Planck-LFI radiometers' spectral response

被引：22

作者：

Zonca, A. ^{[1
]}

Franceschet, C. ^{[2
]}

Battaglia, P. ^{[3
]}

Villa, F. ^{[4
]}

Mennella, A. ^{[2
]}

D'Arcangelo, O. ^{[5
]}

Silvestri, R. ^{[3
]}

Bersanelli, M. ^{[2
]}

Artal, E. ^{[6
]}

Butler, R. C. ^{[4
]}

Cuttaia, F. ^{[4
]}

Davis, R. J. ^{[7
]}

Galeotta, S. ^{[8
]}

Hughes, N. ^{[9
]}

Jukkala, P. ^{[9
]}

Kilpia, V. -H. ^{[9
]}

Laaninen, M. ^{[10
]}

Mandolesi, N. ^{[4
]}

Maris, M. ^{[8
]}

Mendes, L. ^{[11
]}

Sandri, M. ^{[4
]}

Terenzi, L. ^{[4
]}

Tuovinen, J. ^{[12
]}

Varis, J. ^{[12
]}

Wilkinson, A. ^{[7
]}

机构：

[1] INAF IASF Milano, I-20133 Milan, Italy

[2] Univ Milan, Dipartimento Fis, I-20133 Milan, Italy

[3] Thales Alenia Space Italia SpA, I-20090 Milan, Italy

[4] INAF IASF Bologna, I-40129 Bologna, Italy

[5] IFP CNR, I-20125 Milan, Italy

[6] Univ Cantabria, Dept Ingn Comunicac, E-39005 Santander, Spain

[7] Univ Manchester, Jodrell Bank, Ctr Astrophys, Manchester M13 9PL, Lancs, England

[8] INAF OATs, I-34131 Trieste, Italy

[9] DA Design Oy, FI-31600 Jokioinen, Finland

[10] Ylinen Elect Oy, FIN-02700 Kauniainen, Finland

[11] ESA ESAC, Madrid 28692, Spain

[12] VTT Tech Res Ctr Finland, MilliLab, Espoo, Finland

来源：

JOURNAL OF INSTRUMENTATION | 2009年 / 4卷

关键词：

Spectral responses; Space instrumentation; Microwave radiometers; Instruments for CMB observations;

D O I：

10.1088/1748-0221/4/12/T12010

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

The Low Frequency Instrument (LFI) is an array of pseudo-correlation radiometers on board the Planck satellite, the ESA mission dedicated to precision measurements of the Cosmic Microwave Background. The LFI covers three bands centred at 30, 44 and 70 GHz, with a goal bandwidth of 20% of the central frequency. The characterization of the broadband frequency response of each radiometer is necessary to understand and correct for systematic effects, particularly those related to foreground residuals and polarization measurements. In this paper we present the measured band shape of all the LFI channels and discuss the methods adopted for their estimation. The spectral characterization of each radiometer was obtained by combining the measured spectral response of individual units through a dedicated RF model of the LFI receiver scheme. As a consistency check, we also attempted end-to-end spectral measurements of the integrated radiometer chain in a cryogenic chamber. However, due to systematic effects in the measurement setup, only qualitative results were obtained from these tests. The measured LFI bandpasses exhibit a moderate level of ripple, compatible with the instrument scientific requirements.

引用

页数：16

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