Sensors & Software pulseEKKO Product Manual page 132

The most common application of Transillumination are Borehole GPR surveys, but it can
also be used above the surface on objects like dams, thick walls and pillars.
Transillumination surveys are less common than reflection type surveys because the
data requires a fair amount of processing to get meaningful results.
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Transillumination – ZOP – Short for Zero Offset Profile. The transmitter and receiver
are moved in sync, or equal steps.
Another example is, if you are scanning a column (Figure 6-14), as you move the
transmitter 10cm up the column, the receiver also moves the corresponding distance in
the same direction.
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Transillumination – MOG – Short for Multi-Offset Gather. The goal for this survey is to
generate multiple ray paths with as many different angles as possible. This is done by
fixing the transmitter, then moving the receiver at regular intervals. Then the transmitter
Figure 6-14: Transillumination survey on a column
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System Configuration