Gemini WFS CCDs and controllers

Brian Leckie; Tim Hardy

doi:10.1117/12.316761

9 July 1998 Gemini WFS CCDs and controllers

Brian Leckie, Tim Hardy

Proceedings Volume 3355, Optical Astronomical Instrumentation; (1998) https://doi.org/10.1117/12.316761
Event: Astronomical Telescopes and Instrumentation, 1998, Kona, HI, United States

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.

Citation Download Citation

Brian Leckie and Tim Hardy "Gemini WFS CCDs and controllers", Proc. SPIE 3355, Optical Astronomical Instrumentation, (9 July 1998); https://doi.org/10.1117/12.316761

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