Mr. Javier Moreno-Ventas Profile

Javier Moreno-Ventas

at ATG Europe

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Author

Publications (6)

Proceedings Article | 12 July 2023 Open Access

ALTIUS instrument: a study of scattering effects

J. Moreno-Ventas, W. Moelans, A. Mazzoli, L. Aballea, P. Blain, E. Mazy, L. Clermont, N. Saillen, L. Montrone, M. Francois

Proceedings Volume 12777, 127771N (2023) https://doi.org/10.1117/12.2689672

KEYWORDS: Stray light, Polarizers, Acoustooptic tunable filters, Equipment, Ultraviolet radiation, Design and modelling, Mirrors, Astronomical imaging, Optical design, Optical surfaces

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ALTIUS is the next ESA limb-sounding mission for monitoring of stratospheric ozone at high vertical resolution and of NOx molecules and aerosols. With a platform based on the PROBA-NEXT concept flying in a Sun-Synchronous orbit, the data provided by the ALTIUS Mission will support the scientific community addressing key questions related to atmospheric chemistry composition and climate changes. The ALTIUS Instrument features wavelength-tuning capabilities in the UV (250-355nm), VIS (440-675 nm) and NIR (600-1020) bands using a Fabry-Perot interferometer (FPI) stack in the UV band and an Acousto-Optic Tunable Filter technologies (AOTF) in the VIS and NIR bands. This Instrument topology allows ALTIUS to perform 2D imaging with high resolution in the vertical profile of the Earth limb. The optical layout of 2D imagers, characterized by a more extensive field of view (FOV), makes them more susceptible to stray light issues in comparison to more conventional optical designs such as grating systems. These particular design aspects in combination with the use of novel technologies (FPI’s and AOTF’s) and the irradiance distribution of the observed bright limb scenes makes the stray light prediction very interesting and complex. An accurate modelling of scatter contributors involving optical and mechanical surfaces is, therefore, required. Due to the cost-effective model philosophy applied for the ALTIUS Instrument, no hardware model is available for stray light correlation purposes prior to the Instrument Proto-flight. Hence, a study was performed to benchmark the stray light analyses results obtained with Optic Studio with the ones obtained with FRED. This paper provides a description of the optical modelling features of the ALTIUS Instrument with specific attention to the novel optical devices, AOTF and FPI stack. It also addresses the particularities and differences observed when modelling the Instrument using two different commercial optical design suites. A comparison of scattered stray light computations for the ALTIUS Instrument ran in OpticStudio and FRED is also presented highlighting reflections on modelling approach and used mathematical models, with an outlook on consistency at L1. Finally, lessons learned from this exercise are presented along with the conclusions and plans for future work. Additional presentation content can be accessed on the supplemental content page.

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Proceedings Article | 11 July 2018 Paper

The MICADO first light imager for the ELT: preliminary design of the MICADO Calibration Assembly

G. Rodeghiero, J.-U. Pott, N. Münch, R.-R. Rohloff, U. Grözinger, E. Biancalani, M. Sawczuck, M. Häberle, J. Moreno-Ventas, S. Schäfer, U. Seemann, V. Naranjo, S. Barboza, F. Müller, R. Hofferbert, J. Ramos, L. Mohr, M. C. Cárdenas Vázquez, P. Bizenberger, C. Pernechele, M. Ebert, M. Fabricius

Proceedings Volume 10702, 107028U (2018) https://doi.org/10.1117/12.2311721

KEYWORDS: Calibration, Lamps, Prototyping, Manufacturing, Light sources, Sensors, Mirrors, Imaging spectroscopy, Adaptive optics, Telescopes

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Proceedings Article | 9 August 2016 Paper

Final integration and alignment of LINC-NIRVANA

Javier Moreno-Ventas , Peter Bizenberger, Thomas Bertram, Kalyan Radhakrishnan, Frank Kittmann, Harald Baumeister, Luca Marafatto, Lars Mohr, Tom Herbst

Proceedings Volume 9908, 99082Y (2016) https://doi.org/10.1117/12.2231690

KEYWORDS: Telescopes, Mirrors, Sensors, Calibration, Integrated optics, Collimators, Interferometers, Selenium, Cameras, Collimation

