Rosin, M. Etienne (2023) Study of non-common path aberrations in GRAVITY and their impact in narrow-angle astrometry PFE - Project Graduation, ENSTA.
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Abstract
Long-baseline interferometry is a powerful tool to achieve high-angular resolution observations. GRAVITY, an infrared interferometer at the Very Large Telescope Interferometer, allows for narrow-angle astrometry. In a context of improving its performances, we propose to study the non common path aberrations occurring within one of its sub systems: the Fiber Coupler. We measured the optical aberrations on each Off-Axis Parabola of the Fiber Coupler, as they affect the metrology of GRAVITY. To verify the performances of the Fiber Couplers, we replicated a prototype and conceived a phase-shifting interferometry method to measure the aberrations along the whole optical path of the Fiber Coupler. Our study provides insights in the mitigation of the impact of non-common path aberrations on GRAVITY’s performances and suggests ways to improve them.
Item Type: | Thesis (PFE - Project Graduation) |
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Uncontrolled Keywords: | Phase-Shifting Interferometry |
Subjects: | Physics, Optics |
ID Code: | 9544 |
Deposited By: | Etienne ROSIN |
Deposited On: | 29 août 2023 14:04 |
Dernière modification: | 29 août 2023 14:04 |
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