Dr. Francesca Pieralli Profile

Dr. Francesca Pieralli

at Pecchioli Research Srl

SPIE Involvement:

Author

Publications (5)

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 | 15 July 2010 Paper

First light AO (FLAO) system for LBT: final integration, acceptance test in Europe, and preliminary on-sky commissioning results

Simone Esposito, Armando Riccardi, Luca Fini, Alfio Puglisi, Enrico Pinna, Marco Xompero, Runa Briguglio, Fernando Quirós-Pacheco, Paolo Stefanini, Juan Guerra, Lorenzo Busoni, Andrea Tozzi, Francesca Pieralli, Guido Agapito, Guido Brusa-Zappellini, Richard Demers, Joar Brynnel, Carmelo Arcidiacono, Piero Salinari

Proceedings Volume 7736, 773609 (2010) https://doi.org/10.1117/12.858194

KEYWORDS: Adaptive optics, Stars, Point spread functions, Telescopes, Mirrors, Calibration, Actuators, Sensors, Interferometers, Cameras

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Proceedings Article | 11 July 2008 Paper

Sinusoidal calibration technique for Large Binocular Telescope system

F. Pieralli, A. Puglisi, F. Quiros Pacheco, S. Esposito

Proceedings Volume 7015, 70153A (2008) https://doi.org/10.1117/12.789273

KEYWORDS: Calibration, Telescopes, Signal to noise ratio, Modulation, Adaptive optics, Mirrors, Device simulation, Actuators, Wavefront sensors, Deformable mirrors

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Proceedings Article | 27 June 2006 Paper

First light AO system for LBT: toward on-sky operation

S. Esposito, A. Tozzi, A. Puglisi, E. Pinna, A. Riccardi, S. Busoni, L. Busoni, P. Stefanini, M. Xompero, D. Zanotti, F. Pieralli

Proceedings Volume 6272, 62720A (2006) https://doi.org/10.1117/12.673509

KEYWORDS: Adaptive optics, Mirrors, Wavefront sensors, Telescopes, Sensors, Prototyping, Signal to noise ratio, Electronics, Actuators, Calibration

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Proceedings Article | 23 June 2006 Paper

Phase ambiguity solution with the Pyramid Phasing Sensor

E. Pinna, S. Esposito, A. Puglisi, F. Pieralli, R. Myers, L. Busoni, A. Tozzi, P. Stefanini

Proceedings Volume 6267, 62672Y (2006) https://doi.org/10.1117/12.671492

KEYWORDS: Mirrors, Sensors, Calibration, Wavefronts, Microelectromechanical systems, Telescopes, Segmented mirrors, Deformable mirrors, Tunable filters, Actuators

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In the technological development for the ELTs, one of the key activities is the phasing and alignment of the primary mirror segments. To achieve the phasing accuracy of a small fraction of the wavelength, an optical sensor is required. In 2005 has been demonstrated that the Pyramid Wavefront Sensor can be employed in closed loop to correct simultaneously piston, tip and tilt errors of segmented mirror. The Pyramid Phasing Sensor (PYPS) is based on the sensing of phase step on the segment edges; this kind of phasing sensors have the common limitation of the signal ambiguity induced by the phase periodicity of πδ/λ on the mirror surface step δ, when the wavelength λ is used for the sensing. In this paper we briefly describe three different techniques that allow to solve the phase ambiguity with PYPS. As first we present experimental results on the two wavelengths closed loop procedure proposed by Esposito in 2001; in the laboratory test the multi-wavelength procedure allowed to exceed the sensor capture range of ±λ/2 and simultaneously retrieve the differential piston of the 32 mirror segments starting from random positions in a 3.2 λ wavefront range, the maximum allowed by the mirror stroke. Then we propose two new techniques based respectively on the segment and wavelength sweep. The Segment Sweep Technique (SST) has been successfully applied during the experimental tests of PYPS at the William Herschel Telescope, when 13 segments of the NAOMI DM has been phased starting from a random position in a 15λ range. The Wavelength Sweep Technique (WST) has been subject of preliminary tests in the Arcetri laboratories in order to prove the concept. Each technique has different capture range, accuracy and operation time, so that each can solve different tasks required to an optical phasing sensor in the ELT application. More in detail the WST and SST could be used combined for the first mirror phasing when the calibration required for the closed loop operations are not yet available. Then the closed loop capture range can be extended from ±λ/2 to ±10λ with the multi-wavelength closed loop technique.

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