Dr. Paolo Sandri Profile

Dr. Paolo Sandri

Optical Engineer at OHB System AG

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Author

Publications (12)

Proceedings Article | 12 July 2023 Open Access

Metrological setups for the optical characterization of highly compact, large aperture, fast, diffraction limited freeform telescopes and the use of the Helmholtz-Lagrange Invariant as a criterion to assess optical design robustness

P. Sandri, A. Boni, M. Deiml, M. Erhard, M. Freudling, P. Muraro, T. Sedlmaier

Proceedings Volume 12777, 1277749 (2023) https://doi.org/10.1117/12.2690681

KEYWORDS: Telescopes, Tolerancing, Freeform optics, Design and modelling, Geometrical optics, Astronomical imaging, Distortion, Monochromatic aberrations, Optical design, Mirrors

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Proceedings Article | 28 October 2022 Poster + Paper

Constraining the parameter space for robust in-orbit refocusing of TDI-based imaging systems

Nicola Baccichet, Florian Richter, Paolo Sandri

Proceedings Volume 12264, 122640L (2022) https://doi.org/10.1117/12.2636122

KEYWORDS: Calibration, Modulation transfer functions, Error analysis, Satellites, Statistical analysis, Target detection, Signal to noise ratio, Sensors, Satellite imaging

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Proceedings Article | 11 June 2021 Open Access

FLEX low resolution spectrometer breadboard activities

A. Altbauer, P. Sandri, D. Lang, L. Pettinato, R. Gabrieli, P. Coppo, M. Taccola, Davide Nuzzi

Proceedings Volume 11852, 1185266 (2021) https://doi.org/10.1117/12.2600226

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Proceedings Article | 12 July 2019 Open Access

A lightweight Schmidt space telescope configuration for ultra-high energy cosmic ray detection

Vania Da Deppo, Paolo Sandri, Piero Mazzinghi, Alessandro Zuccaro Marchi

Proceedings Volume 11180, 1118071 (2019) https://doi.org/10.1117/12.2536172

KEYWORDS: Telescopes, Mirrors, Observatories, Atmospheric particles, Atmospheric Cherenkov telescopes, Space telescopes, Cameras, Spatial resolution, Luminescence, Fresnel lenses

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One of the most challenging open questions of modern astrophysics and particle physics is the determination of the origins and the production mechanisms of the Ultra-High Energy Cosmic Rays (UHECR), i.e. particles with energy above the Greisen–Zatsepin–Kuzmin (GZK) limit, which is about 5×10¹⁹ eV.

UHECRs can be studied in two ways: either via direct detection of the secondary particles, i.e. extensive air shower (EAS), produced by UEHRCs interaction with the atmosphere, or by observing during night the track of the UV fluorescence emitted by EAS. The origin direction of the cosmic rays can be therefore determined.

While ground-based observatories are already operative, different optical configurations, based mainly on the Schmidt camera layout or double Fresnel lenses concept, can be envisaged for future space-based ones. Both solutions faced in the past technological issues: transmission and resolution at large field angles for Fresnel lenses and weight of the primary mirror for the Schmidt. However, recent advances in the technology of ultra-lightweight, large and deployable active mirrors made the Schmidt camera approach feasible, becoming the preferred option.

This work describes a lightweight Schmidt space telescope design for UHECRs detection conceived for a mission intended to orbit at 600 km altitude.

The instrument concept is a fast, high-pixelized, large aperture and large Field-of-View (FoV) digital camera, working in the near-UV wavelength range with single photon counting capability. The telescope will record the track of an EAS with a time resolution of 2.5 μs and a spatial resolution of about 0.6 km (corresponding to ~ 4’), thus allowing the determination of energy and direction of the primary particles.

The proposed design has about 50° FoV and a 4.2 m entrance pupil diameter. The mirror is 7.5 m in diameter, it is deployable and segmented to fit the diameter of the considered launcher fairing (i.e. Ariane 6.2). The Schmidt corrector plate is a lightweight annular corona.

This configuration provides a polychromatic angular resolution less than 4' RMS over the whole FoV with a very fast relative aperture, i.e. F/# 0.7. Thanks to its very large pupil and large FoV, the design could be fit for a space-based observatory, thus enhancing the science achievable with respect to the presently operating ground-based counterparts, such as Telescope Array and Auger. A key advantage of this catadioptric design over the classic all refractive adopted in the past is the higher attainable global throughput. This parameter guarantees to reach and fulfil the required instrument photon collection specifications.

