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| QC PLOTS |
| PUPIL: |
CURRENT |
HISTORY |
| centroid and offset |
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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. |
Pupil images are created in order to verify the alignment
of the instrument along the telescope's cassegrain axis. Images are,
of course, made without any dispersive elements along the optical path.
Pupil images are routinely obtained
at approximately one week intervals during SINFONI operations.
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A
SINFONI pupil image (median of reconstructed cube). The UT4 primary
mirror and the support spider of the secondary mirror are readily
visible. |
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A
SINFONI quality control assessment page.
top left: Current
pupil image under investigation (master reconstructed cube).
Centroid QC fit shown as dotted white line.
top center: Reference
pupil image (reconstructed cube).
top right: Difference
between current pupil image and reference pupil.
bottom left: Difference
between beginning of pupil cube (plane 100 at 1.95 um) and end
of pupil cube (plane 2118 at 2.45 um). This checks for any large
alignment shifts as a function of wavelength.
bottom right: Current
pupil image (master reconstructed cube) inverted and filtered around
a first-guess centroid moment. It is on this image that the gaussian
fit is made (shown as the dotted line). |
top
PUPIL parameters trended
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QC1 plots
The QC1 plots for the SINFONI PUPIL show the:
- absolute centroid position
of pupil (in pixels)
- relative offset from
pupil center (in pixels)
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A
SINFONI pupil QC1 plot.
The top two panels show the
trending of the absolute x and y-axes gaussian fit to the pupil
center (in pixels). These values are computed by a QC python
script (as described in the table below).
The lower two panels show the
trending of the relative x and y-axes centroid
offsets of the pupil (in pixels). These values are computed by
the SINFONI pipeline (as described in the table below).
In both plots, the median values over 180 days are
show as solid lines, while the optimal values (32, 32) and (0, 0),
respectively, are shown with a dotted line. |
QC1 parameters trended
| Page |
Parameter |
Table: Name (QC1 database) |
Description of Procedure |
1 |
pupil absolute center position |
sinfoni_pupil: qc.pupil.centerx & qc.pupil.centery |
QCsinfo_pupil.py: A
first-guess centroid is determined by computing weighted moments.
Around this point the image is filtered to remove a possible
truncated edge (i.e. present in any less than perfectly aligned
image), and a flux-weighted gaussian fit is applied to the cleaned
image. This parameter has been monitored since 2008-01-22.
|
2 |
pupil offset from center |
sinfoni_pupil: qc.pupil0.shiftx & qc.pupil0.shifty |
SINFONI pipeline: The
pupil images are processed using the sinfo_rec_jitter recipe and
a simple centroid position (weighted average) is computed on the
stacked cube. |
Trending and Issues
The pupil image should be as well centered
in the SINFONI field of view as possible. For the reconstructed cube
image, this implies a pupil center at pixel values: (32, 32). Deviations
of no more than about 10 pixels in either axis can be tolerated.
History
SINFONI pupil images are scrutinized following any instrument
intervention or removal from the telescope. During normal operations
the pupil generally remains quite stable.
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