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arXiv 1005.2541astro-ph.IM
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普朗克发射前状态:低频仪器飞行模型辐射计的校准

Planck pre-launch status: calibration of the Low Frequency Instrument flight model radiometers

F. Villa, L. Terenzi, M. Sandri, P. Meinhold, T. Poutanen, P. Battaglia, C. Franceschet, N. Hughes, M. Laaninen, P. Lapolla, M. Bersanelli, R. C. Butler, F. Cut… 展开作者

F. Villa, L. Terenzi, M. Sandri, P. Meinhold, T. Poutanen, P. Battaglia, C. Franceschet, N. Hughes, M. Laaninen, P. Lapolla, M. Bersanelli, R. C. Butler, F. Cuttaia, O. D'Arcangelo, M. Frailis, E. Franceschi, S. Galeotta, A. Gregorio, R. Leonardi, S. R. Lowe, N. Mandolesi, M. Maris, L. Mendes, A. Mennella, G. Morgante, L. Stringhetti, M. Tomasi, L. Valenziano, A. Zacchei, A. Zonca, B. Aja, E. Artal, M. Balasini, T. Bernardino, E. Blackhurst, L. Boschini, B. Cappellini, F. Cavaliere, A. Colin, F. Colombo, R. J. Davis, L. De La Fuente, J. Edgeley, T. Gaier, A. Galtress, R. Hoyland, P. Jukkala, D. Kettle, V-H. Kilpia, C. R. Lawrence, D. Lawson, J. P. Leahy, P. Leutenegger, S. Levin, D. Maino, M. Malaspina, A. Mediavilla, M. Miccolis, L. Pagan, J. P. Pascual, F. Pasian, M. Pecora, M. Pospieszalski, N. Roddis, M. J. Salmon, M. Seiffert, R. Silvestri, A. Simonetto, P. Sjoman, C. Sozzi, J. Tuovinen, J. Varis, A. Wilkinson, F. Winder

摘要:

欧空局普朗克卫星上的低频仪器(LFI)携带了11个辐射计子系统,称为辐射计链组件(RCA),每个子系统由一对伪相关接收器组成。我们描述了地面校准活动进行资格的飞行模型RCA和测量其发射前的性能。每个RCA都在专用的飞行低温环境中进行校准,辐射计前端冷却到20 K,后端冷却到300 K,外部输入负载冷却到4K。模拟不同温度下黑体的匹配负载被放置在天喇叭的前面,以获得基本的辐射计特性,如噪声温度,增益和噪声性能,例如1/f噪声。测量每个探测器的光谱响应,以及它们对热变化的敏感性。对所有11个LFI RCA进行了校准。在这些测试中测量的仪器参数,如噪声温度、带宽、辐射计隔离度和线性度,为普朗克-LFI数据分析提供了必要的输入。

英文摘要:

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 20K and the back-end at 300K, and with an external input load cooled to 4K. 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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