28 August 2014 Optical characterization of the breadboard narrowband prefilters for Solar Orbiter PHI
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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.
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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, "Optical characterization of the breadboard narrowband prefilters for Solar Orbiter PHI", Proc. SPIE 9143, Space Telescopes and Instrumentation 2014: Optical, Infrared, and Millimeter Wave, 91435G (28 August 2014); doi: 10.1117/12.2070373; https://doi.org/10.1117/12.2070373
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