Dr. Mélanie Roulet Profile

Dr. Mélanie Roulet

at Lab d'Astrophysique de Marseille

SPIE Involvement:

Author

Publications (22)

Proceedings Article | 29 August 2022 Presentation + Paper

Presentation + Paper

Additively manufactured flexure for astronomy instrumentation

Katherine Morris, Carolyn Atkins, Lucy Reynolds, James Walpole, Bart van de Vorst, Robert M. Snell, Chris Miller, Szigfrid Farkas, György Mező, Mélanie Roulet, Afrodisio Vega Moreno, Fabio Tenegi, Andrew Conley, Hermine Schnetler

Proceedings Volume 12188, 121880Z (2022) https://doi.org/10.1117/12.2630180

KEYWORDS: Manufacturing, Additive manufacturing, Actuators, Astronomy, Titanium, Aluminum, Metals, MATLAB, Scanning electron microscopy, Optics manufacturing

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Proceedings Article | 29 August 2022 Presentation + Paper

Presentation + Paper

The OPTICON A2IM Cookbook: an introduction to additive manufacture for astronomy

Carolyn Atkins, L. G. T. (Bart) van de Vorst, Andrew Conley, Szigfrid Farkas, Emmanuel Hugot, György Mező, Katherine Morris, Mélanie Roulet, Robert M. Snell, Fabio Tenegi-Sanginés, Iain Todd, Afrodisio Vega-Moreno, Hermine Schnetler

Proceedings Volume 12188, 121880W (2022) https://doi.org/10.1117/12.2627244

KEYWORDS: Computer aided design, Metals, Additive manufacturing, Optics manufacturing, Astronomy, Astronomical instrumentation, Mirrors, Lightweight mirrors, Printing, 3D printing

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Proceedings Article | 27 August 2022 Presentation + Paper

Presentation + Paper

Super polished mirrors for the Roman Space Telescope CoronaGraphic Instrument: design, manufacturing, and optical performances

A. Caillat, M. Ferrari, M. Marcos, C. Pariès, A. Bonnefoi, V. Vitrac, M. Roulet, E. Hugot

Proceedings Volume 12180, 121801Y (2022) https://doi.org/10.1117/12.2627240

KEYWORDS: Mirrors, Polishing, Optics manufacturing, Manufacturing, Surface finishing, Coronagraphy, Space telescopes, Tolerancing, Optical instrument design, Off axis mirrors

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Proceedings Article | 13 December 2020 Presentation + Paper

Presentation + Paper

H2020 opticon WP5 overview: investigating the use of additive manufacturing AM) for the design and build of multifunctional integrated astronomical components

Hermine Schnetler, Bart van de Vorst, Robert Snell, Carolyn Atkins, Chris Miller, Katherine Morris, Szigfrid Farkas, György Mező, Mélanie Roulet, Emmanuel Hugot, Afrodisio Vega Moreno, Fabio Tenegi, Joris Dufils

Proceedings Volume 11451, 114511P (2020) https://doi.org/10.1117/12.2560828

KEYWORDS: Additive manufacturing, Astronomy, Mirrors, Optics manufacturing, Astronomical imaging, Integrated optics, Cryogenics, Printing, Materials processing, Optical components

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Proceedings Article | 13 December 2020 Presentation + Paper

Presentation + Paper

An additive manufactured CubeSat mirror incorporating a novel circular lattice

Robert Snell, Carolyn Atkins, Hermine Schnetler, Iain Todd, Everth Hernández-Nava, Alistair Lyle, George Maddison, Katherine Morris, Christopher Miller, Mélanie Roulet, Emmanuel Hugot, Fabio Tenegi Sanginés, Afrodisio Vega-Moreno, L. T. G. (Bart) van de Vorst, Joris Dufils, Leon Brouwers, Szigfrid Farkas, György Mező, Mat Beardsley, Michael Harris

Proceedings Volume 11451, 114510C (2020) https://doi.org/10.1117/12.2562738

KEYWORDS: Mirrors, Additive manufacturing, Prototyping, Interferometry, 3D printing, Telescopes, Interfaces, Silicon, Aluminum, Single point diamond turning

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Proceedings Article | 13 December 2020 Poster + Paper

Poster + Paper

Freeform active mirror designed for additive manufacturing

Szigfrid Farkas, Tibor Agócs, Carolyn Atkins, Leon Brouwers, Joris Dufils, András Joó, György Mező, Katherine Morris, Michiel Rodenhuis, Mélanie Roulet, Hermine Schnetler, Robert Snell, Fabio Tenegi-Sanginés, Afrodisio Vega-Moreno, Bart van de Vorst

