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Proceedings Paper • Open Access • new

Optical MEMS for Earth observation
Author(s): Arnaud Liotard; Thierry Viard; Wilfried Noell; Frédéric Zamkotsian; Marco Freire; Benedikt Guldimann; Stefan Kraft

Paper Abstract

Due to the relatively large number of optical Earth Observation missions at ESA, this area is interesting for new space technology developments. In addition to their compactness, scalability and specific task customization, optical MEMS could generate new functions not available with current technologies and are thus candidates for the design of future space instruments. Most mature components for space applications are the digital mirror arrays, the micro-deformable mirrors, the programmable micro diffraction gratings and tiltable micromirrors. A first selection of market-pull and techno-push concepts is done. In addition, some concepts are coming from outside Earth Observation. Finally two concepts are more deeply analyzed.

The first concept is a programmable slit for straylight control for space spectro-imagers. This instrument is a push-broom spectroimager for which some images cannot be exploited because of bright sources in the field-of-view. The proposed concept consists in replacing the current entrance spectrometer slit by an active row of micro-mirrors. The MEMS will permit to dynamically remove the bright sources and then to obtain a field-of-view with an optically enhanced signal-to-noise ratio.

The second concept is a push-broom imager for which the acquired spectrum can be tuned by optical MEMS. This system is composed of two diffractive elements and a digital mirror array. The first diffractive element spreads the spectrum. A micromirror array is set at the location of the spectral focal plane. By putting the micro-mirrors ON or OFF, we can select parts of field-of-view or spectrum. The second diffractive element then recombines the light on a push-broom detector. Dichroics filters, strip filter, band-pass filter could be replaced by a unique instrument.

Paper Details

Date Published: 20 November 2017
PDF: 10 pages
Proc. SPIE 10564, International Conference on Space Optics — ICSO 2012, 105642N (20 November 2017); doi: 10.1117/12.2309200
Show Author Affiliations
Arnaud Liotard, Thales Alenia Space (France)
Thierry Viard, Thales Alenia Space (France)
Wilfried Noell, EPFL - SAMLAB (Switzerland)
Frédéric Zamkotsian, Lab. d'Astrophysique de Marseille (France)
Marco Freire, ESA-ESTEC (Netherlands)
Benedikt Guldimann, ESA-ESTEC (Netherlands)
Stefan Kraft, ESA-ESTEC (Netherlands)


Published in SPIE Proceedings Vol. 10564:
International Conference on Space Optics — ICSO 2012
Bruno Cugny; Errico Armandillo; Nikos Karafolas, Editor(s)

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