Translator Disclaimer
10 July 2018 Fast cadence speckle-free high-contrast imaging: SFADI and SFI
Author Affiliations +
Abstract
We present the R and D status of the Speckle-Free Angular Differential Imaging method (SFADI), that we developed for the SHARK-VIS high-contrast imager for the LBT telescope. The technique bases on the acquisition of kHz frame-rate image sequences, which we combine in post-processing after speckle identification and suppression in each frame. With respect to the standard angular differential imaging, this method reaches a much smoother residual background and hence higher detection contrast at a given signal-to-noise ratio. Furthermore, it can reveal faint extended sources around bright central stars, and can use de-rotated images as well as quick second-lasting sequences. We reached a contrast of around 10-5 for integration times of the order of tens of minutes at 100 mas for a 5.7th magnitude star, as we demonstrated on both a real-sky acquisition and at the SHARK-VIS laboratory test bench. Such long sequences though produces a large amount of data (around a million frames every 15 minutes) that we manage to processed in a reasonable computation time with the described implementation scheme.
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
G. Li Causi, M. Stangalini, S. Antoniucci, F. Pedichini, M. Mattioli, V. Testa, and R. Piazzesi "Fast cadence speckle-free high-contrast imaging: SFADI and SFI", Proc. SPIE 10703, Adaptive Optics Systems VI, 107032U (10 July 2018); doi: 10.1117/12.2312614; https://doi.org/10.1117/12.2312614
PROCEEDINGS
14 PAGES


SHARE
Advertisement
Advertisement
Back to Top