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

    Joined:
    Oct 11, 2014
    Messages:
    42
    Doug,
    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

    Joined:
    Oct 27, 2014
    Messages:
    2,433
    Dick, one of my colleagues will get back to you. We're reviewing.
    Best wishes,
    Colin
     
  3. Tim

    Tim Staff Member

    Joined:
    Sep 25, 2014
    Messages:
    1,622
    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.
     
  4. Richard S Post

    Richard S Post Cyanogen Customer

    Joined:
    Oct 11, 2014
    Messages:
    42
    I recieved a note that my camera is repaired, but it has not arrived. Could I get the tracking number?

    Can you explain the source of the problem and its solution?

    Thanks, Dick
     
  5. Doug

    Doug Staff Member

    Joined:
    Sep 25, 2014
    Messages:
    6,170
    It looks like some of the thermal pad material migrated. Not sure why that happened but we have changed to a different material so it shouldn’t happen again.

    I’ll check with our shipping department.
     

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