Optical alignment of the solar orbiter eui flight instrument

Mazzoli, A.; Halain, J. -P.; Auchère, F.; Barbay, J.; Meining, Stefan; Philippon, A.; Morinaud, G.; Roose, S.; Hellin, M. -L.; Jacques, L.; Schühle, Udo; Dumesnil, C.; Mercier, R.; Renotte, E.; Rochus, P.

doi:10.1117/12.2535979

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Optical alignment of the solar orbiter eui flight instrument

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Meining, Stefan
Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;

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Schühle, Udo
Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;

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Citation

Mazzoli, A., Halain, J.-.-P., Auchère, F., Barbay, J., Meining, S., Philippon, A., et al. (2019). Optical alignment of the solar orbiter eui flight instrument. In ICSO 2018 - International Conference on Space Optics.

Cite as: https://hdl.handle.net/21.11116/0000-0006-6843-A

Abstract

The Extreme Ultraviolet Imager (EUI) instrument for the Solar Orbiter mission will image the solar corona in the extreme ultraviolet (17.1 nm and 30.4 nm) and in the vacuum ultraviolet (121.6 nm). It is composed of three channels, each one containing a telescope.

Two of these channels are high resolution imagers (HRI) at respectively 17.1 nm (HRI-EUV) and 121.6 nm (HRI-Ly∝), each one composed of two off-axis aspherical mirrors. The third channel is a full sun imager (FSI) composed of one single off-axis aspherical mirror and working at 17.1 nm and 30.4 nm alternatively. This paper presents the optical alignment of each telescope.

The alignment process involved a set of Optical Ground Support Equipment (OGSE) such as theodolites, laser tracker, visible-light interferometer as well as a 3D Coordinates Measuring Machine (CMM).

The mirrors orientation have been measured with respect to reference alignment cubes using theodolites. Their positions with respect to reference pins on the instrument optical bench have been measured using the 3D CMM. The mirrors orientations and positions have been adjusted by shimming of the mirrors mount during the alignment process.

After this mechanical alignment, the quality of the wavefront has been checked by interferometric measurements, in an iterative process with the orientation and position adjustment to achieve the required image quality.