comp.arch.embedded,sci.electronics.components metal dector for barbed wire fences
Anybody here have any suggestions for possible ways to detect fence wire, mostly 1, 2 or 3 levels of barbed wire but also some 8 inch square matrix? Typical mounting would be on a tractor or trailer, so the detector would need a sense of direction, ie looking outward not inward. Minimum range would be around one foot with 4 feet probably optimum. Typical retail metal detectors have a short range and need a metal free environment, leaving the methods they use somewhat doubtful. Evidently, there are detectors with seperate heads/coils and 1-5 foot ranges but, once again, require a metal free environment. One possible area would utilize rf antenna's, one transmiting and the other recieving a reflection from the wire(s). A parabolic or corner reflector type antenna maybe if not for the high frequency - two 12 inch antenna's would be about max size and that's in the gigaherts range, which might be a problem. Any suggestions along this line will be appreciated.