Quote:
Originally Posted by Qiaozhi
And ... I wouldn't waste any time with L-rods or MFDs.
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Exactly. And thanks for your reply.
The question perhaps doesnt have to do with metal detectors . so let me try to make an example
I have a neodymium magnet that can induce very clearly a field at any conductor hanging from a thread across the room.-the conductor moves that is- My room is about 25ft. So seemingly the first step is established into simulating a distance object. The next step is receiving the information which could be the tricky part. I may have a mental block but it looks like there can be only two solving approaches for the next step:
A-The new of course much weaker magnetic field induced in the distant conductor may be too weak for me to still detect it at the 25ft distance ? perhaps a super sensitive magnetometer could help but I understand that the field would be very low.
B-(the better solution?) Detecting by receiving the electromagnetic wave with an antenna. I.e, after we have excited our little conductor from a distance with our strong magnetic pulse train of a specific frequency from the tx, current is induced in the distant conductor at the same frequency and now we receive the weak electromagnetic wave of the same frequency emanating from the conductor. I am really not sure if my point is clear but I would love why this cant work ?
thanks