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Quality Control and
Data Processing

CAL | HC | refs | QC
Trending & QC1
MUSE ...
QC links:
MUSE: Dark
Dark median
QC1 database (advanced users): browse | plot

Dark frames are taken about once a month in SCI1.0 read-out mode.

All QC parameters are computed for each IFU detector.

DARK level


FITS key QC1 database: table, name definition class* HC_plot** more docu
QC.DARK.MASTER.MEDIAN muse_dark..master_median Median value of the master darkHC [docuSys coming]
*Class: KPI - instrument performance; HC - instrument health; CAL - calibration quality; ENG - engineering parameter
**There might be more than one.


The 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.


Date event
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).

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