Innovations within the Altair real-time wavefront reconstructor

Leslie K. Saddlemyer; Glen Herriot; Jean-Pierre Vrran; Malcolm Smith; Jennifer Dunn

doi:10.1117/12.552529

25 October 2004 Innovations within the Altair real-time wavefront reconstructor

Leslie K. Saddlemyer, Glen Herriot, Jean-Pierre Vrran, Malcolm Smith, Jennifer Dunn

Proceedings Volume 5490, Advancements in Adaptive Optics; (2004) https://doi.org/10.1117/12.552529
Event: SPIE Astronomical Telescopes + Instrumentation, 2004, Glasgow, United Kingdom

Abstract

The Gemini North adaptive optics system Altair utilises five cooperative CPU's to perform all the associated real-time tasks. One, the reconstructor (RTC), manages all of the highest speed hard real-time duties. As well as the core, computationally intensive, wavefront reconstruction, this processor implements a number of algorithms providing control system support services. These include: the quad-cell centroid gain estimation, determination and subtraction of invisible modes on the deformable mirror, and the blending of tip, tilt and focus from the on instrument wavefront sensors (which exist on all facility Gemini instruments). These associated support tasks are critically important to ensure that the system always runs with an optimal bandwidth and produce stable images with no artefacts such as a waffle pattern or residual non-common path errors. We present the original algorithm that we have developed for the centroid gain estimate and discuss how it is efficiently and conveniently implemented on the hard real-time processor.

Citation Download Citation

Leslie K. Saddlemyer, Glen Herriot, Jean-Pierre Vrran, Malcolm Smith, and Jennifer Dunn "Innovations within the Altair real-time wavefront reconstructor", Proc. SPIE 5490, Advancements in Adaptive Optics, (25 October 2004); https://doi.org/10.1117/12.552529

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