On-sky Testing of the Active Phasing Experiment

Details On-sky Testing of the Active Phasing Experiment On-sky Testing of the Active Phasing Experiment

Jun 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009msngr.136...25g&link_type=abstract

The Messenger, vol. 136, p. 25-31

Physics

Scientific paper

The Active Phasing Experiment (APE) has been used by ESO to gain experience in controlling segmented primary mirrors in preparation for the European Extremely Large Telescope. The experiment tested various phasing techniques and explored their advantages and limitations. Four optical phasing sensors were developed using different techniques — a curvature sensor, a pyramid sensor, a Shack-Hartmann sensor and a sensor based on a modified Mach-Zehnder interferometer. The design of the APE instrument is described. APE was installed at the VLT visitor focus for on-sky testing and a brief summary of the results of the experiment is given.

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