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Proceedings Paper

LBC: the prime focus optical imagers at the LBT telescope
Author(s): Fernando Pedichini; Emanuele Giallongo; Roberto Ragazzoni; Andrea Di Paola; Adriano Fontana; Roberto Speziali; Jacopo Farinato; Andrea Baruffolo; Carlo E. Magagna; Emiliano Diolaiti; Fabio Pasian; Riccardo Smareglia; Enzo Anaclerio; Daniele Gallieni; Paolo G. Lazzarini
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Paper Abstract

The Large Binocular Camera (LBC) is the double optical imager that will be installed at the prime foci of the Large Binocular Telescope (2x8.4 m). Four Italian observatories are cooperating in this project: Rome (CCD Camera), Arcetri-Padua (Optical Corrector) and Trieste (Software). LBC is composed by two separated large field (27 arcmin FOV) cameras, one optimized for the UBV bands and the second for the VRIZ bands. An optical corrector balances the aberrations induced by the fast (F#=1.14) parabolic primary mirror of LBT, assuring that the 80% of the PSF encircled energy falls inside one pixel for more of the 90% of the field. Each corrector uses six lenses with the first having a diameter of 80cm and the third with an aspherical surface. Two filter wheels allow the use of 8 filters. The two channels have similar optical designs satisfying the same requirements, but differ in the lens glasses: fused silica for the "blue" arm and BK7 for the "red" one. The two focal plane cameras use an array of four 4290 chips (4.5x2 K) provided by Marconi optimized for the maximum quantum efficiency (85%) in each channel. The sampling is 0.23 arcseconds/pixel. The arrays are cooled by LN2 cryostats assuring 24 hours of operation. Here we present a description of the project and its current status including a report about the Blue camera and its laboratory tests. This instrument is planned to be the first light instrument of LBT.

Paper Details

Date Published: 7 March 2003
PDF: 12 pages
Proc. SPIE 4841, Instrument Design and Performance for Optical/Infrared Ground-based Telescopes, (7 March 2003); doi: 10.1117/12.461011
Show Author Affiliations
Fernando Pedichini, INAF-Osservatorio Astronomico di Roma (Italy)
Emanuele Giallongo, INAF-Osservatorio Astronomico di Roma (Italy)
Roberto Ragazzoni, INAF-Osservatorio Astrofisico di Arcetri (Italy)
Andrea Di Paola, Osservatorio Astronomico di Roma (Italy)
Adriano Fontana, Osservatorio Astronomico di Roma (Italy)
Roberto Speziali, Osservatorio Astronomico di Roma (Italy)
Jacopo Farinato, INAF-Osservatorio Astrofisico di Arcetri (Italy)
Andrea Baruffolo, INAF-Osservatorio Astronomico di Padova (Italy)
Carlo E. Magagna, INAF-Osservatorio Astronomico di Padova (Italy)
Emiliano Diolaiti, Univ. degli Studi di Padova (Italy)
Fabio Pasian, Univ. degli Studi di Padova (Italy)
Riccardo Smareglia, Univ. degli Studi di Padova (Italy)
Enzo Anaclerio, ADS International S.r.L. (Italy)
Daniele Gallieni, ADS International Srl (Italy)
Paolo G. Lazzarini, ADS International Srl (United States)

Published in SPIE Proceedings Vol. 4841:
Instrument Design and Performance for Optical/Infrared Ground-based Telescopes
Masanori Iye; Alan F. M. Moorwood, Editor(s)

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