[Nexus] nexus units

[Tim Gruene]

Dear Paul,

I am not sure you appreciate comments or if your email is meant purely
informatively.

Some of the units listed below are clearly not 'rates' - or could you
explain how 'detectors' or 'Angstroem' etc. are units for rates?

Wouldn't it be better to reject files containing such units and asking
the maintainer to use the format properly?

I've seen nexus files which were completely useless because the fields
were improperly used. Don't people think that accepting those units
which are none will contribute to spoiling the idea behind hdf/nexus?

Best regards,
Tim

On 05/26/2015 03:28 PM, Paul Kienzle wrote:
> Hi,
> 
> When trying to decide what units to use for monitor rate, I wanted to know what 
> was already in use in the NeXus world.
> 
> I wrote a little script (see attached) to walk the github 
> nexusformat/exampledata repo and list all the units used in the files.
> 
> The results are shown below.
> 
> Many thanks to those facililities that have supplied data files (Soleil, APS, 
> IPNS, ANSTO and SINQ).  I’ll include some NCNR files once we have settled on the 
> format.
> 
> I updated units.py to accept all these units.  This should be able to replace 
> the version in bindings/python/nxs.
> 
>   - Paul
> 
> Paul Kienzle
> paul.kienzle at nist.gov
> 
> 
> Note: facility “code” refers to SINQ.
> ============================================================
> unit               facility
> ============================================================
>                     : Soleil
> A                   : APS, Soleil
> Angstroem           : code
> Hz                  : IPNS, Soleil
> K                   : ANSTO, code
> MW                  : ANSTO
> RPM                 : code
> User Unit           : Soleil
> V                   : Soleil
> bars                : IPNS
> count               : ANSTO
> count/sec           : ANSTO
> counts              : code, IPNS
> countsOrseconds     : code
> degree              : code
> degrees             : ANSTO, APS, IPNS
> detectors           : code
> h                   : Soleil
> keV                 : APS, Soleil
> ls-1                : ANSTO
> m                   : APS, code, IPNS
> mA                  : Soleil
> mRad                : Soleil
> meV                 : code, IPNS
> microseconds        : ANSTO, IPNS
> mm                  : ANSTO, code, Soleil
> ms                  : Soleil
> nm                  : code
> rpm                 : ANSTO, code
> secORcounts         : code
> seconds             : ANSTO, code
> us                  : code
> °C                  : Soleil
> Å                   : Soleil
> ============================================================
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> NeXus at nexusformat.org
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> 

-- 
--
Dr Tim Gruene
Institut fuer anorganische Chemie
Tammannstr. 4
D-37077 Goettingen
phone: +49 (0)551 39 22149

GPG Key ID = A46BEE1A


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