15 F1A4 Operator Instructor Notes and Syllabus
Minelab Countermine Division
Safety through Excellence
Thirty seven
Pinpointing Targets - Edge Detection – Pinpointing Small Targets
Key points:
•
Explain to the students that when a possible target has been located continue to
sweep the Coil over the location, but reduce the size of the sweeps to more
accurately determine the position of the target.
•
To further pinpoint the location, sweep the Coil across the ground and advance
forward towards the target with a half Coil diameter overlap on each sweep.
Notice when the target signal is first heard – this determines the edge of the
target area.
•
Advance another sweep distance and approach the Coil from each side. Notice
when the target signal is first heard – this will indicate the side boundaries of the
target area.
Thirty eight
Pinpointing Targets - Edge Detection – Large or Multiple Targets Step 1
Note
Use the PowerPoint Presentation to explain the technique of edge detection and
mapping against multiple and large targets. Note that this will be demonstrated
in the outdoor area but should first be explained in the classroom.
When large or multiple targets are found it may be difficult to define the target by using
the crossing method as discussed in the previous slide. It is therefore recommended
that the following procedure be used to define large or multiple targets:
•
Start high and pass the Coil over the target at ever decreasing heights until you
get an indication of the main centre (or centres) of the metallic mass.
Thirty nine
Pinpointing Targets - Edge Detection – Large or Multiple Targets
Step 2
•
At normal search height, move the Coil from outside the detection zone directly
towards the centre of the mass, and note where a clear detection signal is heard.
Forty
Pinpointing Targets - Edge Detection – Large or Multiple Targets
Step 3
•
Repeat the process in Step 2 at small intervals around the whole target to
provide an outline of the shape of the target.
Forty one
Pinpointing Targets - Edge Detection – Large or Multiple Targets
Step 4
•
Listen for indications of tone pitch. This may indicate multiple targets or booby
traps.
