Ms. Stéphanie Behar-Lafenetre Profile

Stéphanie Behar-Lafenetre

Project Manager at Thales Alenia Space

SPIE Involvement:

Author

Proceedings Article | 12 July 2023 Open Access

New generation, compact and smart space Earth observation instrument

R. Auribault, G. Bordot, S. Behar Lafenetre

Proceedings Volume 12777, 1277743 (2023) https://doi.org/10.1117/12.2690650

KEYWORDS: Video, Equipment, Mirrors, Video compression, Design and modelling, Astronomical imaging, Telescopes, Space mirrors, Sensors, Polishing

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Proceedings Article | 11 June 2021 Open Access

Silicon nitride for space optical applications

Stéphanie Behar-Lafênetre, Philippe Grasset, Nisrine Louh, Laurence Cornillon, Miguel Such-Taboada, Florent Gant, Vincent Costes

Proceedings Volume 11852, 118524T (2021) https://doi.org/10.1117/12.2599815

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Proceedings Article | 11 June 2021 Open Access

In-orbit characterization of the ISRF

Thierry Garnier, Hervé Bénard, Stéphanie Béhar-Lafenêtre, Ralph Snel, Marcela Pelica Páscoa, Niels Dijkhuizen, Bart Speet, Geert Slegtenhorst, Luca Maresi, Arnaud Pasquet, Mathijs Arts

Proceedings Volume 11852, 118523L (2021) https://doi.org/10.1117/12.2599611

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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 | 9 September 2019 Paper

Active optics for space telescopes

Damien Sucher, Guillaume Butel, Guillaume Briche, Jean-François Blanc, Arnaud Liotard, Marc Bernot, Mikaël Carlavan, Aurélien Suau, Nisrine Louh, Lauriane Galtier, Sebastien Guionie, Thierry Viard, Stéphanie Behar-Lafenetre, Fabrice Champandard, Jean-Bernard Ghibaudo, Vincent Costes

Proceedings Volume 11116, 1111611 (2019) https://doi.org/10.1117/12.2529103

KEYWORDS: Telescopes, Mirrors, Active optics, Deformable mirrors, Space telescopes, Aerospace engineering, Actuators, Optical instrument design, Optical alignment, Algorithm development

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Proceedings Article | 30 August 2019 Paper

Silicon nitride for structural parts of space applications

Stéphanie Behar-Lafenêtre, Nisrine Louh, Philippe Grasset, Laurence Cornillon, Miguel Such-Taboada

Proceedings Volume 11101, 1110103 (2019) https://doi.org/10.1117/12.2529078

KEYWORDS: Failure analysis, Ceramics, Aerospace engineering, X-rays, Tomography, Nondestructive evaluation, Statistical analysis, Analytical research, Inspection

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Proceedings Article | 30 August 2019 Paper

Strength of Zerodur for mirror applications: follow-up

Stéphanie Behar-Lafenetre, Philippe Grasset, Laurence Cornillon, Florent Gant, Sonia Ait-Zaid

Proceedings Volume 11101, 111010J (2019) https://doi.org/10.1117/12.2529068

KEYWORDS: Mirrors, Space mirrors, Failure analysis, Surface finishing, Manufacturing, Space telescopes, Ceramics, Glasses, Mechanics

