SoylentNews is people
SoylentNews
from the for-your-safety,-please-remove-tinfoil-hat dept.
Disney researchers have created a system for wirelessly transmitting power:
Quasistatic Cavity Resonance for Ubiquitous Wireless Power Transfer (open, DOI: 10.1371/journal.pone.0169045) (DX)
Wireless power delivery has the potential to seamlessly power our electrical devices as easily as data is transmitted through the air. However, existing solutions are limited to near contact distances and do not provide the geometric freedom to enable automatic and un-aided charging. We introduce quasistatic cavity resonance (QSCR), which can enable purpose-built structures, such as cabinets, rooms, and warehouses, to generate quasistatic magnetic fields that safely deliver kilowatts of power to mobile receivers contained nearly anywhere within. A theoretical model of a quasistatic cavity resonator is derived, and field distributions along with power transfer efficiency are validated against measured results. An experimental demonstration shows that a 54 m3 QSCR room can deliver power to small coil receivers in nearly any position with 40% to 95% efficiency. Finally, a detailed safety analysis shows that up to 1900 watts can be transmitted to a coil receiver enabling safe and ubiquitous wireless power.
Also at Disney Research and NBF.
(Score: 3, Informative) by PiMuNu on Friday February 17 2017, @03:22PM
The authors propose making a resonant cavity, fill it with 1 MHz RF at 600 V/m, and then put a receiver coil in to generate electricity. High Q, low loss, can only be achieved if the cavity (i.e. room) walls are made from metal with a reasonably simple geometry - like a square.
(Score: 1) by Muad'Dave on Friday February 17 2017, @07:09PM
The FCC MPE calc here [hintlink.com] shows that at 1900W and 0dBi and 1 MHz, you're safe at about 2 feet from the radiator if you take into account ground reflections, and a little over 1.3 feet if you don't. That's a lot closer than I imagined, but then again we don't couple to 1 MHz very well.
(Score: 2) by Dr Spin on Friday February 17 2017, @08:58PM
OTOH, medium wave reception is clobbered for approximately 900 miles.
Much as I trust FCC calculations, I do not intend to try it until I have an embedded RF sensor inside my eyeballs
Oh, wait ...
Warning: Opening your mouth may invalidate your brain!
(Score: 2) by butthurt on Saturday February 18 2017, @05:13AM
While the chosen frequency is indeed in the medium-wave band. However, the chamber is constructed of aluminium panels, so that--except when the door is open-it would form a Faraday cage. With the door open, would the structure radiate efficiently at 1 MHz? An open doorway is small compared to the corresponding wavelength: less than 3 m as compared to 300 m. If it does radiate efficiently, that would be a useful discovery in itself, as the antennas used for medium-wave transmitters are generally much larger than this chamber.