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Proceedings Paper

Imaging polarimeters based on liquid crystal variable retarders: an emergent technology for space instrumentation
Author(s): A. Alvarez-Herrero; N. Uribe-Patarroyo; P. García Parejo; J. Vargas; R. L. Heredero; R. Restrepo; V. Martínez-Pillet; J. C. del Toro Iniesta; A. López; S. Fineschi; G. Capobianco; M. Georges; M. López; G. Boer; I. Manolis
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Paper Abstract

The use of Liquid Crystal Variable Retarders (LCVRs) as polarization modulators are envisaged as a promising novel technique for space instrumentation due to the inherent advantage of eliminating the need for conventional rotary polarizing optics hence the need of mechanisms. LCVRs is a mature technology for ground applications; they are wellknow, already used in polarimeters, and during the last ten years have undergone an important development, driven by the fast expansion of commercial Liquid Crystal Displays. In this work a brief review of the state of the art of imaging polarimeters based on LCVRs is presented. All of them are ground instruments, except the solar magnetograph IMaX which flew in 2009 onboard of a stratospheric balloon as part of the SUNRISE mission payload, since we have no knowledge about other spaceborne polarimeters using liquid crystal up to now. Also the main results of the activity, which was recently completed, with the objective to validate the LCVRs technology for the Solar Orbiter space mission are described. In the aforementioned mission, LCVRs will be utilized in the polarisation modulation package of the instruments SO/PHI (Polarimetric and Helioseismic Imager for Solar Orbiter) and METIS/COR (Multi Element Telescope for Imaging and Spectroscopy, Coronagraph).

Paper Details

Date Published: 9 September 2011
PDF: 18 pages
Proc. SPIE 8160, Polarization Science and Remote Sensing V, 81600Y (9 September 2011); doi: 10.1117/12.892732
Show Author Affiliations
A. Alvarez-Herrero, Instituto Nacional de Técnica Aeroespacial (Spain)
N. Uribe-Patarroyo, Instituto Nacional de Técnica Aeroespacial (Spain)
P. García Parejo, Instituto Nacional de Técnica Aeroespacial (Spain)
J. Vargas, Instituto Nacional de Técnica Aeroespacial (Spain)
R. L. Heredero, Instituto Nacional de Técnica Aeroespacial (Spain)
R. Restrepo, Instituto Nacional de Técnica Aeroespacial (Spain)
V. Martínez-Pillet, Instituto de Astrofísica de Canarias (Spain)
J. C. del Toro Iniesta, Instituto de Astrofísica de Andalucía (Spain)
A. López, Instituto de Astrofísica de Andalucía (Spain)
S. Fineschi, Istituto Nazionale di Astronomia (Italy)
G. Capobianco, Istituto Nazionale di Astronomia (Italy)
M. Georges, Univ. de Liège (Belgium)
M. López, Visual Display S.L. (Spain)
G. Boer, Arcoptix S.A. (Switzerland)
I. Manolis, European Space Research and Technology Ctr. (Netherlands)

Published in SPIE Proceedings Vol. 8160:
Polarization Science and Remote Sensing V
Joseph A. Shaw; J. Scott Tyo, Editor(s)

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