Mr. Fernando Salgado Profile

Fernando Salgado

Engineer at European Southern Observatory

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Author

Publications (11)

Proceedings Article | 11 September 2024 Poster + Paper

20 years of experience maintaining the encoders in the Very Large Telescope at Paranal Observatory

Fernando Salgado, Rodrigo Huerta, Juan Carlos Pineda, Eduardo Garcés, Nicolás Alvarez, Juan Carlos Palacios, José Figueroa, Pascual Rojas, José Báez, Víctor Cea, Maxime Boccas

Proceedings Volume 13094, 1309447 (2024) https://doi.org/10.1117/12.3019917

KEYWORDS: Head, Telescopes, Calibration, Observatories, Equipment, Design, Large telescopes, Control systems, Inspection

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More than 20 years have already passed since the first light of Antu, the Very Large Telescope (VLT) Unit 1 at Paranal Observatory on 25th of May 1998. Encoders are key parts of the control of axes like Altitude, Azimuth, Adapters and Rotators in all the telescopes, where absolute encoders are used to get an accurate measurement of the position, at the level of micrometer. The intention of this document is to summarize and show some problems we had in these years, some modifications and suggestion to improve the design in order to avoid those problems. We also present some new applications of encoders to measure speed instead of position. A typical problem in the Adapters is analyzed, given that the encoder tape is located too close to the bearing it easily gets dirty, forcing our Maintenance Support and Engineering Department (MSE) to dismount the attached instrument and the whole Adapter Rotator getting access to clean its encoder system, with the consequent risk of losing operation time. Same issue is shown in Auxiliary telescopes, GRAAL Co-rotator and the European antenna in ALMA. All the encoder heads in the Adapters and Rotators were modified to avoid damage in the encoder tape, a change of a damaged tape was needed in 2005 and was done for the first time at ESO. A new design of the encoder head support is shown for both Altitude and Azimuth, which provides a fine and accurate way to adjust them. They have been installed in UT4 Azimuth and UT3 Altitude axes. A new design for Azimuth encoder tape is suggested to improve its robustness against variations of height in the hydraulic bearing system. Preventive, Condition-based, Corrective, and “Predictive” Maintenance applied to encoder systems are commented. The Obsolescence is analyzed. And a special case related with Calibration of encoders is also discussed. The integration of encoder signals to the axes plays a pivotal role in the deployment of a cutting-edge control system for the primary axes, Altitude and Azimuth. These encoders not only accurately gauge position but also serve to measure velocity during the encoder initialization phase and provide high-precision commutation information for the power amplifiers. This further enhances precision and efficiency.

Proceedings Article | 25 July 2024 Presentation + Paper

Update on maintenance processes and performance of technical operations at the Paranal Observatory

M. Boccas, G. Blanchard, P. Campana, V. Cea, A. Doberti, I. Ferreira, J. P. Gil, S. Gonzalez, I. Kastinen, M. Ortega, F. Salgado, M. Tapia, J. Valenzuela

Proceedings Volume 13098, 1309804 (2024) https://doi.org/10.1117/12.3019424

KEYWORDS: Equipment, Telescopes, Reliability, Observatories, Failure analysis, Statistical analysis, Astronomical instrumentation, Process engineering, Efficient operations

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Proceedings Article | 18 July 2024 Poster + Paper

Infrastructure upgrade of Antu, Kueyen, and Melipal for the implementation of laser guide stars for the GRAVITY+ project

