Re: Useless questions

["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>

> > a) The amplitude of the return would give info about the size
> > and/or density of the ionisation - we could see how quickly it
> > forms, and try to observe its persistence between cycles/bangs.
> > b) Observe the surface of the 'ionisation sphere' move towards/away
> > from the radar by looking for doppler-induced sidebands - the line
> > width of the return would tell us how fast it was moving, and the
> > homodyne is perfect for that, isn't it?  You'd tap into it right at
> > the detector for max BW.
> >
> > As for interference, I don't know.  I'd guess that at 10Ghz you'd be
> > up above most of the hash.  You'd need to take firm action to
> > prevent the coil RF from getting into the radar DC supply, etc, eg
> > battery powered, faraday cage, with small window for the radar to
> > see out through?
> > --
> > Paul Nicholson
> > --
>
> I'm sure that a) is indeed true.  As for b) I can't see any way that
> the relatively low frequency doppler component of an echo from something
> as turbulent as streamers could be separated from the background noise.
> That's where a wide-band pulsed system could probably be used, if one
> were available.
>
> Ed

Would there be some statistics of the doppler that might be of use?  The
trick is going to be in measuring dopplers in the few Hertz range, but on a
time scale of less than a microsecond... quite the detection challenge...