User Tools
dac_experiments:geometry
Differences
This shows you the differences between two versions of the page.
| Both sides previous revision Previous revision Next revision | Previous revision | ||
|
dac_experiments:geometry [2019/05/08 15:28] matthias |
dac_experiments:geometry [2019/06/07 15:01] (current) matthias [Example: How to find out my own O-matrix] |
||
|---|---|---|---|
| Line 19: | Line 19: | ||
| Here is an example, taken from an old Fable manual (Note: one of the example is wrong, I did see that some times ago, seb) | Here is an example, taken from an old Fable manual (Note: one of the example is wrong, I did see that some times ago, seb) | ||
| - | {{ :processing:fableimageorientexample.jpg?nolink&400 |}} | + | {{ :processing:fableimageorientexample.jpg?nolink&400 |Fig. 2: Example for the 8 possible orientations of a 2D image}} |
| Fig. 2: Example for the 8 possible orientations of a 2D image. | Fig. 2: Example for the 8 possible orientations of a 2D image. | ||
| Line 33: | Line 33: | ||
| Let's do it for the image at ω1 = -20° | Let's do it for the image at ω1 = -20° | ||
| - | {{ :dac_experiments:orientations.png?600 |}} | + | {{ :dac_experiments:orientations.png?600 |Fig. 3: Example for different orientations of the same image}} |
| Fig. 3: Example for different orientations of the same image. | Fig. 3: Example for different orientations of the same image. | ||
| Line 41: | Line 41: | ||
| Ask the beamline scientist if the images are saved in a different orientation than the actual setup geometry. | Ask the beamline scientist if the images are saved in a different orientation than the actual setup geometry. | ||
| - | If this is not the case and the diffraction image on the screen is the same as the one you would see when we had a photofilm, everything is fine. But if it is the case, it makes it more complicated. You have to keep it in mind for the following steps. | + | If this is not the case and the diffraction image on the screen is the same as the one you would see when you had a photofilm, everything is fine. But if it is the case, it makes it more complicated. You have to keep it in mind for the following steps. |
| === Step 2 === | === Step 2 === | ||
| Line 47: | Line 47: | ||
| Have a look at the sample stage. In which orientation is the rotation taking place? Where is the rotation axis pointing? | Have a look at the sample stage. In which orientation is the rotation taking place? Where is the rotation axis pointing? | ||
| - | I guess in most setups the rotation axis of ω is pointing to the top or to the bottom (see figure 1). Other directions just make no sense. From this you can conclude that the shadow in our diffraction image has to be either on the right or on the left side of the image. With this information you can already exclude 4 out of the 8 possible orientations. | + | I guess in most setups the rotation axis of ω is pointing to the top or to the bottom (like the Z-direction in figure 1). From this you can conclude that the shadow in our diffraction image has to be either on the right or on the left side of the image. With this information you can already exclude 4 out of the 8 possible orientations. |
| === Step 3 === | === Step 3 === | ||
| Line 63: | Line 63: | ||
| === Conclusion === | === Conclusion === | ||
| - | If you have followed the example in the right way, you should have come up with the solution that Orientation #8 is the correct one (corresponds to O-matrix [0,-1,-1,0]. | + | If you have followed the example in the right way, you should have come up with the solution that Orientation #8 is the correct one (corresponds to O-matrix [0,-1,-1,0]). |
dac_experiments/geometry.1557329300.txt.gz · Last modified: 2019/05/08 15:28 by matthias
Page Tools
Except where otherwise noted, content on this wiki is licensed under the following license: GNU Free Documentation License 1.3