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Proceedings Article | 12 July 2019 Open Access

Design study of a hosted Arctic imager for weather and climate monitoring in the polar regions

Peter Buschkamp, Stephan Gulde, Charlotte Bewick, Patrick Tully Peacocke, Paolo Sandri, Frank te Hennepe

Proceedings Volume 11180, 111804W (2019) https://doi.org/10.1117/12.2536095

KEYWORDS: Calibration, Mirrors, Telescopes, Sensors, Infrared telescopes, Modulation transfer functions, Signal to noise ratio, Near infrared, Manufacturing, Imaging systems

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SPIE Journal Paper | 25 January 2018

Stray-light analyses of the multielement telescope for imaging and spectroscopy coronagraph on Solar Orbiter

Paolo Sandri, Silvano Fineschi, Marco Romoli, Matteo Taccola, Federico Landini, Vania Da Deppo, Giampiero Naletto, Danilo Morea, Denis Naughton, Ester Antonucci

OE, Vol. 57, Issue 01, 015108, (January 2018) https://doi.org/10.1117/12.10.1117/1.OE.57.1.015108

KEYWORDS: Imaging spectroscopy, Sun, Mirrors, Telescopes, Coronagraphy, Ultraviolet radiation, Sensors, Information operations, Stray light analysis, Space telescopes

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Proceedings Article | 29 August 2017 Presentation + Paper

Optical measurements of the mirrors and of the interferential filter of the Metis coronagraph on Solar Orbiter

P. Sandri, P. Sarra, P. Radaelli, D. Morea, R. Melich, A. Berlicki , E. Antonucci, M. Castronuovo, S. Fineschi, G. Naletto, G. Nicolini, M. Romoli

Proceedings Volume 10397, 1039716 (2017) https://doi.org/10.1117/12.2275416

KEYWORDS: Mirrors, Wavefronts, Wavefront sensors, Interferometers, Coronagraphy, Spherical lenses, Ultraviolet radiation, Sun, Optical filters, Integrated optics

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SPIE Journal Paper | 11 December 2015 Open Access

ADAHELI+: exploring the fast, dynamic Sun in the x-ray, optical, and near-infrared

Francesco Berrilli, Paolo Soffitta, Marco Velli, Paolo Sabatini, Alberto Bigazzi, Ronaldo Bellazzini, Luis Ramon Bellot Rubio, Alessandro Brez, Vincenzo Carbone, Gianna Cauzzi, Fabio Cavallini, Giuseppe Consolini, Fabio Curti, Dario Del Moro, Anna Di Giorgio, Ilaria Ermolli, Sergio Fabiani, Marianne Faurobert, Alex Feller, Klaus Galsgaard, Szymon Gburek, Fabio Giannattasio, Luca Giovannelli, Johann Hirzberger, Stuart Jefferies, Maria Madjarska, Fabio Manni, Alessandro Mazzoni, Fabio Muleri, Valentina Penza, Giovanni Peres, Roberto Piazzesi, Francesca Pieralli, Ermanno Pietropaolo, Valentín Martinez Pillet, Michele Pinchera, Fabio Reale, Paolo Romano, Andrea Romoli, Marco Romoli, Alda Rubini, Pawel Rudawy, Paolo Sandri, Stefano Scardigli, Gloria Spandre, Sami Solanki, Marco Stangalini, Antonio Vecchio, Francesca Zuccarello

JATIS, Vol. 1, Issue 04, 044006, (December 2015) https://doi.org/10.1117/12.10.1117/1.JATIS.1.4.044006

KEYWORDS: Solar processes, Magnetism, X-rays, Sun, Polarimetry, Mirrors, X-ray optics, Satellites, Telescopes, Space telescopes

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Proceedings Article | 25 September 2015 Paper

Stray-light analyses of the METIS coronagraph on Solar Orbiter

S. Fineschi, P. Sandri, F. Landini, M. Romoli, V. DaDeppo, F. Frassetto, E. Verroi, G. Naletto, D. Morea, E. Antonucci, D. Spadaro, V. Andretta

Proceedings Volume 9604, 96040K (2015) https://doi.org/10.1117/12.2203629

KEYWORDS: Ultraviolet radiation, Sensors, Mirrors, Telescopes, Information operations, Diffraction, Coronagraphy, Zemax, Sun, Space telescopes

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Proceedings Article | 7 January 2015 Paper

Numerical simulation of deformation and figure quality of precise mirror

Tomáš Vit, Radek Melich, Paolo Sandri

Proceedings Volume 9442, 94421F (2015) https://doi.org/10.1117/12.2176336

KEYWORDS: Mirrors, Adhesives, Numerical simulations, Finite element methods, 3D modeling, Tolerancing, Zerodur, Optics manufacturing, Optical mounts, Mirror pointing

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Proceedings Article | 8 October 2011 Paper

High spectral resolution imager for solar induced fluorescence observation

A. Barducci, D. Guzzi, C. Lastri, P. Marcoionni, V. Nardino, I. Pippi, V. Raimondi, P. Sandri

Proceedings Volume 8175, 81750G (2011) https://doi.org/10.1117/12.898225

KEYWORDS: Luminescence, Spectral resolution, Sensors, Spectroscopy, Imaging systems, Staring arrays, Fluorescence spectroscopy, Vegetation, Satellites, Signal to noise ratio

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Proceedings Article | 29 June 2006 Paper

The spectrometer optics of GIANO-TNG

S. Gennari, I. Mochi, S. Donati, E. Oliva, L. Origlia, P. Sandri

Proceedings Volume 6269, 62693Z (2006) https://doi.org/10.1117/12.670261

KEYWORDS: Mirrors, Prisms, Spectroscopy, Spectral resolution, Cryogenics, Infrared spectroscopy, Optical filters, Aluminum, Optical design, Collimation

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Showing 5 of 12 publications

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