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L'Imageur diffractif de Fresnel : Validation le ciel depuis le sol et l'observation spatial pour à Haute Résolution Angulaire

Abstract : The Fresnel Array is a diffractive focalization instrument developed to be applied for space observation in astrophysics. It implies long-focal length focusing, thus, formation flying in space. During my thesis, the concept has been tested with ground-based prototypes and validated by measuring the image quality and instruments functionalities. Since 2007, a second generation Fresnel Diffractive imager prototype has been built, and operates on a 18 meter long refractor tube. 200x200 mm square Fresnel arrays have been constructed, tested with ground-based observation of astrophysical targets, and upgraded to demonstrate that they meet the quality for space applications at large array size : 4m. Observations are made in Nice since June 2009. They prove that the concept is working in real conditions, The collected data and the consequent images demonstrate the functionality and quality of Fresnel diffractive Imager. The first part of this thesis introduces the principle of Fresnel diffractive Imaging and its design. The specifications of the components in the system present the nominal performance. The second part describes the tests made to validate the instrument concept and demonstrate the high dynamic range imaging, the observation results, and the optimization of the ground-based prototype. The last part proposes a space mission, providing the space observations configurations. A target such as an accretion disc around a young star is shown as a study case for a Fresnel space mission with 20x20 meter arrays, opening new domains of astrophysics in the ultra violet.
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Truswin Raksasataya. L'Imageur diffractif de Fresnel : Validation le ciel depuis le sol et l'observation spatial pour à Haute Résolution Angulaire. Planète et Univers [physics]. Université Paul Sabatier - Toulouse III, 2010. Français. ⟨tel-00577925⟩

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