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A High-Efficiency and High-Accuracy Polarimeter for Solar Magnetic Field Measurements
Ren, Deqing1; Han, Zijian2,3,4; Guo, Jing2,3
2020-08-06
Source PublicationSOLAR PHYSICS
ISSN0038-0938
Volume295Issue:8Pages:23
AbstractSolar activity is dominated by the magnetic field. Nowadays, a polarimeter is a mandatory tool to measure solar magnetic fields, which are generally faint and correspond to a polarization of an order of 10(-2)-10(-4). As such, polarization measurements of high efficiency with a high accuracy are crucial to investigate faint magnetic fields. Here we propose a high-efficiency and high-accuracy polarimeter, which is based on a pair of nematic liquid crystal variable retarders (LCVRs) and a Wollaston prism (WP). It uses a dedicated Stokes modulation strategy to achieve high efficiency. A calibration unit (CU) is developed to measure the polarimeter response matrix, which provides a high-precision calibration to correct possible systematic errors. Compared with other traditional polarimeters, the modulation scheme of our polarimeter is flexible. In addition to be able to measure all the three Stokes polarization components (Q, U, or V) simultaneously, it can also measure one or two of these polarization components alone, with high polarization efficiency. Dedicated alignment and calibration techniques optimized for our polarimeter are developed and high measurement accuracy is achieved. In our laboratory experimental test, our two-image based polarization measurement delivers an overall measurement accuracy of the order of 10(-4), which is about 10 times better, compared with our previous polarimeters that use the traditional four-image polarization modulation. This work provides a new option for high-efficiency and high-accuracy polarization measurement for future solar synoptic observations.
KeywordInstrumentation and data management Polarization Optical Magnetic fields Chromosphere
Funding OrganizationNational Science Foundation (NSF) ; National Science Foundation (NSF) ; National Science Foundation (NSF) ; National Science Foundation (NSF) ; National Science Foundation (NSF) ; National Science Foundation (NSF) ; National Science Foundation (NSF) ; National Science Foundation (NSF)
DOI10.1007/s11207-020-01676-2
WOS KeywordCALIBRATION ; TELESCOPE ; PROMINENCES ; VECTOR ; HANLE
Language英语
Funding ProjectNational Science Foundation (NSF)[AST-1607921] ; National Science Foundation (NSF)[AST-1906166]
Funding OrganizationNational Science Foundation (NSF) ; National Science Foundation (NSF) ; National Science Foundation (NSF) ; National Science Foundation (NSF) ; National Science Foundation (NSF) ; National Science Foundation (NSF) ; National Science Foundation (NSF) ; National Science Foundation (NSF)
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000556974700001
PublisherSPRINGER
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/82391
Collection中国科学院国家天文台
Corresponding AuthorRen, Deqing
Affiliation1.Calif State Univ Northridge, Phys & Astron Dept, Northridge, CA 91330 USA
2.Chinese Acad Sci, Nanjing Inst Astron Opt & Technol, Natl Astron Observ, Nanjing 210042, Peoples R China
3.Chinese Acad Sci, Nanjing Inst Astron Opt & Technol, Key Lab Astron Opt & Technol, Nanjing 210042, Peoples R China
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Ren, Deqing,Han, Zijian,Guo, Jing. A High-Efficiency and High-Accuracy Polarimeter for Solar Magnetic Field Measurements[J]. SOLAR PHYSICS,2020,295(8):23.
APA Ren, Deqing,Han, Zijian,&Guo, Jing.(2020).A High-Efficiency and High-Accuracy Polarimeter for Solar Magnetic Field Measurements.SOLAR PHYSICS,295(8),23.
MLA Ren, Deqing,et al."A High-Efficiency and High-Accuracy Polarimeter for Solar Magnetic Field Measurements".SOLAR PHYSICS 295.8(2020):23.
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