Here are the YouTube videos:
EDIT: Obvious in retrospect, but alternating current like this is exactly how you make EM/radio waves, so my comment above is misleading.
However, that's the cool part about this research. They are generating quasistatic magnetic fields, and decoupling the magnetic field from the electric field—similar to how near-field charging pads work, but at room scale. So they are producing very little in the way of EM radiation. From the paper:
> For example, radiative transfer methods have tightly coupled electric and magnetic fields that propagate over long distances and are typically used for radio communication. These far-field wireless power techniques have not found wide spread use, since they are limited to delivering only a few milliwatts of power due to health and safety concerns. In contrast, non-radiative transfer systems such as inductive charging cradles and resonant charging pads can safely deliver 10s-100s of watts of power by loosely decoupling the magnetic fields–which are used to transfer power–from the potentially harmful electric fields. However, near-field coupling is a highly localized phenomenon and transfer efficiency drops off rapidly as the source and receiver are separated by more than a coil diameter. Likewise, it is not possible to strongly couple coils of drastically different sizes.
> Drawing upon recent work using far-field standing electromagnetic waves to generate uniform field patterns in a metallic chamber, we introduce quasistatic cavity resonance (QSCR); which can be used to create near-field standing waves that fill the interior of the resonant structure with uniform magnetic fields, allowing for strong coupling to small receivers contained within.
I don't think you can have one without the other, can you?
A varying electrical field produces a magnetic field.
Therefore if you produce either a varying electrical field or a varying magnetic field, you will generate the other, which will then propagate out; this is EM radiation.
I only did a quick read of the paper, but this looks like they are generating a standing wave (think like a guitar string, where the amplitude of motion is fixed at any point along the string) with a wavelength much larger than the size of the room; this lets them capture the electrical field in capacitors in the center of the room while still having a moving magnetic field throughout the room, thus effectively separating the two, which allows for a moving magnetic field (which the receivers can convert to an electric field) without having a high-magnitude electrical field in the free space of the room.
There are capacitive elements in the pole which is important for allowing it to be resonant at a wavelength much larger than the room (the wavelength used is over 200 meters).
The very long wavelength means that, in theory, one cuold design a room with less of the perimeter conductive (a wire mesh would certainly work; they suggest that doors and windows, or even conductive panels that are connected could work).
This article apparently says that they have made a practical way to transfer magnetic energy to inductors (coils) well beyond the near field range. They do this by creating quasistatic magnetic fields within a specific space. The coils within that space react to the magnetic fields the way coils in a circuit would.
Like the other commentor though, I'm not very strong with my physics knowledge, so I can't answer for certain, but I'll be reading about it at the gym tonight I think.
Though it would heat any water or fat lying around.
very far infrared == very short microwave
On the other hand, the outer ~0.03 mm is dead. So ???
Think theme park and sound stage, not home and office.
- pacemaker warning sign on the edge of the doorframe
- Frequency smack in the middle of the AM band (1.32 MHz)
- demo'ing very low power consumers
- very directionally sensitive (just like any other radio transmitter)
- room is set up like a Faraday cage
Unless I'm mistaken, that should give you 3 orthogonal coils.
That does give you 3 orthogonal coils, technically, but the other 2 orthogonal planes will get very little power.
> Finally, the high Q-factor and sub-wavelength operation of the QSCR room permits the inclusion of windows and doors, without significantly altering system performance.
But there may be limits on how much area can be covered by windows...
There are already demos of this:
...but drones use so much power that it's unsustainable beyond demos. Beaming power to them suddenly makes this useful because you can keep them flying indefinitely.
I'll predict that if Disney actually have this working beyond a prototype, we'll see demos of drone swarms building complex objects out of children's bricks within a year, and prototypes of tool-wielding drones actually doing assembly within another.
+ A small sphere drone with a dusting cloth around it to vacuum things.
+ Never charge a remote control anymore.
+ Knowing if someone is present by sensors in the floor, furniture, etc.
+ Automated valves on the heaters.
+ Charging locks (not requiring wires should be better w.r.t. security).
+ Easier light placements. They can be put in any cabinet (where it is normally dark, but you don't want to put wires).
+ Blinds, curtains control
+ Speakers integrated in couches / chairs. Perfectly located. Vibrations etc. is also cool as experience.
+ Clothing. So called smart "shoes", "belts", "umbrellas", etc. only hinges on wireless charging taking off.
So this could totally be used for a HMD already. I wonder if it interferes at all with data transmission protocols that are used for wireless on the currently available HMDs...
I wish them well.
I don't mean literally in the wall like behind sheetrock, I mean if you scored a line in the sheetrock and placed the thick 12 gauge wire in there or whatever.
Even at 95%, I wouldn't want a 1900W cool near my body for fear of burns. (Compare 100W light bulb)
Finally, what do other electronics do within this field? It's not like there aren't already lots of coils (inductors) that would now have to worry about significant RF back power!
But I suppose you'll say we are magnetic beings or something?