| Dark median
QC1 database (advanced users):
Dark frames are taken about once a month in SCI1.0 read-out mode.
All QC parameters are computed for each IFU detector.
||QC1 database: table, name
| QC.DARK.MASTER.MEDIAN || muse_dark..master_median ||Median value of the master dark||HC|| || [docuSys coming] |
|*Class: KPI - instrument performance; HC - instrument health; CAL - calibration quality; ENG - engineering parameter|
**There might be more than one.
dark current is trended for each IFU detector
separately. The median value computed in ADU/hr/pix is monitored.
Scoring&thresholds DARK level
The dark_median is tightly scored, with dynamic
thresholds following the median average of the current
period. The only requirement on the dark current is stability on the calibration timescale.
| February 2014 || dark calibrations are taken regularly|
| 2015-03-31 || CHAN01 detector vessel exchanged, DET.CHIP.ID changed from psyche to egeria|
| 2015-10-31 || After intervention (detectors warmed up and vacuum recreated in the transfer lines) dark level in all quadrants back to normal values; PPRS-063339|
Algorithm DARK level
Processing trims the raw data and records the overscan statistics, subtracts the bias (taking account of the
overscan, if --overscan is not "none") from each raw input image, converts them from adu to count, scales them
according to their exposure time, and combines them using input parameters. The combined image is normalized to 1 hour
exposure time. The median level of master dark is calculated for
each detector (i.e. channel/IFU).