Quality Control and
Data Processing

HC PLOTS
non-uniformity
uniformity
max deviation
QC1 database (advanced users): browse | plot

Spectroscopic twilight (sky) flats are measured in each spectral band once every month. They are used within the pipeline to create illumination correction images per IFU in order to account for different efficiencies of the IFU slices.

Sky flat exposure. Example frame in the H band.

QC1_parameters

FITS key	QC1 database: table, name	definition	class*	HC_plot**	more docu
QC.SPAT.MAX.NONUNIF	kmos_skyflat..spat_max_nonunif	max. std. dev. of illumination correction [ADU]	CAL		[docuSys coming]
QC.SPAT.UNIF	kmos_skyflat..spat_unif	uniformity of illumination [ADU}	CAL		[docuSys coming]
QC.SPAT.MAX.DEV	kmos_skyflat..spat_maxdev	maximum deviation from uniformity [ADU]	CAL		[docuSys coming]
*Class: KPI - instrument performance; HC - instrument health; CAL - calibration quality; ENG - engineering parameter **There might be more than one.

Trending

The three QC parameters spat_unif, spat_max_nonunif, and spat_maxdev are trended separately for each spectral band.

Scoring&thresholds Spatial uniformity

The spat_max_nonunif parameter is scored because it is the most sensitive parameter for detecting outlying measurements. Thresholds have been set empirically.

History

No notable events happened so far.

Algorithm Spatial uniformity

spat_max_nonunif: largest rms of the illumination correction images of all IFUs
spat_unif: total rms of all illumination correction images
spat_maxdev: mean illumination correction of the most deviating IFU