Biomedical Engineering Reference
In-Depth Information
Typically, a software interface is used for controlling the AFM stage. Functions con-
trolled by software include setting all movement of the
X-Y
stagetolocatethefeaturefor
scanning, probe approach to get the probe near/on the surface, selection of scan mode,
setting and controlling scan parameters, display of images while scanning, and a
capability for measuring force-distance (F/D) curves. Sometimes image processing
and analysis are also handled within the same application, but these functions are
covered in Chapter 5. Figure 2.25 is a screenshot of a typical AFM scan control window.
The following section describes the functions found in the control software.
2.4.1 Display
Visualizing the AFM data in real time is critical to the efficient operation of the AFM. This
allows an operator to ensure that they are scanning the correct region of a sample, and
facilitates optimizing the scan parameters such as scan rate and PID settings. Typically
there are at least two types of display.
Fig. 2.25. A window such is this is typically used for acquiring AFM images. There are sections for
A: displaying images; B: displaying 2-D profiles, C: entering scan parameters; and D: entering
feedback parameters.
