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Update Energy-Drift-Correction

watts
2026-03-16 13:30:37 +01:00
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Energy-Drift-Correction.-.md
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@@ -41,14 +41,12 @@ Note that adjusting the interferometer mirrors to optimise the signal intensity
# Correcting a Real Drift (requires x-rays)
Find an easily locatable feature that is also small and doesn't change in appearance very much when changing photon energy. A metal particle close to the corner of a membrane is ideal. Symmetry is often important.
Select a pair of photon energies that will give a significant difference in focal length (i.e. movement of the ZP-Z stage).
Measure the position of the object at each energy and note the change in position.
Rotate the endstation using the Girder Mover.
Optimise the X-Y position of the Girder Mover for maximum X-ray signal.
Iterate steps 3-5 until the drift is minimised.
1. Find an easily locatable feature on a sample that is also small and doesn't change in appearance very much when changing photon energy. A metal particle close to the corner of a membrane is ideal. Symmetry is often important since changes in focus and transparency can change the apparent center position of the object.
2. Select a pair of photon energies that will give a significant difference in focal length (i.e. movement of the ZP-Z stage).
3. Measure the position of the object at each energy and note the change in position.
4. Rotate the endstation using the Girder Mover.
5. Optimise the X-Y position of the Girder Mover for maximum X-ray signal.
6. Iterate steps 3-5 until the drift is minimised.
# Applying a Feedback Drift Correction