SQUIDPOL: Seoul National University QUadruple Imaging Device for POLarimetry
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| Auteurs principaux: | , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866912871837859840 |
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| author | Jin, Sunho Geem, Jooyeon Ishiguro, Masateru Park, Woojin Oh, Heeyoung Park, Chan Choi, Seungwon Bach, Yoonsoo P. Ju, Hyeonwoo Seo, Jinguk Lim, Bumhoo Im, Myungshin |
| author_facet | Jin, Sunho Geem, Jooyeon Ishiguro, Masateru Park, Woojin Oh, Heeyoung Park, Chan Choi, Seungwon Bach, Yoonsoo P. Ju, Hyeonwoo Seo, Jinguk Lim, Bumhoo Im, Myungshin |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_03233 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | SQUIDPOL: Seoul National University QUadruple Imaging Device for POLarimetry Jin, Sunho Geem, Jooyeon Ishiguro, Masateru Park, Woojin Oh, Heeyoung Park, Chan Choi, Seungwon Bach, Yoonsoo P. Ju, Hyeonwoo Seo, Jinguk Lim, Bumhoo Im, Myungshin Instrumentation and Methods for Astrophysics 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. |
| title | SQUIDPOL: Seoul National University QUadruple Imaging Device for POLarimetry |
| topic | Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2602.03233 |