Re: measuring EM field

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jimlux-at-earthlink-dot-net>

Perhaps not with interferometry (as you note the very long wavelength...)

However, given that long wavelength, you can probably make a static 
approximation of the field (except for the "interesting stuff" like spark 
growth).

You can measure the field at a bunch of points, and then solve Poisson's 
equation for the volume with the boundary condition of your measurements.


At 08:41 AM 12/19/2002 -0700, you wrote:
>Original poster: "Laurence Davis by way of Terry Fritz 
><twftesla-at-qwest-dot-net>" <meknar-at-hotmail-dot-com>
>
>Would it be possible to map the EM field from a tesla system
>using interferrometry? (sp) Essentially a transmitter / receiver
>with a narrow focused RF signal of known frequency and amplitude
>aimed through the field you are inspecting. Compare values to determine
>field intensity.  I had a lab where microwaves were focused, so I assume
>with a little math that a collimated microwave 'beam' would be possible.
>however, I would expect that trying to use microwaves to map 200khz 
>transmissions would be difficult to see any interferrence. Since the 
>energy levels are a magnitude different. And trying to
>focus 200khz or near that would be difficult, quarter wavelength being 
>1000ft or so. I would expect that attempting to focus that energy, the
>lens would need to be at least 1/4 wavelength.
>
>I wonder if I could con the physics lab guy to let me test this.
>hmmm...
>
>any of this sound remotely feasible?
>larry.
>