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Treasure hunting metal detectors

  1. May 16, 2008 #1


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    How do they discriminate between good (targets ) and rubbish, it seems that the orientation of the (Target) can fool the detector, from using one of these detector for many years , i find that the depth of the (Target) is instrumental in the discrimination, and only after years of (detecting) can can one fine tune the signals received.
  2. jcsd
  3. May 17, 2008 #2
    Maybe this site can help(and look for other sites)


    "Metal detectors can distinguish metal objects from each other based on the ratio of their inductance to their resistivity. This ratio gives rise to a predictable delay in the receive signal at a given frequency. An electronic circuit called a phase demodulator can measure this delay"
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