xingfa Gu, Editor(s)

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