Dr. Jose Javier Valenzuela Profile

Dr. Jose Javier Valenzuela

Instrumentation Engineer - Paranal Observatory at European Southern Observatory

SPIE Involvement:

Author

Area of Expertise:

Adaptive Optics , CCD/IR Detectors , FPGA/DSP programming , Power Electronics

Publications (14)

Proceedings Article | 15 September 2022 Poster + Paper

Automated identification of the status of deformable mirror actuators with machine learning

Leonardo Blanco, Natalie Behara, Javier Valenzuela, Markus Kasper

Proceedings Volume 12185, 121856B (2022) https://doi.org/10.1117/12.2629436

KEYWORDS: Actuators, Optical spheres, Coronagraphy, Point spread functions, Deformable mirrors, Observatories, Machine learning, Data acquisition, Adaptive optics, Wavefront sensors

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Proceedings Article | 29 August 2022 Paper

CRIRES+: characterisation and preparation during the pandemic

Paul Bristow, Andrea Baruffolo, Jonathan Smoker, Florian Rodler, Reinhold Dorn, Claudio Cumani, Derek Ives, Yves Jung, Thomas Marquart, Christophe Moins, Mark Neeser, Ernesto Oliva, Jérôme Paufique, Nikolai Piskunov, Ricardo Schmutzer, Ulf Seemann, Ditte Slumstrup, Jose Javier Valenzuela

Proceedings Volume 12184, 121845X (2022) https://doi.org/10.1117/12.2630207

KEYWORDS: Metrology, Sensors, Calibration, Lamps, Observatories, Staring arrays, Optical alignment, Fabry–Perot interferometers, Spectrographs

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Proceedings Article | 29 August 2022 Presentation + Paper

CRIRES+ on sky: high spectral resolution at infrared wavelength enabling better science at the ESO VLT

Reinhold Dorn, Paul Bristow, Jonathan Smoker, Florian Rodler, Matteo Accardo, Andrea Baruffolo, Claudio Cumani, Andreas Haimerl, Artie Hatzes, Marcus Haug, Ulrike Heiter, Renate Hinterschuster, Norbert Hubin, Derek Ives, Matias Jones, Yves Jung, Jean-Paul Kirchbauer, Barbara Klein, Jana Köhler, Heidi Korhonen, Alexis Lavail, Thomas Marquart, Christophe Moins, Ignacio Molina-Conde, Ernesto Oliva, Laurent Pallanca, Luca Pasquini, Jerome Paufique, Nikolai Piskunov, Ansgar Reiners, Dominik Schneller, Ricardo Schmutzer, Ulf Seemann, Ditte Slumstrup, Alain Smette, Jörg Stegmeier, Eric Stempels, Sebastien Tordo, Elena Valenti, Jose Javier Valenzuela, Joel Vernet

Proceedings Volume 12184, 121841F (2022) https://doi.org/10.1117/12.2629969

KEYWORDS: Sensors, Calibration, Adaptive optics, Stars, Spectral resolution, Spectrographs, Mirrors, K band, Infrared radiation, Polarization

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Proceedings Article | 10 July 2018 Presentation + Paper

An on-line turbulence profiler for the AOF: on-sky results

Andrés Guesalaga, Johann Kolb, Robert Donaldson, Javier Valenzuela, Sylvain Oberti, Benoit Neichel, Jérôme Paufique, Pierre-Yves Madec

Proceedings Volume 10703, 107032D (2018) https://doi.org/10.1117/12.2313246

KEYWORDS: Turbulence, Adaptive optics, Telescopes, Stars, Atmospheric optics, Real-time computing, Calibration, Tomography, Profiling, Error analysis

