Xiaofan Chen <xiaofanc <at> gmail.com> writes:

> How do you like the idea of Wireless Power Transfer?
> I think it is really an achievement.
> 
> http://web.mit.edu/newsoffice/2007/wireless-0607.html

I like the *idea* very much. However, the implementation, not to mention the
writeup is, err ..., let's see:

1. "The investigated design consists of two copper coils, each a self-resonant 
system. One of the coils, attached to the power source, is the sending unit. 
Instead of irradiating the environment with electromagnetic waves, it fills the 
space around it with a non-radiative magnetic field oscillating at MHz 
frequencies. The non-radiative field mediates the power exchange with the other 
coil (the receiving unit), which is specially designed to resonate with the 
field. The resonant nature of the process ensures the strong interaction 
between the sending unit and the receiving unit, while the interaction with 
the rest of the environment is weak."

2. (elsewhere) ... light a 60 W lightbulb at a distance ... copper coils 
... MHz range

Right, so we have a 'non-radiative' RF field of 'MHz range' that lights a 60W 
lightbulb at some distance. We also know that 'non radiative' RF fields of 'MHz
range' are used for diathermy in physiotherapy and other branches of the medical
profession. So the 'small interaction' with 'biological tissue' is 'important 
for safety'.

So basically it's an oversized electric toothbrush charger that doubles as
diathermy unit and local broadcast jammer (as well as a firestarter if the 
right size of coiled wire is anywhere in the building within range and can be
heated sufficiently by the injected energy), with a MIT brand for a good 
start ?

Sorry for being sarcastic but I have my limits.

Peter P.


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