
Fluid Imaging
Operating Principles
164 Dimension 3100 Manual Rev. D
6. Adjust laser alignment in photodetector
Fluid changes the optical path length as the angle of refraction changes, therefore, you must offset
the focus position in Focus Surface by 300µm to a point below the surface when focusing in fluid.
Note: For example, if the surface is in focus with the Z motor positioned at -5000µm,
you must move the Z motor position down until it is at -5300µm.
When focusing on the sample surface directly in fluid, the following procedure is necessary:
a. Align laser (in air)
b. Locate tip (in fluid)
c. Focus surface (hit engage several times)
OR
d. Focus surface (beyond surface by another 300µm)
e. Realign laser
f. Realign laser in photodetector
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