Calibration of millimeter-wave polarimeters using a thin dielectric sheet
Calibration of millimeter-wave polarimeters using a thin dielectric sheet
复制标题
使用薄介电片校准毫米波偏振计
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
P. Timbie
中科院分区：
文献类型：
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作者：
C. O’Dell;D. Swetz;P. Timbie
介绍了一种新型毫米波和微波偏振计定标系统的原理和应用。该技术是传统线栅方法的简单扩展，但采用薄电介质片而不是网格。这种方法的主要优点是获得仅轻微偏振的校准信号，这对于某些应用（例如测量非常低的偏振水平的天文辐射计或具有小动态范围的系统）是有益的。我们比较了这种方法与其他校准技术，并讨论了它的成功使用的大角度区域实验，旨在测量宇宙微波背景辐射的偏振观测的校准。
We present the theory and application of a novel calibration system for millimeter and microwave polarimeters. The technique is a simple extension of the conventional wire-grid approach, but employs a thin dielectric sheet rather than a grid. The primary advantage of this approach is to obtain a calibration signal that is only slightly polarized, which can be beneficial for certain applications such as astronomical radiometers that measure very low levels of polarization, or systems with a small dynamic range. We compare this approach with other calibration techniques and discuss its successful use in the calibration of the polarization observations of large angular regions experiment, designed to measure polarization in cosmic microwave background radiation.