Michael Tucker Booth, Malte Scherbarth, Frédéric Gonté, Jose Antonio Abad, Bernardo Aguilera, Patricio Alarcon, Iván Alvarez, Luis Alvial, Eduardo Atton, Alexis Beltran, Israel Barraza, Pablo Barriga, Helen Bedigan, Christopher Binimelis, Oscar Briones, Rodrigo Candia, Luis Caniguante, Robin Capocci, Cesar Cardenas, Danissa Cardenas, Abdón Chala, Reinaldo Contreras, Ralf Conzelmann, Alain Delboulbé, Francoise Delplancke, Juan Diaz, Alejandro Doberti, Max Engelhardt, Jorge Fernandez, Eloy Fuenteseca, Fernando Garcia, Christian Garrido, Paul Garrido, Iván Guidolin, Pablo Gutierrez, Ronald Guzman, Wolfgang Hackenberg, Yerko Juica, Jean-Paul Kirchbauer, Demostenes Kirkmann, Peter Krempl, Juan Lorenzo, Alfredo Mella, Jhorvis Meza, Felipe Miranda, Sebastian Nunes, Sylvain Oberti, Francisco Olivares, Mario Opazo, Miguel Riquelme, Jordán Rivera, Miguel Robles, Fernando Salgado, Sylvain Rochat, Edson Rojas, Nicolas Schuler, Izzy Tambay, Richard Tamblay, Esteban Unmanzor, Herman Vega, Francisco Villanueva, Ricardo Whilem, Julien Woillez, Juan Zúñiga, Luis Zúñiga

Proceedings Volume 13096, 130969A (2024) https://doi.org/10.1117/12.3020005

KEYWORDS: Safety, Telescopes, Laser guide stars, Mirrors, Equipment, Large telescopes, Astronomical interferometers, Observatories

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Proceedings Article | 13 December 2020 Presentation + Paper

VLTI status update: tapping into a powerful second-generation instrumentation

Xavier Haubois, Roberto Abuter, Emmanuel Aller-Carpentier, Jaime Alonso, Juan Beltran, Jean-Philippe Berger, Pierre Bourget, Paul Bristow, Luis Caniguante, Bruno Chazelas, Claudia Cid, Ralf Conzelmann, Angela Cortes, Pascaline Darré, Alain Delboulbé, Françoise Delplancke-Ströbele, Diego Del Valle, Roderick Dembet, Reinaldo Donoso, Christophe Dupuy, Sebastien Egner, Frank Eisenhauer, Lorena Faundez, Eloy Fuenteseca, Robert Frahm, Daniel Gaytan, Juan Pablo Gil, Andreas Glindemann, Frédéric Gonté, Jaime Gonzales, Patricia Guajardo, Thibaut Guerlet, Sylvain Guieu, Pablo Gutierrez, Pierre Haguenauer, Pierre van der Heyden, Stefan Huber, Norbert Hubin, Christian Hummel, Lieselotte Jochum, Laurent Jocou, Jean-Paul Kirchbauer, Johann Kolb, Johan Kosmalski, Peter Krempl, Sylvestre Lacour, Jean-Baptiste Le Bouquin, Julien Leclercq, Jean Louis Lizon, Bruno Lopez, Yves Magnard, Anthony Meilland, Alexander Meister, Antoine Mérand, Steffen Mieske, Thibaut Moulin, Juan Osorio, Jürgen Ott, Claudia Paladini, Laurent Pallanca, Marcus Pavez, Luca Pasquini, Célia Pelluet, Isabelle Percheron, Lorenzo Pettazzi, Andrés Pino, Sébastien Poupar, Andrés Ramírez, Javier Reyes, Miguel Riquelme, Thomas Rivinius, Sylvain Rochat, Fernando Salgado, Markus Schöller, Nicolas Schuhler, Pavel Shchekaturov, Christian Stephan, Marcos Suarez, Alain Smette, Richard Tamblay, Mario Tapia, Konrad Tristram, Guillermo Valdes, Christophe Verinaud, Markus Wittkowski, Julien Woillez, Gérard Zins

Proceedings Volume 11446, 1144606 (2020) https://doi.org/10.1117/12.2561486

KEYWORDS: Telescopes, Adaptive optics, Space operations

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Proceedings Article | 10 July 2018 Presentation + Paper

