[Nexus] some questions about NXdetector_module

[Benjamin Watts]

Hi Eugen,
    I don't use it myself, but I think issue 2 refers to the readout of 
the detector. The pixels have to be put into some order to be streamed 
out of the detector and the fast direction would be the lines of pixels 
that are kept adjacent in the stream. I don't know if this is still 
needed for non-ancient setups.

Cheers,
Ben

On 01/07/15 11:07, Eugen Wintersberger wrote:
> Hi folks
>    I am currently trying to improve the documentation of the `NXdetector`
> class. What I am actually trying to do is to compute the spatial
> location of a pixel in the laboratory frame for different experiment
> configurations. My requirement is that `NXdetector` and
> `NXdetector_module` should provide information to do this job. However,
> there are some issues we may should think about.
>
> issue 1.)
> If all transformations involved (in particular `module_offset`) are
> required to be translations, we can never deal with curved detectors
> which might be very useful. I guess it thus would make sense to replace
> `module_offset` my an instance of `NXtransformation`. The best solution
> might be to make module_offset an instance of `NXtransformation` rather
> than a field?
>
> issue 2.)
> What exactly is the content of the `fast_pixel_direction` and
> `slow_pixel_direction` field? Are this, for instance, the pixel center
> positions along a detector axis?
> As an example consider a 1D strip detector with 50um pixel size. Is
> fast_pixel_direction = [0,50,100,150,....] with units = um?
>
> issue 3.)
> If we want to handle 3D detector as well we maybe should ad a
> `medium_pixel_direction` field ;)
>
> If anyone is interested in what I am doing try the issue_412 branch in
> the git repository of the Nexus definitions. You find the new text in
> the Nexus Design section in the manual.
>
> regards
> Eugen
>
>
>
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