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Proceedings Paper

Gemini WFS CCDs and controllers
Author(s): Brian Leckie; Tim Hardy
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Paper Abstract

The Gemini telescopes implement active optics and atmospheric tip-tilt-focus correction through the use of a number of Shack-Hartmann wavefront sensors at several locations and providing various orders of wavefront data. All are based on a common Charge Coupled Device (CCD) housing and controller. This paper provides an overview of the electronics in the CCD head and controller. The two frame-transfer CCDs that are used (80 X 80 and 1024 X 1024), are described. A parameter based multiple subaperture readout algorithm is presented. The system is capable of operating at 2000 frames per second in a 2 X 2 subaperture mode with 36 pixels per subaperture and a read-noise floor of approximately 4.5 erms.

Paper Details

Date Published: 9 July 1998
PDF: 10 pages
Proc. SPIE 3355, Optical Astronomical Instrumentation, (9 July 1998); doi: 10.1117/12.316761
Show Author Affiliations
Brian Leckie, Dominion Astrophysical Observatory (Canada)
Tim Hardy, Dominion Astrophysical Observatory (Canada)

Published in SPIE Proceedings Vol. 3355:
Optical Astronomical Instrumentation
Sandro D'Odorico, Editor(s)

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