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How to make a metal detector? Answered

Pheewww.....SCIENCE project!!

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sf49ers (author)2014-01-21

I made my metal detector by getting a small, handheld radio and a calculator. First you turn on the radio to AM and find a station with just static and then you turn on the calculator and tape it to the back of the radio. When it detects metal the static should get louder.

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Toby Robb (author)2013-04-21

Metal detection relies on detecting the increase in the induction of a coil when it gets iron as its core. You basically have to build an induction meter.

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steveastrouk (author)Toby Robb2013-04-21

How does that work with gold then ?

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Toby Robb (author)steveastrouk2013-04-21

Iron is the only thing that conducts magnetic fields really well, so its the one that effects inductance in a coil the most. I think the other ways to detect other metals are sending a pulse with one coil and detecting the pulse with another. Nearby metals cause a delay in the pulse i believe.

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steveastrouk (author)Toby Robb2013-04-22

Precisely. So inductance is not the only method of detecting metals..

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rickharris (author)2013-04-21

Have a look at the related column on the right

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