Prof. Franco Meddi Profile

Prof. Franco Meddi

at Sapienza Univ di Roma

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Author

Publications (4)

Proceedings Article | 29 August 2022 Poster + Paper

SiFAP4XP: time domain polarimetry with silicon photometers at the TNG

A. Ghedina, F. Ambrosino, M. Cecconi, M. G. Gonzalez, L. Riverol, M. Hernandez, H. Pérez Ventura, J. J. San Juan, J. Guerra, M. Lodi, N. Hernandez, M. De Benedetto, A. Papitto, F. Leone, F. Meddi, Ennio Poretti

Proceedings Volume 12184, 121847U (2022) https://doi.org/10.1117/12.2629295

KEYWORDS: Photometry, Polarimetry, Cameras, Silicon, Stars, Sensors, Prisms, Global Positioning System, Electronics, Clocks, Pulsars

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Proceedings Article | 8 July 2018 Paper

SIFAP2: a new versatile configuration at the TNG for the MPPC based photometer

A. Ghedina, F. Leone, F. Ambrosino, F. Meddi, A. Papitto, L. Riverol, M. Hernandez, M. Cecconi, M. D. Gonzalez G., H. Perez Ventura, J. J. San Juan

Proceedings Volume 10702, 107025Q (2018) https://doi.org/10.1117/12.2316348

KEYWORDS: Photometry, Polarization, Stars, Analog electronics, Polarimetry, Wave plates, Telescopes, Pulsars, Sensors, Astronomy

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The quality of SiFAP (Silicon Fast Astronomical Photometer) at the TNG has already shown its ability to easily detect optical pulses from transitional millisecond pulsars and from other slower neutron stars. Up to now the photometer based on Silicon Photo Multipliers manufactured by Hamamatsu Photonics (MPPC, Multi Pixel Photon Counter) was mounted (on and manually aligned with) a MOS mask at the F/11 focal plane of the telescope. In order to have a more versatile instrument with the possibility to remotely center and point several targets during the night we have decided to build a new mechanical support for the MPPCs and mount it on the Namsyth Interface (NI), where originally OIG and later GIANO were hosted. The MPPC module devoted to observe the target will be placed at the center of the FoV (on-axis), while the reference signal will be collected from a peripheral star in the FoV (Field of view) by means of the MPPC module that will be set at this position by a combination of a linear stage movement and a derotator angle. At the same time we have introduced the option for a polarimetric mode, with a 3rd MPPC module and a polarizing cube beam-splitter that separates the states between this and the on axis MPPC. SiFAP has been developed with 3 independent custom electronic chains for data acquisition, exploiting the 3 different outputs (analog, digital, USB pre-processed) provided by the MPPCs modules. The electronic chain fed by the analog output is able to tag a single photon ToA (Time of Arrival) with a time resolution of 25 ns, while the remaining electronic chains can integrate the signal into time bins from 100 ms down to 20 μs. The absolute time is provided by a GPS unit with a time resolution of 25 ns at 50% of the rising edge of the 1PPS (1 Pulse Per Second) signal which is linked to the UTC (Universal Time Coordinated). Apart from the versatility with the remotely controlled on sky configuration of the MPPCs, the mounting of SiFAP2 at the NI allows for a permanent hosting of the instrument, readily available for observations. The new polarimetric mode will then offer other scientific opportunities that have not been explored so far in high-temporal resolution astronomy.

SPIE Journal Paper | 30 March 2018 Open Access

High-energy photon polarimeter for astrophysics

Maxim Eingorn, Lakma Fernando, Branislav Vlahovic, Cosmin Ilie, Bogdan Wojtsekhowski, Guido Maria Urciuoli, Fulvio De Persio, Franco Meddi, Vladimir Nelyubin

JATIS, Vol. 4, Issue 01, 011006, (March 2018) https://doi.org/10.1117/12.10.1117/1.JATIS.4.1.011006

KEYWORDS: Polarimetry, Polarization, Photon polarization, Sensors, Astrophysics, Pulsars, Silicon, Physics, Magnetism, Electrons

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Proceedings Article | 28 July 2014 Paper

Fast multichannel astronomical photometer based on silicon photo multipliers mounted at the Telescopio Nazionale Galileo

Filippo Ambrosino, Franco Meddi, Corinne Rossi, Silvia Sclavi, Roberto Nesci, Ivan Bruni, Adriano Ghedina, Luis Riverol, Luca Di Fabrizio

Proceedings Volume 9147, 91478R (2014) https://doi.org/10.1117/12.2064649

KEYWORDS: Photometry, Global Positioning System, Sensors, Data acquisition, Stars, Human-machine interfaces, Telescopes, Astronomy, Silicon, Signal processing

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