Uploaded image for project: 'Data Management'
  1. Data Management
  2. DM-38800

bias stability study

    XMLWordPrintable

Details

    • Story
    • Status: Done
    • Resolution: Done
    • None
    • None
    • None
    • 2
    • Data Release Production
    • No

    Description

      Movie of bias evolution spanning 20210908 to 20230316

      [BiasEvolution.mov]

      this is row 500 of the bias frames (offsets of 50 ADU introduced for clarity)

      [image (8).png]

      zoom in near column 1000: tens of ADUs of variation at amp boundaries:

      [image (9).png]

      row 2500:

      [image (10).png]

      (variable SNR is due to differing number of frames stacked to make the bias images)
      many 10's of ADUs of variation in sloping bias structure.
      looking at a single extracted column and plotting bias level vs. row number for column 2500 we see amp-boundary variation in some but not in others

      [image (11).png]

      I claim this validates the assertion that we should construct biases daily. That’s the fastest cadence at which we can do so, currently. And there is no SNR penalty as long as we stack up 11 or so.
      legend order : top legend is plotted line on the bottom

      Attachments

        1. BiasEvolution.mov
          24.94 MB
        2. biasNoise-20230421.png
          biasNoise-20230421.png
          114 kB
        3. biasNoise-20230421-cpVerifyBias.ipynb
          2.09 MB
        4. biasNoise-20230421-SEQ.png
          biasNoise-20230421-SEQ.png
          188 kB
        5. biasNoise-20230421-tile.png
          biasNoise-20230421-tile.png
          1.03 MB
        6. image (10).png
          image (10).png
          416 kB
        7. image (11).png
          image (11).png
          398 kB
        8. image (8).png
          image (8).png
          1.74 MB
        9. image (9).png
          image (9).png
          601 kB

        Activity

          People

            czw Christopher Waters
            czw Christopher Waters
            Christopher Waters, Kian-Tat Lim
            Votes:
            0 Vote for this issue
            Watchers:
            2 Start watching this issue

            Dates

              Created:
              Updated:
              Resolved:

              Jenkins

                No builds found.