David Hernández Expósito

ORCID: 0000-0001-5961-1189
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About
Contact & Profiles
Research Areas
  • Solar and Space Plasma Dynamics
  • CCD and CMOS Imaging Sensors
  • Stellar, planetary, and galactic studies
  • Adaptive optics and wavefront sensing
  • Embedded Systems Design Techniques
  • Parallel Computing and Optimization Techniques
  • Astro and Planetary Science
  • Solar Radiation and Photovoltaics
  • Geomagnetism and Paleomagnetism Studies
  • Advanced Vision and Imaging
  • Interconnection Networks and Systems
  • Image Processing Techniques and Applications
  • Astronomical Observations and Instrumentation
  • Experimental Learning in Engineering
  • Computational Physics and Python Applications
  • Advanced Optical Imaging Technologies
  • Calibration and Measurement Techniques
  • Advanced Data Compression Techniques
  • Particle accelerators and beam dynamics
  • Advanced Data Storage Technologies
  • Ionosphere and magnetosphere dynamics
  • Radio Frequency Integrated Circuit Design
  • Advanced Image Processing Techniques
  • Magnetic confinement fusion research
  • Real-Time Systems Scheduling

Instituto de Astrofísica de Canarias
2020-2023

Universidad de La Laguna
2013-2022

Instituto de Astrofísica de Andalucía
2018-2020

Consejo Superior de Investigaciones Científicas
2020

S. K. Solanki J. C. del Toro Iniesta J. Woch A. Gandorfer J. Hirzberger and 95 more A. Álvarez‐Herrero T. Appourchaux V. Mártínez Pillet Isabel Pérez-Grande E. Sanchis-Kilders W. Schmidt José María Gómez H. Michalik W. Deutsch G. Fernández-Rico B. Grauf L. Gizon K. Heerlein M. Kolleck A. Lagg R. Meller Roland Müller U. Schühle J. Staub K. Albert Miguel Alvarez Copano U. Beckmann Joerg Bischoff D. Busse R. Enge S. Frahm D. Germerott L. Guerrero B. Löptien Thimo Meierdierks Dietmar Oberdorfer Ioanna Papagiannaki Sandeep Ramanath J. Schou Stephan Werner Dan Yang Andreas Zerr Matthias Bergmann Jan Bochmann J. Heinrichs S. S. Meyer M. Monecke Marc Ferenc Müller Meredith Sperling Daniel Álvarez García Beatriz Aparicio del Moral M. Balaguer Jiménez L. R. Bellot Rubio J. P. Cobos Carracosa F. Girela David Hernández Expósito M. Herranz P. Labrousse A. C. López Jiménez D. Orozco Suárez J. L. Ramos J.M. Barandiarán Laurent Bastide C. Campuzano María Cebollero B. Dávila A. Fernández-Medina Pilar García Parejo Daniel Garranzo-García H. Laguna Jerrad Martin R. Navarro Armonía Núñez Peral Miquel Royo Antonio Sánchez Manuel Silva-López I. Vera J. Villanueva J.-J. Fourmond Claudia Ruiz de Galarreta M. Bouzit Véronique Hervier Jean Christophe Le Clec'h N. Szwec Marc Chaigneau V. Buttice Carlos Domínguez-Tagle Anne Philippon P. Boumier Régis Le Cocguen G. Baranjuk Alexander Graham Bell T. Berkefeld J. Baumgartner F. Heidecke T. Maue E. Nakai T. Scheiffelen M. Sigwarth D. Soltau

This paper describes the Polarimetric and Helioseismic Imager on Solar Orbiter mission (SO/PHI), first magnetograph helioseismology instrument to observe Sun from outside Sun-Earth line. It is key meant address top-level science question: How does solar dynamo work drive connections between heliosphere? SO/PHI will also play an important role in answering other questions of Orbiter, as well hosting potential a rich return further science. measures Zeeman effect Doppler shift FeI 617.3nm...

