fair weather current
philmt59 at aol.com
Sun Jun 17 16:08:18 CDT 2012
Like I said, the electronics part is trivial. However, excellent insulators are key. A wire grid of about 6 - 8 inches square makes a good detector, but you need to mount it firmly with really good insulators. Wood won't cut it, and some plastics may not be suitable either. A trailing wire to the electronics with leaky insulation (even with tens of megohms resistance) touching ground will mess up the results. A passing spider casually exploiting the grid as a web support will do likewise. Dew? Rain? Condensation? A blade of grass? No results.
Don't let me put you off - it's easy to measure this astonishing concept of a 100 V/m field, but getting high quality, reproducible results demands no little ingenuity. You have to think in terms of gigaohms and higher. Go for it.
On 17 Jun 2012, at 21:35, Mark Whittington wrote:
> Now I want to do this.
> On Sun, Jun 17, 2012 at 9:11 AM, Phil <philmt59 at aol.com> wrote:
> An interesting subject; makes a great science-fair / school project. It's not difficult to use a MOSFET or MOSFET op-amp to track 1V/cm electric fields, using a small wire grid mounted 1 cm above the ground. You will see some interesting inversions and voltage hikes as storms approach.
> Phil M1GWZ
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