Outlets Are Out
Imagine recharging your cell phone without plugging it in. Or powering your iPod while you walk around the house with it. Researchers at the Massachusetts Institute of Technology (MIT) have taken the first steps towards such wireless energy transfer by conceptualizing a way to transmit electricity over room-size distances. One day, they say, the technology could power whole households or even motor vehicles wirelessly.The MIT team calls the concept a nonradiative electromagnetic field. It involves two simple ring-shaped devices made of copper. One, connected to a conventional power source, would generate magnetic fields similar to those that power electric motors. These fields would stretch outward a few meters and would only affect the receiving–or companion device–which would be outfitted with a second copper ring tuned to a specific frequency. Team leader Marin Soljačić says he began working on the concept because he wanted to find a better alternative to having to recharge his laptop computer and cell phone so frequently. He presented the team’s findings today at an American Institute of Physics forum in San Francisco, California.
The technology shouldn’t harm other electronics or humans, says team member John Joannopoulos. Computer simulations, he says, have shown that the essential mechanism–magnetic resonance–means little or no power is transferred to extraneous objects, such as computer hard drives or even magnetic stripes on credit cards. Joannopoulos says that „for certain designs, the effect on a person is weaker than the Earth’s own magnetic field.“
Although the concept has yet to be verified–the team is preparing prototypes that will be tested sometime next year–Joannopoulos says he is confident the tests will be successful. „Our computational experiments have been as close to reality as they can be,“ he says. In principle, he adds, „you could power everything in the room,“ and looking much farther into the future, he predicts that someday this technology could power motor vehicles down highways, using transmitters buried in the pavement.
It’s an „extremely original“ and „extremely exciting“ idea, says physicist Mordechai Segev of the Technion-Israel Institute of Technology in Haifa. If the concept is found to be reasonably efficient, he says, it „could revolutionize technology by making many battery-powered products lighter and smaller.“
foxie
allerdings, geili idee
rakudave
… wenns denn wirglig funzt
und was es dr rästlige umwält aatuet… well so wälle chönne au gförlich sii…
mol gugge…
Freidenker
no meh strahlig? mir werde scho gnueh versücht. überleget euch mol was für strahligsquelle mir all scho usgsetzt sind. täglich und fasch überall: radio, funkuhr, mobiltelefon, WLAN, Satellite… etc…. frogt sich was das für uswirkige het? sött mol e studie dezue geh. i bi ganz klar pro kabel!
rakudave
ebbe, befürchti au.
langzyt-studie giz ebbe nonig, wells das züüg erst sit churzem git…
Wi!!iam Wa!!ace
also das isch jo s’problem bi de meischte wanzene, d’batterie goht irgendwenn emol us. und eso wäri das letschte problem au glöst! und das find ich absolut net guet! well eso cha mr mensche ohni problem verwanze ohni dass jemols widr e uffladig brucht.
@ freidenker dr mensch wird scho so stark mit strahlig belaschtet, so dass es uf die strahlig glaub au nümm druf achunnt. also ich weiss dass e natel glaub die stärkschti strahlig hervor riefe duet und zwar mit satte 2Watt wobi en standart AP knapp 100mW!!
jonu halt ,wird d’menschheit verstrahlt!
foxie
usserdäm ischs doch magnetisch, wenn i mi nid tüsch, und das het imfall praktisch übrhaupt gar kei iifluss uff uns mensche.
Freidenker
alwäh, magnetismus het serwohl uswirkige! entsprechend gits au richtlinie wieviel tesla gwissi strahlequellene dörfe ha. es goht do nid nur um lüt wo en herzschrittmacher hend. ab gwisse feldstärkene sin sie tödlich. s militär macht dahingehend ja scho lang forschig. ah jo, und vergiss die erhöhti chrebswahrschinlichkeit nid….
foxie
jo, es stoht abr au gschriibe, dass d belaschtig bim meischte unter däre vom ärdmagnetismus liiegt…
Wi!!iam Wa!!ace
Und unseri Närvebahne dien nüt anders als elektrischi signal wyterleite, wo mr natürlich mit magnetfälder bzw em E-Fäld beiflusse/störe ka…. ha emol ufpasst im Elektrotechnik 😉
rakudave
krass was?