QC documentation system: QC procedure QCocam_shutter.py for OMEGACAM

This documentation is intended both for QC scientists and SciOps astronomers (who may want to ignore the technical information displayed in grey).
 
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QCocam_qcheck.py QCocam_shutter.py QCocam_readnoise.py QCocam_lingain.py
QCocam_bias.py QCocam_dark.py QCocam_dome.py QCocam_flat.py
QCocam_std.py QCocam_sci.py
 
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NAME QCocam_shutter.py
VERSION 1.0 -- 2012-06-10 First draft of this QC report
SYNTAX Python
CALL measureQuality of data contained in $DFS_PRODUCT/DOME_SHUTTERTEST/$DATE
within processQC: processQC -a $AB
explicit call: QCocam_qcheck.py -a [$AB_name] -i [$level_of_interaction: 0-2]
INSTRUMENT OMEGACAM
RAWTYPE DOME_SHUTTERTEST (DPR.TYPE = FLAT,DOME,SHUTTERTEST)
PURPOSE a) generates 1 QC report for ALL OmegaCAM CCD's
b) writes QC1 parameters into local QC1 database omegacam_shutter
PROCINPUT No input is required:
a) $DATE is read from AB
b) the primary file is set in QCocam_shutter.py and is the PRO.CATG=SHUTTER_UP product with the _0000.fits extension.
c) raw frames are implicitly read from the AB.
d) All reference products: SHUTTER_UP and SHUTTER_DOWN are found and read in from $DFO_ROOT_DIR_FC/calib/references/DOME_SHUTTERTEST/.
QC1TABLE trending | table(s) in QC1 database:
omegacam_shutter
TRENDPLOT trending | HealthCheck plot associated to this procedure: none
QC1PAGE trending | associated documentation:
shutter_QC1.html
QC1PLOTS
top

shutter.png
SHUTTER homogeneity QC report 1 . . . for all detectors:
top: the average over all >16,000 pixels of the 8 row CCDs of the OmegaCAM array. The current row average is shown as blue (shutter travel: UP) and green (shutter travel: DOWN) lines. The reference row average is shown as red lines.
The ratio of the two shutter travel directions for the current frame is shown as a black line offset by 0.10. A homogeneous shutter travel time in either direction would result in this line being very flat.
Least-square fits to these lines and their ratios are indicated in the frame legend along with a measure of the computed shutter inhomogeneity (in percent).
bottom: a normalized histogram of the flux counts associated with the two shutter travel directions. The blue histogram is for the shutter UP travel, the green histogram for the shutter DOWN travel (both histograms should be very similar), and the black histogram is the ratio of the two (it should straddle 1.00).
QC1PARAM QC1 parameters written into QC1 table(omegacam_shutter) 
SOURCE(header/script)      DBNAME                 value        description

 PRO.DATANCOM              datancom                2           the number of raw files combined in pipeline processing
 QCocam_shutter.py         qc_shutter_residual     0.03232     the median residual between the two shutter travel directions (QC script)
 QCocam_shutter.py         qc_shutter_residual_err 0.000453    the error in median residual between the two shutter travel directions (QC script)
 QCocam_shutter.py         qc_shutter_timing       -0.053      the shutter timing inhomogeneity (ratio between both directions of travel) (%) (QC script)
 QCocam_shutter.py         qc_temp_mosaic_plate    146.5       the average temperature probe of mosaic plates from DET.TLM5/8 (QC script)
ALGORITHM
CERTIF - Any inhomogeneity in the shutter travel in either direction will result in a ratio of the row averages (black line in QC report) having a significant slope. Furthermore, the comparison with the reference traces will be apparent.
- Shutter timing homogeneity must be better than +/-0.2% at exposures of 1 second.
COMMENTS The OmegaCAM shutter test is executed roughly every 90 days. It consists of four dome flats of 10 and 0.1 seconds with the shutter travelling in one direction, and the second dome flat pair (again 10 and 0.1 second exposures) is made with the shutter blades travelling in the other direction (up and down). The pipeline divides each long exposure by its corresponding short exposure, normalizes the result, and then averages along the row direction (i.e. perpendicular to the direction of shutter travel along the axis of the 8 OmegaCAM CCDs) resulting in two fits table files with the average flux level in each of 16,384 row pixels.
Any differences in the two dome flat ratios can be attributed to an inhomogeneity in the travel speed of the shutter blades.
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