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Proceedings Paper

DMD-based programmable wide field spectrograph for Earth observation
Author(s): Frédéric Zamkotsian; Patrick Lanzoni; Arnaud Liotard; Thierry Viard; Vincent Costes; Philippe-Jean Hébert
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Paper Abstract

In Earth Observation, Universe Observation and Planet Exploration, scientific return could be optimized in future missions using MOEMS devices. In Earth Observation, we propose an innovative reconfigurable instrument, a programmable wide-field spectrograph where both the FOV and the spectrum could be tailored thanks to a 2D micromirror array (MMA). For a linear 1D field of view (FOV), the principle is to use a MMA to select the wavelengths by acting on intensity. This component is placed in the focal plane of a first grating. On the MMA surface, the spatial dimension is along one side of the device and for each spatial point, its spectrum is displayed along the perpendicular direction: each spatial and spectral feature of the 1D FOV is then fully adjustable dynamically and/or programmable. A second stage with an identical grating recomposes the beam after wavelengths selection, leading to an output tailored 1D image. A mock-up has been designed, fabricated and tested. The micromirror array is the largest DMD in 2048 x 1080 mirrors format, with a pitch of 13.68μm. A synthetic linear FOV is generated and typical images have been recorded o at the output focal plane of the instrument. By tailoring the DMD, we could modify successfully each pixel of the input image: for example, it is possible to remove bright objects or, for each spatial pixel, modify the spectral signature. The very promising results obtained on the mock-up of the programmable wide-field spectrograph reveal the efficiency of this new instrument concept for Earth Observation.

Paper Details

Date Published: 10 March 2015
PDF: 13 pages
Proc. SPIE 9376, Emerging Digital Micromirror Device Based Systems and Applications VII, 93760G (10 March 2015); doi: 10.1117/12.2081020
Show Author Affiliations
Frédéric Zamkotsian, Lab. d'Astrophysique de Marseille (France)
Patrick Lanzoni, Lab. d'Astrophysique de Marseille (France)
Arnaud Liotard, Thales Alenia Space (France)
Thierry Viard, Thales Alenia Space (France)
Vincent Costes, Ctr. National d'Études Spatiales (France)
Philippe-Jean Hébert, Ctr. National d'Études Spatiales (France)


Published in SPIE Proceedings Vol. 9376:
Emerging Digital Micromirror Device Based Systems and Applications VII
Michael R. Douglass; Philip S. King; Benjamin L. Lee, Editor(s)

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