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Proceedings Paper

Space-qualified liquid-crystal variable retarders for wide-field-of-view coronagraphs
Author(s): N. Uribe-Patarroyo; A. Alvarez-Herrero; 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

Liquid-crystal variable retarders (LCVRs) are an emergent technology for space-based polarimeters, following its success as polarization modulators in ground-based polarimeters and ellipsometers. Wide-field double nematic LCVRs address the high angular sensitivity of nematic LCVRs at some voltage regimes. We present a work in which wide-field LCVRs were designed and built, which are suitable for wide-field-of-view instruments such as polarimetric coronagraphs. A detailed model of their angular acceptance was made, and we validated this technology for space environmental conditions, including a campaign studying the effects of gamma, proton irradiation, vibration and shock, thermo-vacuum and ultraviolet radiation.

Paper Details

Date Published: 7 October 2011
PDF: 12 pages
Proc. SPIE 8148, Solar Physics and Space Weather Instrumentation IV, 814810 (7 October 2011); doi: 10.1117/12.904919
Show Author Affiliations
N. Uribe-Patarroyo, Instituto Nacional de Técnica Aeroespacial (Spain)
A. Alvarez-Herrero, 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, INAF - Osservatorio Astronomico di Torino (Italy)
G. Capobianco, INAF - Osservatorio Astronomico di Torino (Italy)
M. Georges, Univ. de Liège (Belgium)
M. López, Visual Display S.L.L. (Spain)
G. Boer, ARCoptix S.A. (Switzerland)
I. Manolis, European Space Agency, ESTEC (Netherlands)


Published in SPIE Proceedings Vol. 8148:
Solar Physics and Space Weather Instrumentation IV
Silvano Fineschi; Judy Fennelly, Editor(s)

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