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• W2025672546 abstract "Nulling interferometry is still a promising method to characterize spectra of exoplanets. One of the main issues is to cophase at a nanometric level each arm despite satellite disturbances. The bench PERSEE aims to prove the feasibility of that technique for spaceborne missions. After a short description of PERSEE, we will first present the results obtained in a simplified configuration: we have cophased down to 0.22 nm rms in optical path difference (OPD) and 60 mas rms in tip/tilt, and have obtained a monochromatic null of 3E-5 stabilized at 3E-6. The goal of 1 nm with additional typical satellite disturbances requires the use of an optimal control law; that is why we elaborated a dedicated Kalman filter. Simulations and experiments show a good rejection of disturbances. Performance of the bench should be enhanced by using a Kalman control law, and we should be able to reach the desired nanometric stability. Following, we will present the first results of the final polychromatic configuration, which includes an achromatic phase shifter, perturbators and optical delay lines. As a conclusion, we give the first more general lessons we have already learned from this experiment, both at system and component levels for a future space mission." @default.
• W2025672546 created "2016-06-24" @default.
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• W2025672546 date "2010-07-16" @default.
• W2025672546 modified "2023-09-23" @default.
• W2025672546 title "PERSEE: experimental results on the cophased nulling bench" @default.
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• W2025672546 doi "https://doi.org/10.1117/12.856867" @default.
• W2025672546 hasPublicationYear "2010" @default.
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