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USAXS Imaging Operations #26

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prjemian opened this issue Jul 20, 2018 · 2 comments
Closed

USAXS Imaging Operations #26

prjemian opened this issue Jul 20, 2018 · 2 comments
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@prjemian
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The fundamental idea of USAXS imaging data acquisition is remarkably
simple. Basically, this is what we do.

  1. We collect a USAXS pattern which gives us an idea about the
    scattering power of the sample.
  2. We decide a few q values where we want the images to be acquired.
  3. At each q, we decide the number of filters that is required and the
    image acquisition time, and acquire 4 images. Immediately after
    tuning of the instrument, we acquire
    1. USAXS image (sample in the beam, with filter, beam on).
    2. Optics (sample not in the beam, with filter, beam on).
    3. Dark field (beam off).
    4. Flat field image (sample not in the beam, q = 0, with filter,
      beam on, image acquisition time may need to be shortened to
      prevent saturation).
  4. For tomography, the only difference is that at a given q, we acquire
    the data at a range of rotational angles (0° to 181°) with angular
    step between 0.5° and 2°. We do not have to acquire Optics, Dark
    field, and Flat field images (3.b, 3.c, and 3.d) for every USAXS
    image. Instead, one set per preUSAXStune is considered adequate.
    (For large q, the image acquisition time is long. Hence, we need to
    separate the tomographic data series into a few segments with
    preUSAXStune in-between).
@prjemian prjemian added the task label Jul 20, 2018
@prjemian prjemian added this to the 2018-2 USAXS Imaging milestone Jul 20, 2018
@prjemian prjemian self-assigned this Jul 20, 2018
@prjemian prjemian changed the title 2018-02 USAXS Imaging USAXS Imaging Operations Aug 2, 2018
@prjemian prjemian removed this from the summer beam time testing milestone Aug 2, 2018
@prjemian prjemian added this to the 2019-06 beam time milestone Apr 18, 2019
This was referenced May 31, 2019
@prjemian
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See these issues:

Step 1.

  • done

Step 2.

  • manual

Step 3.

Step 4.

@prjemian
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Now that specific issues are created for each step (remaining to be implemented), closing here.

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