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Proceedings Paper

Italian panoramic monochromator for the THEMIS telescope: the first results and instrument evaluation
Author(s): Fabio Cavallini; Francesco Berrilli; Bruno Caccin; Sergio Cantarano; Guido Ceppatelli; Alberto Egidi; Alberto Righini
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Paper Abstract

We briefly describe the design and the characteristics of the Italian Panoramic Monochromator installed at the focal plane of the THEMIS telescope built in Izana by a joint venture of the French and Italian National Research Councils. The Panoramic Monochromator substantially is a narrow band filter (approximately equals 22 mAngstrom bandwidth) tunable on the visible spectrum for quasi simultaneous bidimensional spectrometry of the solar atmosphere. The narrow bandwidth is obtained by using a non standard birefringent filter and a Fabry Perot interferometer mounted in series. This assembly has the advantage of the spectral purity of one channel of the Fabry Perot interferometer and a very large free spectral range. Moreover the spectral stability depends on the interferometer, the environment of which may be carefully controlled. The design of this instrument is not really new, but, only now it has been possible to build it thanks to the development of servo controlled Fabry Perot interferometers, which are stable in time and may easily be tuned. The system seems to perform well. It is stable in wavelength and the spectral pass band and stray light are within the expected values, as it may be deduced by very preliminary tests performed at the THEMIS Telescope and in Arcetri (Firenze) at the 'G. B. Donati' solar tower.

Paper Details

Date Published: 9 July 1998
PDF: 7 pages
Proc. SPIE 3355, Optical Astronomical Instrumentation, (9 July 1998); doi: 10.1117/12.316809
Show Author Affiliations
Fabio Cavallini, Osservatorio Astrofisico di Arcetri (Italy)
Francesco Berrilli, Univ. degli Studi di Roma II (Italy)
Bruno Caccin, Univ. degli Studi di Roma II (Italy)
Sergio Cantarano, Univ. degli Studi di Roma II (Italy)
Guido Ceppatelli, Osservatorio Astrofisico di Arcetri (Italy)
Alberto Egidi, Univ. degli Studi di Roma II (Italy)
Alberto Righini, Univ. degli Studi di Firenze (Italy)


Published in SPIE Proceedings Vol. 3355:
Optical Astronomical Instrumentation
Sandro D'Odorico, Editor(s)

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