Staff Assigned: Tim sudden contamination on E2V chip during run

Discussion in 'Aluma Series' started by Richard S Post, Jul 6, 2019.

  1. Richard S Post

    Richard S Post Cyanogen Customer

    Oct 11, 2014
    I run a remote observatory and the Aluma 47-10 was getting nice images at 3:15 am, 6/24, when MDL crashed as seen in a previously posting. At 4 am, I restart MDL and ACP to continue the run. On the first image, I noticed what looks like condensation. 2 min later on the next image, the artifacts were larger, so I stopped the run and warmed the detector. The next day, I took a room temperature image using the observatory light on illuminating the wall. The image shows what looks like large particles and stains on the detector. After 2 weeks, I took room and -20C images with large particles showing, but no condensation.

    I have attached 5 images with the following time sequence: a good image before MDL crashed, image showing condensation like spots upon restart and the subsequent image, the image taken the following day and an image taken today.

    I will be at the obseratory for a week, next week. I can do further tests if you wish. The camera can't be used until it can be fixed.

    Regards, Dick

    Attached Files:

  2. Colin Haig

    Colin Haig Staff Member

    Oct 27, 2014
    Dick, one of my colleagues will get back to you. We're reviewing.
    Best wishes,
  3. Tim

    Tim Staff Member

    Sep 25, 2014
    I have not seen that type of artifact before on these sensors. Please send it back at your convenience and we will investigate further.

    I will send you the return instructions via PM shortly.

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