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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/28449
Title: Laboratory measurements of super-resolving Toraldo pupils for radio astronomical applications
Authors: OLMI, LUCA 
BOLLI, Pietro 
CRESCI, Luca 
D’Agostino, Francesco
Migliozzi, Massimo
Mugnai, Daniela
Natale, Enzo
NESTI, Renzo 
PANELLA, Dario 
Stefani, Lorenzo
Issue Date: 2017
Journal: EXPERIMENTAL ASTRONOMY 
Number: 43
Issue: 3
First Page: 285
Abstract: The concept of super-resolution refers to various methods for improving the angular resolution of an optical imaging system beyond the classical diffraction limit. Although several techniques to narrow the central lobe of the illumination Point Spread Function have been developed in optical microscopy, most of these methods cannot be implemented on astronomical telescopes. A possible exception is represented by the variable transmittance filters, also known as "Toraldo Pupils" (TPs) since they were introduced for the first time by G. Toraldo di Francia in 1952 (Toraldo di Francia, Il Nuovo Cimento (Suppl.) 9, 426, 1952). In the microwave range, the first successful laboratory test of TPs was performed in 2003 (Mugnai et al. Phys. Lett. A 311, 77-81, 2003). These first results suggested that TPs could represent a viable approach to achieve super-resolution in Radio Astronomy. We have therefore started a project devoted to a more exhaustive analysis of TPs, in order to assess their potential usefulness to achieve super-resolution on a radio telescope, as well as to determine their drawbacks. In the present work we report on the results of extensive microwave measurements, using TPs with different geometrical shapes, which confirm the correctness of the first experiments in 2003. We have also extended the original investigation to carry out full-wave electromagnetic numerical simulations and also to perform planar scanning of the near-field and transform the results into the far-field.
URI: http://hdl.handle.net/20.500.12386/28449
URL: https://link.springer.com/article/10.1007/s10686-017-9535-4
ISSN: 0922-6435
DOI: 10.1007/s10686-017-9535-4
Bibcode ADS: 2017ExA....43..285O
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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