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Search Technique
Using the correct search technique is crucial for optimum detecting.
Search Speed
The detector should be swept with a smooth even motion at a speed between 0.5 to 1 metre/sec (1.5' to 3'/
sec). If the detector is swept too fast or too slow small or deep targets may be missed.
Search Overlap
It is standard operating procedure to use a half coil overlap when sweeping, to ensure full ground coverage.
Search Height
To minimise false alarms, ensure that the Sensor
Head is swept as parallel to the ground as possible,
at a height of approximately 25–50mm (1–2").
Sweeping the Sensor Head closer than 25–50mm
(1–2") is recommended when only the MD Sensor
is operating.
The GPR Sensor should optimally be operated
no closer than 25mm (1") above the ground to
avoid ground coupling. Ground coupling is the
interaction between the GPR transmitter and the
receiver, which results in clutter and noise in the
GPR Imagery.
46 | Operating Procedures
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