Changes between Version 2 and Version 3 of DemoIntegrateTilted


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Timestamp:
Jul 27, 2011 11:34:19 PM (10 years ago)
Author:
toby
Comment:

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  • DemoIntegrateTilted

    v2 v3  
    11= Calibration of an area detector in GSAS-II =
    22
    3 ''In this demo, data collected with a GE(?) area detector, intentionally tilted at 45 degrees, are used''
     3''In this demo, data collected with a GE(?) area detector, intentionally tilted at 45 degrees, are used. Note that menu entries are listed as Help/About GSAS-II, which refers to the name of the menu (here "Help") and the name of the entry in the menu (here "About GSAS-II").''
    44
    55Step 1: download the data file from one of these links
     
    2020Max threads  1
    2121}}}
    22 You should see two windows, both empty. One is labeled GSASII Plots, the other GSAS-II data tree. On Linux and Windows a menu bar appears on the latter window; on a Mac the menu is in the system location (usually at the screen top).
     22You should see two windows, both empty. One is labeled GSASII Plots, the other GSAS-II data tree. On Linux and Windows a menu bar appears on the latter window; on a Mac the menu is in the system menu bar location (usually at the screen top).
    2323
    2424Step 3: read in the data file.
    2525
    26  Use the Data/Read image data menu item [[Image(d1m1.png, align=top)]]. Select the La_hex_+45deg-00015.tif data file and press Open.
     26 Use the Data/Read image data menu item
     27 ([https://subversion.xor.aps.anl.gov/trac/pyGSAS/attachment/wiki/DemoIntegrateTilted/d1m1.png view]).
     28 Select the La_hex_+45deg-00015.tif data file and press Open.
    2729
    2830 At this point the data tree window will have several entries
     31 ([https://subversion.xor.aps.anl.gov/trac/pyGSAS/attachment/wiki/DemoIntegrateTilted/d1w1.png view]); the plot window
     32 shows a faint image
     33 ([https://subversion.xor.aps.anl.gov/trac/pyGSAS/attachment/wiki/DemoIntegrateTilted/d1w2.png view]) and a new window
     34 is opened to edit the image controls
     35 ([https://subversion.xor.aps.anl.gov/trac/pyGSAS/attachment/wiki/DemoIntegrateTilted/d1w3.png view]). 
     36
     37Step 4: Edit image parameters
     38
     39 Note that, alas, very few image formats allow for storage of important metadata about the image, so this information needs to be added manually. In this case set the '''wavelength to 0.10798'''. It is also helpful to change the display of the image so that it is easier to see the diffraction rings. Lowering the maximum intensity to 10,000 to 20,000 counts will help (note that this can be done by moving the slider, or by typing a value in the box and then clicking on another control). You may also wish to select another color scheme using the color bar selector.
     40
     41 Alternately, the view of the image can be enhanced by displaying it on a logarithmic scale. Click on the window and press the upper or lowercase "L" key to toggle logarithmic plotting, or use the keypress selector button at the lower left of this window.
     42
     43Step 5: Calibrate
     44
     45  First: set the material used as a sample in the box labeled Calibrant
     46
     47  Second: Use the Image Operations/Calibrate menu item (note this menu is on the Image Controls window or for the Mac, the Image Controls window must be active to place this into the system menu bar).