Proceedings Volume 11451, 114512M (2020) https://doi.org/10.1117/12.2561327

KEYWORDS: Additive manufacturing, Disk lasers, Actuators, Optics manufacturing, Telescopes, Mirrors, Prototyping, Optical fabrication, Assembly tolerances, Interfaces

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Proceedings Article | 13 December 2020 Poster + Paper

Poster + Paper

Design for additive manufacture (DfAM): the “equivalent continuum material” for cellular structures analysis

Afrodisio Vega, Fabio Tenegi, Juan Francisco Márquez, Juan Calvo, Hermine Schnetler, Carolyn Atkins, Chris Miller, Katherine Morris, Robert Snell, Bart van de Vorst, Joris Dufils, Leon Brouwers, Mélanie Roulet, Emmanuel Hugot, Szigfrid Farkas, Gyorgy Mezo

Proceedings Volume 11450, 1145028 (2020) https://doi.org/10.1117/12.2560999

KEYWORDS: Additive manufacturing, Design for manufacturability, Modeling, Prototyping, Structural design

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Proceedings Article | 20 April 2020 Presentation + Paper

Presentation + Paper

Use of 3D printing in astronomical mirror fabrication

Mélanie Roulet, Carolyn Atkins, Emmanuel Hugot, Robert Snell, Bart van de Vorst, Katherine Morris, Michel Marcos, Iain Todd, Christopher Miller, Joris Dufils, Szigfrid Farkas, Gyorgy Mezo, Fabio Tenegi, Afrodisio Vega-Moreno, Hermine Schnelter

Proceedings Volume 11349, 113490D (2020) https://doi.org/10.1117/12.2556921

KEYWORDS: Mirrors, Surface finishing, Computer aided design, Polishing, Printing, 3D printing, Prototyping, Monochromatic aberrations, Manufacturing, Finite element methods

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Proceedings Article | 12 July 2019 Open Access

Open Access

Paper

WFIRST OAPs' fabrication: prototyping phase

Mélanie Roulet, Emmanuel Hugot, Carolyn Atkins, Sabri Lemared, Marc Ferrari, Simona Lombardo

Proceedings Volume 11180, 111806X (2019) https://doi.org/10.1117/12.2536168

KEYWORDS: Monochromatic aberrations, Computer aided design, Optics manufacturing, 3D printing, Polishing, Prototyping, Surface finishing, Finite element methods, Manufacturing, Coronagraphy

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This paper describes the development of a new manufacturing process to directly obtain off-axis parabolas (OAP) by combining 3D printing and stress polishing. 3D printing opens up a new vision for optics fabrication by providing innovative lightweight structures which are not fabricable with traditional mechanical manufacturing. It also provides a new range of materials covering plastic up to metal through composite materials and ceramics.

The direct imaging of exoplanets using coronagraphic instruments provides a good example of an astronomical application that can greatly benefit from such developments. Exoplanets imaging is very demanding in terms of optical surface quality, however, the majority of coronagraphic instruments use off axis optics, which manufacturing of such optics could present some drawbacks: either the optics are cut out of a parent large mirror, resulting in a material loss, or the surfaces are machined with sub-aperture tools, resulting in high spatial frequency ripples which must be avoided for this application.

Thanks to 3D printing and topology optimisation we created an innovative warping harness design which can generate any off axis parabola shapes with only one actuator. We optimised the harness thickness distribution in order to reach non symmetrical deformation composed of astigmatism and coma. The warping is applied by micrometric screws and the high transmission factor of the system allows to keep stable the final error budget despite the error introduced by the warping harness fabricated by 3D printing. Several warping harness designs and materials were explored for the prototyping phase. This study is part of WFIRST satellite which will be launch in 2024 by NASA to observe galaxies via a wide field instrument and also perform exoplanet direct imaging via coronagraph. In the case of the WFIRST coronagraphic instrument, eight off axis parabolas are used to relay the beam from one pupil to another. We present the first prototyping results dedicated to the WFIRST off axis parabolas. Deformation surface results are performed by interferometric measurements and compared to Finite Element Analysis predictions.

