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| QC PLOTS |
| STREHL: |
CURRENT |
HISTORY |
| fibre |
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| QC1 database (advanced users):
browse
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plot |
Click on CURRENT to see the current trending (Health Check).
Click on HISTORY to see the historical evolution of the trending. |
The central maximum, in units of total flux of a PSF source, is a measure of the image quality and the adaptive optics (AO) performance. A least once per day an illuminated internal fibre is imaged with the adaptive optics active (K-band grating at the 25 mas pixel scale). The sinfo_rec_jitter recipe subtracts a DARK and performs a cube reconstruction. The strehl ratio is calculated on this single internal fibre image as a function of wavelength (NB. Being an internal source the fibre image is not subject to any atmospheric turbulence).
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The SINFONI adaptive optic health check fibre.
Left panel: The stacked PSF fibre calibration.
Right panel: The cube-reconstructed fibre image. |
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WAVE parameters trended |
QC1 plots
The QC1 plots for the SINFONI strehl ratios show the:
- strehl ratio of the fibre and its standard deviation
- strehl ratio of the PSF star and its standard deviation (coming soon)
- strehl ratio of the STD star and its standard deviation (coming soon)
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The trending plots of the median strehl ratio of the fibre light source and its standard deviation. The AO fibre health check is only obtained with the K-band grism at the 25 mas pixel scale.
Note: The standard deviation is in units of 10-4. The apparent discontinuity near 2008-02-15 is due to a change in the algorithm computing the standard deviation.
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QC1 parameters trended
| Page |
Parameter |
Table: Name (QC1 database) |
Description of Procedure |
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strehl ratio: fibre |
N/A |
SINFONI pipeline: Based on a single observation of the internal illuminated fibre, the sinfo_rec_jitter recipe subtracts a DARK frame and performs a cube reconstruction. The strehl ratio is determined using:
where Imaxobj is the maximum intensity measured in the sky-subtracted object and Fobj is its corresponding total flux. ImaxPSF and FPSF are, respectively, the theoretical maximum intensity and total flux attainable given the telescope M1 and M2 diameters, the central wavelength and wavelength range, at a given pixel scale. |
Trending and Issues
The strehl ratios computed by the SINFONI pipeline for the standard and PSF stars is not yet stable, but will soon be added to the trending plots.
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