WFPC2 Instrument Handbook for Cycle 10
 |
 |
 |
 |
|
Документ взят из кэша поисковой машины. Адрес
оригинального документа
: http://www.stsci.edu/instruments/wfpc2/Wfpc2_hand2/ch4_ccd7.html
Дата изменения: Tue Aug 29 22:07:30 2000 Дата индексирования: Sat Dec 22 17:01:57 2007 Кодировка: |
|
| WFPC2 Instrument Handbook for Cycle 10 | |||
|
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.
|
Space Telescope Science Institute http://www.stsci.edu Voice: (410) 338-1082 help@stsci.edu |
| |
|
|
|