Optimization and co-phasing of an aperture synthesis instrument dedicated to highly constrasted and resolved direct imaging : the Temporal HyperTelescope
type: Dataset
description: Thanks to high angular resolution abilities, the hypertelescope concept forms a promising way to develop new astronomical instruments. However, its feasibility have to be experimentally demonstrated and especially a solution to the cophasing problem has to be found. This is the aim of this PHD work. In the XLIM laboratory, we have developed a fibered hypertelescope prototype called Temporal HyperTelescope (THT). The concept of this height-telescope-instrument is detailed in the first chapter of this document. A study of the instrument defaults has been carried out to evaluate its theoretical imaging abilities. In a second step, a cophasing system has been implemented. It is based on a joint use of a genetic algorithm and the phase diversity technique. Its efficiency has been experimentally validated in laboratory thanks to the acquisition of a binary star image showing a 9.1 magnitude unbalance and requiring a 3-nanometer-optical-path-lengh-resolution. Then, we have tested this method in the photon counting regime and the experimental results demonstrate that the instrument is able to acquire images even in these extreme running conditions. Finally, the last chapter of this document gives few points to be improved and suggests a draft of space based instrument which could be realized in the next decade.
issued: 2026-05-09T11:36:43.240117
language: fr
modified: 2026-05-09T11:36:43.240121
contact point: Organization
  fn: CCSD
keyword: algorithme-genetique
keyword: asservissement
keyword: cophasage
keyword: cophasing
keyword: diversite-de-phase
keyword: genetic-algorithm
keyword: high-contrast-imaging
keyword: high-resolution-imaging
keyword: hypertelescope
keyword: imagerie-haut-contraste
keyword: imagerie-haute-resolution
keyword: infoeu-reposemanticsdoctoralthesis
keyword: interferometrie
keyword: interferometry
keyword: phase-diversity
keyword: physastrimphysics-physicsastrophysics-astro-phinstrumentation-and-methods-for-astrophysic
keyword: sduastrimsciences-of-the-universe-physicsastrophysics-astro-phinstrumentation-and-methods
keyword: servo-loop-control
keyword: theses
landing page: https://theses.hal.science/tel-00870029

Optimization and co-phasing of an aperture synthesis instrument dedicated to highly constrasted and resolved direct imaging : the Temporal HyperTelescope
type: Distribution
format: HTML
issued: 2026-05-09T11:36:43.248316
modified: 2026-05-09T11:36:43.221347
access URL: https://theses.hal.science/tel-00870029

test_moissonnage_selune
type: Agent