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The LBT (Large Binocular Telescope), located at about 3200m on Mount Graham (Tucson, Arizona) is an innovative project undertaken by institutions from Europe and USA. LINC-NIRVANA is an instrument which provides MCAO (Multi-Conjugate Adaptive Optics) and interferometry, combining the light from the two 8.4m telescopes coherently. This configuration offers 23m-baseline optical resolution and the sensitivity of a 12m mirror, with a 2 arc-minute diffraction limited field of view. The integration, alignment and testing of such a big instrument requires a well-organized choreography and AIV planning which has been developed in a hierarchical way. The instrument is divided in largely independent systems, and all of them consist of various subsystems. Every subsystem integration ends with a verification test and an acceptance procedure. When a certain number of systems are finished and accepted, the instrument AIV phase starts. This hierarchical approach allows testing at early stages with simple setups. The philosophy is to have internally aligned subsystems to be integrated in the instrument optical path, and extrapolate to finally align the instrument to the Gregorian bent foci of the telescope. The alignment plan was successfully executed in Heidelberg at MPIA facilities, and now the instrument is being re-integrated at the LBT over a series of 11 campaigns along the year 2016. After its commissioning, the instrument will offer MCAO sensing with the LBT telescope. The interferometric mode will be implemented in a future update of the instrument. This paper focuses on the alignment done in the clean room at the LBT facilities for the collimator, camera, and High-layer Wavefront Sensor (HWS) during March and April 2016. It also summarizes the previous work done in preparation for shipping and arrival of the instrument to the telescope. Results are presented for every step, and a final section outlines the future work to be done in next runs until its final commissioning.

Proceedings Article | 27 July 2016 Paper

CIAO: wavefront sensors for GRAVITY

Silvia Scheithauer, Wolfgang Brandner, Casey Deen, Tobias Adler, Henri Bonnet, Pierre Bourget, Fanny Chemla, Yann Clenet, Francoise Delplancke, Monica Ebert, Frank Eisenhauer, Michael Esselborn, Gert Finger, Eric Gendron, Adrian Glauser, Frederic Gonte, Thomas Henning, Stefan Hippler, Armin Huber, Zoltan Hubert, Gerd Jakob, Lieselotte Jochum, Laurent Jocou, Sarah Kendrew, Ralf Klein, Johann Kolb, Martin Kulas, Werner Laun, Rainer Lenzen, Marcus Mellein, Eric Müller, Javier Moreno-Ventas, Udo Neumann, Sylvain Oberti, Jürgen Ott, Laurent Pallanca, Johana Panduro, Jose Ramos, Miguel Riquelme, Ralf-Rainer Rohloff, Gérard Rousset, Nicolas Schuhler, Marcos Suarez, Gerard Zins

Proceedings Volume 9909, 99092L (2016) https://doi.org/10.1117/12.2232997

KEYWORDS: Wavefront sensors, Telescopes, Adaptive optics, Observatories, Infrared telescopes, Stars, Infrared sensors, Wavefront sensors, Infrared telescopes, Infrared radiation, Sensors, Mirrors

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Proceedings Article | 8 July 2014 Paper

Optical integration and verification of LINC-NIRVANA

J. Moreno-Ventas, H. Baumeister, Thomas Bertram, P. Bizenberger, F. Briegel, D. Greggio, F. Kittmann, L. Marafatto, L. Mohr, K. Radhakrishnan, H. Schray

Proceedings Volume 9147, 91473V (2014) https://doi.org/10.1117/12.2057456

KEYWORDS: Telescopes, Mirrors, Collimators, Integrated optics, Interferometers, Interferometry, Wavefronts, Fermium, Frequency modulation, Optical alignment

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Proceedings Article | 8 July 2014 Paper

LINC-NIRVANA: Diffraction limited optics in cryogenic environment

Peter Bizenberger, Harald Baumeister, Patrick Fopp, Tom Herbst, Werner Laun, Lars Mohr, Javier Moreno-Ventas

Proceedings Volume 9147, 91474B (2014) https://doi.org/10.1117/12.2057473

KEYWORDS: Mirrors, Point spread functions, Telescopes, Interferometry, Sensors, Optics manufacturing, Cryogenics, Diffraction, Charge-coupled devices, Wavefronts

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