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Re: witricity legality?
Quote:
Originally Posted by Alan Anderson
Look it up. It's more of a standing wave than a "traveling" one. Here's a reasonably comprehensive explanation:
http://www.andrew.cmu.edu/user/dcpri...nt%20waves.htm
The resonant coil in the 10 MHz system confines the waves in the same way as does total internal reflection in an optical system. |
I'll dig into this some more, and I may wind up eating more crow than I care to (I thought the term evanescent was being used in a layman's sense).
Most of the descriptions I read for this power transfer method smell very strongly of BS. I suspect that this is because well-meaning authors are mangling the real physics involved.
For example, in one I see an assertion that a coil fills the space around it with a non-radiative magnetic field. Something has to be wrong with that statement. It is almost certainly is an ill-formed sentence that is either wrong or lacking essential context.
This paper, http://www.sciencemag.org/cgi/rapidp...ref&siteid=sci , written by Marin Soljačić, does not appear to suffer from those oversimplified statements (nor does it refer to evanescent waves, non-radiating magnetic fields, etc.).
Blake
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