GSSI StructureScan Mini XT Quick Start Manual page 26

StructureScan Mini XT Quick Start Guide
Refining the Image
The grid data are being processed with a technique called "migration." Migration will
remove the tails from the hyperbolas and collapse them back to the target's central point. It
is very useful as a tool for tightening up the 3D image. Migration requires you to have the
correct dielectric value of the concrete. The best way to do this is to take a test scan in the
ScanMax app and use one of the depth calibration methods to calculate the correct value.
Please see the ScanMax section for details.
If you do not know the dielectric, then you can modify it during while playing back data.
Toggle to the 2D linescan viewpoint. You will see an image like the one at the right. This
shows a single grid line with raw hyperbolas on the bottom and processed, focused targets
on the top.
The top data focus quality depends on the using the correct dielectric. The goal is to have
the top image show as a series of small dots at the locations of the hyperbolas. The image
at the right shows a correct value. If the top image contains hyperbolas, or upside-down
hyperbolas, use your finger to drag the left scale bar up and down until the shapes collapse
into tight dots.
When you are satisfied with the result, click Viewpoint to return to the grid view.
It will take a few moments to regenerate the grid image, so please be patient.
Page 22
Focused
Data
Raw Data