Mr. Flávio F. Ribeiro Profile

Flávio F. Ribeiro

at Lab Nacional de Astrofisica

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Author

Publications (5)

Proceedings Article | 7 August 2014 Paper

Temperature control system for optical elements in astronomical instrumentation

Orlando Verducci, Antonio de Oliveira, Flávio Ribeiro, Márcio Vital de Arruda, Clemens Gneiding, Luciano Fraga

Proceedings Volume 9151, 91514E (2014) https://doi.org/10.1117/12.2056608

KEYWORDS: Control systems, Sensors, Optical components, Resistors, Spectrographs, Palladium, Temperature metrology, Lenses, Chemical elements, Software development

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Proceedings Article | 7 August 2014 Paper

Slit device for FOCCoS-PFS-Subaru

Antonio Cesar de Oliveira, James Gunn, Ligia Souza de Oliveira, Marcio Vital de Arruda, Lucas Souza Marrara, Leandro Henrique dos Santos, Décio Ferreira, Jesulino Bispo dos Santos, Josimar Aparecido Rosa, Flavio Felipe Ribeiro, Rodrigo de Paiva Vilaça, Orlando Verducci, Laerte Sodré, Claudia Mendes Oliveira

Proceedings Volume 9151, 91514D (2014) https://doi.org/10.1117/12.2056400

KEYWORDS: Composites, Optical fibers, Spectrographs, Polishing, Prototyping, Silicon, Nickel, Structured optical fibers, Sensors, Temperature metrology

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The Fiber Optical Cable and Connector System, ”FOCCoS”, subsystem of the Prime Focus Spectrograph, “PFS”, for Subaru telescope, is responsible to feed four spectrographs with a set of optical fibers cables. The light injection for each spectrograph is assured by a convex curved slit with a linear array of 616 optical fibers. In this paper we present a design of a slit that ensures the right direction of the fibers by using masks of micro holes. This kind of mask is made by a technique called electroforming, which is able to produce a nickel plate with holes in a linear sequence. The precision error is around 1-μm in the diameter and 1-μm in the positions of the holes. This nickel plate may be produced with a thickness between 50 and 200 microns, so it may be very flexible. This flexibility allows the mask to be bent into the shape necessary for a curved slit. The concept requires two masks, which we call Front Mask, and Rear Mask, separated by a gap that defines the thickness of the slit. The pitch and the diameter of the holes define the linear geometry of the slit; the curvature of each mask defines the angular geometry of the slit. Obviously, this assembly must be mounted inside a structure rigid and strong enough to be supported inside the spectrograph. This structure must have a CTE optimized to avoid displacement of the fibers or increased FRD of the fibers when the device is submitted to temperatures around 3 degrees Celsius, the temperature of operation of the spectrograph. We have produced two models. Both are mounted inside a very compact Invar case, and both have their front surfaces covered by a dark composite, to reduce stray light. Furthermore, we have conducted experiments with two different internal structures to minimize effects caused by temperature gradients. This concept has several advantages relative to a design based on Vgrooves, which is the classical option. It is much easier and quicker to assemble, much cheaper, more accurate, easier to adjust; and it also offers the possibility of making a device much more strong, robust and completely miniaturized.

Proceedings Article | 28 July 2014 Paper

Studying focal ratio degradation of optical fibers for Subaru's Prime Focus Spectrograph

Jesulino Bispo dos Santos, Antonio Cesar de Oliveira, James Gunn, Ligia Souza de Oliveira, Marcio Vital de Arruda, Bruno Castilho, Clemens Darvin Gneiding, Flavio Felipe Ribeiro, Graham Murray, Daniel Reiley, Laerte Sodré Junior, Claudia Mendes de Oliveira

Proceedings Volume 9151, 915150 (2014) https://doi.org/10.1117/12.2056460

KEYWORDS: Spectrographs, Optical fibers, Cameras, Fiber optics, Telescopes, Sensors, Optical fiber cables, Optical testing, Manufacturing, Connectors

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Proceedings Article | 21 July 2010 Paper

Mechanical design of SIFS SOAR integral field unit spectrograph

Vanessa B. Macanhan, Fernando Santoro, Clemens Gneiding, Antonio de Oliveira, Fernando Lourenço, Beatriz Barbuy, Jacques R. Lépine, Militäo Figueiredo, Paulo Silva, Bruno Castilho, Flavio Ribeiro, Marcio de Arruda, Arturo Gutierrez, Luiz Zambretti, Francisco Rodrigues, Henrique Di Pintor Da Luz, José da Silva

Proceedings Volume 7735, 77356R (2010) https://doi.org/10.1117/12.856593

KEYWORDS: Spectrographs, Optical fibers, Telescopes, Collimators, Cameras, Mechanical engineering, Astronomy, Connectors, Mirrors, Microlens

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Proceedings Article | 23 July 2008 Paper

The LNA VPH characterization experiment

Flávio Ribeiro, Orlando Katime-Santrich, Clemens Gneiding, Bruno Castilho, Rodrigo Campos, Rogério Nicolau

Proceedings Volume 7018, 70184V (2008) https://doi.org/10.1117/12.789513

KEYWORDS: Diffraction gratings, Diffraction, Spectrographs, Telescopes, Optical filters, Holography, Astronomy, Charge-coupled devices, CCD cameras, Wavefronts

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