Dr. Mercedes Filho Profile

Dr. Mercedes Filho

at Univ. do Porto

SPIE Involvement:

Author

Publications (13)

Proceedings Article | 29 August 2022 Presentation + Paper

A mass and vibration optimised solution for 6D precision heavy instrument alignment and its application to METIS

António Amorim, Mercedes Filho, Dirk Lesman, Frederico Carvalho, Ricardo Costa, Marcelino Ngando, Paulo Garcia

Proceedings Volume 12188, 121881A (2022) https://doi.org/10.1117/12.2629383

KEYWORDS: Telescopes, Interfaces, Actuators, Optical alignment, Earthquakes, Tolerancing, Spherical lenses, Prototyping, Optical instrument design, Optical components

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Proceedings Article | 29 August 2022 Poster + Paper

The METIS warm support structure final design

R. Costa, A. Amorim, A. Boné, M. Filho, F. Carvalho, M. Ngando, P. J. V. Garcia

Proceedings Volume 12184, 121843A (2022) https://doi.org/10.1117/12.2629379

KEYWORDS: Interfaces, Finite element methods, Computer aided design, Structural design, 3D modeling, Actuators, Solid modeling, Mechanical engineering, Laser optics, Earthquakes

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Proceedings Article | 29 August 2022 Poster

Preparing for system level AIV for METIS

Remko Stuik, Ted Huang, Dirk Lesman, Bernhard Brandl, Chad Salo, Shiang-Yu Wang, Thomas Bertram, Peter Bizenberger, Werner Laun, Silvia Scheithauer, Jean-Christophe Barriere, Phil Parr-Burman, Stephen Todd, Lucas Labadie, Monika Rutowska, Mercedes Filho, Antonio Amorim, Emilie Bouzerand, Adrian Glauser

Proceedings Volume 12184, 1218438 (2022) https://doi.org/10.1117/12.2629309

KEYWORDS: Telescopes, Imaging spectroscopy, Spectroscopy, Mid-IR, System integration, Spectrometer engineering, Optical instrument design, Large telescopes, Imaging systems

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Proceedings Article | 26 August 2022 Presentation + Paper

The VLTI Expertise Centres: providing user support and expanding the community

M. Filho

Proceedings Volume 12183, 121831R (2022) https://doi.org/10.1117/12.2635770

KEYWORDS: Interferometry, Observatories, Image restoration, Fourier transforms, Data modeling, Radio optics, Astronomical imaging, Stars, Optical interferometry, Databases

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Proceedings Article | 25 August 2022 Paper

Challenges to the assembly and integration of the WSS with METIS

M. Filho, A. Amorim, P. Garcia, F. Carvalho, R. da Costa, M. Ngando

Proceedings Volume 12187, 121871C (2022) https://doi.org/10.1117/12.2629390

KEYWORDS: Safety, Optical alignment, Mid-IR, Manufacturing, Adaptive optics, Spectrographs, Imaging systems, Earthquakes, Wavefronts, Wavefront sensors

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SPIE Journal Paper | 5 April 2021

Methods for the development of an alignment platform for an astronomical instrument with application to the METIS instrument at the ELT

André Boné, António Amorim, Mercedes Filho, Paulo J. Garcia

JATIS, Vol. 7, Issue 02, 028001, (April 2021) https://doi.org/10.1117/12.10.1117/1.JATIS.7.2.028001

KEYWORDS: Astronomy, Actuators, Telescopes, Solid modeling, James Webb Space Telescope, Earthquakes, Mid-IR, Curium, Mirrors, Computer aided design

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Proceedings Article | 13 December 2020 Poster + Paper

A mass optimized support and access structure for ESO's Mid-infrared E-ELT Imager and Spectrograph (METIS)

André Boné, António Amorim, Hener Rodrigues, Dirk Lesman, Mercedes Filho, Paulo Garcia

Proceedings Volume 11447, 114472W (2020) https://doi.org/10.1117/12.2562150

KEYWORDS: Human-computer interaction, Near field optics, Wavefronts, Spatial frequencies, Large telescopes, Mirrors, Telescopes, Diffraction, Imaging spectroscopy, Spectroscopes

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Proceedings Article | 13 December 2020 Poster + Paper

Challenges to the assembly and integration of the WSS with METIS

M. Filho, A. Amorim, P. Garcia, A. Boné, H. Rodrigues, M. Ngando

Proceedings Volume 11450, 114502A (2020) https://doi.org/10.1117/12.2561398

KEYWORDS: Mid-IR, Large telescopes, Imaging systems, Spectrographs, Manufacturing, Aerospace engineering

