Pyramid wavefront sensing in the presence of thick spiders

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dc.contributor.authorEngler B
dc.contributor.authorWeddell S
dc.contributor.authorMiska LL
dc.contributor.authorChristoph V
dc.contributor.authorClare R
dc.date.accessioned2019-11-17T23:05:40Z
dc.date.available2019-11-17T23:05:40Z
dc.date.issued2019en
dc.date.updated2019-11-14T01:03:42Z
dc.description.abstractOne of the challenges faced by the adaptive optics systems on extremely large telescopes, such as the European Extremely Large Telescope (EELT), is the pupil segmentation caused by the secondary mirror support structure (spider). We introduce a sensitivity metric to evaluate the sensitivity of the pyramid wavefront sensor to segment piston and propose a hybrid control method where both modulated and unmodulated pyramid wavefront sensor measurements are used. The modulated measurements correct the bulk of the atmospheric turbulence whilst the unmodulated measurements are used to correct the residual segment piston errors. Our hybrid approach provides a 5.6% improvement in Strehl under poor seeing (r0 =10 cm ) and 2.7% improvement under good seeing conditions (r0 =20 cm).en
dc.identifier.citationEngler B, Weddell S, Miska LL, Christoph V, Clare R (2019). Pyramid wavefront sensing in the presence of thick spiders. Quebec City, Canada: Adaptive Optics for Extremely Large Telescopes 6. 09/06/2019-14/06/2019. http://ao4elt6.copl.ulaval.ca/proceedings.html.en
dc.identifier.urihttp://hdl.handle.net/10092/17621
dc.language.isoen
dc.subjectwavefront sensingen
dc.subjectadaptive opticsen
dc.subjectpyramid wavefront sensoren
dc.subjectEELTen
dc.subjectpetalingen
dc.subjectsegment pistonen
dc.subject.anzsrcField of Research::02 - Physical Sciences::0201 - Astronomical and Space Sciences::020102 - Astronomical and Space Instrumentationen
dc.subject.anzsrcField of Research::09 - Engineering::0906 - Electrical and Electronic Engineering::090605 - Photodetectors, Optical Sensors and Solar Cellsen
dc.subject.anzsrcField of Research::09 - Engineering::0906 - Electrical and Electronic Engineering::090606 - Photonics and Electro-Optical Engineering (excl. Communications)en
dc.subject.anzsrcField of Research::09 - Engineering::0906 - Electrical and Electronic Engineering::090602 - Control Systems, Robotics and Automationen
dc.titlePyramid wavefront sensing in the presence of thick spidersen
dc.typeConference Contributions - Publisheden
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