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The ESO’s adaptive optics facility (AOF) is ending its commissioning at Paranal (Chile). It feeds two second-generation instruments of the VLT-UT4 telescope, HAWK-I and MUSE, with turbulence corrected wavefronts through the GALACSI and GRAAL modules. The main features of the AOF are its deformable secondary mirror with 1170 actuators and a laser asterism of 4 artificial stars that probe the atmosphere via four high-resolution Shack-Hartmann wavefront sensors (WFS), each with 40x40 subapertures. The system provides ground layer adaptive optics (GLAO) and laser tomography adaptive optics (LTAO) capabilities. In order to support the commissioning phases of the project, and later optimize and diagnose the operation of the system, a turbulence profiler has been developed and installed in SPARTA, the AOF real time controller (RTC). The profiler estimates two key turbulence parameters: the C_n ²(h) and the outer scale (L₀(h)) profiles and no limit on the number of the estimated layers exists, but for eight layers, the method takes about 2 minutes to yield a full characterization of the atmosphere. The maximum line of sight distance that the profiler can probed the atmosphere depends on the star separation defined for each operation mode: 3km for GRAAL; 14 km for GALACSI wide field and over 35km for GALACS narrow field mode. The remaining turbulence above these maxima (unseen turbulence from the undetected layers) are essential in the GRAAL mode and it is reliably estimated thanks to a novel method to determine the noise in the WFSs, which is mandatory for estimating this upper segment of the turbulence. The technique is also useful to alert about operational problems such as dome seeing and mis-registrations. The method is currently installed in the SPARTA RTC, providing continuous online estimations for the GALACSI (narrow and wide field modes), and for GRAAL mode. Results for several nights comprising hundreds of profiles show very good agreement with other independent measurements.

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 | 4 August 2016 Paper

Analysis and comparison of the atmospheric parameters retrieved from a Ex-AO instrument with the astroclimatic monitoring system

Juan Carlos Guerra, Julio Navarrete, J. Valenzuela, J.-F. Sauvage, T. Fusco, K. Dohlen

Proceedings Volume 9909, 990937 (2016) https://doi.org/10.1117/12.2233802

KEYWORDS: Adaptive optics, Atmospheric optics, Wavefront sensors, Turbulence, Atmospheric monitoring, Optical spheres, Observatories, Environmental sensing, Wind measurement, Meteorology

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Proceedings Article | 3 August 2016 Paper

Performance updates of HAWK-I and preparation for the commissioning of the system GRAAL+HAWK-I

Pascale Hibon, Jerome Paufique, Harald Kuntschner, Danuta Dobrzycka, Miska Le Louarn, Elena Valenti, Mark Neeser, Emanuela Pompei, Robin Arsenault, Ralf Siebenmorgen, Pierre-Yves Madec, Monika Petr-Gotzens, Carlos La Fuente, Josefina Urrutia, Javier Valenzuela, Roberto Castillo, Pedro Baksai, Cesar Enrique Garcia Dabo, Andreas Jost, Javier Argomedo, Johann Kolb, Mario Kiekebusch, Norbert Hubin, Philippe Duhoux, Ralf Dieter Conzelmann, Robert Donaldson, Sebastien Tordo, Stefan Huber

Proceedings Volume 9908, 99080F (2016) https://doi.org/10.1117/12.2231305

KEYWORDS: Adaptive optics, Imaging systems, K band, Adaptive optics, Stars, Sensors, Galactic astronomy, Point spread functions, Telescopes, Calibration, Spatial resolution

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Proceedings Article | 27 July 2016 Paper

GRAAL on the mountaintop

Jérôme Paufique, Pierre-Yves Madec, Johann Kolb, Harald Kuntschner, Javier Argomedo, Mario Kiekebusch, Robert Donaldson, Robin Arsenault, Ralf Siebenmorgen, Christian Soenke, Sebastien Tordo, Ralf Conzelmann, Andreas Jost, Javier Reyes-Moreno, Mark Downing, Pascale Hibon, Jose Javier Valenzuela, Pierre Haguenauer

Proceedings Volume 9909, 99092H (2016) https://doi.org/10.1117/12.2232826

KEYWORDS: Adaptive optics, Imaging systems, Observatories, Stars, Sensors, Telescopes, Mirrors, Cameras, Real-time computing, Relays

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Proceedings Article | 27 July 2016 Paper

Laboratory results of the AOF system testing

Johann Kolb, Pierre-Yves Madec, Robin Arsenault, Sylvain Oberti, Jérôme Paufique, Paolo La Penna, Stefan Ströbele, Robert Donaldson, Christian Soenke, Marcos Suárez Valles, Mario Kiekebusch, Javier Argomedo, Miska Le Louarn, Elise Vernet, Pierre Haguenauer, Philippe Duhoux, Emmanuel Aller-Carpentier, Jose Javier Valenzuela, Juan Carlos Guerra

