WFPC2 Instrument Handbook for Cycle 11
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Дата изменения: Tue Sep 4 21:44:46 2001 Дата индексирования: Sat Dec 22 17:03:08 2007 Кодировка: Поисковые слова: http www.badastronomy.com phpbb index.php |
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| WFPC2 Instrument Handbook for Cycle 11 | |||
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Quantum Efficiency Hysteresis
The problem of quantum efficiency hysteresis (QEH) due to back-side charge accumulation has been reviewed in detail by Griffiths, et al. (1989), and Janesick and Elliot (1991). QEH is not present in the Loral CCDs, because they are front-side illuminated and incorporate MPP operation. This has been verified in component tests at JPL. The absence of QEH means that the devices do not need to be UV-flooded and so decontamination procedures are planned without the constraint of maintaining the UV-flood.
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