Plot
? |
Symb
? |
Source
* |
Average ? |
Thresholds ? |
N_
data |
QC1
parameter |
Data
downloads |
Remarks |
| method |
value |
unit |
method |
value |
| 1 |
• | QC1DB |
MEDIAN |
0.0478 |
ratio/FOV |
VAL | -0.02,0.08 |
18 |
xgradient |
this |
last_yr |
all
|
x-gradient over 1024 pixel, S13, J |
| 2 |
• | QC1DB |
MEDIAN |
0.0267 |
ratio/FOV |
VAL | -0.02,0.08 |
20 |
xgradient |
this |
last_yr |
all
|
x-gradient over 1024 pixel, S13, H |
| 3 |
• | QC1DB |
MEDIAN |
0.0181 |
ratio/FOV |
VAL | -0.02,0.08 |
40 |
xgradient |
this |
last_yr |
all
|
x-gradient over 1024 pixel, S13, Ks |
| 4 |
• | QC1DB |
MEDIAN |
0.0874 |
ratio/FOV |
VAL | 0.02,0.12 |
18 |
ygradient |
this |
last_yr |
all
|
y-gradient over 1024 pixel, S13, J |
| 5 |
• | QC1DB |
MEDIAN |
0.0719 |
ratio/FOV |
VAL | 0.02,0.12 |
20 |
ygradient |
this |
last_yr |
all
|
y-gradient over 1024 pixel, S13, H |
| 6 |
• | QC1DB |
MEDIAN |
0.0573 |
ratio/FOV |
VAL | 0.02,0.12 |
40 |
ygradient |
this |
last_yr |
all
|
y-gradient over 1024 pixel, S13, Ks |
| |
|
*Data sources: QC1DB: QC1 database; LOCAL: local data source
|
| Plot 1 | | data source: | naco_lampflat
(QC1 database) |
| dataset: | xgradient | • |
| median: | 0.0478 | ratio/FOV |
| fixed thresholds: | -0.02...0.08 | ratio/FOV |
| N_data plotted: | 18 |
| [click plot for closeup] |
| Plot 2 | | data source: | naco_lampflat
(QC1 database) |
| dataset: | xgradient | • |
| median: | 0.0267 | ratio/FOV |
| fixed thresholds: | -0.02...0.08 | ratio/FOV |
| N_data plotted: | 20 |
| [click plot for closeup] |
| Plot 3 | | data source: | naco_lampflat
(QC1 database) |
| dataset: | xgradient | • |
| median: | 0.0181 | ratio/FOV |
| fixed thresholds: | -0.02...0.08 | ratio/FOV |
| N_data plotted: | 40 |
| [click plot for closeup] |
| Plot 4 | | data source: | naco_lampflat
(QC1 database) |
| dataset: | ygradient | • |
| median: | 0.0874 | ratio/FOV |
| fixed thresholds: | 0.02...0.12 | ratio/FOV |
| N_data plotted: | 18 |
| [click plot for closeup] |
| Plot 5 | | data source: | naco_lampflat
(QC1 database) |
| dataset: | ygradient | • |
| median: | 0.0719 | ratio/FOV |
| fixed thresholds: | 0.02...0.12 | ratio/FOV |
| N_data plotted: | 20 |
| [click plot for closeup] |
| Plot 6 | | data source: | naco_lampflat
(QC1 database) |
| dataset: | ygradient | • |
| median: | 0.0573 | ratio/FOV |
| fixed thresholds: | 0.02...0.12 | ratio/FOV |
| N_data plotted: | 40 |
| [click plot for closeup] |
To measure the illumination gradient over the FOV, four pixel-windows have been defined on the master lamp flat product, each one 100x100 large,
and with a distance of about 100 pixel from the edge of the chip with centers at
- x=150,y=512 (left)
- x=850,y=512 (right)
- x=512,y=150 (bottom)
- x=512,y=850 (top)
Based on these four windows one flux gradient in x and one in y is calculated.
The flux gradients are normalized to the size of the FOV (Delta x = 1024 pixel).
E.g. xgradient = -0.2 means, that the counts are 20% less on the right rim than on the left rim of the detector.
In the read mode DET.NCORRS.NAME=FowlerNsamp, flats are contamined resulting
in a different y-gradient, with respect to lamp flats acquired with
DET.NCORRS.NAME=Double_RdRstRd.
The gradient monitors a symptom, not a cause.
General information
Click on any of the plots to see a close-up version.
The latest date is indicated on top of the plot.
If configured,
- data points belonging to the latest date are specially marked
- statistical averages are indicated by a solid line, and thresholds by broken lines
- outliers are marked by a red asterisk. They are defined as data points outside the
threshold lines
- "aliens" (= data points outside the plot Y limits) are marked by a red arrow (↑ or ↓)
- you can download the data for each parameter set if the 'Data downloads' link shows up
|
