Experimental Physics and
Industrial Control System

Take a look at this Jupyter notebook: https://github.com/BCDA-APS/bluesky_training/blob/4da2789cbbeaefa0ac95d0c449bba042a35cf831/.wip/images_darks_flats.ipynb

While it is marked as *work-in-progress*, it might point you in a forward direction.

HTH,
   Pete


On 12/8/2021 10:54 AM, Sintschuk, Michael via Tech-talk wrote:

Hello EPICS-community,

as the title of this thread says, I’m wondering if it is possible to dynamically select where an incoming frame is placed within the HDF5-Files structure. For example, while capturing frames in Stream-mode with the default HDF5-Files structure layout, all incoming frames are placed to:

entry -> instrument -> detector -> data

Now I want to load an individual hdf5-layout.xml with the additional location “flat”:

entry -> instrument -> detector -> flat

Is there a way that I can switch (via an EPICS-PV) the location where the next frame is stored, either “entry -> instrument -> detector -> data” or “entry -> instrument -> detector -> flat”, while the h5-files is still opened? Example scan with a total of 1000 frames, all should go into one h5-file:

  * h5-files is opened
  * the first 20 frames are placed to entry -> instrument -> detector -> flat
  * the next 960 frames are placed to entry -> instrument -> detector -> data
  * the last 20 frames are placed to entry -> instrument -> detector -> flat
  * h5-files is closed

In the AreaDetector user-guide there is the following section:

https://areadetector.github.io/master/ADCore/NDFileHDF5.html#selective-positional-placement-of-individual-frames <https://areadetector.github.io/master/ADCore/NDFileHDF5.html#selective-positional-placement-of-individual-frames>

I switched on the Position mode and put Index N to 0 (or 1) and put Name N to “flat” but I get a Write error status. I think I don’t understand the handling of the dataset dimensions within the h5-file and don’t know if my frame-placement sequence is actually realizable. Can someone help?

Thanks!

Michael

Michael Sintschuk
*Bundesanstalt für Materialforschung und –prüfung (BAM)*
8.5 Mikro-ZfP

Unter den Eichen 87
12205 Berlin
GERMANY

P: +49 30 8062-15063 (BESSY, Adlershof)

P: +49 30 8104-4065 (BAM, Steglitz)
michael.sintschuk at bam.de <mailto:michael.sintschuk at bam.de>

michael.sintschuk at helmholtz-berlin.de <mailto:michael.sintschuk at helmholtz-berlin.de>

--
----------------------------------------------------------
Pete R. Jemian, Ph.D.                 <jemian at anl.gov>
Beam line Controls and Data Acquisition (BC, aka BCDA)
Advanced Photon Source,    Argonne National Laboratory
Argonne, IL  60439                    630 - 252 - 3189
-----------------------------------------------------------
      Education is the one thing for which people
         are willing to pay yet not receive.
-----------------------------------------------------------

References:

AreaDetector NDFileHDF5 dynamic frame-placement within an opened H5-file Sintschuk, Michael via Tech-talk

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