| [ec392464] | 1 | .. slit_calculator_help.rst |
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| 2 | |
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| 3 | .. This is a port of the original SasView html help file to ReSTructured text |
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| 4 | .. by S King, ISIS, during SasView CodeCamp-III in Feb 2015. |
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| 5 | |
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| [8a22b5b] | 6 | |
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| [ec392464] | 7 | Slit Size Calculator Tool |
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| 8 | ========================= |
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| 9 | |
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| 10 | Description |
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| 11 | ----------- |
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| [8a22b5b] | 12 | |
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| [346745a] | 13 | This tool enables X-ray users to calculate the slit size (FWHM/2) for resolution |
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| 14 | smearing purposes based on their half beam profile data (as Q vs Intensity; any |
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| 15 | other data fields are ignored). |
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| 16 | |
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| 17 | Method |
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| 18 | ------ |
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| 19 | |
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| 20 | The tool works by sequentially summing 10 or more intensity values until a |
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| 21 | maximum value is attained. It then locates the Q values for the points just before, |
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| 22 | and just after, **half** of this maximum value and interpolates between them to get |
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| 23 | an accurate value for the Q value for the half maximum. |
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| [8a22b5b] | 24 | |
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| [170b251] | 25 | NOTE! Whilst it may have some more generic applicability, the calculator has |
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| [346745a] | 26 | only been tested with beam profile data from Anton-Paar SAXSess\ :sup:`TM`\ software. |
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| 27 | The beam profile file does not carry any information about the units of the |
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| 28 | Q data. It is probably |nm^-1| but the resolution calculations assume the slit |
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| 29 | height/width has units of |Ang^-1|. If the beam profile data is not in these |
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| 30 | units then it, or the result, must be manually converted. |
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| [ec392464] | 31 | |
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| 32 | .. ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ |
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| 33 | |
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| [a9dc4eb] | 34 | Using the tool |
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| 35 | -------------- |
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| [ec392464] | 36 | |
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| [8a22b5b] | 37 | 1) Select *Slit Size Calculator* from the *Tool* menu on the SasView toolbar. |
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| 38 | |
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| 39 | 2) Load a beam profile file in the *Data* field using the *Browse* button. |
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| 40 | |
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| [5ed76f8] | 41 | *NOTE! To see an example of the beam profile file format, visit the file |
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| [346745a] | 42 | beam profile.DAT in your {installation_directory}/SasView/test_1d folder.* |
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| [8a22b5b] | 43 | |
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| [5ed76f8] | 44 | 3) Once a data is loaded, the slit size is automatically computed and displayed |
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| [8a22b5b] | 45 | in the tool window. |
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| [ec392464] | 46 | |
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| [8a22b5b] | 47 | .. ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ |
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| [ec392464] | 48 | |
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| [346745a] | 49 | .. note:: This help document was last changed by Steve King, 09Sep2018 |
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