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Proceedings Paper

Real-time shift-and-add image sharpening with ALICE
Author(s): Magnus J. Paterson; Phil J. Puxley; Colin Aspin; Joel Sylvester; David Alan Pickup
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Paper Abstract

We describe the shift-and-add performance of ALICE (array limited infrared control environment) with the IRCAM3 near-IR 256 X 256 camera on the UK Infrared Telescope on Mauna Kea, Hawaii. One-hundred-twenty-eight X one-hundred-twenty-eight sub-areas of the array can be read out in shift-and-add mode with exposure times of 20 ms, and observing efficiency of 100%. The system has produced images at K which show several diffraction rings and a central core of FWHM 0.15 arcseconds, and strehl ratios of 0.1 to 0.3 have been observed. At nbL (3.4 microns), strehl ratios of 0.4 have been achieved. Close binary systems (< 0.2 arcseconds) have been well resolved whilst the time-averaged seeing was approximately 0.7 arcseconds. We describe the techniques used to achieve this performance, and present some results of recent observations made using the system as well as giving an overview of current and planned applications of the ALICE system.

Paper Details

Date Published: 6 June 1995
PDF: 12 pages
Proc. SPIE 2475, Infrared Detectors and Instrumentation for Astronomy, (6 June 1995); doi: 10.1117/12.211251
Show Author Affiliations
Magnus J. Paterson, Royal Observatory Edinburgh (United Kingdom)
Phil J. Puxley, Royal Observatory Edinburgh (United Kingdom)
Colin Aspin, Joint Astronomy Ctr. (United States)
Joel Sylvester, Royal Observatory Edinburgh (United Kingdom)
David Alan Pickup, Royal Observatory Edinburgh (United Kingdom)

Published in SPIE Proceedings Vol. 2475:
Infrared Detectors and Instrumentation for Astronomy
Albert M. Fowler, Editor(s)

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