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Proceedings Paper

High rejection VNIR-SWIR beam splitter for the multispectral instrument of Sentinel 2
Author(s): V. Moreau; M. Lappschies; F. Camus; V. Kirschner; C. Haas
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Paper Abstract

The Sentinel 2 mission shall ensure the continuity and enhancement of Landsat and SPOT data and sustain operational land services in the frame of the Global Monitoring for Environment and Security (GMES) initiative. Sentinel-2 is designed to image the Earth’s landmasses from its orbit for at least 7.25 years. The Multi-Spectral Instrument (MSI), delivered by Astrium Toulouse, will provide high resolution imagery in 13 spectral channels extending from the Visible Near Infrared (VNIR, 400-1100 nm) to the Short Wave Infra-Red (SWIR, 1100-2500 nm) range, down to a resolution of 10 meters with an image width of 290 kilometers. A dichroic splitter device is located in back-focal path of the telescope. It allows splitting the incoming optical beam between VNIR and SWIR focal planes. It shall ensure an extremely high rejection, better than 1:1000, between both ranges while introducing negligible aberrations in reflected (VNIR) and transmitted (SWIR) paths. The splitter assembly consists of a wedged dichroic filter plate and a wedged compensator plate mounted in a common frame. Both plates are made of fused silica (Infrasil) and polished to lambda/40. The major challenges reside in the design complexity of the dichroic coating and in the deposition process control to ensure the required high uniformity of performances through the large aperture. The paper presents the final spectral and optical performances of this challenging sub-system. It also discusses the main difficulties that have been overpassed during the development and qualification phase.

Paper Details

Date Published: 24 October 2013
PDF: 7 pages
Proc. SPIE 8889, Sensors, Systems, and Next-Generation Satellites XVII, 88891K (24 October 2013); doi: 10.1117/12.2028751
Show Author Affiliations
V. Moreau, AMOS s.a. (Belgium)
M. Lappschies, Optics Balzers Jena GmbH (Germany)
F. Camus, EADS Astrium S.A.S. (France)
V. Kirschner, European Space Research and Technology Ctr. (Netherlands)
C. Haas, EADS Astrium GmbH (Germany)


Published in SPIE Proceedings Vol. 8889:
Sensors, Systems, and Next-Generation Satellites XVII
Roland Meynart; Steven P. Neeck; Haruhisa Shimoda, Editor(s)

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