On 10/6/12 4:39 PM, Dave Leddon wrote:
Interesting article. This could be a boon to Tesla Coilers everywhere if we can just figure out how to locate the rebar and connect a wire to it. Making the connection shouldn't be difficult once you have a hole drilled down to the rebar. You could use a lead concrete anchor and a long lag bolt. The problem would be knowing where to drill. Dave
Capacitive coupling to the slab is probably just fine at 100kHz. You're not trying to conduct fault current from a power line and need a <25 ohm impedance.
Let's assume you have a square meter of aluminum sheet that sits a couple mm from the slab..
The capacitance is C = epsilon0 * area/spacing = 8.84E-12 * 1/0.002 = 4.42E-9 Farad.. 4.42nF
Now, what's the impedance at 100 kHz (typical TC frequency).. about 360 ohms..
Make it 4 square meters and you're down to 90 ohms..But, even better, that 2x2 meter aluminum sheet provides a very much lower resistance return for the fields from the top load than the soil ever will.
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