新一代亚毫米波偏振仪 Roger
New Generation Submillimeter Wave Polarimeter—Roger
吕伟涛，黄俊锟，孙笳淋，李华白1
作者信息
- 1. 香港中文大学 物理系，香港特别行政区 999077
- 折叠
摘要
传统的偏振测量技术依赖半波片和线栅偏振器，但在消除天空噪声方面存在局限性。Roger偏振仪创新性地引入了一种基于双屋面镜结构的调制偏振干涉仪（MPI）的设计及其在消除天空噪声中的应用。通过双屋面镜和线栅偏振器的组合，MPI 结构实现了单探测器对正交偏振信号的实时测量，显著提高了噪声抑制能力。穆勒矩阵分析表明，MPI 能够精确描述偏振信号与噪声的特性。在初步实验验证中，原型样机在 345 GHz 频段下实现了干涉调制，通过引入线性振动装置，调制频率可达千赫兹量级，从而优于传统旋转半波片的方案。此外，作为 Roger 偏振相机的核心模块，MPI 与 MKID 探测器阵列结合，在格陵兰射电望远镜中展现了优异的光学性能和探测效率。研究结果表明，MPI 结构和 MKIDs 探测器架构为高灵敏度偏振测量提供了一种高效的技术方案，在亚毫米波天文领域具有重要应用价值。
Abstract
Traditional polarization measurement techniques rely on half-wave plates and wire-grid polarizers but face limitations in suppressing sky noise. The Roger polarimeter innovatively introduces a modulated polarizinginterferometer (MPI) design based on a dual-roof-mirror structure and its application in mitigating sky noise. TheMPI structure combines dual roof mirrors and wire-grid polarizers to enable real-time measurement of orthogonalpolarization signals with a single detector, signiffcantly enhancing noise suppression capabilities. Mueller matrixanalysis demonstrates that the MPI can accurately characterize both polarization signals and noise properties. Inpreliminary experimental tests, a prototype achieved interference modulation at the 345 GHz band, and the introduction of a linear vibration mechanism was discussed, which could achieve modulation frequencies on the orderof kilohertz, outperforming traditional rotating half-wave plate solutions. Additionally, as the core module of theRoger polarimetric camera, the MPI, when combined with an MKID (Microwave Kinetic Inductance Detector) array, exhibits outstanding optical performance and detection efffciency in the Greenland Telescope. The researchresults indicate that the MPI structure and MKID detector architecture provide an efffcient technical solution forhigh-sensitivity polarization measurements, offering signiffcant application value in the ffeld of submillimeter-waveastronomy.关键词
偏振仪/亚毫米波/磁场/MPI/天空噪声/MKIDKey words
polarimeter/submillimeter wave/magnetic ffeld/MPI/sky noise/MKIDs引用本文复制引用
吕伟涛，黄俊锟，孙笳淋，李华白.新一代亚毫米波偏振仪 Roger[EB/OL].(2026-01-04)[2026-01-10].https://chinaxiv.org/abs/202601.00039.学科分类
天文学
评论