10.1051/0004-6361/201935325 article EN cc-by Astronomy and Astrophysics 2019-07-26
A. Lagg A. Gandorfer S. K. Solanki J. C. del Toro Iniesta Yukio Katsukawa and 95 more P. N. Bernasconi Thomas Berkefeld A. Feller T. L. Riethmüller A. Álvarez‐Herrero Masahito Kubo V. Mártínez Pillet H. N. Smitha D. Orozco Suárez B. Grauf M. P. Carpenter Alexander Graham Bell María-Teresa Álvarez-Alonso Daniel Álvarez García Beatriz Aparicio del Moral Daniel Ayoub F. J. Bailén Eduardo Bailón Martínez M. Balaguer Jiménez P. Barthol Montserrat Bayon Laguna L. R. Bellot Rubio M. Bergmann J. Blanco Rodríguez Jan Bochmann J. M. Borrero Antonio Campos-Jara J. S. Castellanos Durán María Cebollero A. Rodríguez W. Deutsch H. Eaton A. Fernández-Medina G. Fernández-Rico A. Ferreres Andrés García Ramón María García Alarcia Pilar García Parejo Daniel Garranzo-García J. L. Gasent Blesa K. Gerber D. Germerott Dean L. Palmer L. Gizon Miguel Angel Gómez Sánchez-Tirado David González Alejandro Gonzalo Melchor Sam Goodyear Hirohisa Hara Edvarda Harnes K. Heerlein F. Heidecke J. Heinrichs David Hernández Expósito J. Hirzberger Johannes Hoelken Sangwon Hyun F. A. Iglesias Ryohtaroh T. Ishikawa Minwoo Jeon Yusuke Kawabata M. Kolleck H. Laguna Derek Lomas A. C. López Jiménez Paula Manzano Takuma Matsumoto David Mayo Turrado Thimo Meierdierks Stefan Meining Markus Monecke José Miguel Morales-Fernández Antonio J. Moreno Mantas A. Moreno Vacas Marc Ferenc Müller Reinhard Müller Yoshiyuki Naito E. Nakai Armonía Núñez Peral Takayoshi Oba Geoffrey Palo Isabel Pérez-Grande Javier Piqueras Carreño Tobias Preis Damien Przybylski C. Quintero Noda Sandeep Ramanath J. L. Ramos N. E. Raouafi María-Jesús Rivas-Martínez P. Martinez Manuel Rodríguez Valido B. Ruiz Cobo A Rodríguez Antonio Sánchez Gómez

In July 2024, Sunrise completed its third successful science flight. The III observatory had been upgraded significantly after the two previous flights in 2009 and 2013. Three completely new instruments focus on small-scale physical processes their complex interaction from deepest observable layers photosphere up to chromospheric heights. Previously poorly explored spectral regions lines are exploited paint a three-dimensional picture of solar atmosphere with unprecedented completeness level...

10.48550/arxiv.2502.06483 preprint EN arXiv (Cornell University) 2025-02-10

Plenoptic cameras are a new type of sensor that extend the possibilities current commercial allowing 3D refocusing or capture depths. One limitations plenoptic is their limited spatial resolution. In this paper we describe fast, specialized hardware implementation super-resolution algorithm for cameras. The has been designed field programmable graphic array (FPGA) devices using VHDL (very high speed integrated circuit (VHSIC) description language). With technology, obtain an acceleration...

10.3390/s140508669 article EN cc-by Sensors 2014-05-16

This article describes the implementation of a web server using an embedded Altera NIOS II IP core, general purpose and configurable RISC processor which is in Cyclone FPGA. The uses μCLinux operating system to support Boa dynamic pages Common Gateway Interface (CGI). FPGA configured act like master node network, also control monitor network smart sensors or instruments. In order develop totally functional system, includes time-triggered protocol (TTP/A). Thus, implemented has two...

10.3390/s140100416 article EN cc-by Sensors 2013-12-27

A frequent problem arising for deep space missions is the discrepancy between amount of data desired to be transmitted ground and available telemetry bandwidth. part these consists scientific observations, being complemented by calibration help remove instrumental effects. We present our solution this discrepancy, implemented Polarimetric Helioseismic Imager on-board Solar Orbiter mission, first solar spectropolarimeter in space. an reduction system that processes data, applies them raw...

