Construction of a large diameter reflective half-wave plate modulator for millimeter wave applications

Construction of a large diameter reflective half-wave plate modulator for millimeter wave applications
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用于毫米波应用的大直径反射式半波片调制器的构造

DOI:
10.1117/12.2630637
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发表时间:
2022
期刊:
and Far-Infrared Detectors and Instrumentation for Astronomy XI
影响因子:
--
通讯作者:
Datta, Rahul
Datta, Rahul
中科院分区:
--
文献类型:
--
作者:
Eimer, Joseph R.;Brewer, Michael K.;Chuss, David T.;Karakla, John;Shi, Rui;Appel, John W.;Bennett, Charles L.;Cleary, Joseph;Dahal, Sumit;Datta, Rahul

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偏振调制是一种强有力的技术,通过区分偏振信号与主要的缓慢系统漂移和非偏振前景来增加测量的稳定性。此外,当尽可能靠近天空放置时,调制可以减少仪器偏振的系统误差。本文介绍了一种直径为60 cm的新型反射式半波片偏振调制器的设计和初步的驱动系统实验室性能。波片由位于平面镜前面的线阵列组成。使用直径为50μm、间距为175μm的金属丝,波片将适用于毫米波长范围内的工作,金属丝的平坦度和与反射镜的平行度保持在波长的一小部分。所提出的设计目标是77-108 GHz范围。调制是通过使用主动控制伺服电机的定制旋转驱动器旋转波片来执行的。
Polarization modulation is a powerful technique to increase the stability of measurements by enabling the distinction of a polarized signal from dominant slow system drifts and unpolarized foregrounds. Furthermore, when placed as close to the sky as possible, modulation can reduce systematic errors from instrument polarization. In this work, we introduce the design and preliminary drive system laboratory performance of a new 60 cm diameter reflective half-wave plate (RHWP) polarization modulator. The wave plate consists of a wire array situated in front of a flat mirror. Using 50μm diameter wires with 175μm spacing, the wave plate will be suitable for operation in the millimeter wavelength range with flatness of the wires and parallelism to the mirror held to a small fraction of a wavelength. The presented design targets the 77–108 GHz range. Modulation is performed by a rotation of the wave plate with a custom rotary drive utilizing an actively controlled servo motor.
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发表时间: 2018
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影响因子: --
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