Re: Simple signal transmission using long steel pipe

In article <1144744144.847057.130430@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
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.

Folks in the oil industry transmit information by modulating the pressure
of the drill mud. If your data rate is very low, you could do something
like that.

If you have a pipe in the soil, you can still send an electrical signal
down it. The soils resistance is enough higher than the pipes. You will
be dealing with a very small signal. The real problem is the other
contact of the transmitter and receiver. They need to be as far from the
pipe as practical. Your signalling frequency needs to be quite low. I'd
suggest the local mains frequency divided by 2 as a good first guess.




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