Documentation of QC procedures: procedure flat_scr_qc_2CCD.prg for FORS1

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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bias_qc_2CCD.prg dark_qc_2CCD.prg detmon_qc.prg
flat_scr_qc_2CCD.prg lamp_std_qc_2CCD.prg lamp_lss_qc_2CCD.prg lamp_mos_qc_2CCD.prg
flat_sky_qc_2CCD.prg std_ima_qc_2CCD.prg std_lss_qc_2CCD.prg std_mos_qc_2CCD.prg
sci_img_qc_2CCD.prg sci_lss_qc_2CCD.prg sci_mos_qc_2CCD.prg
 
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NAME flat_scr_qc_2CCD.prg
VERSION 1.0 -- taken from FORS1 to FORS2
1.1 -- adapted for two FORS2 CCDs with different field-of-view
1.2 -- taken from FORS2 to FORS1
1.3 -- adapted for new imaging pipeline (2008-03-19)
SYNTAX MIDAS
CALL measureQuality
from $DFS_PRODUCT/FLAT_scr/$DATE:
inmidas -P -j "@@ $DFO_PROC_DIR/flat_scr_qc_2CCD.prg $date $PF"
INSTRUMENT FORS1
RAWTYPE FLAT_SCR
PURPOSE compares raw and product FLAT_SCR files for FORS1 QC assessment; the plots are later reviewed within certifyProducts. The plot (flat_scr_grap1.png) is stored as Postscript file in $DFO_PLT_DIR.
PROCINPUT first raw flat from AB; MASTER_SCREEN_FLAT_IMG product;
QC1TABLE trending | table(s) in QC1 database:
fors1_scrflat_2CCD
TRENDPLOT trending | HealthCheck plot(s) associated to this procedure:
trend_report_CONAD_2CCD_HC.html | trend_report_SCR_FF_UB_2CCD_HC.html
QC1PAGE trending | associated documentation:
scrflat_2CCD_qc1.html
QC1PLOTS
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flat_scr_grap1.png
left: comparison master (red) <-> raw (black);
upper panel: middle row and middle column, full pixel range, in ADU;
lower panel: middle row and middle column, central 100 pixels, in ADU
top right: ratio master/reference
left panel: central row/column, full pixel range
right panel: central row/column, central pixel range
bottom right: histogram: all pixel values of master skyflat in log frequency histogram

flat_scr_disp1.png
full display of master frame

flat_scr_disp2.png
full display of 1st raw frame

flat_scr_disp3.png
full display of ratio master/reference
QC1PARAM QC1 parameters written into QC1 table:
QC1db names: datancom | median_master | sigma_master
FITS key names: DATANCOM | (flat_scr_qc.prg) | (flat_scr_qc.prg)
QC1db names: efficiency | fixp_noise | FPN_rel | phot_noise
FITS key names: QC.FLAT.EFF | QC.FLAT.FPN | QC.FLAT.FPN.REL | QC.FLAT.PHN
QC1db names: conad | conad_err
FITS key names: QC.FLAT.CONAD | QC.FLAT.CONADERR
QC1 params created by pipeline: datancom, conad, conad_err, efficiency, fixed-pattern noise (absolute and relative), photon noise
QC1 params created by this procedure: median_master, sigma_master
ALGORITHM Description of algorithms:
median_master: median level of master screen flat within X200...1800, Y400...800 (MIDAS stat/ima; outputr(8))
sigma_master: std.dev. of master screen flat within X200...1800, Y400...800 (MIDAS stat/ima; outputr(4))
CERTIF Reasons for rejection:
- unusual structure;
Smooth, large scale variations, individual bright/dark spots in the central area of the ratio master/reference are no reason for rejection.
For the U band the master/reference sometimes shows some circular structure, probably due to the LADC not being in its proper park position. This is no cause for rejection.
COMMENTS
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