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Proceedings Article | 22 July 2010 Paper

Comparison between closure phase and phase referenced interferometric image reconstructions

Nuno Gomes, Paulo J. Garcia, Eric Thiébaut, Stéphanie Renard, Mercedes Filho

Proceedings Volume 7734, 773438 (2010) https://doi.org/10.1117/12.857146

KEYWORDS: Stars, Signal to noise ratio, Visibility, Image restoration, Interferometry, Reconstruction algorithms, Photometry, Data modeling, Phase interferometry, Image quality

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Proceedings Article | 28 July 2008 Paper

VSI: the VLTI spectro-imager

F. Malbet, D. Buscher, G. Weigelt, P. Garcia, M. Gai, D. Lorenzetti, J. Surdej, J. Hron, R. Neuhäuser, P. Kern, L. Jocou, J.-P. Berger, O. Absil, U. Beckmann, L. Corcione, G. Duvert, M. Filho, P. Labeye, E. Le Coarer, G. Li Causi, J. Lima, K. Perraut, E. Tatulli, E. Thiébaut, J. Young, G. Zins, A. Amorim, B. Aringer, T. Beckert, M. Benisty, X. Bonfils, A. Cabral, A. Chelli, O. Chesneau, A. Chiavassa, R. Corradi, M. De Becker, A. Delboulbé, G. Duchêne, T. Forveille, C. Haniff, E. Herwats, K.-H. Hofmann, J.-B. Le Bouquin, S. Ligori, D. Loreggia, A. Marconi, A. Moitinho, B. Nisini, P.-O. Petrucci, J. Rebordao, R. Speziali, L. Testi, F. Vitali

Proceedings Volume 7013, 701329 (2008) https://doi.org/10.1117/12.789710

KEYWORDS: Telescopes, Stars, Spectral resolution, Spatial resolution, Interferometry, Integrated optics, Space telescopes, Visibility, Image restoration, Signal to noise ratio

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The VLTI Spectro Imager (VSI) was proposed as a second-generation instrument of the Very Large Telescope Interferometer providing the ESO community with spectrally-resolved, near-infrared images at angular resolutions down to 1.1 milliarcsecond and spectral resolutions up to R = 12000. Targets as faint as K = 13 will be imaged without requiring a brighter nearby reference object; fainter targets can be accessed if a suitable reference is available. The unique combination of high-dynamic-range imaging at high angular resolution and high spectral resolution enables a scientific program which serves a broad user community and at the same time provides the opportunity for breakthroughs in many areas of astrophysics. The high level specifications of the instrument are derived from a detailed science case based on the capability to obtain, for the first time, milliarcsecond-resolution images of a wide range of targets including: probing the initial conditions for planet formation in the AU-scale environments of young stars; imaging convective cells and other phenomena on the surfaces of stars; mapping the chemical and physical environments of evolved stars, stellar remnants, and stellar winds; and disentangling the central regions of active galactic nuclei and supermassive black holes. VSI will provide these new capabilities using technologies which have been extensively tested in the past and VSI requires little in terms of new infrastructure on the VLTI. At the same time, VSI will be able to make maximum use of new infrastructure as it becomes available; for example, by combining 4, 6 and eventually 8 telescopes, enabling rapid imaging through the measurement of up to 28 visibilities in every wavelength channel within a few minutes. The current studies are focused on a 4-telescope version with an upgrade to a 6-telescope one. The instrument contains its own fringe tracker and tip-tilt control in order to reduce the constraints on the VLTI infrastructure and maximize the scientific return.

Proceedings Article | 28 July 2008 Paper

Science case for 1 mas spectro-imagining in the near-infrared

Paulo Garcia, Jean-Philippe Berger, Alessandro Marconi, Alexander Krivov, Andrea Chiavassa, Bernard Aringer, Brunella Nisini, Denis Defrére, Dimitri Mawet, Dieter Schertl, Eric Tatuli, Eric Thiébaut, Fabien Baron, Fabien Malbet, Gaspard Duchéne, Gerd Weigelt, Gilles Duvert, Gilles Henri, Hubert Klahr, Jean Surdej, Jean-Charles Augereau, Jean-François Claeskens, John Young, Josef Hron, Karine Perraut, Karl-Heinz Hofmann, Leonardo Testi, Margarida Cunha, Mercedes Filho, Michaël De Becker, Olivier Absil, Olivier Chesneau, Pierre Collette, Pierre-Olivier Petrucci, Ralph Neuhaeuser, Romano Corradi, Sónia Antón, Sebastian Wolf, Sebastian Hoenig, Stephanie Renard, Thierry Forveille, Thomas Beckert, Thomas Lebzelter, Tim Harries, Virginie Borkowski, Xavier Bonfils

