EUV and soft x-ray telescope-spectrometer for imaging spectroscopy on the Solar Orbiter mission: grazing-incidence configuration

Luca Poletto; Giuseppe Tondello; Massimo Landini

doi:10.1117/12.450077

10 December 2001 EUV and soft x-ray telescope-spectrometer for imaging spectroscopy on the Solar Orbiter mission: grazing-incidence configuration

Luca Poletto, Giuseppe Tondello, Massimo Landini

Author Affiliations +

Proceedings Volume 4498, UV/EUV and Visible Space Instrumentation for Astronomy and Solar Physics; (2001) https://doi.org/10.1117/12.450077
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

Abstract

The optical design of a stigmatic grazing-incidence telescope-spectrometer for solar imaging spectroscopy is presented. The instrument is designed for the Solar Orbiter mission. It consists of a double telescope and a flat-field spectrometer. The telescope 1 is a single-element telescope: it focuses the radiation on the entrance slit of the spectrometer only in the direction perpendicular to the slit, i.e. the spectral dispersion plane. The telescope 2 is a double-element Wolter telescope: it focuses the radiation on the focal plane in the direction parallel to the slit, i.e. perpendicular to the spectral dispersion plane. Finally, the spectrometer consists of a grazing-incidence variable-line-spaced grating with flat-field properties. The telescope 2 is crossed with respect to the telescope 1 and the grating, i.e. it is mounted with its tangential plane coincident with the grating equatorial plane. The spectrum is acquired by a detector at near normal incidence with respect to the direction of the exit beam. Such unique configuration gives stigmatic monochromatic images of extended regions even in the grazing-incidence domain.

Citation Download Citation

Luca Poletto, Giuseppe Tondello, and Massimo Landini "EUV and soft x-ray telescope-spectrometer for imaging spectroscopy on the Solar Orbiter mission: grazing-incidence configuration", Proc. SPIE 4498, UV/EUV and Visible Space Instrumentation for Astronomy and Solar Physics, (10 December 2001); https://doi.org/10.1117/12.450077

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