In reply to Paul's message of Wed, 11 Oct 2006 22:24:45 -0700 (PDT): Hi Paul, [snip] >Furthermore, most of the radiation would internally >reflect off the cores outer walls.
If the core is solid metal, then I doubt the radiation would ever make it to the outer walls. It would all be absorbed by the free electrons in the metal. However this may not be a bad thing. A normal radio antenna is also made of metal, and when it intercepts radio waves it just results in an oscillating current in the metal, particularly if the antenna is tuned to the frequency of the waves. So you could do the same thing. Just determine what the frequency is, and attach a tank circuit to the core that matches the frequency of the core. You have direct conversion into RF energy in the tank circuit (with a bit of luck). What you end up with is a tuned antenna, with an internal power source. Then all you have to do is rectify the output of the tank circuit, and store it in a capacitor. If the voltage isn't high enough for rectification, then just couple a transformer to the tank circuit and boost it first. >Note that in >microwave ovens the metal reflects the radiation-- >only a small amount is absorbed. This process of >slowing down the radiation and reflecting is >understood when studying electrodynamics in detail. >Also you can see this effect in electrodynamic >computer simulations. The end result would be most of >the radiation reflecting internally, which would cause >heat. Actually, that's what I was referring to in my previous email, but then I realized that that isn't what happens in an antenna, therefore, perhaps not if the core forms part of a tuned circuit. >Here's a list of methods to decrease the >magnetic materials ability to absorb the radiation in >addition to increasing the potential radiation. It might be easier to just let it "absorb" the radiation (see above). [snip] >3. High saturation materials. A fully saturated core >prevents the intrinsic electron spins from absorbing >the magnetocaloric energy. You don't really need to worry about this, because the energy isn't lost, even when it is absorbed by bound electrons. It is just delays the output "temporarily". The trick is to include rectification in the external circuit, so that there is a net flow of power out of the core. (Once it has been converted into DC there is no way it can reenter the core). [snip] Regards, Robin van Spaandonk http://users.bigpond.net.au/rvanspaa/ Competition provides the motivation, Cooperation provides the means.
