NACO Quality Control: LAMP FLAT frames

NACO Quality Control:
LAMP FLAT frames

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gain | FPN | lampflux


QC PLOTS
	CURRENT	HISTORY
gain
FPN
lampflux
lampONflux
QC1 database (advanced users): browse \| plot
Click on CURRENT to see the current trending (Health Check). Click on HISTORY to see the historical evolution of the trending.

The LAMP FLAT frames are obtained within the NACO daytime calibrations every night the science data are taken. Each LAMP FLAT consists of 6 raw frames (3 pairs lampON/lampOFF) obtained with the instrumental setup matching the one used for science observations. Only the short wavelength filters are supported. For the long wavelength the "flats on sky" are taken.

The LAMP FLATs are supplied for both imaging and spectroscopy but only the imaging lamp flats are processed by the NACO pipeline.

LAMP FLAT frame - J, S13 This is an example of the master calibration LAMP FLAT frame taken with filter J and camera S13. The Double_RdRstRd read-out and HighDensity detector modes were used. It is a pipeline product of the "naco_img_lampflat" recipe. The bright spot in the upper left quadrant of the frame is a feature characteristic to the camera S13.

LAMP FLAT frame - Ks, S27 This is a master calibration LAMP FLAT frame taken with filter Ks, camera S27. The Double_RdRstRd read-out and HighDensity detector modes were used. It is a pipeline product of the "naco_img_dark" recipe.

top gain

QC1 parameters

parameter	QC1 database: table, name	procedure
"gain":	naco_lampflat, gain	gain calculated by the pipeline recipe naco_img_lampflat

The following trending plot shows the temporal evolution of the detector gain for different read-out modes: DoubleReadResetRead (panel 1) and FowlerNSample (panel 2). Observations in all filters are combined here.

top FPN

QC1 parameters

parameter	QC1 database: table, name	procedure
"fpn": fixed pattern noise	naco_lampflat, fpn	fixed pattern noise calculated by the pipeline recipe naco_img_lampflat

The trending plot shows the fixed pattern noise value calculated for the lampflats by the naco_img_lampflat recipe. It is the largest noise component in the raw frames.

top lampflux

QC1 parameters

parameter	QC1 database: table, name	procedure
"lamp_flux": the flux of the lamp normalized to DIT (ADU/s)	naco_lampflat, lamp_flux	median flux of the difference between the first lampON and the first lampOFF raw frames of the lampflat, divided by DIT; calculated by the naco_img_lampflat recipe.
"flat_med_max":	naco_lampflat, flat_med_max	median of the highest flux values of the raw frames
"flat_med_min":	naco_lampflat, flat_med_min	median of the minimum flux values of the raw frames

The trending plot is used to monitor the performance of the internal lamp. The data points correspond to the median flux of the difference between the first lamp-on and the first lamp-off raw frames, divided by DIT.

The additional lampONflux trending plot shows evolution of the maximum flux of the raw frames with time. This allows to detect possible fading of the internal lamp.