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SINFONI Quality control:
point spread function

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SINFONI QC PSF : GENERAL

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
  • 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.
[top] 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).
 


[top]DIFFERENCE FRAMES
 

Not applicable

[top] RELATIONS
 Not applicable
[top]CONTROL CHARTS
 

Not applicable

  [top]
TRENDING

 

 

  • 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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