Journal
ASTRONOMY & ASTROPHYSICS
Volume 520, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/200912860
Keywords
cosmic microwave background; space vehicles: instruments; instrumentation: detectors; techniques: miscellaneous
Categories
Funding
- ESA
- Italian Space Agency (ASI)
- Finnish Funding Agency for Technology and Innovation (Tekes)
- Academy of Finland [205800, 214598, 121703, 121962]
- Waldemar von Frenckells stiftelse
- Magnus Ehrnrooth Foundation
- Vaisala Foundation
- Ministerio de Ciencia e Innovacion [ESP2004-07067-C03-01, AYA2007-68058-C03-02]
- UK Space Agency [ST/H001212/1] Funding Source: researchfish
- Academy of Finland (AKA) [121703, 205800, 121962, 121703, 121962, 205800] Funding Source: Academy of Finland (AKA)
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The Low Frequency Instrument (LFI) on-board the ESA Planck satellite carries eleven radiometer subsystems, called radiometer chain assemblies (RCAs), each composed of a pair of pseudo-correlation receivers. We describe the on-ground calibration campaign performed to qualify the flight model RCAs and to measure their pre-launch performances. Each RCA was calibrated in a dedicated flight-like cryogenic environment with the radiometer front-end cooled to 20 K and the back-end at 300 K, and with an external input load cooled to 4 K. A matched load simulating a blackbody at different temperatures was placed in front of the sky horn to derive basic radiometer properties such as noise temperature, gain, and noise performance, e. g. 1/f noise. The spectral response of each detector was measured as was their susceptibility to thermal variation. All eleven LFI RCAs were calibrated. Instrumental parameters measured in these tests, such as noise temperature, bandwidth, radiometer isolation, and linearity, provide essential inputs to the Planck-LFI data analysis.
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