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Proceedings Paper

Recent developments with orthogonal-transfer CCD
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Paper Abstract

We describe recent results from a new type of CCD imager which is capable of transferring charge in all four directions and is called an orthogonal-transfer CCD or OTCCD. This device has applications in adaptive imaging where the image motion is fast in relation to the frame time. We have built a 512 X 512 pixel frame-transfer device in which the imaging section has OT pixels and the frame store has conventional three-phase pixels. We have demonstrated at the Michigan-Dartmouth-MIT (MDM) observatory on Kitt Peak that significant improvements in seeing can be obtained by partially correcting for atmosphere-induced phase distortions using this device. By imaging a bright guide star on the frame store and operating it as a fast- framing tracker we are able to measure the lowest-order distortion. We then use this information to clock the OT section to maintain registration between the charge packets and the shifting star images. The preliminary results show that the OTCCD can remove approximately 0.5 inches in quadrature with the remaining sources of broadening at MDM. Pockets are more numerous in this device than expected, and their effects are exacerbated by the multiple transfers during image tracking. Some evidence has been found that links the pockets to the use of aluminum as the fourth gate level.

Paper Details

Date Published: 25 April 1997
PDF: 8 pages
Proc. SPIE 3019, Solid State Sensor Arrays: Development and Applications, (25 April 1997); doi: 10.1117/12.275182
Show Author Affiliations
Barry E. Burke, MIT Lincoln Lab. (United States)
John L. Tonry, Univ. of Hawaii and Massachusetts Institute of Technology (United States)

Published in SPIE Proceedings Vol. 3019:
Solid State Sensor Arrays: Development and Applications
Morley M. Blouke, Editor(s)

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