wickey@convex.UUCP (10/30/86)
I was talking to someone here at work about his metal detector the other day
and was told he could tune it to look for specific metals. Could someone
explain the mechanism used by metal detectors? Does it sense metals passively
or does the detector first broadcast on a certain frequency(ies) and listen
for a 'reply'? There are other questions which come to mind (why only metals,
similarities with nuclear magnetic resonance imaging, etc), but perhaps the
answers are obvious once the mechanics of the device are known, so I'll wait
to ask them (if they still need asking).
Thanks.
Faron Wickey {allegra, ihnp4, uiucdcs, ctvax}!convex!wickey