10.1117/1.jatis.6.4.048004 article EN cc-by Journal of Astronomical Telescopes Instruments and Systems 2020-12-18

Designing a new astronomical instrument typically challenges the available cameras on market. In many cases, no camera can fulfill requirements of in terms photon budget, speed, and even interfaces with rest instrument. this situation, only options are to either downgrade performance or design from scratch, provided it is possible identify compliant detector. The latter case SPGCams, developed be used Tunable Magnetograph (TuMag) Sunrise Chromospheric Infrared spectroPolarimeter (SCIP) for...

10.3389/fspas.2023.1167540 article EN cc-by Frontiers in Astronomy and Space Sciences 2023-05-09

The Sunrise chromospheric infrared spectropolarimeter (SCIP) installed in the international balloon experiment sunrise iii will perform spectropolarimetric observations near-infrared band to measure solar photospheric and magnetic fields simultaneously. main components of SCIP for polarization measurements are a rotating wave plate, beam splitters, CMOS imaging sensors. In each sensors, records orthogonal linearly polarized light. is later demodulated on-board. Each sensor covers one two...

10.1364/ao.472516 article EN publisher-specific-oa Applied Optics 2022-10-20

In this paper we describe the teaching methodology of subject Design Electronic Systems using FPGA. The is eminently practical, with a continuous evaluation and final project in which students have to perform real digital design. This larger than micro-designs they are introduced new concepts that make up first part subject. number was small has encouraged implementation used.

10.1109/taee.2016.7528238 article EN 2016-06-01

The SUNRISE project has been conceived as a solar observatory to investigate the physics processes in lower atmosphere of our Sun. With this aim, III mission incorporates two new instruments, TuMag and SCIP, part its scientific payload. These instruments generate considerable amount data produced by 4 Mpixel sensors running up 32 fps during around seven days. captured must be stored for later analysis on ground. In order accomplish storage an efficient way, tailored version CCSDS 121.0-B-2...

10.1109/dcis55711.2022.9970132 article EN 2022-11-16

In this paper we present a novel FPGA implementation of the Consultative Committee for Space Data Systems Image Compression (CCSDS-IDC 122.0-B-1) performing image compression aboard Polarimetric Helioseismic Imager instrument ESA's Solar Orbiter mission. This is System-On-Chip solution based on light multicore architecture combined with an efficient ad-hoc Bit Plane Encoder core. hardware performs acceleration ~30 times respect to software running into space-qualified processors, like LEON3....

10.1117/12.2312701 article EN 2018-07-06

The extension of on-board data processing capabilities is an attractive option to reduce telemetry for scientific instruments on deep space missions. challenges that this presents, however, require a comprehensive software system, which operates the limited resources unit in allows. We implemented such system Polarimetric and Helioseismic Imager (PHI) Solar Orbiter (SO) spacecraft. It ensures autonomous operation handle long command-response times, easy changing processes after new lessons...

10.1117/12.2311718 preprint EN 2018-07-06

This work presents a prototype camera that has been used in research project and is intended to be as teaching resource. The most relevant parts of the instrument are an image sensor Artix-7 FPGA. development firmware FPGA several items concerning design methodology based on this technology. Thus, possibility using resource constitutes opportunity for students learn technology with real current device developed leading astrophysical mission.

10.1109/taee46915.2020.9163668 article EN 2020-07-01

The super-resolution algorithm was first implemented in FPGA the context of a project master Engineering Electronics. This is multidisciplinary project, as has been required, by student, basic knowledge optics, Matlab programming, image processing, fixed point arithmetic, and design methodology based on VHDL-FPGA.

10.1109/taee.2014.6900153 article EN 2014-06-01

Terms like "connectivity" have a variety of meanings and connotations in the realm tactical communications. The author attempts to define what is entailed "net-centric connectivity" sets out explore technology options support interoperability for communication links currently service on military airborne platforms. Both U.S. domestic international communities are recognizing importance interfacing between modern legacy systems - internet-protocol (IP) non-IP-based networks. contends that...

10.1109/milcom.2007.4455253 article EN 2007-10-01

The Sunrise missions consist of observing the magnetic field sun continuously for a few days from stratosphere. In these missions, balloon supporting telescope and associated instrumentation, including Tunable Magnetograph (TuMag), is lifted into camera this instrument, image sensor sends its data to Field Programmable Gate Array (FPGA) using eight transmission channels. These channels must be previously calibrated correct delivery image. For mission, FPGA has been exchanged newer larger...

