Système optique d'imagerie haut contraste embarqué sur un ballon stratosphérique

Authors: Ouellet, Mireille
Abstract: Several space telescope projects aim to study exoplanets using high-contrast direct imaging techniques. In order to achieve the required difference in contrast between the light from the star and that reflected by the exoplanet, those systems must use a coronagraph to mask the light of the star and correct in real time wavefront errors with adaptive optics techniques.The aberrations are detected by a wavefront sensor, then a control loop sends a command that modifies the surface of a deformable mirror to compensate for the wavefront errors. However, the performance of adaptive optics systems is often limited by the present quasi-static errors that are caused by the optical path difference between the science camera and the wavefront sensor. A high contrast imaging system has been developed to demonstrate the potential of a control technique which enables the reduction of this kind of error. This control loop has the particularity of using a coronagraph which allows the analyze of the wavefront errors directly from the science camera’s image. The optical system developed within the frameworkof this master’s project has been tested in a laboratory and was also optimized to perform afunctional demonstration in space-like conditions during a balloon flight in the stratosphere.The flight results validated the readiness level of some components that could potentially beused for the next generation of space telescopes.
Document Type: Mémoire de maîtrise
Issue Date: 2019
Open Access Date: 29 October 2019
Grantor: Université Laval
Collection:Thèses et mémoires

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