SQUIDPOL：首尔大学四通道偏振成像仪
SQUIDPOL: Seoul National University QUadruple Imaging Device for POLarimetry
AI总结：
SQUIDPOL是一种低成本多通道偏振成像设备，通过旋转半波片和金属丝网格滤光片实现线偏振测量，具备高精度偏振测量能力和标准滤光片支持。
摘要：
我们介绍了SQUIDPOL，一种低成本的多通道光学成像偏振计，利用旋转半波片、非偏振分束器和四个金属丝网格滤光片同时进行线偏振测量。我们展示了商用非偏振分束器引入可测量的偏振依赖系统误差，如果未进行修正，可能会偏振测量结果产生偏差。我们对传输和反射光束的这种效应进行了量化，并将其纳入数据处理流程中。实地验证显示其性能稳定且可重复，能够达到约0.15%的偏振精度，适用于明亮偏振标准星。SQUIDPOL安装在首尔大学Pyeongchang天文台的60厘米里奇-克雷蒂安望远镜（焦距4200毫米，f/7）上，提供13.5 by 8.2角分的有效共同视场，像素尺度为每像素0.45角秒，并支持标准B、V、R_C和I_C滤光片。
英文摘要：
We present SQUIDPOL, a low-cost, multi-channel optical imaging polarimeter that performs simultaneous linear polarization measurements using a rotating half-wave plate, a non-polarizing beam splitter, and four wire-grid filters. We show that the off-the-shelf non-polarizing beam splitter introduces measurable polarization-dependent systematics, which can bias polarimetric measurements if left uncorrected. We quantify this effect for both transmitted and reflected beams and incorporate a correction scheme into the data-analysis pipeline. On-sky validation demonstrates stable and reproducible performance, achieving a polarization accuracy of about 0.15 percent for bright polarized standard stars. Mounted on the 60-cm Ritchey-Chretien telescope (focal length 4200 mm, f/7) at the Pyeongchang Observatory of Seoul National University, SQUIDPOL provides an effective common field of view of 13.5 by 8.2 arcminutes with a pixel scale of 0.45 arcseconds per pixel and supports standard B, V, R_C, and I_C filters.
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