Proceedings Article | 12 July 2019 Open Access

Open Access

Paper

MESSIER: exploring the ultra-low surface brightness universe with a curved focal plane based satellite

S. Lombardo, E. Muslimov, D. Valls-Gabaud, E. Hugot, G. Lemaître, M. Roulet, M. Ferrari, K. Joaquina

Proceedings Volume 11180, 111802W (2019) https://doi.org/10.1117/12.2536023

KEYWORDS: Point spread functions, Monte Carlo methods, Sensors, Device simulation, Charge-coupled devices, Satellites, Stars, Ultraviolet radiation, Atmospheric optics, Photon transport

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Proceedings Article | 31 July 2018 Paper

Paper

Curved CMOS sensor: characterization of the first fully functional prototype

Simona Lombardo, Thibault Behaghel, Bertrand Chambion, Wilfried Jahn, Emmanuel Hugot, Eduard Muslimov, Melanie Roulet, Marc Ferrari, Christophe Gaschet, David Henry, Stéphane Caplet

Proceedings Volume 10679, 1067910 (2018) https://doi.org/10.1117/12.2307170

KEYWORDS: Sensors, CMOS sensors, Prototyping, Electrons, Temperature metrology, Imaging systems, Detector development, Error analysis, Interference (communication), Optical design

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Proceedings Article | 30 July 2018 Paper

Paper

Superpolished OAPs for WFIRST CGI

Mélanie Roulet, Emmanuel Hugot, Carolyn Atkins, Sabri Lemared, Simona Lombardo, Marc Ferrari

Proceedings Volume 10698, 106982Q (2018) https://doi.org/10.1117/12.2312633

KEYWORDS: Computer aided design, Polishing, Surface finishing, Manufacturing, 3D printing, Finite element methods, Prototyping, Mirrors, Coronagraphy

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Proceedings Article | 20 July 2018 Paper

Paper

Curved detectors developments and characterization: application to astronomical instruments

Simona Lombardo, Thibault Behaghel, Bertrand Chambion, Wilfried Jahn, Emmanuel Hugot, Eduard Muslimov, Melanie Roulet, Marc Ferrari, Christophe Gaschet, Stéphane Caplet, David Henry

Proceedings Volume 10709, 107090U (2018) https://doi.org/10.1117/12.2312654

KEYWORDS: Sensors, CMOS sensors, Astronomy, Image sensors, Detector development, Electrons, Temperature metrology, Imaging systems, Prototyping, Error analysis

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Proceedings Article | 10 July 2018 Presentation + Paper

Presentation + Paper

Topological design of lightweight additively manufactured mirrors for space

Carolyn Atkins, Charlotte Feldman, David Brooks, Stephen Watson, William Cochrane, Melanie Roulet, Emmanuel Hugot, Mat Beardsley, Michael Harris, Christopher Spindloe, Simon Alcock, Ioana-Theodora Nistea, Christian Morawe, François Perrin

Proceedings Volume 10706, 107060I (2018) https://doi.org/10.1117/12.2313353

KEYWORDS: Mirrors, Polishing, Surface roughness, Additive manufacturing, Finite element methods, Space mirrors, Aluminum, Single point diamond turning, Lightweight mirrors, Error analysis, 3D printing

Read Abstract +

Additive manufacturing (AM), more commonly known as 3D printing, is a commercially established technology for rapid prototyping and fabrication of bespoke intricate parts. To date, research quality mirror prototypes are being trialled using additive manufacturing, where a high quality reflective surface is created in a post-processing step. One advantage of additive manufacturing for mirror fabrication is the ease to lightweight the structure: the design is no longer confined by traditional machining (mill, drill and lathe) and optimised/innovative structures can be used. The end applications of lightweight AM mirrors are broad; the motivation behind this research is low mass mirrors for space-based astronomical or Earth Observation imaging. An example of a potential application could be within nano-satellites, where volume and mass limits are critical. The research presented in this paper highlights the early stage experimental development in AM mirrors and the future innovative designs which could be applied using AM.

The surface roughness on a diamond-turned AM aluminium (AlSi₁₀Mg) mirror is presented which demonstrates the ability to achieve an average roughness of ~3.6nm root mean square (RMS) measured over a 3 x 3 grid. A Fourier transform of the roughness data is shown which deconvolves the roughness into contributions from the diamond-turning tooling and the AM build layers. In addition, two nickel phosphorus (NiP) coated AlSi₁₀Mg AM mirrors are compared in terms of surface form error; one mirror has a generic sandwich lightweight design at 44% the mass of a solid equivalent, prior to coating and the second mirror was lightweighted further using the finite element analysis tool topology optimisation. The surface form error indicates an improvement in peak-to-valley (PV) from 323nm to 204nm and in RMS from 83nm to 31nm for the generic and optimised lightweighting respectively while demonstrating a weight reduction between the samples of 18%. The paper concludes with a discussion of the breadth of AM design that could be applied to mirror lightweighting in the future, in particular, topology optimisation, tessellating polyhedrons and Voronoi cells are presented.

