How does a metal detector inform you that you have found something? Learn how a metal detector indicates that you have found coins, artifacts, or jewelry. The head, or the circular thing that you see being...
The head, or the circular thing that you see being waved over the ground, has two wire loops in it. The ascending loop sends a signal somewhat like a radar signal or a sonar signal down into the ground. If it strikes metal, it bounces back up and is caught by the receiving signal, this is the receiving loop. The receiving loop sends that electronic signal to computer chips in the control box. The computer chips analyze things like conductivity and mass. Then it decides whether to give a beep to tell you "here's the kind of object you like to find" or to keep quiet because you have told the machine not to respond to that type of metal. The computer chips can fairly actively decide what is in the ground and the more expensive machines can also tell you how deep it is in the ground. With that information, you decide whether to get out your little knife or screwdriver and open up a little hole in the ground and retrieve that object. Of course, one of the secrets of being able to come back to a park or a yard or wherever you're hunting is to put the soil back neatly, so the next day nobody could see you've been there.