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Zerodur® is a well-known glass-ceramic used for optical components because of its unequalled dimensional stability under thermal environment. In particular it has been used since decades in Thales Alenia Space’s optical payloads for space telescopes, especially for mirrors. The drawback of Zerodur® is however its quite low strength, but the relatively small size of mirrors in the past had made it unnecessary to further investigate this aspect, although elementary tests have always shown higher failure strength. As performance of space telescopes is increasing, the size of mirrors increases accordingly, and an optimization of the design is necessary, mainly for mass saving. Therefore the question of the effective strength of Zerodur® has become a real issue. Thales Alenia Space has investigated the application of the Weibull law and associated size effects on Zerodur® in 2014, under CNES funding, through a thorough test campaign with a high number of samples (300) of various types. That test campaign demonstrated a strength in fast fracture higher than 40 MPa ([1], [2]) for the tested surface finish, thus allowing much more versatility in the designs than the previously accepted strength limit (10 MPa). Another concern had however been raised: glasses are known to be susceptible to sub-critical crack growth, i.e. slow propagation of cracks under loads below fracture toughness, thus reducing fast fracture strength capabilities (since failure is linked to sudden propagation of those cracks). Taking into account data from literature, no effect was expected on Zerodur® in the conditions of use for space applications, but the very high variability of data made those computations not reliable enough. A dedicated test campaign was therefore defined in order to assess this effect and its consequences in conditions as representative as possible of real conditions. In this paper we show the outcome of this test campaign: the effect of subcritical crack growth is confirmed to be negligible and the minimum strength of 40 MPa is confirmed. In time, Zerodur® strength seems to even increase but this phenomenon was not investigated in the study.

Proceedings Article | 21 November 2017 Open Access

Highly light-weighted ZERODUR mirrors

Stéphanie Behar-Lafenetre, Thierry Lasic, Roger Viale, Jean-Claude Mathieu, Eric Ruch, Michel Tarreau, Pierre Etcheto

Proceedings Volume 10566, 105660O (2017) https://doi.org/10.1117/12.2308286

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Proceedings Article | 21 November 2017 Open Access

Highly light-weighted ZERODUR mirror and fixation for cryogenic applications

Stephanie Behar-Lafenetre, Thierry Lasic, Roger Viale, Eric Ruch

Proceedings Volume 10567, 1056717 (2017) https://doi.org/10.1117/12.2308175

KEYWORDS: Zerodur, Mirrors, Cryogenics

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Proceedings Article | 17 November 2017 Open Access

Silicon nitride ceramic development in Thales Alenia Space : qualification achievement and further developments for future applications

L. Cornillon, C. Devilliers, S. Behar-Lafenetre, S. Ait-Zaid, K. Berroth, A. C. Bravo

Proceedings Volume 10563, 105631H (2017) https://doi.org/10.1117/12.2304158

KEYWORDS: Manufacturing, Silicon, Ceramics, Astronomical imaging, Mirrors, Surface finishing, Space telescopes, Polishing, Databases, Scanning electron microscopy

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Proceedings Article | 17 November 2017 Open Access

Silicon nitride ceramic development in Thales Alenia Space: qualification achiement and further developments for future applications

L. Cornillon, C. Devilliers, S. Behar-Lafenetre, S. Ait-Zaid, K. Berroth, A. C. Bravo

Proceedings Volume 10563, 105635S (2017) https://doi.org/10.1117/12.2304135

KEYWORDS: Manufacturing, Silicon, Ceramics, Astronomical imaging, Mirrors, Surface finishing, Space telescopes, Polishing, Databases, Scanning electron microscopy

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Proceedings Article | 2 September 2015 Paper

Strength of Zerodur(R) for mirror applications

S. Béhar-Lafenêtre, Laurence Cornillon, Sonia Ait-Zaid

Proceedings Volume 9574, 95740J (2015) https://doi.org/10.1117/12.2188192

KEYWORDS: Failure analysis, Mirrors, Space telescopes, Manufacturing, Statistical analysis, Space mirrors, Surface finishing, Silver, Optical instrument design, Optical components

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Proceedings Article | 30 September 2013 Paper

ESA initiatives to improve mechanical design and verification methods for ceramic structures

Graham Coe, Stéphanie Behar-Lafenetre, Laurence Cornillon, Michaël Rancurel, David Denaux, Dirk Ballhause, Stefano Lucarelli

Proceedings Volume 8837, 88370C (2013) https://doi.org/10.1117/12.2030133

KEYWORDS: Ceramics, Manufacturing, Failure analysis, Space operations, Silicon carbide, Mirrors, Safety, Reliability, Inspection, Space telescopes

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Showing 5 of 13 publications

Conference Committee Involvement (3)

Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems III

4 August 2021 | San Diego, California, United States

Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems II

12 August 2019 | San Diego, California, United States

Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems

8 August 2017 | San Diego, California, United States

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