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9 July 2008 Combination of two Fabry-Perot etalons and a grating spectrograph for imaging polarimetry of the Sun
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Abstract
Imaging spectroscopy of the Sun is a challenging task usually performed with Fabry-Perot etalons. The common setup is a combination of two or three etalons in series and a narrow-band prefilter. The requirement of one, usually expensive prefilter for every desired wavelength limits the number of spectral regions that can be observed. We present a novel instrument combination consisting of two Fabry-Perot etalons and a grating spectrograph, which allows for observations in any wavelength between 390 nm and 660 nm without the need for narrow-band prefilters. Furthermore, two or more adjacent monochromatic images are projected on the detector, each image corresponding to a different spectral transmission peak of the Fabry-Perot filtergraph. Together with our Zurich Imaging Polarimeter (ZIMPOL) the system is installed at the telescope of the Istituto Ricerche Solari Locarno (IRSOL) where it will be used for two-dimensional spectropolarimetry. We present a description of the instrument and test observations.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Lucia Kleint, Alex Feller, and Michele Bianda "Combination of two Fabry-Perot etalons and a grating spectrograph for imaging polarimetry of the Sun", Proc. SPIE 7014, Ground-based and Airborne Instrumentation for Astronomy II, 701414 (9 July 2008); https://doi.org/10.1117/12.787923
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