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<== Date ==> | <== Thread ==> |
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Subject: | Re: [EXTERNAL] Question about image widget in Phoebus |
From: | Florian Feldbauer via Tech-talk <tech-talk at aps.anl.gov> |
To: | "Kasemir, Kay" <kasemirk at ornl.gov>, Mark Rivers <rivers at cars.uchicago.edu> |
Cc: | "tech-talk at aps.anl.gov" <tech-talk at aps.anl.gov> |
Date: | Thu, 29 Apr 2021 17:52:52 +0200 |
Hey Kay,
yes I know, but the display didn't work for me, so I thought
maybe I need the cursor PVs.
That's why I asked for their meaning in my first mail.
But looking at the example I found my mistake, why my waveform was
not displayed correctly.
Cheers,
Florian
> from our pixel sensor we just get a list of pixels that have seen a hit (row and column address).
That's exactly what the SNS beamline detectors report.They send messages which basically contain a time stamp, some detail about the beam pulse, and then a list of detector pixels which where hit and when exactly relative to the time stamp.
> We want to accumulate all hits and display them as 2d histogram (x-axis beeing column, y axis row and content of pixel = number of hits since start of the measurement).
Yes, we also need to to several things with that raw data.
It's streamed into files for later analysis, that's the basic data acquisition job.
It's put into X/Y histograms so you can display in near real time where the detector is hit, verify basic diffraction patterns.
It's put into time-of-flight histograms, into histograms that accumulate the energy or 'D-space' or ... of the hits.
But all that is done in IOCs, which then update an X/Y histogram image in basic area detector format, or waveforms for most of the rest. The display tool simply displays the image or waveform, it doesn't do any of the computations.
-Kay
-- Ruhr-Universität Bochum AG der Experimentalphysik I Dr. Florian Feldbauer NB 2/131 / Fach 125 Universitätsstr. 150 D-44801 Bochum Office: NB 2/134 Phone: (+49)234 / 32-23563 Fax: (+49)234 / 32-14170 https://paluma.ruhr-uni-bochum.de