Calibration of Liquid Crystal Visible-light Polarimeter for Metis/Solar Orbiter Coronagraph

被引：2

作者：

Casti, M. ^{[1
]}

Fineschi, S. ^{[1
]}

Capobianco, G. ^{[1
]}

Landini, F. ^{[2
]}

Romoli, M. ^{[3
]}

Antonucci, E. ^{[1
]}

Andretta, V. ^{[4
]}

Naletto, G. ^{[1
,5
]}

Nicolini, G.

Spadaro, D. ^{[6
]}

Alvarez-Herrero, A. ^{[7
]}

Garcia-Parejo, P. ^{[7
]}

Marmonti, M. ^{[8
]}

机构：

[1] INAF Natl Inst Astrophys, Astrophys Observ Torino OATo, Str Osservatorio 20, I-10025 Pino Torinese, TO, Italy

[2] INAF Natl Inst Astrophys, Astrophys Observ Arcetri, Largo E Fermi 5, I-50125 Florence, Italy

[3] Florence Univ, Via Sansone 1, Sesto Fiorentino, Italy

[4] INAF Natl Inst Astrophys, Astrophys Observ Capodimonte Italy, Naples, Italy

[5] Univ Padua, Padua, Italy

[6] INAF Natl Inst Astrophys, Astrophys Observ Catania, Rome, Italy

[7] INTA, Ctra Ajalvir Km 4, E-28850 Madrid, Spain

[8] Optec, Parabiago, Italy

来源：

SPACE TELESCOPES AND INSTRUMENTATION 2018: OPTICAL, INFRARED, AND MILLIMETER WAVE | 2018年 / 10698卷

关键词：

Solar Corona; Coronagraph; Polarization;

D O I：

10.1117/12.2325075

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Metis is the solar coronagraph selected for the payload of the ESA Solar Orbiter mission. Metis will acquire simultaneous imaging in linearly polarized, broadband visible light (580-640 nm) and in the narrow-band HI Ly-alpha line (121.6 nm). The METIS visible light path includes a polarimeter, designed to observe and analyse the K-corona linearly polarized by Thomson scattering. The polarimeter comprises a liquid crystal Polarization Modulation Package (PMP) together with a quarter-wave retarder and a linear polarizer. The Metis PMP consists of two Anti-Parallel Nematic Liquid Crystal Variable Retarders (LCVRs) with their fast axis parallel with respect to each other and a pre-tilted angle of the molecules in opposite direction. The LCVRs provide an electro-optical modulation of the input polarized light by applying an electric field to the liquid crystal molecules inside the cells. A given optical retardance can be induced in the LCVRs by selecting a suitable voltage value. This presentation will report the polarimetric characterization of the Flight Model of the Metis polarimeter and the voltage-to-retardance calibration.

引用

页数：14

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