The millimeter-wave bolometric interferometer

The millimeter-wave bolometric interferometer
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毫米波测辐射热干涉仪

DOI:
10.1117/12.672246
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发表时间:
2006
期刊:
--
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通讯作者:
Korotkov A
Korotkov A
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作者:
Korotkov A

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毫米波辐射干涉仪(MBI)是为测量宇宙微波背景(CMB)偏振而设计的。MBI结合了干涉仪的差分能力和毫米波波段辐射热计的高灵敏度。它通过低旁瓣和几乎对称的波束模式的波纹喇叭天线直接观察天空,以避免反射光学产生的虚假仪器偏振。讨论了具有4个7度视场波纹角(MBI-4)的仪器的第一个版本的设计。MBI-4光带由中心频率为90 GHz的滤波器定义。由天线间距确定的基线使仪器在多极范围内(l= 150-270)对微波背景极化波动敏感。在MBI-4中,来自天线的信号与菲索波束合并器结合,干扰条纹由一组带有NTD锗热敏电阻的蛛网辐射热计检测。为了从每个测热计检测到的总功率中分离可见信号,来自每个天线的信号的相位由基于铁氧体的波导移相器调制。观测计划在威斯康星州麦迪逊市外的派恩布拉夫天文台进行。
The Millimeter-Wave Bolometric Interferometer (MBI) is designed for sensitive measurements of the polarization of the cosmic microwave background (CMB). MBI combines the differencing capabilities of an interferometer with the high sensitivity of bolometers at millimeter wavelengths. It views the sky directly through corrugated horn antennas with low sidelobes and nearly symmetric beam patterns to avoid spurious instrumental polarization from reflective optics. The design of the first version of the instrument with four 7-degree-FOV corrugated horns (MBI-4) is discussed. The MBI-4 optical band is defined by filters with a central frequency of 90 GHz. The set of baselines determined by the antenna separation makes the instrument sensitive to CMB polarization fluctuations over the multipole range l= 150-270. In MBI-4, the signals from antennas are combined with a Fizeau beam combiner and interference fringes are detected by an array of spider-web bolometers with NTD germanium thermistors. In order to separate the visibility signals from the total power detected by each bolometer, the phase of the signal from each antenna is modulated by a ferrite-based waveguide phase shifter. Observations are planned from the Pine Bluff Observatory outside Madison, WI.
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DOI: --
发表时间: 2002
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