3 ms·
Summary:- Far-field electromagnetic waves are reflected/absorbed by the body therefore are not useful for energy transfer. Near-field waves do not reach far en
by programmer_dude 12y ago
Summary:-
Far-field electromagnetic waves are reflected/absorbed by the body therefore are not useful for energy transfer. Near-field waves do not reach far enough to be useful (1/r^3 law). The discovery: Mid-field waves, waves which propagate well in biological tissue.
- msandford 12y agoThe near field 1/r^3 is defined by r and the starting point for how you define r is the radius of the coil used to generate the magnetic field. The average human body isn't much more than a foot thick. Putting a 12" diameter and thus 6" radius coil in a bit of padding and wearing it like a backpack isn't out of the question especially if it's only for a few hours to charge up every day. Or built in to your bed. That's not to say that what's been discovered here isn't a lot better than a big-ass coil. Just that the idea you couldn't get wireless power into the body is wrong. People have been using subdermal inductive charging for insulin pumps for years.
- deleted 12y ago[deleted]
- programmer_dude 12y ago>Just that the idea you couldn't get wireless power into the body is wrong. Agreed! But like you said this might make this thing a little less unwieldy.
- msandford 12y agoYeah I guess I was disagreeing with the notion in the article that the researcher "invented" a way to get wireless power into the body. That's already done. It works. It's not great, but it works. So what was cooked up was a huge improvement, not the original invention.