22 July 2014 Assessing VLT-UT science image quality from active optics Shack-Hartmann spot patterns
Author Affiliations +
A one year database has been gathered from the VLT active optics Shack-Hartmann (S-H) wavefront sensor images taken at each operating focus about every 30 seconds. The VLT telescope control software includes a dedicated code to extract the median full width at half maximum of the unvignetted S-H spots which is used for this study. This code applies a 1-D fit, assuming circular Hartmann spots, which allows to work only on foci equipped with atmospheric dispersion correction, or when the telescopes are observing close to zenith. The S-H image size measured inside the 30m enclosures is compared the outside seeing measured at 6m above ground by the VLT Astronomical Site Monitor (DIMM). A method for correcting DIMM measurements from surface layer turbulence contamination is proposed.
© (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Julio Navarrete, Julio Navarrete, Johan Kolb, Johan Kolb, Gianluca Lombardi, Gianluca Lombardi, Lothar Noethe, Lothar Noethe, Marc Sarazin, Marc Sarazin, } "Assessing VLT-UT science image quality from active optics Shack-Hartmann spot patterns", Proc. SPIE 9145, Ground-based and Airborne Telescopes V, 91450C (22 July 2014); doi: 10.1117/12.2055736; https://doi.org/10.1117/12.2055736


Adaptive optics in China
Proceedings of SPIE (July 18 1999)
VST: from commissioning to science
Proceedings of SPIE (September 16 2012)
WIYN active optics: a platform for AO
Proceedings of SPIE (September 10 1998)
Active optics at UKIRT
Proceedings of SPIE (August 24 1998)
Seeing experiments with the WIYN 3.5-m Telescope
Proceedings of SPIE (August 01 2000)

Back to Top