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NACO
QC LampFlat: GENERAL | CONICA raw frames
taken with the lamp flat recipe come in series of 6 frames in an alternating lamp=ON,
lamp=OFF manner. Instrument related parameters are the camera, the filter and
the read out mode. The lampflat recipe generates three QC parameters: GAIN, FixedPatternNoise
and LampEfficiency. See the User Manual for details. Other quality checks are
performed by post-pipeline processing scripts. - PRODUCT_PLOT.
This means that for each lampflat pipeline product and its associated raw frames
we create a plot with the most significant features.
- PRODUCT
DIFFERENCE FRAME. The visual check includes the product frame, the difference
between the product to be checked and the last taken product with the same instrument
settings (= last coherent frame), and the difference with the a reference frame,
taken at the beginning of instrument operations; which will be updated from time
to time (e.g. once a year or after major interventions).
- QC1
PARAMETER CROSS CHECK. This means that selected QC1 parameters are compared
with the most recently obtained corresponding QC1 parameters.
- TRENDING. This means that we
store all qc1 parameters and build Run Charts which simply show the parameter
as a function of time over a larger time interval.
NACO product files
follow a certain naming convention. |
| PRODUCT
PLOT |
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There follows for each lampflat product type a QC1 plot. The Figure caption
is equal for all four plots.
Figure caption
The median (collapsed) column of the product and of the reference product; the
column at X=500 of the product frame. | The median (collapsed)
row of the product at Y=500 and Y=600 of the product frame. | Flux
of the six raw input frames. | Zoomed: The median (collapsed)
column of the product and of the reference product; the column at X=500 of the
product frame. | Median column, X=500 column, Y=500 row and
Y=600 row of the (master-reference) frame. | Histogram of the
lamp flat product and of the reference product. |
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![[top]](../img/arr1red-up.gif) | PRODUCT
DIFFERENCE FRAMES |
| Difference
frames are a quick look tool to visualize structural changes within the optical
components, such as changes in the camera position, vignetting by the mask or
large scale changes (e.g. particles in the optical path). |
![[top]](../img/arr1red-up.gif) | TRENDIND
PLOTS |
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Trending describes the variation of a QC1 parameter within a large time
range. We show a time range of 4 months and generate 4 trending plots a year.
The following QC1 parameters are determined and trended.
- LF_STD =
flat lamp frame standard deviation as derived from the eclipse command stcube.
Note that the J filter shows a larger STD than all other filters.
LF_STD
(gif | ps)
- gain
as delivered by the lampflat recipe of the pipeline.
gain
(gif | ps)
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FPN = fixed pattern noise as delivered by the lamp flat recipe:
FPN
(gif | ps)
- LampEff
= flat lamp efficiency (lamp aging) as delivered by the lamp flat recipe:
LampEff
(gif | ps)
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