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The linearity response of the Planck-LFI flight model receivers

OPEN ACCESS The Planck Low Frequency Instrument

A Mennellaa, F Villab, L Terenzib, F Cuttaiab, P Battagliac, M Bersanellia, R C Butlerb, O D'Arcangelod, E Artale, R Davisf, M Frailisg, C Franceschetc, S Galeottag, A Gregorioh,g, N Hughesi, P Jukkalai, D Kettlef, V-H Kilpiäi, M Laaninenj, P M Lapollac, R Leonardik, P Leuteneggerc, S Lowef, N Mandolesib, M Marisg, P Meinholdk, L Mendesl, M Miccolisc, G Morganteb, N Roddisf, M Sandrib, R Silvestric, L Stringhettib, M Tomasia, J Tuovinenm, L Valenzianob, A Zaccheig, J Varism, A Wilkinsonf and A Zoncan

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Part of The Planck Low Frequency Instrument

In this paper we discuss the linearity response of the Planck-LFI receivers, with particular reference to signal compression measured on the 30 and 44 GHz channels. In the article we discuss the various sources of compression and present a model that accurately describes data measured during tests performed with individual radiomeric chains. After discussing test results we present the best parameter set representing the receiver response and discuss the impact of non linearity on in-flight calibration, which is shown to be negligible.

Keywords

Microwave radiometers

Instruments for CMB observations

Space instrumentation

Systematic effects

PACS

95.55.-n Astronomical and space-research instrumentation

06.20.fb Standards and calibration

07.57.Kp Bolometers; infrared, submillimeter wave, microwave, and radiowave receivers and detectors

98.70.Vc Background radiations

07.60.Dq Photometers, radiometers, and colorimeters

Subjects

Instrumentation and measurement

Astrophysics and astroparticles

Dates

Issue 12 (December 2009)

Received 25 June 2009, accepted for publication 7 August 2009

Published 29 December 2009



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