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Proceedings Paper

Optical PhCCD unit with velocity compensation
Author(s): Alexandre I. Baklanov; V. V. Zhevako; Vladimir I. Karasev; Vjacheslav V. Kolotkov; Vachesluv O. Prasolov; Alexander N. Shumilov
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Paper Abstract

At present photosensitive CCD-array image converters operating in a Time Delay and Integration (TDI) mode are widely used for observation of moving objects. The TDI function makes it possible to improve the sensitivity of imaging devices but at the same time imposes a number of specific constraints on the accuracy of the photodetector orientation relative to the direction of an image velocity vector. Moreover, it requires the image movement o be synchronous with the movement of charge packets generated in the PhCCD photozone. The situation becomes even more complicated if the image converter photozone is not a single photodetector, but consists of photodetectors with a linear (end-to-end) or a staggered arrangement. The linear arrangement is used when an image fragment at the PhCCD photozones boundary can be missed. The staggered arrangement helps avoid such fallouts by partial overlapping of two adjacent photozones, but in this case there is a problem of `stitching' the image obtained from neighboring PhCCD rows physically separated in the photozone plane. In image converters with long photozones, no matter what type of arrangement is taken: the value and direction of the moving image velocity often happen to be different in different photozone areas. Therefore, different velocity and direction of charge transfer within the PhCCD are to be set for these areas to avoid image blurring.

Paper Details

Date Published: 8 April 1996
PDF: 4 pages
Proc. SPIE 2790, Fifth Conference on Charge-Coupled Devices and CCD Systems, (8 April 1996); doi: 10.1117/12.238205
Show Author Affiliations
Alexandre I. Baklanov, OPTEKS Research Institute (Russia)
V. V. Zhevako, OPTEKS Research Institute (Russia)
Vladimir I. Karasev, OPTEKS Research Institute (Russia)
Vjacheslav V. Kolotkov, OPTEKS Research Institute (Russia)
Vachesluv O. Prasolov, OPTEKS Research Institute (Russia)
Alexander N. Shumilov, OPTEKS Research Institute (Russia)

Published in SPIE Proceedings Vol. 2790:
Fifth Conference on Charge-Coupled Devices and CCD Systems
Vladimir A. Karasev; Yuri A. Kuznetsov; Victor A. Shilin, Editor(s)

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