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Proceedings Paper

Active optics in Large Synoptic Survey Telescope
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Paper Abstract

The Large Synoptic Survey Telescope (LSST) has a 3.5º field of view and F/1.2 focus that makes the performance quite sensitive to the perturbations of misalignments and mirror surface deformations. In order to maintain the image quality, LSST has an active optics system (AOS) to measure and correct those perturbations in a closed loop. The perturbed wavefront errors are measured by the wavefront sensors (WFS) located at the four corners of the focal plane. The perturbations are solved by the non-linear least square algorithm by minimizing the rms variation of the measured and baseline designed wavefront errors. Then the correction is realized by applying the inverse of the perturbations to the optical system. In this paper, we will describe the correction processing in the LSST AOS. We also will discuss the application of the algorithm, the properties of the sensitivity matrix and the stabilities of the correction. A simulation model, using ZEMAX as a ray tracing engine and MATLAB as an analysis platform, is set up to simulate the testing and correction loop of the LSST AOS. Several simulation examples and results are presented.

Paper Details

Date Published: 17 September 2012
PDF: 13 pages
Proc. SPIE 8444, Ground-based and Airborne Telescopes IV, 84444Q (17 September 2012); doi: 10.1117/12.926519
Show Author Affiliations
Ming Liang, National Optical Astronomy Observatory (United States)
Victor Krabbendam, National Optical Astronomy Observatory (United States)
Charles F. Claver, National Optical Astronomy Observatory (United States)
Srinivasan Chandrasekharan, National Optical Astronomy Observatory (United States)
Bo Xin, 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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