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Proceedings Paper

Optical characterization of the breadboard narrowband prefilters for Solar Orbiter PHI
Author(s): Carlos Dominguez-Tagle; Thierry Appourchaux; Claudia Ruiz de Galarreta; Jean-Jacques Fourmond; Anne Philippon; Jean-Christophe Le Clec'h; Mehdi Bouzit; Véronique Bommier; Regis Le Cocguen; Daniel Crussaire; Jean-Marie Malherbe
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Paper Abstract

The Polarimetric and Helioseismic Imager (PHI) on board of Solar Orbiter will observe the Sun to measure the photospheric vector magnetic field and the line-of-sight velocity. It will employ a narrowband filtergraph (FG) to scan the FeI 6173 Å absorption line. At different spectral positions, the polarization state of the incoming light will be analyzed. The FG will provide a tuning range to scan the line, the continuum, and to compensate for the spacecraft radial velocity, as it will approach to the Sun down to 0.28 AU. The FG includes a Fabry-Perot etalon and two narrowband prefilters. The bandpass of the narrowest one has a nominal Full Width at Half Maximum (FWHM) of 2.7 Å. The measurement of the prefilters characteristics is essential for the instrument calibration. Here we present the results of the breadboard prefilters characterization, which is an important milestone in the development of the instrument.

Paper Details

Date Published: 28 August 2014
PDF: 6 pages
Proc. SPIE 9143, Space Telescopes and Instrumentation 2014: Optical, Infrared, and Millimeter Wave, 91435G (28 August 2014); doi: 10.1117/12.2070373
Show Author Affiliations
Carlos Dominguez-Tagle, Institut d'Astrophysique Spatiale, CNRS, Univ. Paris Sud 11 (France)
Thierry Appourchaux, Institut d'Astrophysique Spatiale, CNRS, Univ. Paris Sud 11 (France)
Claudia Ruiz de Galarreta, Institut d'Astrophysique Spatiale, CNRS, Univ. Paris Sud 11 (France)
Jean-Jacques Fourmond, Institut d'Astrophysique Spatiale, CNRS, Univ. Paris Sud 11 (France)
Anne Philippon, Institut d'Astrophysique Spatiale, CNRS, Univ. Paris Sud 11 (France)
Jean-Christophe Le Clec'h, Institut d'Astrophysique Spatiale, CNRS, Univ. Paris Sud 11 (France)
Mehdi Bouzit, Institut d'Astrophysique Spatiale, CNRS, Univ. Paris Sud 11 (France)
Véronique Bommier, LESIA, Observatoire de Paris, CNRS (France)
Regis Le Cocguen, LESIA, Observatoire de Paris, CNRS (France)
Daniel Crussaire, LESIA, Observatoire de Paris, CNRS (France)
Jean-Marie Malherbe, LESIA, Observatoire de Paris, CNRS (France)


Published in SPIE Proceedings Vol. 9143:
Space Telescopes and Instrumentation 2014: Optical, Infrared, and Millimeter Wave
Jacobus M. Oschmann; Mark Clampin; Giovanni G. Fazio; Howard A. MacEwen, Editor(s)

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