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Proceedings Paper

The on-chip guiding system of the wide-field infrared camera at CFHT
Author(s): Loic Albert; Martin Riopel; Douglas Teeple; Jeff Ward; Greg Barrick
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Paper Abstract

The Canada-France-Hawaii Telescope (CFHT) is commissioning a new Wide field Infrared Camera (WIRCam) that uses a mosaic of 4 HAWAII-2RG near-infrared detectors manufactured by Rockwell. At the heart of the instrument is an On-Chip Guiding System (OCGS) that exploits the unique parallel science/guide frame readout capability of the HAWAII-2RG detectors. A small subsample of each array is continuously read at a rate of 50 Hz while the integration of the science image is ongoing with the full arrays. Each of these guiding windows is centered on a star to provide an error signal for the telescope guiding. An Image Stabilizer Unit (ISU) (i.e. a tip-tilt silica plate), provides the corrections. A Proportional Integral Differential (PID) closed loop controls the ISU such that telescope tracking is corrected at a rate of 5 Hz. The guide window size and readout rate are adjustable but typical numbers are 8×8-16×16 boxes read at 50 or 1.5 Hz. This paper presents the technical architecture of the guiding system and performance measurements on the sky with WIRCam.

Paper Details

Date Published: 7 September 2005
PDF: 8 pages
Proc. SPIE 5881, Infrared and Photoelectronic Imagers and Detector Devices, 58810A (7 September 2005); doi: 10.1117/12.617533
Show Author Affiliations
Loic Albert, Canada-France-Hawaii Telescope Corp. (United States)
Martin Riopel, Univ. de Montreal (Canada)
Douglas Teeple, Canada-France-Hawaii Telescope Corp. (United States)
Jeff Ward, Canada-France-Hawaii Telescope Corp. (United States)
Greg Barrick, Canada-France-Hawaii Telescope Corp. (United States)


Published in SPIE Proceedings Vol. 5881:
Infrared and Photoelectronic Imagers and Detector Devices
Randolph E. Longshore, Editor(s)

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