Ch. 17. Optics Sec. 17.3. View system
(a) Zero (b) 2 (c) 1.5
Figure 17.1.: Some examples of correction collar settings.
17.3. View system
The view system protrudes from the top of the AFM enclosure. It contains a software controlled white
light source and camera. It also has three user controls. Two levers for adjusting image brightness and
contrast, and a focus ring.
The focus ring is typically set at its detent position, in which case the optical view in the camera is
focused in the same plane as the laser spot used to detect cantilever motion, which usually brings the
back of the cantilever into focus. In most cases a focused view of the sample, and not the back of the
cantilever is desirable. During imaging, use the focus ring on the view system to bring the sample into
focus.
During the engage process, the ring should be returned to the neutral (detented) position. A sensor will
inform the software if this is not the case and you will be warned before engaging to adjust the view
system focus if necessary.
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