Physicist moots wireless electricity
2006 11 28

By Anna Salleh | abc.net.au



You may one day be able to recharge your laptop or mobile phone without having to plug it into the wall, says a US physicist.

But others say there are many hurdles before such transfer of energy means we can say goodbye to wires.

Assistant Professor Marin Soljacic, of Massachusetts Institute of Technology, will present his team's work at the American Institute of Physics forum in San Francisco this week.

Today's wireless transfer of energy, such as the transfer of light energy from the Sun for solar power or the transfer of microwaves from transmitters for communication, involve relatively low levels of energy.

But recharging devices like laptops requires a much higher level of energy. And if this was routinely zapped through the air it could 'fry' any living organisms that get in the way.

But Prof Soljacic says he has found a way of transmitting energy so that only the devices that it is recharging will pick it up, so it will not affect humans.

Instead of using traditional radiation, he wants to use the part of the electromagnetic field that is 'non-radiative'.

He says devices can be tuned to the frequency of this field and thus act as a sink for all the energy the transmitter gives out.

Prof Soljacic says this would prevent energy radiating out to areas it does not need to go to, providing an efficient and safe method of wireless energy transfer.

"The team calculates that an object the size of a laptop could be recharged within a few metres of the power source," he says. "Placing one source in each room could provide coverage throughout your home."

Prof Soljacic also thinks the technology could be used to power freely roaming robots in a factory.

Finding a 'magic' frequency
But Australian physicists, yet to see the full details of Prof Soljacic's work, are sceptical of his claims.

They say the challenge is finding a 'magic' frequency that does not also affect living organisms and thus pose possible health risks.

"You would be reintroducing all the problems that we went through with mobile phones," says Dr Geoff Anstis of the University of Technology, Sydney, referring to the uncertainty surrounding any long-term health effects of using mobiles.

"And it wouldn't be until a couple of decades that you may be happy that there isn't a significant problem."

His colleague Professor Geoff Smith agrees and says there are also technical challenges to keeping the devices tuned with the transmitters, thus preventing the general release of stray energy.

"I think this is nice physics but there's a way to go before it would be possible," says Prof Smith.

He says any changes in the surrounding environment could "de-tune" the system and stop the safe and efficient transfer of power.

Electrical engineer Dr Trevor Bird of CSIRO's ICT Centre says attempts so far to develop wireless power transfer have not been very successful.

He agrees that safety and technical barriers to wireless power systems are huge and would like further details on Prof Soljacic's proposal.

Dr Bird also says that, depending on the frequency of the field, the antenna on the device being recharged may have to be very large.

Article from: http://www.abc.net.au/news/newsitems/200611/s1789387.htm



Related Articles
Brave New World of Tesla Technology


Latest News from our Front Page

Group Polarization and the Fad of Ethno-masochism
2014 11 26
From "Group polarization: A critical review and meta-analysis". Journal of Personality and Social Psychology. 6 50 (6): 1141--1151 The psychology of White self hatred. Political correctness IS a mental disorder. More: Group polarization: A critical review and meta-analysis. Isenberg, Daniel J. the paper Indoctrinate U Harvard Professor Noel Ignatiev talks about how to end the White race The History of Political Correctness The Narrative: The origins of Political ...
Credo: A Nietzschean Testament by Jonathan Bowden
2014 11 26
This lecture by Jonathan Bowden was given at the 11th New Right meeting in London on September 8, 2007. The original title of the presentation was “The Art and Philosophy of Jonathan Bowden.” I think ideas are inborn, and you’re attracted, if you have any, toward certain systems of thinking and sensibility and response. From a very young age, I was ...
A Look Back at the OJ Simpson Verdict -- Reactions
2014 11 26
This is a look back at the different reactions to the OJ Simpson verdict some 20 years ago (exact date of verdict was Oct 3, 1995). The OJ Simpson jury consisted of 9 Blacks, 1 Hispanic, and 2 Whites. It would raise eyebrows after they only deliberated for 4 hours in a case that they were involved in for almost ...
New York Times Publishes Darren Wilson’s Street Address and Photo of House #Ferguson
2014 11 26
Hey here are the two @nytimes scumbags that published Wilson’s home address. —> @juliebosman & @campbellnyt— Ben Howe (@BenHowe) November 25, 2014 Michael Brown’s Stepdad Shouting ‘Burn This Bitch Down’ The New York Times published information about the address of Ferguson Police Officer Darren Wilson on Monday in a move that has generated controversy. Tensions are running high in Ferguson, Missouri, as ...
How Monsanto is Destroying the Brains and Health of Everyone
2014 11 25
Interested in slowing your aging process? Take note! One of my most recent blog entries summarized roughly 10 years of research related to the consequences of inflammatory processes in the periphery of the body, such as the gut, and how this was driving brain degenerative inflammatory processes within the brain. One of the key findings from that research was how pathogenic ...
More News »