A High-Efficiency and High-Accuracy Polarimeter for Solar Magnetic Field Measurements

Ren, Deqing; Han, Zi-Jian; Guo, Jing

doi:10.1007/s11207-020-01676-2

Cited by 4 publications

(1 citation statement)

References 29 publications

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“…Imaging polarimetry can be used to detect the roughness, shape, and stress distribution of an object surface effectively through the Stokes vector (S0, S1, S2, S3) of the target scene, and this method is widely used in material analyses, medical imaging, optical remote sensing, and other fields [1][2][3][4][5]. Over the past few decades, researchers have proposed many methods to accomplish full-Stokes imaging [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Autocalibration full-Stokes imaging polarimetry using a polarization array

Liu,

2024

Sixth Conference on Frontiers in Optical Imaging and Technology: Applications of Imaging Technologies

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We report and demonstrate full-Stokes imaging polarimetry via random retarder rotation (R3). The method adds an assistant imaging channel comprising a linear polarization array and point source to the classical full-Stokes imaging optical path. Further, an alternating iterative algorithm of the polarization information matrix is used to solve the rotation angle of the phase retarder to obtain the full-Stokes information of the imaging target. Theoretical analysis, numerical simulations, and comparative experiments are conducted to verify that the proposed method can achieve accurate full-Stokes imaging measurements via R3. To the best of our knowledge, this is the first time that a full-Stokes imaging method with high precision performance has been proposed that does not depend on accuracy of rotation angle.

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Section: Introductionmentioning

confidence: 99%

Autocalibration full-Stokes imaging polarimetry using a polarization array

Liu,

2024

Sixth Conference on Frontiers in Optical Imaging and Technology: Applications of Imaging Technologies

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Full‐Stokes imaging polarimetry via random retarder rotation

Liu

Duan

et al. 2023

Optics and Lasers in Engineering

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A high-speed and high-efficiency imaging polarimeter based on ferroelectric liquid crystal retarders: Design and test

Guo

Ren

Zhu

et al. 2021

Publications of the Astronomical Society of Japan

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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 and found to have a slight discrepancy, which is neglected in most works. Based on FLC calibration results, an optimization was performed using a constrained nonlinear minimization approach to obtain the maximum polarimetric efficiency. Specifically, optimized efficiencies of the Stokes Q, U, and V are well balanced and determined as (ξQ, ξU, ξV) = (0.5957, 0.5534, 0.5777), yielding a total efficiency of 0.9974. Their practical efficiencies are measured as (ξQ′, ξU′, ξV′) = (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.

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A High-Efficiency and High-Accuracy Polarimeter for Solar Magnetic Field Measurements

Cited by 4 publications

References 29 publications

Autocalibration full-Stokes imaging polarimetry using a polarization array

Autocalibration full-Stokes imaging polarimetry using a polarization array

Full‐Stokes imaging polarimetry via random retarder rotation

A high-speed and high-efficiency imaging polarimeter based on ferroelectric liquid crystal retarders: Design and test

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