Re: Simple signal transmission using long steel pipe

John Larkin wrote:

On 11 Apr 2006 01:29:04 -0700, "paulus9528@xxxxxxxxxxx"
<paulus9528@xxxxxxxxxxx> wrote:

I am a mechanical/hydraulics engineer with an application which may be
more suited to you guys' expertise. What I want to do is transmit a
signal from a remote (up to 5km) device through a long piece of steel
pipe. The remote device incorporates a sensor which produces a simple
signal (on/off) which I would like to detect remotely. Is this feasible
to transmit a sigal (electrical or sound) without any signal boosters
etc.? If this is in no way feasible I have other solutions but this
would make a real neat, simple and cheap solution. Your advice/help is
much appreciatd.

If the pipe can be grounded at both ends, a current transformer could
induce a signal at one end, and another could pick it up at the other
end. Leakage to earth along the way would cause losses, but I suspect
it's workable at several km.

Not hard to try: a couple of regular metering-type CTs, a signal
generator and an audio amp at the drive end, another amp and
headphones to receive.

John

What's in the pipe? What's it made of? What diameter? How are sections
attached?

I'm thinking of a waveguide, but the losses could be too high for
something not optimized for RF use.


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Paul Hovnanian mailto:Paul@xxxxxxxxxxxxx
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