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  1. Data Management
  2. DM-38800

bias stability study

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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

          czw Christopher Waters created issue -
          czw Christopher Waters made changes -
          Field Original Value New Value
          Attachment image (11).png [ 67598 ]
          Attachment image (10).png [ 67599 ]
          Attachment image (9).png [ 67600 ]
          Attachment image (8).png [ 67601 ]
          Attachment BiasEvolution.mov [ 67602 ]
          czw Christopher Waters made changes -
          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
          czw Christopher Waters made changes -
          Attachment biasNoise-20230421-tile.png [ 67626 ]
          czw Christopher Waters made changes -
          Attachment biasNoise-20230421-cpVerifyBias.ipynb [ 67627 ]
          Attachment biasNoise-20230421-SEQ.png [ 67628 ]
          Attachment biasNoise-20230421.png [ 67629 ]
          czw Christopher Waters made changes -
          Status To Do [ 10001 ] In Progress [ 3 ]
          czw Christopher Waters made changes -
          Resolution Done [ 10000 ]
          Status In Progress [ 3 ] Done [ 10002 ]
          czw Christopher Waters made changes -
          Story Points 2

          People

            czw Christopher Waters
            czw Christopher Waters
            Christopher Waters, Kian-Tat Lim
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            Dates

              Created:
              Updated:
              Resolved:

              Jenkins

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