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Proceedings Paper

Analysis of the pseudocorrelation radiometers for the low frequency instrument onboard the Planck satellite
Author(s): Francesco Cuttaia; Paola Battaglia; Luca Terenzi; Cristian Franceschet; Marco Bersanelli; Carlo Burigana; Chris Reginald Butler; O. D'Arcangelo; Pietro Guzzi; Davide Maino; Nazzareno Mandolesi; Aniello Mennella; Gianluca Morgante; Alessandro Simonetto; Luca Valenziano; Fabrizio Villa
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Paper Abstract

The Low Frequency Instrument aboard the PLANCK satellite will employ pseudo-correlation radiometers, operating over three broad bands centred at 30, 44 ,and 70 GHz. The radiometer scheme is based on the simultaneous comparison of two input signals, one coming from the sky and the other coming from a reference blackbody at a stable cryogenic temperature (near 4K) as close as possible to the sky temperature (about 2.7K). This choice is made in order to minimize non-white instrumental noise, typically exhibiting a 1/f spectrum. Effects due to the residual offset are minimised with a gain modulation factor applied in software. Fluctuations of the reference signal, due to fluctuation in the cooling chain or to straylight radiation, can also produce a parasitic signal which would mimic a true sky fluctuation. The PLANCK scientific goal of a high precision imaging of the CMB anisotropy requires an accurate characterisation of each part constituting the chain by using tools of modellisation and experimental tests. In this work we describe the concept of the radiometric chain, its functioning and the main sources of systematic errors, showing how, only with a hard modelling effort, it is possible to characterise, reduce and then remove in the data processing those systematic effects that may in principle compromise the quality of the whole instrument response.

Paper Details

Date Published: 8 October 2004
PDF: 12 pages
Proc. SPIE 5498, Millimeter and Submillimeter Detectors for Astronomy II, (8 October 2004); doi: 10.1117/12.551857
Show Author Affiliations
Francesco Cuttaia, CNR-ISAF Bologna (Italy)
Paola Battaglia, LABEN SpA (Italy)
Luca Terenzi, CNR-ISAF Bologna (Italy)
Cristian Franceschet, LABEN SpA (Italy)
Marco Bersanelli, Univ. degli Studi di Milano (Italy)
Carlo Burigana, CNR-ISAF Bologna (Italy)
Chris Reginald Butler, CNR-ISAF Bologna (Italy)
O. D'Arcangelo, CNR-IFP (Italy)
Pietro Guzzi, LABEN SpA (Italy)
Davide Maino, Univ. degli Studi di Milano (Italy)
Nazzareno Mandolesi, CNR-ISAF Bologna (Italy)
Aniello Mennella, CNR-ISAF Milano (Italy)
Gianluca Morgante, CNR-ISAF Bologna (Italy)
Alessandro Simonetto, CNR-IFP (Italy)
Luca Valenziano, CNR-ISAF Bologna (Italy)
Fabrizio Villa, CNR-ISAF Bologna (Italy)

Published in SPIE Proceedings Vol. 5498:
Millimeter and Submillimeter Detectors for Astronomy II
Jonas Zmuidzinas; Wayne S. Holland; Stafford Withington, Editor(s)

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