Dr. Nicolas Tetaz Profile

Dr. Nicolas Tetaz

at Thales Alenia Space

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Publications (8)

Proceedings Article | 12 July 2023 Open Access

Compact static interferometer instrument studies for greenhouse gas detection

Flavio Mariani, Denis Simeoni, Nurcan Alpay Koc, Vitalii Khodnevych, Nicolas Tetaz, Bruno Chetrite, Mikael Carlavan, Stephane Ferron, Jean-Luc Vergely, Nick van der Valk, Hedser van Brug, Benjamin Brenny, Huib Visser, Jochen Landgraf, Stephanie Rusli, Roman Windpassinger, Bernd Sierk

Proceedings Volume 12777, 127771V (2023) https://doi.org/10.1117/12.2689941

KEYWORDS: Equipment, Carbon monoxide, Optical path differences, Interferometers, Near infrared, Short wave infrared radiation, Aerosols, Atmospheric modeling, Astronomical imaging, Spatial resolution

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Proceedings Article | 28 October 2022 Paper

CarbonCGI road map to observe faint GHG source’s emissions with high resolution observing system

D. Siméoni, F. Graziosi, G. Broquet, P. Kumar, P. Ciais, J. Vergely, S. Ferron, V. Khodnevych, M. Carlavan, B. Chétrite, N. Tetaz, C. Delzenne, N. Guercio, H. Boesch, L. Vogel, F. Mariani, R. Windpassinger, B. Sierk

Proceedings Volume 12264, 122640D (2022) https://doi.org/10.1117/12.2638495

KEYWORDS: Atmospheric modeling, Sensors, Imaging systems, Aerosols, Near infrared, Radiative transfer, Modeling, Carbon dioxide, Interferometers, Image registration

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Proceedings Article | 11 June 2021 Open Access

Active optics in deployable systems for future earth observation and science missions

Ludovic Canas, Stéphanie Behar-Lafenêtre, Christophe Devilliers, Laurent Perrona, Lauriane Galtier, David Boban, Nicolas Tetaz, Guillaume Butel, Aurélien Suau, Jérôme Demilly, Stéphane Vezain, Frédéric Falzon, Jean-François Sauvage, Laurent Mugnier, Noah Schwartz, Ruben Sanchez-Janssen, Marc Ferrari, Mamadou N'Diaye, Pascal Hallibert

Proceedings Volume 11852, 118522H (2021) https://doi.org/10.1117/12.2599380

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Proceedings Article | 11 June 2021 Open Access

MOEMS-based spectro-imagers for Earth and Universe Observation

Mathieu Vachey, Frédéric Zamkotsian, Hervé Benard, Arnaud Liotard, Nicolas Tetaz, Vincent Costes

Proceedings Volume 11852, 118523N (2021) https://doi.org/10.1117/12.2599614

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MOEMS-based instruments could be the next stepping stone in ground-based and space telescopes for Universe and Earth Observation. Targeted instruments are next generation multi-object spectrographs, as MOEMS can be used as reconfigurable slit masks at the MOS entrance, allowing increased instrument compacity and new observational modes such as SNR optimization. For Earth Observation, the use of MOEMS acting like programmable slit masks also allows a dynamic removal of the bright sources in the field of view, therefore enhancing the global SNR of the instrument. We propose a MOEMS-based spectro-imager named BATMAN, using a Digital-Micromirror-Device (DMD) to split the light between its imaging and spectrograph arms. This instrument is intended to be installed at the TNG telescope in the Canary Islands in 2022. This concept has been extended for space Universe and Earth Observation. A new MOEMS-based spectro-imager for Earth Observation has been designed, with constraints of wide 2D field-ofview (3°x1°), image quality (< 2 pixels = 11 μm) and compacity (Fig. 1). The instrument is panchromatic with a medium spectral resolution between 1000 and 2000, fitting in a 80 cm x 80 cm x 40 cm box. A 3-mirror solution for both imaging and spectrograph arms has been designed, using only aspheric surfaces, allowing for easier alignment and tolerancing. The compact design contains a convex grating to disperse light. In order to optimize the spectrograph efficiency, this convex grating must be blazed at the right angle for maximizing the light in the first order of diffraction. For Universe Observation, a new design for a DMD-based high-resolution spectro-imager has been done. For the spectrograph, the large 370 – 950 nm wavelength range is divided into 4 channels for a spectral resolution of 15 000, all with an image quality of under two pixels. Moreover, the 3-mirror design of the instrument allows for a high throughput in comparison to classical systems which use catadioptric optics. These results show the great interest of MOEMS-based spectro-imagers for space Earth and Universe Observation.

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Proceedings Article | 21 August 2020 Presentation + Paper

New spectro-imager designs for MOEMS-based instruments in Earth and Universe observation

Mathieu Vachey, Frédéric Zamkotsian, Vincent Costes, Hervé Benard, Arnaud Liotard, Nicolas Tetaz

Proceedings Volume 11483, 1148308 (2020) https://doi.org/10.1117/12.2569670

KEYWORDS: Spectrographs, Spectral resolution, Imaging systems, Telescopes, Image quality, Micromirrors, Digital micromirror devices, Spatial resolution

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Proceedings Article | 12 July 2019 Open Access

Innovative focal plane segmentation for high-resolution planetary observation

Grégoire Hein, Marc Ferrari, Nicolas Tetaz

Proceedings Volume 11180, 111803O (2019) https://doi.org/10.1117/12.2536051

KEYWORDS: Telescopes, Image segmentation, Mirrors, Sensors, Image quality, CMOS sensors, Staring arrays, Satellites, Diffraction, Satellite imaging

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Proceedings Article | 12 July 2019 Open Access

Binary blazed reflection grating for UV/VIS/NIR/SWIR spectral range

Frank Burmeister, Thomas Flügel-Paul, Uwe Zeitner, Mane-Si-Laure Lee Bouhours, Gaëlle Lehoucq, Julie Cholet, Brigitte Loiseaux, Nicolas Tetaz, Roman Windpassinger, Matteo Taccola

Proceedings Volume 11180, 111801J (2019) https://doi.org/10.1117/12.2535974

KEYWORDS: Diffraction gratings, Diffraction, Binary data, Optical design, Manufacturing, Nanoimprint lithography, Prototyping, Electron beam lithography, Ultraviolet radiation, Silicon

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Proceedings Article | 17 November 2017 Open Access

Advanced large FOV UV/VIS/NIR/SWIR spectrometers for future earth observation instruments

Nicolas Tetaz, Cyril Ruilier, Matteo Taccola, Thierry Viard, Mane-Si-Laure Lee Bouhours, Brigitte Loiseaux, Gaëlle Lehoucq

Proceedings Volume 10563, 1056333 (2017) https://doi.org/10.1117/12.2304218

KEYWORDS: Spectrometers, Space telescopes, Telescopes, Short wave infrared radiation, Astronomical imaging, Imaging systems, Optical design, Collimators, Ultraviolet radiation, Calibration

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