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dvandom posted: 02 Oct at 4:44 pm
Yes, to a point. Metal detectors send out a magnetic pulse, which induces a current in nearby metal and results in a magnetic pulse generated by the metal. How strong and how “pure” the return pulse is can tell the detector how much metal there is, as well as something about what it’s made of. For instance, gold is a better conductor than aluminum, so it’ll generate a stronger pulse for the same size object (other sensors can give some idea how big the thing is physically).
Handheld units probably can’t pick apart an object into types. If you had a copper/zinc modern penny, it would probably have that info programmed in and be able to tell you. But if there were a roll of pennies of different types all clumped together, wouldn’t be able to tell you how many were pure copper and how many were zinc with copper coating.
Note that coin-operated devices use a similar effect to tell if you’ve put a real coin or a slug into the machine. One of the challenges in designing the current dollar coin was that it had to have the same magnetic properties as the Susan B. Anthony dollars, since a lot of vending machines had been designed to take those.