Proceedings Article | 10 July 2018 Presentation + Paper

Presentation + Paper

Characterization of an f/2 freeform active mirror

Szigfrid Farkas, Tibor Agócs, Gabby Aitink-Kroes, Lee Chapman, William Cochrane, Wayne Holland, Emmanuel Hugot, Fahad Iqbal, Dávid Jáger, Michel Marcos, György Mező, Maria Milanova, Chris Miller, David Montgomery, Michiel Rodenhuis, Mélanie Roulet, Hermine Schnetler

Proceedings Volume 10706, 1070617 (2018) https://doi.org/10.1117/12.2313413

KEYWORDS: Actuators, Mirrors, Finite element methods, Computer aided design, Optics manufacturing, Optical testing, Solid modeling, Control systems, Performance modeling

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Proceedings Article | 5 June 2018 Paper

Paper

Advanced optical designs of curved detectors-based two-mirrors unobsured telescopes

Eduard Muslimov, Emmanuel Hugot, Simona Lombardo, Melanie Roulet, Thibault Behaghel, Marc Ferrari, Wilfried Jahn

Proceedings Volume 10690, 1069025 (2018) https://doi.org/10.1117/12.2311885

KEYWORDS: Sensors, Telescopes, Optical design, Optical instrument design, Image quality, Mirrors, Telescope design, Shape analysis, Monochromatic aberrations, Astronomical detectors, CCD image sensors

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Proceedings Article | 24 May 2018 Presentation + Paper

Presentation + Paper

Curved detectors for wide field imaging systems: impact on tolerance analysis

Eduard Muslimov, Emmanuel Hugot, Simona Lombardo, Melanie Roulet, Thibault Behaghel, Marc Ferrari, Wilfried Jahn, Christophe Gaschet, Bertrand Chambion, David Henry

Proceedings Volume 10679, 106790W (2018) https://doi.org/10.1117/12.2305923

KEYWORDS: Sensors, Tolerancing, Image quality, Telescopes, Optical design, Manufacturing, Imaging systems, Lens design, Image quality standards

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Proceedings Article | 24 May 2018 Paper

Paper

Freeform optics complexity estimation: comparison of methods

Eduard Muslimov, Emmanuel Hugot, Simona Lombardo, Melanie Roulet, Marc Ferrari

Proceedings Volume 10679, 106791M (2018) https://doi.org/10.1117/12.2306671

KEYWORDS: Aspheric lenses, Telescopes, Mirrors, Image quality, Optical design, Freeform optics, Telescope design, Optical spheres, Optical instrument design, Manufacturing

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Proceedings Article | 22 May 2018 Paper

Paper

3D printing for astronomical mirrors

Melanie Roulet, Carolyn Atkins, Emmanuel Hugot, Sabri Lemared, Simona Lombardo, Marc Ferrari

Proceedings Volume 10675, 1067504 (2018) https://doi.org/10.1117/12.2306836

KEYWORDS: 3D printing, Polishing, Computer aided design, Surface finishing, Optics manufacturing

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Proceedings Article | 8 September 2017 Paper

Paper

Design and modeling of an additive manufactured thin shell for x-ray astronomy

Charlotte Feldman, Carolyn Atkins, David Brooks, Stephen Watson, William Cochrane, Melanie Roulet, Richard Willingale, Peter Doel

Proceedings Volume 10399, 103991H (2017) https://doi.org/10.1117/12.2273422

KEYWORDS: X-ray astronomy, Additive manufacturing, X-rays, X-ray telescopes, Mirrors, X-ray technology, X-ray optics, Astronomy, Prototyping

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Proceedings Article | 29 August 2017 Paper

Paper

Additive manufactured x-ray optics for astronomy

Carolyn Atkins, Charlotte Feldman, David Brooks, Stephen Watson, William Cochrane, Melanie Roulet, Peter Doel, Richard Willingale, Emmanuel Hugot

Proceedings Volume 10399, 103991G (2017) https://doi.org/10.1117/12.2274011

KEYWORDS: Additive manufacturing, Optics manufacturing, X-ray optics, X-ray astronomy, Astronomy, Finite element methods, Mirrors, Polishing, X-ray telescopes, 3D printing

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Proceedings Article | 24 August 2017 Presentation + Paper

Presentation + Paper

Curved sensors for compact high-resolution wide field designs

Christophe Gaschet, Bertrand Chambion, Stéphane Gétin, Gaid Moulin, Aurélie Vandeneynde, Stéphane Caplet, David Henry, Emmanuel Hugot, Wilfried Jahn, Thibault Behaghel, Simona Lombardo, Mélanie Roulet, Eduard Muslimov, Marc Ferrari

Proceedings Volume 10376, 1037603 (2017) https://doi.org/10.1117/12.2272451

KEYWORDS: Sensors, Monochromatic aberrations, Optical design, Electro optics, Biomedical optics, Electronics, Optoelectronics, Lenses, Image sensors, Aspheric lenses

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Showing 5 of 22 publications

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