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Spectral features : How to reduce them

Author: Brug, H. van · Bloemendal, D. ten · Goeij, B. de · Vink, R. · Maresi, L.
Type:article
Date:2009
Institution: TNO Industrie en Techniek
Source:Butler, J.J.Xiong, X.Gu, X., Earth Observing Systems XIV, 3 August 2009 through 5 August 2009, San Diego, CA, 7452
series:
Proceedings of SPIE - The International Society for Optical Engineering
Identifier: 242688
doi: doi:10.1117/12.822957
ISBN: 9780819477422
Article number: 745203
Keywords: Aviation · Diffuser · Optical design · QVD · Remote sensing · SanDiff · Speckles · Spectral features

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. © 2009 SPIE.