Technology: how a metal detector works
The tutor gives a nontechnical explanation of how a metal detector functions.
Watching Curse of Oak Island on the History channel, you see them use metal detectors.
How does a metal detector work? A basic explanation is this:
- The search coil has electricity passing through it so that it emits a magnetic field.
- A characteristic of metals (as opposed to nonmetals) is that their electrons are moved by a magnetic field.
- As the metal object’s electrons move, they change the electromagnetic environment. It’s a kind of “rebound” effect.
- The detector has a detection coil that senses the electromagnetic rebound broadcast from the movement of the metal’s electrons.
Source:Oracle Tutoring by Jack and Diane, Campbell River, BC.