Ch. 4. Tutorial: AC Mode in Air, Std. Scanner Sec. 4.4. Imaging
4.4.2. Start Imaging and Parameter Tuning
1.
• Click the ‘Do Scan’ button on the ‘Main’
tab of the ‘Master Panel’, and imaging
will begin after a moment. Scan
initiation first moves the tip to the
starting point of the image, then lowers
the tip onto the surface, and then begins
an endless series of image scans. The
red cursor to the left of each image
window indicates the scan line/ location
of the tip.
Tip
To enhance contrast on the image display, click and drag a box around the
area of interest. Then right click and select fix scale.
2.
Determining Image Quality:
• Start the learning process on a sample with a known topography, like the Asylum
Research Calibration Grating being used in this tutorial.
• Look at the ’Scope Trace’ below the image. This graph represents the most recent line
of the image. Blue indicates the tip moving left to right (a.k.a trace) and Red indicates
tip returning from right to left (a.k.a retrace ).
On most samples with relatively slowly changing features, trace and retrace should look the
same. In other words, the landscape should look the same if you are flying the exact same
route one way or the reverse. The image above shows the two as being quite different; this
is an indication that imaging parameters need to be adjusted.
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