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*Date on this monitor changes at 21:00 UT | |||||||||||||||||||||||||||||||||||||||||||||
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| Plot [info] |
Symbol [info] |
Source* | Average [info] | Thresholds [info] | N_data | Data downloads | Remarks | ||||
| method | value | unit | method | value | |||||||
| 1 | • | QC1DB | MEDIAN | 4044.30591 | nm | none | 79 | this | last_yr | all | center wavelength on chip 1, WREF=4092.9 | ||
| 2 | • | QC1DB | MEDIAN | 4069.25122 | nm | none | 79 | this | last_yr | all | center wavelength on chip 2, WREF=4092.9 | ||
| 3 | • | QC1DB | MEDIAN | 4092.90601 | nm | none | 79 | this | last_yr | all | center wavelength on chip 3, WREF=4092.9 | ||
| 4 | • | QC1DB | MEDIAN | 4115.36914 | nm | none | 79 | this | last_yr | all | center wavelength on chip 4, WREF=4092.9 | ||
| *Data sources: QC1DB: QC1 database; LOCAL: local text file | |||||||||||
Wavelength calibration: trending of central wavelength.
The central wavelength is monitored for the two daily health check settings with reference wavelengths (on chip 3) of 1090.4nm using ThAr lamp and 4092.9nm using N2O absorption cell. This plot shows the results with N2O.
The center wavelength should be stable on each chip. A shift of 0.01 nm corresponds to a shift of 0.56 pixels. The variation of the central wavelength should be less than about 5 pixels.
Pipeline processing in Garching applies dark subtraction, flat fielding, and
slightly different recipe parameters compared to the Paranal online pipeline.
Wavelength solutions from processing on Paranal are currently (as of Feb 2010) incorrect
and are omitted from plotting.
Click on any of the plots to see a close-up version.
The latest date is indicated on top of the plot, data points belonging to that date are specially marked. If configured,
General information