RE: Experiment - Displacement Current's Magnetic Fields

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Original poster: "Wall Richard Wayne by way of Terry Fritz <twftesla-at-qwest-dot-net>" <rwall-at-ix-dot-netcom-dot-com>

Terry,
 
A couple of suggestions regarding your experiment.  The Rogowski coil has to be
meticulously and symmetrically wound.  It must be calibrated with known AC and
DC currents.  You need to determine its inherent bandwidth.  To prevent
spurious outside current signals the wire entering and penetrating the Rogowski
coil on both sides has to be exactly perpendicular to the windings in the
coil.  Theoretically the wires traversing the Rogowski coil on both sides
should null out any opposing outside currents.  Before you place the capacitor
in the coil, test with a straight wire straight across the diameter of the
coil.  This will allow checking for any geometric anomaly in the experimental
set up.  You can null out any stray currents/magnetic fields ahead of time. 
Then check with capacitor in situ, but shorted in the center.  A very important
point is the capacitor, even though, a "flat plate" capacitor must have the!
leads attached on each side in the very center, not entering the opposite edges
of the plates.  Or else, it is just an asymmetric capacitor and capacitor
dielectric charges with an asymmetric E field.  And, you know what that could
do proving dD/dT.  8<}=)
 
These are only suggestions,
 
RWW
>
> Hi Antonio, Richard, Paul, All,
>  
> Going off Richard's original idea but correcting for obvious problems, I
> would like to propose an experiment to test for magnetic fields caused by
> displacement currents.  I wrote up my notes and posted than at:
>  
>
> <http://hot-streamer-dot-com/temp/DCtest1.jpg>http://hot-streamer-dot-com/temp/DCt
> est1.jpg
>  
> http://hot-streamer-dot-com/temp/DCtest2.jpg
>  
> Forgive the "sketches", keyboards and carpel tunnel...  Sister stole all
> the artistics in the family...
>  
> Basically, it is a 6 inch diameter disk capacitor made from double sided PC
> board material.  All the conductors lie in a plane.  A current sensing coil
> is placed around it that only detects B-fields caused by displacement
> currents and ignores those from the conducted currents (I could slit the
> disk's conductors).
>  
> If the displacement currents create a B-field, then the current if the
> Rogowski coil should be the same as measured by the external current
> transformer.  If there is no B-field, the current will be darn near zero...
> The results should be (hope hope) "perfectly clear".  The Rogowski coil
> should have little effect on the E-field of the capacitor since it can be
> space say an inch away.
>  
> A plain sight easily reproducible experiment that should be definitive.
> Rogowski coils may seem kind of weird but they are basic
>
(<http://www.rocoil.cwc-dot-net/page2a.htm>http://www.rocoil.cwc-dot-net/page2a.htm). 
> I thought this would be better
> than fancy Pear$on CTs for others to reproduce.  
>  
> I can't see any obvious problems but if there is some improvement or
> terrible flaw I would appreciate knowing??  ?:-))
>  
> Any bets as to the results :o))  Personally, I have no idea as to what it
> will be.  I would think it will either be Maxwell's great "I told you so"
> or them other guy's great "gotcha!" :-))
>  
> Cheers,
>  
> Terry
> <mailto:<x-ta> terrellf-at-qwest-dot-net">terrellf-at-qwest-dot-net
>  
>  
>  
>  

 
--- Richard Wayne Wall
--- <mailto:rwall-at-ix-dot-netcom-dot-com>rwall-at-ix-dot-netcom-dot-com