Day 1: 12/06/22:
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- Plan for the day:
- Take the time stamps of all the files, reorganize the files in a way that we only use good files.
- Make it very clear in jupyter notebook what I did.
- Back all the data up into the cluster
- Run the analysis.
- If additional time, work to make DIMSUM sturdier.
- Writing the following the next day (12/15/22)
- Ran the analysis and the graphs are available in the jupyter notebook.
- Overall, the data does not seem to useful, as the sources get worse, the differential motion measured increased. I did several cuts to data with respect times of source quality. As the time passes (and source quality decreased) the differential image motion was simply more. I do not know if it can be trusted. I still have all the datas in the csvs.
- At the end of second run we have a lot of dark files, when I checked the hardware out today it seemed fine.
- We attempted to make both the camera and the pegboard more sturdy.
- Mounted the camera directly on top of the L rail. It is harder to adjust but more sturdy. Such a mount made the camera higher than before and unable to tilt. To address that we moved the pegboard up. Today we will see whether the higher pegboard will be blocked by the telescope. Telescope was not able to rotate last night.
- We debugged the focusing and ghosting issue with continuous light sources. Even in the most focused case, the sources seem to have ghosting affects. The ghosting did not get fixed when we relieved pressure from the optical fiber, changed the location of the source in the pegboard, or how far we put through the fiber to the thing it's holding, or whether we are using sm1 holders or what Elana had used in her previous setup. Here are examples of ghosting we see:
- I ran some analysis with the more sturdy setup. It looks decent. I also did two more tests when the fan downstairs was open. Unfortunately in one of the tests the window was not open so the fan did not ork probably. I was also only allowed to work it up to 20Hz.
- Overall, the view from the camera, the camera itself, and the pegboard itself look like this:
- Backed up both of the observing runs to the cluster. Going to back up the additional tests as well.
From Stubbs:
Ok sounds like a partial success. I think the key think is to get a good dome-closed vs. dome-open comparison.
I don't understand the longer exposures. Is that with a single flash per image? If so then all the longer images would seem to do is add to the background and not the signal. Or are you running with constant light source?
I can certainly believe that dome rotation shakes things- During most image the dome is not rotating.
The focus change could well be due to temperature change of the lens. I can't remember if there is an f-stop ring on that lens or not... I think not. The depth of focus will increase if you make a smaller aperture in front of the lens. There is heavy duty Aluminum foil in the cardboard fan box at the base of the pier. You could try making a snout with a 1 inch off-axis hole and see if that (with reducing ND filter) helps with focus.
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