Technical operations and maintenance activities at the Paranal Observatory

M. Boccas, E. Diaz, M. Frantz, S. Gonzalez, G. Hüdepohl, I. Kastinen, V. Nurzia, P. Pozzobon, C. Ramirez, C. Reinero, F. Salgado, C. Stephan, J. Valenzuela

Proceedings Volume 10704, 107041Y (2018) https://doi.org/10.1117/12.2311769

KEYWORDS: Telescopes, Observatories, Failure analysis, Inspection, Reliability, Efficient operations

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Proceedings Article | 9 July 2018 Paper

VLTI status update: three years into the second generation

Julien Woillez, Pascaline Darré, Sebastien Egner, Frédéric Gonté, Xavier Haubois, Antoine Mérand, Nicolas Schuhler, José Antonio Abad, Roberto Abuter, Emmanuel Aller-Carpentier, Jaime Alonso, Luigi Andolfato, Pablo José Barriga, Juan Beltran, Jean-Philippe Berger, Pierre Bourget, Roland Brast, Paul Bristow, Luis Caniguante, Ralf Conzelmann, Angela Cortes, Alain Delboulbé, Françoise Delplancke-Ströbele, Diego Del Valle, Roderick Dembet, Frédéric Derie, Reinaldo Donoso, Philippe Duhoux, Christophe Dupuy, Andreas Förster, Eloy Fuenteseca, Robert Frahm, Daniel Gaytan, Andreas Glindemann, Jaime Gonzales, Thibaut Guerlet, Sylvain Guieu, Stéphane Guisard, Pablo Gutierrez, Pierre Haguenauer, Andreas Haimerl, Pierre van der Heyden, Stefan Huber, Norbert Hubin, Lieselotte Jochum, Laurent Jocou, Paul Jolley, Jean-Paul Kirchbauer, Johann Kolb, Johan Kosmalski, Peter Krempl, Jean-Baptiste Le Bouquin, Samuel Lévêque, Paul Lilley, Jean Louis Lizon, Yves Magnard, Pedro Mardones, Alexander Meister, Thibaut Moulin, Juan Osorio, Jürgen Ott, Laurent Pallanca, Jérôme Paufique, Marcus Pavez, Luca Pasquini, Isabelle Percheron, Lorenzo Pettazzi, Thanh Phan Duc, Jean Francois Pirard, Andres Pino, Sébastien Poupar, Jutta Quentin, Andres Ramírez, Javier Reyes, Robert Ridings, Sylvain Rochat, Thomas Rivinius, Fernando Salgado, Markus Schöller, Pavel Shchekaturov, Christian Stephan, Marcos Suarez, Richard Tamblay, Mario Tapia, Konrad Tristram, Guillermo Valdes, Christophe Verinaud, Willem-Jan de Wit, Gérard Zins

Proceedings Volume 10701, 1070103 (2018) https://doi.org/10.1117/12.2312042

KEYWORDS: Telescopes, Adaptive optics, Metrology, Interferometers, Stars

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Proceedings Article | 4 August 2016 Paper