Proceedings Volume 9909, 99092S (2016) https://doi.org/10.1117/12.2232788

KEYWORDS: Deformable mirrors, Mirrors, Adaptive optics, Telescopes, Stars, Turbulence, Laser guide stars, Infrared radiation, Wavefront sensors, Infrared imaging

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Proceedings Article | 11 July 2016 Paper

SystMon: a data visualization tool for the analysis of telemetry data

Juan Carlos Guerra, Christian Stephan, Eduardo Pena, Javier Valenzuela, Juan Osorio

Proceedings Volume 9910, 991021 (2016) https://doi.org/10.1117/12.2233331

KEYWORDS: Observatories, Calibration, Iterated function systems, Optical spheres, Sensors, Optical filtering, Stars, Polarimetry, Control systems, K band

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Proceedings Article | 21 July 2014 Paper

Turbulence profiling methods applied to ESO's adaptive optics facility

Javier Valenzuela, Clémentine Béchet, Aurea Garcia-Rissmann, Frédéric Gonté, Johann Kolb, Miska Le Louarn, Benoît Neichel, Pierre-Yves Madec, Andrés Guesalaga

Proceedings Volume 9148, 91481X (2014) https://doi.org/10.1117/12.2054740

KEYWORDS: Adaptive optics, Turbulence, Wavefront sensors, Stars, Error analysis, Telescopes, Photons, Deconvolution, Statistical analysis, Gemini Observatory

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Proceedings Article | 24 September 2012 Paper

The VIMOS upgrade programme

Peter Hammersley, Hans Dekker, Fernando Selman, Paul Bristow, Pierre Bourget, Roland Brast, Roberto Castillo, Mark Downing, Cesar Garcia-Dabo, Nicholas Haddad, Michael Hilker, Carlo Izzo, Jean-Louis Lizon, Christian Lucuix, Vincenzo Mainieri, Steffen Mieske, Dan Popovic, Claudio Reinero, Marina Rejkuba, Chester Rojas, Ruben Sanchez-Janssen, Alain Smette, Josefina Urrutia Del Rio, Javier Valenzuela, Burkhard Wolff

Proceedings Volume 8446, 84465M (2012) https://doi.org/10.1117/12.925132

KEYWORDS: Sensors, Camera shutters, Molybdenum, Calibration, Spectroscopy, Spectroscopes, Charge-coupled devices, Imaging spectroscopy, Quantum efficiency, Visible radiation

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Proceedings Article | 21 July 2010 Paper

Instrumentation at Paranal Observatory: maintaining the instrument suite of five large telescopes and its interferometer alive

Gordon Gillet, José Luis Alvarez, Juan Beltrán, Pierre Bourget, Roberto Castillo, Álvaro Diaz, Nicolás Haddad, Alfredo Leiva, Pedro Mardones, Jared O'Neal, Mauricio Ribes, Miguel Riquelme, Pascal Robert, Chester Rojas, Javier Valenzuela

Proceedings Volume 7735, 77355U (2010) https://doi.org/10.1117/12.856218

KEYWORDS: Observatories, Telescopes, Instrumentation engineering, Cameras, Cryogenics, Large telescopes, Interferometers, Optical spheres, Control systems, Sensors

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Proceedings Article | 28 June 2006 Paper

The REMIR cryogenics restyling

F. Vitali, J. L. Lizon, G. Ihle, M. Accardo, L. Gonzales, P. Sinclaire, J. Pineda, A. Pizarro, J. Valenzuela, P. Conconi, F. D'Alessio, V. De Caprio, M. Riva, E. Molinari, G. Chincarini, F. Zerbi, M. Rodonò, S. Covino, V. Testa, G. Tosti, L. Antonelli, G. Malaspina, E. Palazzi

Proceedings Volume 6269, 626954 (2006) https://doi.org/10.1117/12.671197

KEYWORDS: Cryogenics, Cameras, Telescopes, Cryocoolers, Observatories, Copper, Nitrogen, Imaging systems, Control systems, Near infrared

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Showing 5 of 14 publications

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