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Proceedings Paper

Compact prism spectrometer of pushbroom type for hyperspectral imaging
Author(s): Stefan Kaiser; Bernhard Sang; Josef Schubert; Stefan Hofer; Timo Stuffler
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Paper Abstract

Imaging spectrometers featuring a grating disperser allow for a compact system design. However, due to the limited diffraction efficiency of the grating these instruments suffer from low throughput and high sensitivity to polarization. Prism spectrometers do not have these disadvantages, but they show a low angular dispersion with noticeable non-linearity, which is the main driver of the overall spectrometer dimensions. The envelope of a prism spectrometer can be significantly decreased when prisms with curved surfaces are used. They allow for a reconfiguration of the concentric Offner relay which is well known for its good imaging quality and its low distortion. In the document at hand a novel type of compact Offner spectrometers with curved prisms is presented. As an example the optic design of EnMAP, a German space born hyperspectral imager is given.

Paper Details

Date Published: 27 September 2008
PDF: 11 pages
Proc. SPIE 7100, Optical Design and Engineering III, 710014 (27 September 2008); doi: 10.1117/12.797177
Show Author Affiliations
Stefan Kaiser, Kayser-Threde GmbH (Germany)
Bernhard Sang, Kayser-Threde GmbH (Germany)
Josef Schubert, Kayser-Threde GmbH (Germany)
Stefan Hofer, Kayser-Threde GmbH (Germany)
Timo Stuffler, Kayser-Threde GmbH (Germany)

Published in SPIE Proceedings Vol. 7100:
Optical Design and Engineering III
Laurent Mazuray; Rolf Wartmann; Andrew Wood; Jean-Luc Tissot; Jeffrey M. Raynor, Editor(s)

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