Journal Article

Active optics Shack–Hartmann sensor: using spot sizes to measure the seeing at the focal plane of a telescope

P. Martinez, J. Kolb, M. Sarazin and J. Navarrete

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 421, issue 4, pages 3019-3026
Published in print April 2012 | ISSN: 0035-8711
Published online April 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.20527.x
Active optics Shack–Hartmann sensor: using spot sizes to measure the seeing at the focal plane of a telescope

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Nowadays, the real‐time seeing estimation at the focus of a telescope is strongly emphasized because this knowledge virtually drives the dimensioning of adaptive optics systems and the operational aspects of instruments. In this context, we study the importance of using images from an active optics Shack–Hartmann (AOSH) sensor to provide accurate estimates of the seeing. At the critical location of the focus of the telescope, the AOSH sensor delivers long‐exposure spot point spread functions, which are directly related to the atmospheric seeing in the line of sight. Although AOSH sensors are specified to measure not spot sizes but slopes, we show that an accurate estimation of the seeing can be obtained from AOSH images using a dedicated algorithm. We analyse the sensitivity of two algorithms and compare them to various parameters in a systematic way, demonstrating that an efficient estimation of the seeing can be obtained by adequate means.

Keywords: atmospheric effects; methods: data analysis; methods: numerical; site testing

Journal Article.  5548 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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