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Fluid Imaging
Operating Principles
162 Dimension 3100 Manual Rev. D
10.5.9 Lower Probe into Fluid
Lower the head, allowing the fluid tip holder to enter the liquid. The fluid should form a meniscus
around the fluid tip holder (see Figure 10.3a).
Note: The laser sum signal must be greater than 0.5V to use the Z motor. It may be
necessary to use the detector mirror adjustment screws to roughly center the
reflected laser beam on the detector before using either the Focus Surface or
Stepper Motor commands.
Note: To prevent air bubbles, you may first place a drop of fluid on the probe.
10.5.10 Readjust Laser Alignment
Lowering the tip holder into fluid causes the laser spot to move towards the fixed end of the
cantilever by roughly 25µm. To compensate for this shift, proceed with the following:
1. Turn the right-rear laser aiming screw slightly counter-clockwise to move the laser spot back
to the free end of the cantilever.
2. Check that a bright reflected laser spot is still present on the laser viewing window.
Occasionally, air bubbles will become trapped near the cantilever and these may interfere with the
laser beam's optical path. If this occurs, it may be impossible to get a good reflection from the
cantilever after putting the tip holder into fluid. In this case, do the following:
3. Remove the SPM head from the dovetail.
4. Lightly rinse the tip holder with liquid.
5. Replace the SPM head.
10.5.11 Adjust Photodetector
Adjust Detector Offsets
Turn the detector mirror adjustment screws to center the laser spot on the laser detector as
described in Chapter 7.
Set several parameters:
•For Contact Mode: Vertical Deflection signal = roughly -1V, and Setpoint = 0V.
(These are typical starting parameters).
•For TappingMode: Vertical Deflection signal = 0V.
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