Quality Control: Image flats

ISAAC Quality Control:
check flats

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raw frame parameters | difference frame parameters | ratio frame parameters


QC PLOTS
	CURRENT	HISTORY
RAW parameters
DIFFERENCE parameters
RATIO parameters
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.

Image flats (also called check flats) are measured as technical calibrations daily as part of the ISAAC calibration plan in three different setups:

ARM=SW/Hawaii, FILTER=NB_1.06, camera=S2, DIT/NDIT=4.0/4, READ=DoubleCorr. The setup SW S2 is used in imaging mode.
ARM=LW/Aladdin, FILTER=NB=1.64, camera=L2, DIT/NDIT=4.0/4, READ=DoubleCorrLowBias. The setup LW L2 is used for imaging science OBs in jitter mode. The pixel scale is 0.148
ARM=LW/Aladdin, FILTER=NB=1.64, camera=L3, DIT/NDIT=4.0/4, READ=DoubleCorrLowBias. The setup LW L3 is used for imaging science OBs in chopping mode. The pixel scale is 0.017.

The check flats provide a quick health check of the instrument, in particular for the imaging mode. Furthermore detector features like debris are easily detected on the raw frames.

2008-01-01: There is no pipeline support for the single checkflat raw frames. The following preliminary service is provided by QC Garching:

The first checkflat of a year is used a reference checkflat with assigned PRO.CATG=REF_CHECKFLAT.
We divide the current checkflat by the reference checkflat and assign the PRO.CATG=RATiO_CHECK_FLAT to the product of the QC script. We subtract the reference checkflat from the current checkflat and assign the PRO.CATG=DIFF_CHECKFLAT to the product of the QC script.
several QC parameters are defined and measured on the raw frame and on both products.
All checkflats from 2006-01-01 have been processed backwards, and the QC1 parameters have been ingested into the QC1 DB.
The products will not be ingested into the master calibration archive.

Find here an example DIFF_CHECKFLAT product in early 2007 with a short time difference to the reference checkflat and one of late 2007 with a long time difference to the checkflat.

SW-arm, Hawaii detector, S2 camera : Jan 2007: Dec 2007:
LW-arm, Aladdin detector, L2 camera: Jan 2007 Dec 2007:
LW-arm, Aladdin detector, L3 camera: Feb 2007 Dec 2007:

The service is preliminary and subject of review.

top raw frame parameters

Only simple statistical parameters are extracted from checkflat raw frames. Five 100x100 pixel size windows are defined. The location is outlined in the following image:

QC1 parameters

parameter	QC1 database: table, name	procedure
raw frame intensity and standard deviation from detector window	isaac_checkflat, qc_cc_med, qc_cc_stdev	- For the following 100x100 window on the raw frame [x1,y1:x2,y2] = [462, 462 : 562, 562] the median and the standard deviation is derived from the sample of 10000 pixel. The window is in the center [512:512] of the detector
raw frame intensity and standard deviation from detector window	isaac_checkflat, qc_ul_med, qc_ul_stdev	- For the following 100x100 window on the raw frame [x1,y1:x2,y2] = [50, 874 : 150, 974] the median and the standard deviation is derived from the sample of 10000 pixel. The window is in the upper left corner of the detector with 50 pixel distance from the edges.
raw frame intensity and standard deviation from detector window	isaac_checkflat, qc_ur_med, qc_ur_stdev	- For the following 100x100 window on the raw frame [x1,y1:x2,y2] = [874, 874 : 974, 974] the median and the standard deviation is derived from the sample of 10000 pixel. The window is in the upper right corner of the detector with 50 pixel distance from the edges.
raw frame intensity and standard deviation from detector window	isaac_checkflat, qc_ll_med, qc_ll_stdev	- For the following 100x100 window on the raw frame [x1,y1:x2,y2] = [50, 50 : 150, 150] the median and the standard deviation is derived from the sample of 10000 pixel. It window is in the lower left corner of the detector with 50 pixel distance from the edges.
raw frame intensity and standard deviation from detector window	isaac_checkflat, qc_lr_med, qc_lr_stdev	- For the following 100x100 window on the raw frame [x1,y1:x2,y2] = [874, 50 : 974, 150] the median and the standard deviation is derived from the sample of 10000 pixel. It window is in the lower right corner of the detector with 50 pixel distance from the edges.
Relative intensities.	isaac_checkflat, qc_ul_ratio, qc_ur_ratio, qc_ll_ratio, qc_lr_ratio	A simple ratio of two parameters: qc_ul_ratio = qc_ul_med / qc_cc_med, qc_ur_ratio = qc_ur_med / qc_cc_med, qc_ll_ratio = qc_ll_med / qc_cc_med, qc_lr_ratio = qc_lr_med / qc_cc_med

Trending

Hawaii S2 raw frame medians - discontinued beginning of 2009
Hawaii S2 raw frame standard deviations - discontinued beginning of 2009
Hawaii S2 raw frame intensity ratios - discontinued beginning of 2009
Aladdin L2 raw frame medians - discontinued beginning of 2009
Aladdin L2 raw frame standard deviations - discontinued beginning of 2009
Aladdin L2 raw frame intensity ratios - discontinued beginning of 2009

