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| QC
PLOTS |
| |
CURRENT |
HISTORY |
| sky
flat structure |
 |
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| 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. |
Sky Flats are taken in imaging mode during
twilight (low gain, 1x1 binning, 2148x2440 window).
QC1 parameters
| parameter |
QC1 database: table, name
|
procedure |
| rms |
vimos_skyflat, sigma_master |
standard deviation of the 1600x1800 central pixels
of the normalised master flat |
| structure |
vimos_skyflat, structure |
The rms of the master can be seen as the combination
of large-scale structure and noise components. The difference between
the master and the master itself shifted by 10x10 pixels is computed
from which the variance of the 1600x1800 central pixels is determined
(corrected by factor 2). This is the combination of fixed-pattern
noise and photon noise. It is quadratically subtracted from the total
standard deviation. |
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