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Several calibration templates are in use to acquire and monitor the point spread
function (PSF) of the instrument (SPIFFI) and the performance of the adaptive
optics module (AO).
- Daily AO Health Check : once or several times a day the
template generates a frame of the internal fiber using setting K 0.025 and
AO=ON, and a dark frame for subtraction. The sinfo_rec_jitter recipe subtracts the
DARK and performs a cube reconstruction. The Strehl ratio is calculated on
this single internal fiber (is n ot subject of any atmospheric turbulence)
as a function of wavelength.
- NGS,LGS template : On request by the user, one or more OBJECT
frames and optional SKY frames are taken of a user-defined PSF-calibration
star. The setting is free. The sinfo_rec_jitter recipe coadds the SKY subtracted
OBJECT frames and calculates the Strehl ratio as a function of wavelength on
the coadded cube of the star.
- StrehlMon template : (experimental in P77) takes an OBJECT
and SKY framw with setting 25K followed by an OBJECT and SKY frame with setting
100K. The sinfo_rec_jitter recipe cube-reconstructs both settings separately. For
calculating the Strehl ratio, the peak intensity is taken from the 25K setting,
while the flux is taken from the 100K setting, giving a better flux estimation
and hence a more accurate Strehl ratio.
- PRODUCT
QC PLOT. For each sinfo_rec_jitter pipeline product and its associated raw frames
we create a plot with the most significant features.
- DIFFERENCE FRAMES. Does not apply
- RELATIONS Does not apply
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TRENDING This means that selected QC1 parameters are monitored as a function
time. The purpose is to find long term variations which cannot detected on a single
product frame.
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| PRODUCT
PLOTS | |
Point Spread Function calibrations are either day-time calibration using the
internal fiber or night time calibrations using a star (a virtual point source).
The day-time fiber calibrations are to test the AO as a daily health check. High
Strehl ratios are gained, since the AO has not to fight against any atmospheric
turbulence. The night time calibrations are taken if requested bu the observaing
run.
Figure caption
Upper Plot
a) (red) the spectrum, as extracted by the pipeline. The sky/dark is
already subtracted.
b) (blue) the spectrum as extracted by the post-pipeline script. It contains
the star/fiber and the sky/dark.
c) (black) the integral of the 2D Gaussian fit., always overestimated since
PSF is not Gaussian. |
Second Plot Left
The X and Y position of the peak of the 2D Gaussion fit as a function of
wavelength |
Second Plot Right
Fractional
encircled energy
as a function of increasing aperture. |
Third Plot
Position angle of the semimajor axis of the 2D Gaussian fit as a function
of wavelength |
Third Plot Right
Strehl ratio as a function of wavelength |
Lower Plot
Major and Minor FWHM of the 2D Gaussian fit, and the ratio 10 * FWHM(Maj)/FWHM(Min)
as a simple for the cube reconstruction (assuming the PSF as delivered by
the telescope is circular). |
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| ![[top]](../img/arr1red-up.gif) | DIFFERENCE
FRAMES | | Not
applicable | ![[top]](../img/arr1red-up.gif) |
RELATIONS | | Not
applicable | ![[top]](../img/arr1red-up.gif) | CONTROL
CHARTS | |
Not applicable |
![[top]](../img/arr1red-up.gif) |
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- Strehl ratio from daily AO health check uisng internal
fiber DAILY_FIBER
AO_
- Strehl ratio from user-defined PSF calibration star (NGS
or PSF template) NGS,/LGS-STAR
- Strehl ratio from StrehlMonitor template (two cameras) STREHL_MONITOR
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