TY - GEN
T1 - The Subaru coronagraphic extreme AO (SCExAO) system
T2 - Adaptive Optics Systems II
AU - Garrei, Vincent
AU - Guyon, Olivier
AU - Baudoz, Pierre
AU - Martinache, Frantz
AU - Vogt, Frederic
AU - Takashi, Yoshikawa
AU - Kaito, Yokochi
AU - Cantalloube, Faustine
PY - 2010
Y1 - 2010
N2 - The Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) system is an instrument designed to be inserted between the Subaru AO188 system and the infrared HiCIAO camera in order to greatly improve the contrast in the very close (less than 0.5") neighbourhood of stars. Next to the infrared coronagraphic path, a visible scientific path, based on a EMCCD camera, has been implemented. Benefiting from both Adaptive Optics (AO) correction and new data processing techniques, it is a powerful tool for high angular resolution imaging and opens numerous new science opportunities. We propose here a new image processing algorithm, based on the selection of the best signal for each spatial frequency. A factor 2 to 3 in Střehl ratio is obtained compared to the AO long exposure time depending on the image processing algorithm used and the seeing conditions. The system is able to deliver diffraction limited images at 650 nm (17 mas FWHM).We also demonstrate that this approach offers significantly better results than the classical select, shift and add approach (lucky imaging).
AB - The Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) system is an instrument designed to be inserted between the Subaru AO188 system and the infrared HiCIAO camera in order to greatly improve the contrast in the very close (less than 0.5") neighbourhood of stars. Next to the infrared coronagraphic path, a visible scientific path, based on a EMCCD camera, has been implemented. Benefiting from both Adaptive Optics (AO) correction and new data processing techniques, it is a powerful tool for high angular resolution imaging and opens numerous new science opportunities. We propose here a new image processing algorithm, based on the selection of the best signal for each spatial frequency. A factor 2 to 3 in Střehl ratio is obtained compared to the AO long exposure time depending on the image processing algorithm used and the seeing conditions. The system is able to deliver diffraction limited images at 650 nm (17 mas FWHM).We also demonstrate that this approach offers significantly better results than the classical select, shift and add approach (lucky imaging).
KW - Adaptive optics methods
KW - Data analysis techniques
KW - High angular resolution instrumentation
KW - High angular resolution techniques
KW - Image processing
KW - Instrumentation
UR - https://www.scopus.com/pages/publications/77957830039
UR - https://www.scopus.com/pages/publications/77957830039#tab=citedBy
U2 - 10.1117/12.857874
DO - 10.1117/12.857874
M3 - Conference contribution
SN - 9780819482266
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Adaptive Optics Systems II
Y2 - 27 June 2010 through 2 July 2010
ER -