Cool new technology - NBC



http://www.guardian.co.uk/science/2009/jan/04/wireless-power-technology-witricity

The Observer, Sunday 4 January 2009


No more batteries, no more chargers and no more wire spaghetti. This
is the future promised by "wireless power", a means of broadcasting
electricity through the air to laptops, iPods and other gadgets
without the need for cables and sockets.

Untethered lighting, audio speakers and digital picture frames are
expected to be among the first commercial products demonstrated in Las
Vegas this week at the International Consumer Electronics Show, the
world's biggest gadgets tradeshow.

Experts believe this is just the beginning and that eventually
wireless electricity - dubbed "WiTricity" by some - could do for
battery life what WiFi did for the internet. In a world without wires,
laptop users in cafes and airport terminals would be inside an
"electricity hotspot" and no longer have to delve past legs, bags and
furniture in search of an awkwardly located socket.

"You'd be able to buy a desk that charged any gadget placed on it, or
power any PC you put on top," said James Holland, editor of gadgets
website Electricpig.co.uk.

"If each room had wireless power, you'd know that once you walked
through the front door your mobile would start charging up - even
while still in your bag or pocket. You'd never need to hunt for the
right charger again."

Among the companies showcasing the ambitious technology at CES is
PowerBeam. Its system turns electricity into an invisible laser, then
literally beams it, as heat, across the room to a solar cell that
converts it back into electricity.

David Graham, the co-founder of PowerBeam, told the Observer: "We're
going to delete the word 'recharge' from the English dictionary. If
your cellphone is recharging on your desk all day, you won't be
thinking about it."

The Silicon Valley company can currently use a laser to generate about
1.5 watts of power to a solar cell 10 metres away. This would be
enough to power an electronic speaker or small LED (light-emitting
diode) lights, but not enough to operate a laptop, which requires an
estimated 30 to 50 watts. However, Graham said that the technology
could comfortably be scaled up.

PowerBeam insists its laser does not pose a risk to users' health
because it is simply moving heat from one place to another. Graham
said that, if someone walked through the beam, it would shut down
within a thousandth of a second, then restart once the path was clear.

The technology also promises energy efficiency because it would only
power products when needed.

Concerns have been raised about a possible link between
electromagnetic waves and cancer, but scientists insist that the
energy would only be picked up by gadgets designed to "resonate" with
the field.
.