Aladdin L3 raw frame medians - discontinued end of 2008

Aladdin L3 raw frame standard deviations - discontinued end of 2008

Aladdin L3 raw frame intensity ratios - discontinued end of 2008

top parameters from checkflat difference frames

Only simple statistical parameters are extracted from frame : checkflat minus the reference checkflat. . Five 100x100 pixel size windows are defined. The windows have the same size as used for the checkflat raw frames, but the locals are in the center of the detector quadrants instead of being pushed closer to the detector edge as used for the raw frame checkflats. The location is outlined in the following image:

QC1 parameters

parameter	QC1 database: table, name	procedure
raw frame intensity and standard deviation from detector window	isaac_checkflat, qc_cc_D_med, qc_cc_D_stdev	- For the following 100x100 window on the raw frame [x1,y1:x2,y2] = [462, 462 : 562, 562] the median and the standard deviation is derived from the sample of 10000 pixel. The window is in the center [512:512] of the detector
raw frame intensity and standard deviation from detector window	isaac_checkflat, qc_ul_D_med, qc_ul_D_stdev	- For the following 100x100 window on the raw frame [x1,y1:x2,y2] = [206, 718 : 306, 818] the median and the standard deviation is derived from the sample of 10000 pixel. The window is in the center of the upper left detector quadrant.
raw frame intensity and standard deviation from detector window	isaac_checkflat, qc_ur_D_med, qc_ur_D_stdev	- For the following 100x100 window on the raw frame [x1,y1:x2,y2] = [718, 718 : 818, 818] the median and the standard deviation is derived from the sample of 10000 pixel. The window is in the center of the upper right detector quadrant.
raw frame intensity and standard deviation from detector window	isaac_checkflat, qc_ll_D_med, qc_ll_D_stdev	- For the following 100x100 window on the raw frame [x1,y1:x2,y2] = [206, 206 : 306, 306] the median and the standard deviation is derived from the sample of 10000 pixel. It window is in the center of the lower left detector quadrant.
raw frame intensity and standard deviation from detector window	isaac_checkflat, qc_lr_D_med, qc_lr_D_stdev	- For the following 100x100 window on the raw frame [x1,y1:x2,y2] = [718, 206 : 818, 306] the median and the standard deviation is derived from the sample of 10000 pixel. It window is in the center of the lower right detector quadrant.

Trending

Hawaii S2 product frame medians - discontinued beginning of 2009
Hawaii S2 product frame standard deviations - discontinued beginning of 2009
Aladdin L2 product frame medians - discontinued beginning of 2009
Aladdin L2 product frame standard deviations - discontinued beginning of 2009
Aladdin L3 product frame medians - discontinued beginning of 2009
Aladdin L3 product frame standard deviations - discontinued beginning of 2009

History

As the reference checkflat frame is updated in the first January days of each year, there is a natural offset in all QC parameters derived from the product frames.

top parameters from checkflat ratio frames

Only simple statistical parameters are extracted from frame : checkflat divided by the reference checkflat. Five 100x100 pixel size windows are defined. The windows have the same size as used for the checkflat raw frames, but the locals are in the center of the detector quadrants instead of being pushed closer to the detector edge as used for the raw frame checkflats. The location is outlined in the following image:

QC1 parameters

parameter	QC1 database: table, name	procedure
raw frame intensity and standard deviation from detector window	isaac_checkflat, qc_cc_R_med, qc_cc_R_stdev	- For the following 100x100 window on the raw frame [x1,y1:x2,y2] = [462, 462 : 562, 562] the median and the standard deviation is derived from the sample of 10000 pixel. The window is in the center [512:512] of the detector
raw frame intensity and standard deviation from detector window	isaac_checkflat, qc_ul_R_med, qc_ul_R_stdev	- For the following 100x100 window on the raw frame [x1,y1:x2,y2] = [206, 718 : 306, 818] the median and the standard deviation is derived from the sample of 10000 pixel. The window is in the center of the upper left detector quadrant.
raw frame intensity and standard deviation from detector window	isaac_checkflat, qc_ur_R_med, qc_ur_R_stdev	- For the following 100x100 window on the raw frame [x1,y1:x2,y2] = [718, 718 : 818, 818] the median and the standard deviation is derived from the sample of 10000 pixel. The window is in the center of the upper right detector quadrant.
raw frame intensity and standard deviation from detector window	isaac_checkflat, qc_ll_R_med, qc_ll_R_stdev	- For the following 100x100 window on the raw frame [x1,y1:x2,y2] = [206, 206 : 306, 306] the median and the standard deviation is derived from the sample of 10000 pixel. It window is in the center of the lower left detector quadrant.
raw frame intensity and standard deviation from detector window	isaac_checkflat, qc_lr_R_med, qc_lr_R_stdev	- For the following 100x100 window on the raw frame [x1,y1:x2,y2] = [718, 206 : 818, 306] the median and the standard deviation is derived from the sample of 10000 pixel. It window is in the center of the lower right detector quadrant.

Trending

Hawaii S2 product frame medians - discontinued beginning of 2009
Hawaii S2 product frame standard deviations - discontinued beginning of 2009

Aladdin L2 product frame medians - discontinued beginning of 2009

Aladdin L2 product frame standard deviations - discontinued beginning of 2009

Aladdin L3 product frame medians - discontinued beginning of 2009

Aladdin L3 product frame standard deviations - discontinued beginning of 2009

History

As the reference checkflat frame is updated in the first January days of each year, there is a natural offset in all QC parameters derived from the product frames.