GSSI StructureScan Mini XT Quick Start Manual page 33

StructureScan Mini XT Quick Start Guide Page 29
Cinder Block/CMU
Filled cell
The Mini XT is an effective tool for
non-destructively checking for proper
CMU construction. The data at the
right was collected by running the Mini
XT horizontally along a course of
CMUs. The Mark button was pushed
each time the center of the Mini XT
(side laser) crossed the joint between
Empty cells
two adjacent blocks. The marks show
up on the right as the vertical red dotted
lines. Between each pair of marks is
one block.
Rebar
Each CMU has two open cells. Those
show as the large black areas near the
top of the image. Blocks with two
empty cells have a pair or black areas
between the marks. Filled cells do not
have a black area since the fill material
is close in dielectric to the block itself,
and thus no reflection is produced. Each of the filled cells has a rebar as reinforcement. Those show as the hyperbolas in
the filled cells.