Oxford Instruments Cypher SPM, Руководство пользователя

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Cypher SPM
User Guide
Observe spot on lever:
l
Motors inside Cypher will now move to bring the laser spot where you clicked.
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The spot position does not need to be perfect here, only roughly centered on the cantilever to
produce a decent reflected beam (measured by the Sum signal in the Sum and Deflection Panel).
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If needed, the spot position will be fine tuned in a later step.
13.
Locate sample surface optically:
l
Under the Approach tab on the Engage Panel use the downward arrow keys to motor the micro-
scope objective down toward the sample, until it comes in focus (See Image in the next step). Use
the up arrows if you overshoot.
l
Single arrows are slow, double arrows fast.
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Once in focus, hit the Set button next to the Focus on Sample button. Note that the sample
height value updates.
14.
Observe sample surface optically:
l
Features may be hard to see at zoom = 1 and auto decimation turned on. For instance, in the
image to the right decimation = 1 and zoom = 2. See
10. for more information.
Fun
Now that you have stored tip and sample position, you can repeatedly click on the buttons Focus
on Sample and Focus on Tip and go back and forth between tip and sample.
15.
Question
I cannot seem to focus on the surface of my rough sample.
Answer
The objective can only motor down a few millimeters before it meets up with the cantilever. If
you did not manually move the cantilever close enough you will never get a focused image (such
as the one on the right) of the sample. In this case hit the “Focus on Tip” button in the engage
panel and repeat
22. .
Question
I cannot seem to focus on the surface of my smooth sample.
Answer
Perfectly reflecting samples may not offer enough features to allow the focus to be determined.
In this case move the Field Diaphragm lever (marked with an F) on the view system until you see a
dark circle on the screen. As you motor down this circle will become sharper. When the ring is in
focus, as in the image to the right, so is the sample.
24 Engaging the cantilever on the sample Page 163 of 243