Bibcode
Louis, R. E.; Bayanna, A. R.; Socas Navarro, H.
Referencia bibliográfica
Advances in Space Research, Volume 60, Issue 7, p. 1547-1556.
Fecha de publicación:
10
2017
Revista
Número de citas
0
Número de citas referidas
0
Descripción
The chromosphere is a highly complex and dynamic layer of the Sun, that
serves as a conduit for mass and energy supply between two, very
distinct regions of the solar atmosphere, namely, the photosphere and
corona. Inferring magnetic fields in the chromosphere, has thus become
an important topic, that can be addressed with large-aperture solar
telescopes to carry out highly sensitive polarimetric measurements. In
this article, we present a design of a polarimeter for investigating the
chromospheric magnetic field. The instrument consists of a number of
lenses, two ferro-electric liquid crystals, a Wollaston prism, and a CCD
camera. The optical design is similar to that of a commercial zoom lens
which allows a variable f# while maintaining focus and aberrations well
within the Airy disc. The optical design of the Adaptable ChRomOspheric
POLarimeter (ACROPOL) makes use of off-the-shelf components and is
described for the 70 cm Vacuum Tower Telescope and the 1.5 m GREGOR
telescope at Observatorio del Teide, Tenerife, Spain. Our design shows
that the optical train can be separated into two units where the first
unit, consisting of a single lens, has to be changed while going from
the VTT to the GREGOR configuration. We also discuss the tolerances
within which, diffraction limited performance can be achieved with our
design.
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