Proceedings Volume 7013, 70134N (2008) https://doi.org/10.1117/12.789216

KEYWORDS: Stars, Telescopes, Spatial resolution, Planets, Galactic astronomy, Adaptive optics, Spectral resolution, Visibility, Interferometry, High dynamic range imaging

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We present the work developed within the science team of the Very Large Telescope Interferometer Spectro-Imager (VSI) during the Phase A studies. VSI aims at delivering ~ 1 milliarcsecond resolution data cubes in the near-infrared, with several spectral resolutions up to 12 000, by combining up to 8 VLTI telescopes. In the design of an instrument, the science case plays a central role by supporting the instrument construction decision, defining the top-level requirements and balancing design options. The overall science philosophy of VSI was that of a general user instrument serving a broad community. The science team addressed themes which included several areas of astrophysics and illustrated specific modes of operation of the instrument: a) YSO disks and winds; b) Multiplicity of young stars; c) Exoplanets; d) Debris disks; e) Stellar surface imaging; f) The environments of evolved stars; g) AGN tori; h) AGN's Broad Line Region; i) Supermassive black-holes; and j) Microlensing. The main conclusions can be summarized as follows: a) The accessible targets and related science are extremely sensitive to the instrument limiting magnitude; the instrument should be optimized for sensitivity and have its own fringe tracker. b) Most of the science cases are readily achievable with on-axis fringe tracking, off-axis fringe tracking enabling extra science. c) In most targets (YSOs, evolved stars and AGNs), the interpretation and analysis of circumstellar/nuclear dust morphology requires direct access to the gas via spectral resolved studies of emission lines, requiring at least a spectral resolution of 2 500. d) To routinely deliver images at the required sensitivity, the number of telescopes in determinant, with 6 telescopes being favored. e) The factorial increase in the number of closure phases and visibilities, gained in a single observation, makes massive surveys of parameters and related science for the first time possible. f) High dynamic range imaging and very high dynamic range differential closure phase are possible allowing the study of debris disks and characterization of pegasides. g) Spectro-imaging in the near-infrared is highly complementary to ALMA, adaptive optics and interferometric imaging in the thermal infrared.

Proceedings Article | 28 July 2008 Paper

Phase closure image reconstruction for future VLTI instrumentation

Mercedes Filho, Stephanie Renard, Paulo Garcia, Gilles Duvert, Eric Thiebaut, John Young, Olivier Absil, Jean-Phillipe Berger, Thomas Beckert, Sebastian Hoenig, Dieter Schertl, Gerd Weigelt, Leonardo Testi, Eric Tatuli, Virginie Borkowski, Michaël de Becker, Jean Surdej, Bernard Aringer, Joseph Hron, Thomas Lebzelter, Andrea Chiavassa, Romano Corradi, Tim Harries

Proceedings Volume 7013, 70133Z (2008) https://doi.org/10.1117/12.787877

KEYWORDS: Telescopes, Visibility, Image restoration, Interferometry, Astatine, Data modeling, Stars, Interferometers, Fourier transforms, Optical interferometry

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Proceedings Article | 28 July 2008 Paper

Phase referencing in optical interferometry

Mercedes Filho, Paulo Garcia, Gilles Duvert, Gaspard Duchene, Eric Thiebaut, John Young, Olivier Absil, Jean-Phillipe Berger, Thomas Beckert, Sebastian Hoenig, Dieter Schertl, Gerd Weigelt, Leonardo Testi, Eric Tatuli, Virginie Borkowski, Michaël de Becker, Jean Surdej, Bernard Aringer, Joseph Hron, Thomas Lebzelter, Andrea Chiavassa, Romano Corradi, Tim Harries

Proceedings Volume 7013, 70131F (2008) https://doi.org/10.1117/12.787908

KEYWORDS: Visibility, Image restoration, Optical interferometry, Image resolution, Stars, Telescopes, Radio optics, Interferometry, Signal to noise ratio, Fourier transforms

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Showing 5 of 13 publications

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