VLT interferometer upgrade for the 2nd generation of interferometric instruments

Frederic Gonté, Julien Woillez, Nicolas Schuhler, Sebastian Egner, Antoine Merand, José Antonio Abad, Sergio Abadie, Roberto Abuter, Margarita Acuña, Fatmé Allouche, Jaime Alonso, Luigi Andolfalto, Pierre Antonelli, Gerardo Avila, Pablo José Barriga, Juan Beltran, Jean-Philippe Berger, Carlos Bolados, Henri Bonnet, Pierre Bourget, Roland Brast, Paul Bristow, Luis Caniguante, Roberto Castillo, Ralf Conzelmann, Angela Cortes, Françoise Delplancke, Diego Del Valle, Frederic Derie, Alvaro Diaz, Reinaldo Donoso, Reinhold Dorn, Philippe Duhoux, Christophe Dupuy, Frank Eisenhauer, Christian Elao, Eloy Fuenteseca, Ruben Fernandez, Daniel Gaytan, Andreas Glindemann, Jaime Gonzales, Sylvain Guieu, Stephane Guisard, Pierre Haguenauer, Andreas Haimerl, Volker Heinz, Juan Pablo Henriquez, P. van der Heyden, Norbert Hubin, Rodrigo Huerta, Lieselotte Jochum, Alfredo Leiva, Samuel Lévêque, Jean-Louis Lizon, Fernando Luco, Pedro Mardones, Angel Mellado, Juan Osorio, Jürgen Ott, Laurent Pallanca, Marcus Pavez, Luca Pasquini, Isabelle Percheron, Jean-Francois Pirard, Duc Than Phan, Juan Carlos Pineda, Andres Pino, Sebastien Poupar, Andres Ramírez, Claudio Reinero, Miguel Riquelme, Juan Romero, Thomas Rivinius, Chester Rojas, Felix Rozas, Fernando Salgado, Silvia Scheithauer, Christian Schmid, Markus Schöller, Waldo Siclari, Christian Stephan, Richard Tamblay, Mario Tapia, Konrad Tristram, Guillermo Valdes, Willem-Jan de Wit, Andrew Wright, Gerard Zins

Proceedings Volume 9907, 99071Z (2016) https://doi.org/10.1117/12.2233350

KEYWORDS: Interferometry, Adaptive optics, Telescopes, Interferometers, Stars, Infrared radiation, Interferometry, Astatine, Mirrors, Mid-IR, Sensors

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Proceedings Article | 27 July 2016 Paper

Ten years maintaining MACAO-VLTI units in operation in the Very Large Telescope at Paranal Observatory

F. Salgado, G. Hudepohl

Proceedings Volume 9909, 99092T (2016) https://doi.org/10.1117/12.2231795

KEYWORDS: Observatories, Space telescopes, Large telescopes, Adaptive optics, Telescopes, Avalanche photodetectors, Mirrors, Connectors, Deformable mirrors, Real-time computing

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Proceedings Article | 18 July 2014 Paper

Design, fabrication, integration and commissioning of an upgraded guiding probe for the VLT unit telescope 4

Christoph Frank, Peter Hammersley, Bernard Buzzoni, Antonio Manescau, Robin Arsenault, Pierre-Yves Madec, Martin Birkmann, Michael Mueller, Fernando Salgado, Stephane Guisard, Matthias Kroedel

Proceedings Volume 9151, 915111 (2014) https://doi.org/10.1117/12.2055868

KEYWORDS: Mirrors, Telescopes, Space telescopes, Sensors, Manufacturing, Cameras, Aluminum, Wavefronts, Wavefront sensors, Optical instrument design

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Proceedings Article | 13 September 2012 Paper

Success of long-term preventive maintenance on telescope subsystems using the example of the VLT adapter-rotators at the ESO Paranal Observatory

F. Salgado, J. Haddad, G. Hudepohl, R. Medina

Proceedings Volume 8448, 844825 (2012) https://doi.org/10.1117/12.925163

KEYWORDS: Telescopes, Computer programming, Head, Optical fibers, Sensors, Observatories, Electronics, Mirrors, CCD image sensors, Charge-coupled devices

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Proceedings Article | 25 October 2004 Paper

Interferometric fringes with MACAO-VLTI corrected starlight and VINCI

Robin Arsenault, Pierre Kervella, Rob Donaldson, Markus Kasper, Enrico Fedrigo, Anders Wallander, Markus Schoeller, Nico Housen, Francoise Delplancke, Fernando Salgado, Christophe Dupuy, Norbert Hubin, Liviu Ivanescu, Sylvain Oberti, Jerome Paufique, Silvio Rossi, Markus Wittkowski

Proceedings Volume 5490, (2004) https://doi.org/10.1117/12.552574

KEYWORDS: Adaptive optics, Interferometry, Mirrors, Calibration, Sensors, Electrodes, Interferometers, Deformable mirrors, Telescopes, Optical fibers

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Showing 5 of 11 publications

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