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NACO Quality Control:
CHECK AO CORRECTION frames

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NACO QC
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QC links:
strehl_daily | xpos_daily | ypos_daily
 
QC PLOTS
  CURRENT HISTORY
strehl_daily
xpos_daily
ypos_daily
QC1 database (advanced users): browse | plot
   Click on CURRENT to see the current trending (Health Check).
   Click on HISTORY to see the historical evolution of the trending.


The daily AO (adaptive optics) check is a pipeline supported technical calibration. About once a day the CheckAOCorrection template is executed for 5 different AO configurations:

  • dichroic - VIS, WFS type - VIS, WFS mode - 1-3, camera S27
  • dichroic - VIS, WFS type - VIS, WFS mode - 5-1, camera S27
  • dichroic - N20C80, WFS type - IR, WFS mode - 3-2, camera S27
  • dichroic - N20C80, WFS type - IR, WFS mode - 6-1, camera S27
  • dichroic - N20C80, WFS type - IR, WFS mode - 9-1, camera S27

The set of frames contain a dark exposure and a exposure, that shows an image of the internal PSF fiber source. According to the NACO operations manual the shape of the PSF fiber image can be either

  • diffuse, meaning at least one of the optical components of the AO system is not aligned,
  • a circular image, meaning the optical path is well aligned, but AO loop is not closed
  • a nearly diffraction limited Airy pattern, meaning the AO loop is closed. In this latter case the pipeline retrieves the Strehl ratio as a the key performance of the NACO adaptive optics system. In this situation, the AO system has to corrected well a more static wave front distortion induced by the reflections inside the optical system. While in the case of observing stars through the earth atmosphere (see here), the NACO AO system has to correct a dynamically modulated wave front with a high frequency (~30Hz).

 

 

checkao_WF CHECK AO frame This is an example of the master calibration CHECK AO frame. It is a pipeline product of the "naco_img_strehl" recipe. The point like source is an image of the instrument internal NIR PSF fiber.
checkao4 Zoomed, the AO loop is closed and diffraction rings are resolved.
checkao5 Example: the AO loop is not well closed
checkao7 Example: the AO loop is not closed
checkao6 Example: the AO loop is not closed
checkao1 Example of a badly aligned calibration fiber optics

 

QC1 parameters

parameter QC1 database: table, name procedure
"strehl" naco_checkao strehl ratio of the fiber light image
"strehl_posx" naco_checkao x-position of the fiber light image
"strehl_posy" naco_checkao y-position of the fiber light image
"strehl_flux" naco_checkao mean flux in counts
"strehl_peak" naco_checkao mean peak intensity in counts
"strehl_error" naco_checkao error of determined strehl ratio
"strehl_rms" naco_checkao RMS of determined strehl ratio


top strehl_daily

The following plot shows the temporal evolution of the strehl ratio determined for the fiber light image. All 5 instrumental setups are represented.
top xpos_daily

The trending plot shows the X position of the image of the fiber light as a function of time. Again 5 instrumental setups are represented

top ypos_daily

This trending plot shows the temporal evolution of the Y position of the image of the fiber light determined by the pipeline.



 
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