The Hertz/VPM polarimeter: design and first light observations.
The Hertz/VPM polarimeter: design and first light observations.
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Hertz/VPM 旋光计：设计和首次光观察。
DOI：
10.1364/ao.47.004429
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发表时间：
2008
期刊：
影响因子：
1.9
通讯作者：
Edward J. Wollack
中科院分区：
文献类型：
--
作者：
M. Krejny;D. Chuss;C. d'Aubigny;D. Golish;M. Houde;H. Hui;C. Kulesa;R. Loewenstein;S. Moseley;G. Novak;G. Voellmer;C. Walker;Edward J. Wollack
我们提出的第一个结果赫兹/VPM，第一个亚毫米波偏振计采用双可变延迟偏振调制器（双VPM）。这种器件与以前使用的偏振调制器的不同之处在于，它以平移方式工作，而不是机械旋转。我们讨论了这种器件背后的基本理论及其相对于常用半波片的潜在优势。双VPM在亚毫米望远镜天文台和实验室进行了测试。在每一种情况下，我们提出了一个详细的说明设置。我们发现，VPM线栅的性质（直径和间距）导致的行为与理想线栅性能的理论预测不同。通过修改偏振计设置来补偿这种行为，我们发现双VPM系统是鲁棒的，具有高效率和低仪器偏振。该设备非常适合于空中和空间应用。
We present first results of Hertz/VPM, the first submillimeter polarimeter employing the dual Variable-delay Polarization Modulator (dual-VPM). This device differs from previously used polarization modulators in that it operates in translation, rather than mechanical rotation. We discuss the basic theory behind this device and its potential advantages over the commonly used half-wave plate. The dual-VPM was tested both at the Submillimeter Telescope Observatory and in the laboratory. In each case we present a detailed description of the setup. We discovered that properties of the VPM wire grids (diameter and spacing) caused behavior that differs from theoretical predictions for ideal wire grid performance. By modifying the polarimeter settings to compensate for this behavior, we found that the dual-VPM system is robust, operating with high efficiency and low instrumental polarization. This device is well suited for air- and space-borne applications.