Paper
6 August 2010 On-sky results of the ZEUS phasing sensor, closed-loop precision in the context of multi-wavelength measurements
Author Affiliations +
Abstract
The Active Phasing Experiment (APE) was designed to test four different phasing techniques and to validate wavefront control concepts for Extremely Large Telescopes. One of the sensors is the ZErnike Unit for Segment phasing (ZEUS), which was successfully tested on-sky along with the rest of the APE experiment at one of the Nasmyth platforms of the Very Large Telescope (VLT) in 2009. During the four observing campaigns, multiple results were obtained in open-loop and in closed-loop at different wavelengths. We present in this paper an analysis of the multi-wavelength data in terms of piston measurement precision at the edges of the segments and on the reconstructed wavefront, and an analysis of the evolution of these errors in successive closed-loop runs at different wavelengths. This work demonstrates how the applied multi-wavelength algorithm leads to convergence, allowing phasing of segments with piston errors of several microns.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
A. Vigan, K. Dohlen, I. Surdej, N. Yaitskova, and F. Gonte "On-sky results of the ZEUS phasing sensor, closed-loop precision in the context of multi-wavelength measurements", Proc. SPIE 7733, Ground-based and Airborne Telescopes III, 773353 (6 August 2010); https://doi.org/10.1117/12.857142
Advertisement
Advertisement
RIGHTS & PERMISSIONS
Get copyright permission  Get copyright permission on Copyright Marketplace
KEYWORDS
Error analysis

Metrology

Image segmentation

Mirrors

Sensors

Wavefronts

Calibration

RELATED CONTENT

Fast optical re-phasing of segmented primary mirrors
Proceedings of SPIE (July 22 2014)
Design and end-to-end modelling of a deployable telescope
Proceedings of SPIE (September 25 2017)
Wind loading of large telescopes
Proceedings of SPIE (February 04 2003)

Back to Top