Re: transferring electrical energy through metal wall

Child Taker wrote:

> Thank you for your reply. There is some electrical device inside of
> the pressure vessel, which has to be powered up. The device moves, so
> wires do not work (well enough). It has to be a contactless method of
> transmission of energy through metal wall. The pressure is, say,
> several tens or hundreds atmospheres. The prototype vessel has no
> pressure in it yet, as I am just trying out to develop the energy
> transmission system. I even allowed a hole in the wall, just to see if
> this makes the transmission of magnetic field any easier through it
> (the hole could be covered by a non-magnetic metal later, in
> principle). The first (unpressurised) prototype is made of aluminium,
> but ultimately it has to be made of steel to withstand the pressure.
> It has not been decided yet what kind of steel will be used; here I
> heard the suggestions that stainless steel is non-magnetic (and can be
> low-conductive), and therefore will provide less absorption of
> magnetic field (how much less ??). I have the knowledge of physics,
> but I am not a specialist in electromagnetism; I do not know
> practically such details as -- e.g. what is the difference between
> ordinary steel and soft iron; what are the principles determining the
> shape and the position of the "soft iron" poles ? I inserted ferrite
> core into the solenoid only because I heard that ferrites amplify the
> magnetic field by an order of three. But maybe ferrite core has no
> place in the system...

Revisit acoustic.  You'll generate eddy currents with
magnetic induction which will cause heating problems for
your equipment even if the vessel can deal with it.  With
accoustic, your tranmitter can be fixed while the internal
device moves.  The most important part is that the internal
device must have good contact with the vessel wall during
transmission.  If it needs to swim around, just send it
back to the walls every now and then to dump data.

Patience, persistence, truth,
Dr. mike


-- 
Mike Rosing
www.beastrider.com                   BeastRider, LLC
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