Etude des principes d’acquisition et de traitement des images optiques pour l’observation spatiale

Abstract

Primary mirrors of space telescopes are of crucial importance in imaging. They must offer the best compromise between mass, cost, stiffness, and performance. Over the past decades, several materials and architectures have been developed to reduce their weight while maintaining an acceptable level of performance. In this thesis, we propose new innovative cellular core architectures for lightweight mirrors of space telescopes, offering better optomechanical performance than classical honeycomb-core lightweight mirrors. First, we explored some local reinforcement strategies to improve the performance of a honeycomb-core mirror, achieving enhancements of up to 22.07%. Next, we investigated the use of hierarchical honeycomb cores, which led to substantial improvements of 33.60%. Finally, we developed new architectures of entangled multidirectional corrugated cores for lightweight mirrors of space telescopes, resulting in improvements of 33.56%.