Mr. Simone Nordera Profile

Simone Nordera

at CNR-Istituto di Fotonica e Nanotecnologie

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Publications (9)

Proceedings Article | 23 August 2024 Poster + Paper

Characterization of the polarizing filters for the EnVisS camera

Carmen Naletto, Paolo Chioetto, Simone Nordera, Mirco Zaccariotto, Paola Zuppella, Vania Da Deppo

Proceedings Volume 13092, 130927K (2024) https://doi.org/10.1117/12.3021121

KEYWORDS: Polarizers, Polarization, Optical filters, Reflectivity, Comets, Cameras, Signal detection, Equipment

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The Comet Interceptor mission has been adopted by the European Space Agency (ESA) Science Programme Committee in June 2022 as the first ”F” mission in the Science Programme. The aim of the mission is to increase the knowledge on comets and on the Solar System formation by encountering and exploring a Dynamically New Comet (DNC) or an Interstellar Object (ISO) originating at another star. EnVisS (Entire Visible Sky) is an all-sky camera designed to fly on Comet Interceptor and whose scientific task is to study the radiance and the polarization properties of the comet coma in the visible spectrum. The camera is composed of an optical head, a filter strip assembly and a detector. The Institute for Photonics and Nanotechnologies (CNR-IFN) of Padova and Leonardo SpA (Campi BisenzioFlorence) are in charge of the design of the filter package, which currently consists of three filter strips glued side by side. The central strip is a high transmission broadband (BB) filter in the range 550–800 nm with no polarization properties, while the side ones are linear polarization filters with the same transmission bandpass as the BB and with polarization axis at 45° from one another. In the CNR-IFN laboratories different types of polarizers have been tested to establish which one has the most fitting properties for EnVisS’s purposes. The analyzed filters are Moxtek Visible Light Polarizer RCV8N2EC and Ultra BroadBand Polarizer UBB01A, and Polarcor Wide Band Polarizer. For each type of polarizing filter, both transmissivity and reflectivity have been measured and compared both with those of the other filters as well as data provided by the manufacturer. Overall, measurements of the filters’ transmissivity and reflectivity agree with those provided by the supplier and mostly fit EnVisS’ purposes. Thanks to its optimal performance and the fused silica substrate, Moxtek UBB01A is considered the best candidate filter for the instrument between the polarizers that have been characterized.

Proceedings Article | 12 July 2023 Open Access

Characterization of polarizing filters for the EnVisS camera: procedure and results

Simone Nordera, Vania Da Deppo, Paola Zuppella, Paolo Chioetto

Proceedings Volume 12777, 127775X (2023) https://doi.org/10.1117/12.2691104

KEYWORDS: Tunable filters, Optical filters, Polarizers, Comets, Equipment, Cameras, Space operations, Polarization, Mirrors, Astronomical imaging

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Proceedings Article | 12 July 2023 Open Access

Out-of-focus point sources image simulation for the Metis solar coronagraph onboard the Solar Orbiter mission

Vania Da Deppo, Chiara Casini, Paolo Chioetto, Fabio Frassetto, Simone Nordera, Paola Zuppella, Alain Corso, Federico Landini, Maurizio Pancrazzi, Roberto Susino, Clementina Sasso, Michela Uslenghi, Marco Romoli, Vincenzo Andretta, Silvano Fineschi, Giampiero Naletto, Gianalfredo Nicolini, Daniele Spadaro, Marco Stangalini, Luca Teriaca, Lucia Abbo, Catia Grimani, Aleksandr Burtovoi, Yara De Leo, Michele Fabi, Federica Frassati, Giovanna Jerse, Giuliana Russano

Proceedings Volume 12777, 1277764 (2023) https://doi.org/10.1117/12.2691114

KEYWORDS: Equipment, Coronagraphy, Particles, Vignetting, Telescopes, Shadows, Mirrors, Ultraviolet radiation, Astronomical imaging, Sun

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Metis is a multi-wavelength coronagraph onboard the European Space Agency (ESA) Solar Orbiter mission. Thanks to the selected Solar Orbiter mission profile, for the first time the poles of the Sun and the circumsolar region will be seen and studied from a privileged point of view near the Sun (minimum distance 0.28 AU). Metis features an innovative instrument design conceived for simultaneously imaging the visible (580-640 nm) and ultraviolet (Lyman α at 121.6 nm) emission of the solar corona. METIS is an externally occulted coronagraph which adopts an “inverted occulted” configuration. The inverted external occulter (IEO) is a circular aperture after which a spherical mirror M0 rejects back the solar disk light, which exits the instrument through the IEO aperture itself. The passing coronal light is then collected by the METIS telescope. Common to both channels, the Gregorian on-axis telescope is centrally occulted and both the primary and the secondary mirrors have annular shape. The optical and radiometric performance of the telescope is strongly dependent on the huge degree of vignetting presented by the optical design. The internal fields are highly vignetted by M0 and further vignetted by the internal elements, such as the internal occulter and the Lyot stop, furthermore the presence of some spiders, needed to mount the internal elements, are vignetting even more, in some parts of the FoV, the light beams. During the instrument commissioning, in the visible light channel some out-of-focus sources have been imaged while moving in the Metis FoV. At a first glance, the out-of-focus images exhibit a very strange pattern. The pattern can be explained by taking into account the peculiar design of the Metis coronagraph instrument; in fact, the not fully illuminated pupil gives rise to “half moon” shape out-of-focus images with the spiders casting their shadow in different positions. In this work, the ray-tracing simulation results for the out-of-focus images are compared with some of the images taken in flight; some considerations relating the shape and dimension of the acquired images with the distance from Metis of the sources are also given.

