Active optics in Large Synoptic Survey Telescope

Ming Liang; Victor Krabbendam; Charles F. Claver; Srinivasan Chandrasekharan; Bo Xin

doi:10.1117/12.926519

17 September 2012 Active optics in Large Synoptic Survey Telescope

Ming Liang, Victor Krabbendam, Charles F. Claver, Srinivasan Chandrasekharan, Bo Xin

Proceedings Volume 8444, Ground-based and Airborne Telescopes IV; 84444Q (2012) https://doi.org/10.1117/12.926519
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

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.

Citation Download Citation

Ming Liang, Victor Krabbendam, Charles F. Claver, Srinivasan Chandrasekharan, and Bo Xin "Active optics in Large Synoptic Survey Telescope", Proc. SPIE 8444, Ground-based and Airborne Telescopes IV, 84444Q (17 September 2012); https://doi.org/10.1117/12.926519

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