10.3390/s22062078 article EN cc-by Sensors 2022-03-08

The TuMag instrument is a Tunable Magnetograph that has been designed to measure the magnetic field of sun. This and others will be connected telescope sent into stratosphere using balloon for an uninterrupted observation sun four days in summer 2022. camera new development implementing image detector instrument. It based on GPIXEL GSENSE400-BSI scientific CMOS sensor FPGA device charge controlling sensor, configuring it grabbing images. consists array Configurable Logic Blocks. However,...

10.3390/electronics10141706 article EN Electronics 2021-07-16

The Sunrise Chromospheric Infrared spectroPolarimeter (SCIP) has been developed for the third flight of balloon-borne stratospheric solar observatory. aim SCIP is to reveal evolution three-dimensional magnetic fields in photosphere and chromosphere using spectropolarimetric measurements with a polarimetric precision 0.03% (1σ). Multiple lines 770 850 nm wavelength bands are simultaneously observed two 2 k × CMOS cameras at frame rate 31.25 Hz. Stokes profiles calculated onboard by...

10.1117/1.jatis.9.3.034003 article EN cc-by Journal of Astronomical Telescopes Instruments and Systems 2023-07-31

Measuring magnetic fields in the inner corona, interface between solar chromosphere and outer is of paramount importance if we aim to understand energetic transformations taking place there, because it at origin processes that lead coronal heating, wind acceleration, most phenomena relevant space weather. However, these measurements are more difficult than mere imaging polarimetry requires differential photometry. The magnetograph mission (CMAG) has been designed map vector field,...

10.3390/aerospace10120987 article EN cc-by Aerospace 2023-11-23

The Sunrise Chromospheric Infrared spectroPolarimeter (SCIP) has been developed for the third flight of SUNRISE balloon-borne stratospheric solar observatory. aim SCIP is to reveal evolution three-dimensional magnetic fields in photosphere and chromosphere using spectropolarimetric measurements with a polarimetric precision 0.03\% (1$\sigma$). Multiple lines 770 850 nm wavelength bands are simultaneously observed two 2k$\times$2k CMOS cameras at frame rate 31.25 Hz. Stokes profiles...

10.48550/arxiv.2307.16551 preprint EN cc-by arXiv (Cornell University) 2023-01-01

The main objective of this paper is to present the design and implementation an embedded controlling system for Tunable Magnetograph (TuMag) instrument camera sensor test-bench software application laboratory characterization. TuMag based on a new scientific GPIXEL SENSE400 device family equipped with FPGA. has active area 2048 × pixels reaches frame rate up 48 frames per second. was implemented Artix 7 FPGA, which oversees image through configuration interface. It controls read-out data...

10.3390/electronics12194071 article EN Electronics 2023-09-28

Measuring magnetic fields in the inner corona, interface between solar chromosphere and outer is of paramount importance if we aim at understanding energetic transformations taking place there which origin processes that lead to coronal heating, wind acceleration, most phenomena relevant space weather. However, these measurements are more difficult than mere imaging because polarimetry requires differential photometry. The Coronal Magnetograph mission (CMAG) has been designed map vector...

10.20944/preprints202310.1715.v1 preprint EN 2023-10-26

We present the radiative transfer equation (RTE) inverter core, a high performance SIMD architecture, to interpret data obtained by Polarimetric and Magnetic field Imager (PMI) instrument aboard ESA's Vigil mission. After some pre-processing, spectropolarimetric will be translated on board into physical quantities of solar atmosphere directly downloaded Earth, hence strongly reducing telemetry needs such deep space The RTE is direct heritage from that in Helioseismic (PHI) ESA/NASA's Solar...

10.23919/edhpc59100.2023.10396356 article EN 2023-10-02

In this contribution we present a multi-core system-on-chip, embedded on FPGA, for real-time data processing, to be used in the Daniel K. Inouye Solar Telescope (DKIST). Our system will provide "quick-look" magnetic field vector and line-of-sight velocity maps help solar physicists react specific events or features during observations address phenomena while analyzing off line. The stand-alone device installed at National Observatory (NSO) Data Center. It integrated processing pipeline...

10.1117/12.2312569 article EN 2018-07-06
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