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A high-speed and high-efficiency imaging polarimeter based on ferroelectric liquid crystal retarders: Design and test
Guo J(郭晶); Ren DQ(任德清); Zhu YT(朱永田); Zhang X(张熙)
2021-02
Source PublicationPubl. Astron. Soc. Japan
Volume73Issue:2Pages:405-416
Abstract

Polarimeters play a key role in investigating solar magnetic fields. In this paper, a High speed and high efficiency Imaging POlarimeter (HIPO) is proposed based on a pair of ferroelectric liquid crystal retarders (FLCs), with the ultimate goal of measuring magnetic fields of prominences and filaments from the ground. A unique feature of the HIPO is that it enables high cadence polarization measurements covering a wide field of view (FOV); the modulation frequency of the HIPO is able to achieve ∼100 Hz, which greatly suppresses the seeing-induced crosstalk, and the maximum FOV can reach 62× 525.
Additionally, FLC retardances under low and high states were calibrated individually andfound to have a slight discrepancy, which is neglected in most works. Based on FLCcalibration results, an optimization was performed using a constrained nonlinear mini-mization approach to obtain the maximum polarimetric efficiency. Specifically, optimized efficiencies of the Stokes Q, U, and V are well balanced and determined as (ξ Q, ξ U, ξ V) =(0.5957, 0.5534, 0.5777), yielding a total efficiency of 0.9974. Their practical efficiencies aremeasured as (ξ Q, ξ U, ξ V) = (0.5934, 0.5385, 0.5747), slightly below the optimized values but still resulting in a high total efficiency of 0.9861. The HIPO shows advantages in terms of modulation frequency and polarimetric efficiency compared with most other representative ground-based solar polarimeters. In the observations, measurement accuracy is found to be better than 2.7 × 10 −3 by evaluating full Stokes Hα  polarimetry results of the chromosphere. This work lays a foundation for the development of high-speed and high-accuracy polarimeters for our next-generation solar instruments.

Keywordinstrumentation: polarimeters Sun: chromosphere techniques: polarimetric methods: miscellaneous
Subject Area天文技术与方法
Document Type期刊论文
Identifierhttp://ir.niaot.ac.cn/handle/114a32/1961
Collection中国科学院南京天文光学技术研究所_期刊论文
天文光谱和高分辨成像技术研究室_期刊论文
Affiliation南京天文光学技术研究所
Recommended Citation
GB/T 7714
Guo J,Ren DQ,Zhu YT,et al. A high-speed and high-efficiency imaging polarimeter based on ferroelectric liquid crystal retarders: Design and test[J]. Publ. Astron. Soc. Japan,2021,73(2):405-416.
APA Guo J,Ren DQ,Zhu YT,&Zhang X.(2021).A high-speed and high-efficiency imaging polarimeter based on ferroelectric liquid crystal retarders: Design and test.Publ. Astron. Soc. Japan,73(2),405-416.
MLA Guo J,et al."A high-speed and high-efficiency imaging polarimeter based on ferroelectric liquid crystal retarders: Design and test".Publ. Astron. Soc. Japan 73.2(2021):405-416.
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