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Proceedings Paper

Prototype pipeline for LSST wavefront sensing and reconstruction
Author(s): Charles F. Claver; Srinivasan Chandrasekharan; Ming Liang; Bo Xin; Enver Alagoz; Kirk Arndt; Ian P. Shipsey
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Paper Abstract

The Large Synoptic Survey Telescope (LSST) uses an Active Optics System (AOS) to maintain system alignment and surface figure on its three large mirrors. Corrective actions fed to the LSST AOS are determined from 4 curvature based wavefront sensors located on the corners of the inscribed square within the 3.5 degree field of view. Each wavefront sensor is a split detector such that the halves are 1mm on either side of focus. In this paper we describe the development of the Active Optics Pipeline prototype that simulates processing the raw image data from the wavefront sensors through to wavefront estimation on to the active optics corrective actions. We also describe various wavefront estimation algorithms under development for the LSST active optics system. The algorithms proposed are comprised of the Zernike compensation routine which improve the accuracy of the wavefront estimate. Algorithm development has been aided by a bench top optical simulator which we also describe. The current software prototype combines MATLAB modules for image processing, tomographic reconstruction, atmospheric turbulence and Zemax for optical ray-tracing to simulate the closed loop behavior of the LSST AOS. We describe the overall simulation model and results for image processing using simulated images and initial results of the wavefront estimation algorithms.

Paper Details

Date Published: 27 September 2012
PDF: 14 pages
Proc. SPIE 8444, Ground-based and Airborne Telescopes IV, 84444P (27 September 2012); doi: 10.1117/12.926472
Show Author Affiliations
Charles F. Claver, National Optical Astronomy Observatory (United States)
Srinivasan Chandrasekharan, National Optical Astronomy Observatory (United States)
Ming Liang, National Optical Astronomy Observatory (United States)
Bo Xin, Purdue Univ. (United States)
Enver Alagoz, Purdue Univ. (United States)
Kirk Arndt, Purdue Univ. (United States)
Ian P. Shipsey, Purdue Univ. (United States)


Published in SPIE Proceedings Vol. 8444:
Ground-based and Airborne Telescopes IV
Larry M. Stepp; Roberto Gilmozzi; Helen J. Hall, Editor(s)

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