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L'imageur Interférométrique de Fresnel: un instrument spatial pour l'observation à haute résolution angulaire

Abstract : The Fresnel Interferometric Imager is a concept of space-based telescope aiming to dramatically increase the high angular resolution and high dynamic range imaging capabilities in the ultraviolet, visible and infrared wavelength domains.

This telescope uses as entrance pupil not a reflective or refractive device (mirror or lens), but instead an interferometric one, involving hundreds thousands of "basic" subapertures. These are mere holes punched in a large and thin foil. Their positioning law, which is close to but different from that of a Soret zone plate, causes focalisation (beam combination) by diffraction and interference. This optical scheme strongly reduces manufacturing and positioning constraints. However, as this entrance pupil is nothing but a special kind of diffraction grating, a focal module is needed to form an achromatic image onto a final focal plane.

The first part of this thesis studies the needs and designs of the Fresnel Interferometric Imager constituting elements, and presents the associated performances and limitations. The second part describes a breadboard project which I had the opportunity to develop and work on, illustrating experimentally the efficiency of this concept. Finally, the third part presents some possible astrophysical targets for a wide aperture Fresnel Imager.
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https://tel.archives-ouvertes.fr/tel-00242674
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Submitted on : Wednesday, February 6, 2008 - 2:48:35 PM
Last modification on : Thursday, October 15, 2020 - 4:07:13 AM
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Denis Serre. L'imageur Interférométrique de Fresnel: un instrument spatial pour l'observation à haute résolution angulaire. Astrophysique [astro-ph]. Université Paul Sabatier - Toulouse III, 2007. Français. ⟨tel-00242674⟩

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