Re: [EE] low frequency Antenna
Bob Blick
> I am designing some metal detection circuit. I am using an FPGA. My coding
> has done and the hardware is working perfectly.
> But i need an antenna of 1kHz to 3MHz, i think i can make it using loop
> antenna, but i dont know the parameters.
I seem to recall you were detecting vehicles. This vehicle sensor has an
antenna that is definitely not a loop, it is inside what looks like 1/2
or 3/4 PVC pipe:
http://www.dakotaalert.com/catb2b1/product_info.php?cPath=35&products_id=111
In the product brochure it says it detects fast moving objects from
further distance ("keep 80 feet away from roads with fast-moving
traffic"). So it sounds like they are probably auto-zeroing the circuit,
which makes sense. I wonder what happens when a UFO flies close
overhead. Maybe I should mount one on my roof as a UFO detector? Here's
a link to the product brief:
http://www.dakotaalert.com/manuals/HWVS.pdf
Anyway, I imagine the probe is a coil, but definitely not a loop.
Cheers,
Bob
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