9 F1A4 Operator Instructor Notes and Syllabus
Minelab Countermine Division
Safety through Excellence
SLIDE
DESCRIPTION
Twenty one
LESSON 3 – PRINCIPLE OF OPERATION
Aim
. To understand the principle of metal detection and how Multi-Period Sensing
(MPS) eliminates false alarms generated from mineralized ground.
Classroom instruction. The instructor must decide whether the content of this lesson is
applicable for the student group. The training aids required are:
Chalk board or white board.
F1A4 detectors - one per pair of students (minimum).
One set (four “D” cells) of fresh batteries.
Two different types of mineralized rock (laterite if available).
F1A4 Training PowerPoint Presentation.
The major teaching points of this lesson are as follows:
Revision.
Principle of Operation.
Multi Period Sensing.
Demonstration of Ground Balancing.
TEACHING POINTS
Revision
. Nominate selected students to assemble and disassemble the F1A4 in front
of the class.
Twenty two
Twenty three
Principle of Operation.
Using the slides, explain the principle of metal detection. Emphasize:
•
All detectors use the same magnetic principle to detect metal.
•
The smaller the target the more difficult to obtain a response.
•
Where the ground is mineralized, the false alarm can hide a minimum metal
mine.
•
Conventional detectors must reduce sensitivity to combat the effects of ground.
•
Reducing the sensitivity of a detector increases the risk of not detecting a
minimum metal mine.
•
The F1A4 has no sensitivity adjustment as it can maintain maximum sensitivity
even when working in heavily mineralized soil.
