一种用于辐射热加法干涉测量的有效相移方案
An efficient phase-shifting scheme for bolometric additive interferometry
摘要：
背景：大多数即将到来的CMB偏振实验将使用直接成像来通过B模式搜索原始引力波。测辐射热干涉测量是直接成像的一种有吸引力的替代方法，它结合了干涉测量在系统效应处理方面的优点和测辐射热探测器在灵敏度方面的优点。目的：我们计算的信号从测辐射热干涉仪，以调查其灵敏度的斯托克斯参数，特别注意的相移方案的选择，应用到输入通道，以调制信号。方法：将信号表示为Stokes参数的线性组合，其系数是相移的函数。结果如下：我们表明，信噪比的重建vibrium可以最大化提供的事实，相移方案是选择在一个特定的方式称为相干求和的等效基线。因此，测辐射热干涉仪与具有相同数量的喇叭的成像仪具有竞争力，但只有当执行等效基线的相干求和时。我们使用蒙特卡罗模拟证实我们的计算。我们还讨论了辐射热计之间的相对校准的不确定性的影响，并提出了一种方法来避免这种系统性的影响。
英文摘要：
Context: Most upcoming CMB polarization experiments will use direct imaging to search for the primordial gravitational waves through the B-modes. Bolometric interferometry is an appealing alternative to direct imaging that combines the advantages of interferometry in terms of systematic effects handling and those of bolometric detectors in terms of sensitivity. Aims: We calculate the signal from a bolometric interferometer in order to investigate its sensitivity to the Stokes parameters paying particular attention to the choice of the phase-shifting scheme applied to the input channels in order to modulate the signal. Methods: The signal is expressed as a linear combination of the Stokes parameter visibilities whose coefficients are functions of the phase-shifts. Results: We show that the signal to noise ratio on the reconstructed visibilities can be maximized provided the fact that the phase-shifting scheme is chosen in a particular way called coherent summation of equivalent baselines. As a result, a bolometric interferometer is competitive with an imager having the same number of horns, but only if the coherent summation of equivalent baselines is performed. We confirm our calculations using a Monte-Carlo simulation. We also discuss the impact of the uncertainties on the relative calibration between bolometers and propose a way to avoid this systematic effect.
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