Advanced pseudo-correlation radiometers for the Planck-LFI instrument
Abstract
The LFI (Low Frequency Instrument) on board the ESA Planck satellite is constituted by an array of radiometric detectors actively cooled at 20 K in the 30-70 GHz frequency range in the focal plane of the Planck telescope. In this paper we present an overview of the LFI instrument, with a particular focus on the radiometer design. The adopted pseudo-correlation scheme uses a software balancing technique (with a tunable parameter called gain modulation factor) which is effective in reducing the radiometer susceptibility to amplifier instabilities also in presence of small non-idealities in the radiometric chain components, provided that the gain modulation factor is estimated with an accuracy of the order of 0.2%. These results have been recently confirmed by experimental laboratory measurements conducted on the LFI prototype radiometers at 30, 70 and 100 GHz.
Cite
@article{arxiv.astro-ph/0307116,
title = {Advanced pseudo-correlation radiometers for the Planck-LFI instrument},
author = {A. Mennella and M. Bersanelli and R. C. Butler and D. Maino and N. Mandolesi and G. Morgante and L. Valenziano and F. Villa and T. Gaier and M. Seiffert and S. Levin and C. Lawrence and P. Meinhold and P. Lubin and J. Tuovinen and J. Varis and T. Karttaavi and N. Hughes and P. Jukkala and P. Sjman and P. Kangaslahti and N. Roddis and D. Kettle and F. Winder and E. Blackhurst and R. Davis and A. Wilkinson and C. Castelli and B. Aja and E. Artal and L. de la Fuente and A. Mediavilla and J. P. Pascual and J. Gallegos and E. Martinez-Gonzalez and P. de Paco and L. Pradell},
journal= {arXiv preprint arXiv:astro-ph/0307116},
year = {2007}
}
Comments
6 pages, 3 figures