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Proceedings Article | 12 July 2023 Open Access

Design of the EnVisS instrument optical head

Beatrice Tofani, Riccardo Gabrieli, Giuseppe Impiccichè, Chiara Graziosi, Leonardo Tommasi, Demetrio Labate, Fabio Belli, Chiara Cicciarelli, Claudio Pernechele, Paola Zuppella, Paolo Chioetto, Simone Nordera, Geraint Jones, George Brydon, Anamarija Stankov, Vincenzo Della Corte, Vania Da Deppo

Proceedings Volume 12777, 127772P (2023) https://doi.org/10.1117/12.2690282

KEYWORDS: Head, Equipment, Design and modelling, Comets, Distortion, Lenses, Astronomical imaging, Polarization, Optical transmission, Silica

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Proceedings Article | 27 August 2022 Poster + Paper

Ghost analysis of the EnVisS camera for the Comet Interceptor ESA mission

Simone Nordera, Vania Da Deppo, Paola Zuppella, Paolo Chioetto, Vincenzo Della Corte, Claudio Pernechele, Umberto Barozzi, Riccardo Gabrieli, Giuseppe Impiccichè, Demetrio Labate, Beatrice Tofani, Leonardo Tommasi

Proceedings Volume 12180, 1218036 (2022) https://doi.org/10.1117/12.2629473

KEYWORDS: Ray tracing, Radiometry, Sensors, Optical filters, Comets, Cameras, Transmittance, Filtering (signal processing), Reflectivity, Reflection, Space operations, Polarizers

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Proceedings Article | 11 June 2021 Open Access

Test of protected silver coating on aluminum samples of ARIEL main telescope mirror substrate material

Paolo Chioetto, Paola Zupella, Vania Da Deppo, Simone Nordera, Emanuele Pace, Andrea Tozzi, Gianluca Morgante, Luca Terenzi, Daniele Brienza, Nadia Missaglia, Giovanni Bianucci, Sebastiano Spinelli, Elisa Guerriero, Massimiliano Rossi, Gabriele Grisoni, Colin Bondet, Grégory Chauveau, Caroline Porta, Catherine Grezes-Besset, Giuseppe Malaguti, Giuseppina Micela

Proceedings Volume 11852, 118524L (2021) https://doi.org/10.1117/12.2599794

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Proceedings Article | 11 June 2021 Open Access

Methodology for the analysis of a thermo-mechanically deformed optical system

Simone Nordera, Paolo Chioetto, Paola Zuppella, Emanuele Pace, Gianluca Morgante, Andrea Tozzi, Ciro del Vecchio, Antonio Scippa, Giuseppina Micela, Vania Da Deppo

Proceedings Volume 11852, 1185250 (2021) https://doi.org/10.1117/12.2599824

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Proceedings Article | 11 June 2021 Open Access

The fisheye of the comet interceptor's EnVisS camera

Claudio Pernechele, Vania Da Deppo, Luca Consolaro, Geraint Jones, George Brydon, Paola Zuppella, Paolo Chioetto, Simone Nordera, Luisa Maria Lara, Andris Slavinskis

Proceedings Volume 11852, 118524V (2021) https://doi.org/10.1117/12.2599817

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Proceedings Article | 13 December 2020 Poster + Paper

The optical head of the EnVisS camera for the Comet Interceptor ESA mission: phase 0 study

Vania Da Deppo, Claudio Pernechele, Geraint Jones, George Brydon, Paola Zuppella, Paolo Chioetto, Simone Nordera, Alessandra Slemer, Giuseppe Crescenzio, Emanuele Piersanti, Paolo Spanò, Gino Bucciol, Luca Consolaro, Luisa Lara, Andris Slavinskis

Proceedings Volume 11443, 1144379 (2020) https://doi.org/10.1117/12.2562907

KEYWORDS: Comets, Cameras, Space operations, Head, Monochromatic aberrations, Remote sensing, Optical filters, Polarizers, Imaging systems, Optical design

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