In a simplified manner, all metal detectors work on the principle of electromagnetics and
the effect on conductive metals. A metal detector uses battery power to create a
penetrating magnetic field that enters the ground. Anything metallic will then become
charged with the magnetism, similar to a paper clip becoming magnetized after touching a
standard magnet. The magnetized metal below ground then sends a signal back to the
metal detector alerting the user (usually by sound) to the fact that there is something
metallic below ground, what kind of metal it found (high-end units), and how deep the
metal is (high-end units). NOTE: Most metal detectors can detect up to 12 inches below
the surface. Many will work much deeper..
| The Basics of Metal Detectors |
components.
1) Stabilizer–this is usually an arm brace that keeps the unit steady as it is
swept back and forth over the ground.
2) Control Box—this is the “brains” of the metal detector and contain the
circuitry, controls, speaker, batteries, and microprocessor. It may also contain
a jack for headphones,
3) Shaft—this connects the control box to the search coil. It is often
adjustable so it can be set at a level for your height.
4) Search Coil—this is the part that actually senses the metal below ground.