The Search Area will autosize to triple the Reference Area. The easiest way to set the Reference Area
and Search Area for me is to first set the Reference Area using the provided control, and then adjust the
Search Area with the mouse by grabbing onto one of the corner handles that appear. Then I move the
two areas together over my area of interest.
If you activate Automatic Drift Correction during imaging it will use the last acquired image as the
reference or it will wait for the current image to finish acquiring if there was no image already acquired
behind it.
Another option is the Auto Update reference image control. This will refresh the Reference Image with
the best match after each acquired image. Otherwise, leaving that option disabled will continue to
compare to the original reference image.
The software will also generate a log file describing the drift behavior while drift correction is running. If
you are doing the Correct During Images mode and it has a good stable drift there should be little to no
offset between each images as the continuous correction should remove that need.
Automatic and Manual Drift Corrections have been added with this release. Both Automatic and Manual
drift correction modes can be set to Correct Between Images or Correct During Images. The Correct
Between Images mode will update the scan offsets between image scans. Correct During Images will
update the scan offsets and calculate a “Drift Vector” from those offsets so that it can continuously update
the scan offsets during the image acquisition to maintain a constant location on the sample.
4.5.1 Automatic Drift Correction
The user can specify a “Reference Area” on the image that will be remembered by the software and
compared to the “Search Area” in subsequent acquired images. If the Reference Image has moved
inside the Search Area the image scan offsets will be adjusted so that the Reference Image will be in its
original spot relative to the image frame.
The Reference Image will not change after a new image is taken unless Update drift image is selected.
In that case, the software will use the closest match that was found inside the Search Area as the new
Reference Image for the next image scan. This can be useful if the sample has some evolution over time
during the image acquisition.
4.5.2 Manual Drift Correction
Manual drift correction works very similar to Automatic drift correction. The main difference is that the
user will specify the drift vector and scan offsets rather than have the software calculate these values.
This mode can be useful when a known drift is occurring in the system or if the user wants to induce a
drift into the experiment.
4.6 Image+Spectroscopy Mode
The R9 software has the ability to take topographic data and pause to take spectroscopic data in a set of
selected points, along a line, or in a grid of points inside a region, within the image area. The points,
line or region can be selected from the Spectroscopy tab of the Scan Area Window. The Location or
Spacing menu option will only be enabled when Line or Region is selected as the Image+Spectroscopy
Spec Location type.
The Spec Locations must also be set to User Defined Points for the software to acquire Image+Spec
data in this mode.
4.6.1 Points
The software can be configured to take spectroscopic data at arbitrary locations during image acquisition.
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