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RE: Topics Moderator note

Original poster: Jim Lux <jimlux@xxxxxxxxxxxxx>

At 01:19 PM 7/20/2005, you wrote: 
Original poster: "Denicolai, Marco" <Marco.Denicolai@xxxxxxxxxxx>

Jim,
I agree with you. We should follow the evolution of the secondary voltage and current, and also of the streamer current in order to gain more knowledge about the streamer elongation process.
It only seems like nobody gives a f*** about it, at least judging from the high number of replies to my recent post dated 7/15/2005 (subject "Streamer V/I evolution").

It IS summer vacation time, after all. And, we're all consumed by weighty philosophical arguments <grin>...


I know that the measurement is trivial but I'm still going to elaborate on it and to check if there is anything interesting in there (freq. shift of the secondary, bang energy balance, etc.). During the second half of August I'm also going to use a better scope with a deeper memory, so that the sample rate will be improved. For what is worth... :)

Best Regards

I think an interesting thing to do might be to take some recorded E field measurements, chop them up into separate bangs, and then do a fit on each one to get a "resonant frequency vs bang", which you could then calculate back to estimate Csec (assuming Lsec is constant).

As I think about it, what might also be needed is the primary current or voltage recorded simultaneously, because you really have two coupled LCs, and the fres of both affects the recorded waveform.

I would assume, as a first cut, that the coupling between primary and secondary is constant, and that Cpri and Lpri are also the same.

Of course, there's another complexity in that inevitably, there's more than one streamer at a time, BUT, I wonder if you did a series of measurements, there would be some interesting statistics in there (say doing correlations at various bang number lags).




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From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: Wed 7/20/2005 6:03 PM
To: tesla@xxxxxxxxxx
Subject: Re: Topics Moderator note

Original poster: Jim Lux <mailto:jimlux@xxxxxxxxxxxxx>jimlux@xxxxxxxxxxxxx
<SNIP>

>To take the recent earth resonance issue, it has got me started
>thinking about how one might be able to better model the change in
>capacitance by looking at recorded E field waveforms (specifically,
>comparing the waveform in successive bangs, as the channel presumably grows).