Gemini WFS CCDs and controllers

Details Gemini WFS CCDs and controllers Gemini WFS CCDs and controllers

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998spie.3355..529l&link_type=abstract

Proc. SPIE Vol. 3355, p. 529-538, Optical Astronomical Instrumentation, Sandro D'Odorico; Ed.

Physics

Optics

Scientific paper

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.

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