KEYWORDS: Telescopes, Stars, Sensors, Zemax, Wavefront sensors, Cameras, Wavefronts, Active optics, Ray tracing, Signal to noise ratio, Wavefront reconstruction
The 4-meter wide-field telescope VISTA will be upgraded with the 4MOST fiber-fed spectrograph. The future field diameter will be 2.5° (before 1.65°) with fast optics of F/3.3, therefore the mechanical alignment tolerances are tight. ESO is currently refurbishing the active optics system based on curvature wavefront sensing, using four technical cameras defocused by ±1.2 mm that image four different stars. We describe the algorithm that computes the telescope misalignment using least-squares fitting, the ESO-developed package Sensitizer that generates sensitivity matrices and we discuss maximum likelihood methods.
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