Assessing VLT-UT science image quality from active optics Shack-Hartmann spot patterns

Julio Navarrete; Johan Kolb; Gianluca Lombardi; Lothar Noethe; Marc Sarazin

doi:10.1117/12.2055736

22 July 2014 Assessing VLT-UT science image quality from active optics Shack-Hartmann spot patterns

Julio Navarrete, Johan Kolb, Gianluca Lombardi, Lothar Noethe, Marc Sarazin

Proceedings Volume 9145, Ground-based and Airborne Telescopes V; 91450C (2014) https://doi.org/10.1117/12.2055736
Event: SPIE Astronomical Telescopes + Instrumentation, 2014, Montréal, Quebec, Canada

Abstract

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.

Citation Download Citation

Julio Navarrete, Johan Kolb, Gianluca Lombardi, Lothar Noethe, and 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); https://doi.org/10.1117/12.2055736

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KEYWORDS

Turbulence

Wavefront sensors

Image quality

Active optics

Telescopes

Atmospheric corrections

Diffraction

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