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| Home > Astronomy > Detectors > EEV12 |
Operational Characteristics
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| Speed | Slow | Fast |
| Bias (ADU) | 1555 | 1482 |
| Gain (e/ADU) | 1.2 | 2.4 |
| Noise range (e) | 4.2 to 5.4 | 6.0 to 9.6 |
| Noise range (ADU) | 3.5 to 4.5 | 2.5 to 4.0 |
| Linear to (ADU)
{see graphs below} |
63K | 63K |
| Readout time (s) | 47 | 30 |
The detector noise will be somewhere in the range of values shown above, these values were measured on the telescope.
Windowing is available.
Linearity
| Vertical CTE | >0.999998 |
| Horizontal CTE | >0.999998 |
Physical Characteristics
| Pixel Scale (isis blue) | 0.19 arcsecs/pixel |
| X Pixel size | 13.5 microns |
| Y Pixel size | 13.5 microns |
| X size in pixels of digitised area | 2148 |
| Y size in pixels of digitised area | 4200 |
| X size of useful imaging area | 2048 |
| Y size of useful imaging area | 4100 |
| X start of useful imaging area | 51 |
| Y start of useful imaging area | 1 |
| LN2 capacity of cryostat | 2.5 litres |
| Cryostat window thickness | 4 mm |
| Distance from window to CCD | 10.0mm measured optically |
| Cryostat window size | 36 x 66 mm |
Operational Parameters
| Operating temperature | 158K |
| Preferred amplifier | Left |
Measured Characteristics
Quantum Efficiency
Full QE curve for EEV4280 in tabulated form,
measured at ATC March 99.
Dark current
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| Full well bloom limit | 240000 electrons |
| Chip flatness | A one dimensional scan down the central column for the CCD showed a 2 micron bow |
| Cosmetics | See Dark frame |
| Cosmic Ray count | ~2000 events/chip/hour at sea level |
| Fringing | See graph of fringe amplitude vs wavelength for EEV12 |
| Top | Back |
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