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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) # Correcting a Real Drift (requires x-rays)
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.
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. 2. Select a pair of photon energies that will give a significant difference in focal length (i.e. movement of the ZP-Z stage).
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.
Measure the position of the object at each energy and note the change in position. 4. Rotate the endstation using the Girder Mover.
Rotate the endstation using the Girder Mover. 5. Optimise the X-Y position of the Girder Mover for maximum X-ray signal.
Optimise the X-Y position of the Girder Mover for maximum X-ray signal. 6. Iterate steps 3-5 until the drift is minimised.
Iterate steps 3-5 until the drift is minimised.
# Applying a Feedback Drift Correction # Applying a Feedback Drift Correction