The Future of Flashlights - No Batteries Required?

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Wireless Energy Transfer also known as the "Tesla Effect" is a form of wireless power transfer. I am wondering if we will one day carry flashlights that receive their energy from an external source?

Maybe not in our lifetimes but maybe our grandchildrens?

I can foresee a whole line of "Powerbeamed" flashlights working off an energy grid similar to our cell phone grid. What do you think? Too expensive a technology at this point to become feasible?

There are various teams that have made some great steps in wireless energy technology. Professor John Boys team at University of Auckland has done a lot of research and breakthroughs in this area. In 2008, Thahn Tran at Brunel University designed a high efficiency wireless 3W LED and in the same year Intel borrowed John Boys design to power a light bulb at 75% capacity.

Thoughts?
 
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No. High amounts of EMF radiation is bad for you. Enough to power a flashlight at any distance would probably kill you.

In the late 19th century, the realization that electricity could be coaxed to light up a bulb prompted a mad dash to determine the best way to distribute it. At the head of the pack was inventor Nikola Tesla, who had a grand scheme to beam elec­tricity around the world. Having difficulty imagining a vast infrastructure of wires extending into every city, building, and room, Tesla figured that wireless was the way to go. He drew up plans for a tower, about 57 meters tall, that he claimed would transmit power to points kilometers away, and even started to build one on Long Island. Though his team did some tests, funding ran out before the tower was completed. The promise of airborne power faded rapidly as the industrial world proved willing to wire up.

Then, a few years ago, Marin Soljačić, an assistant professor of physics at MIT, was dragged out of bed by the insistent beeping of a cell phone. "This one didn't want to stop until you plugged it in for charging," says Soljačić. In his exhausted state, he wished the phone would just begin charging itself as soon as it was brought into the house.

So Soljačić started searching for ways to transmit power wirelessly. Instead of pursuing a long-distance scheme like Tesla's, he decided to look for midrange power transmission methods that could charge--or even power--portabl­e devices such as cell phones, PDAs, and laptops. He considered using radio waves, which effectively send information through the air, but found that most of their energy would be lost in space. More-targeted methods like lasers require a clear line of sight--and could have harmful effects on anything in their way. So Soljačić sought a method that was both efficient--able to directly power receivers without dissipating energy to the surrounding­s--and safe.

He eventually landed on the phenome­non of resonant coupling, in which two objects tuned to the same frequency exchange energy strongly but interact only weakly with other objects. A classic example is a set of wine glasses, each filled to a different level so that it vibrates at a different sound frequency. If a singer hits a pitch that matches the frequency of one glass, the glass might absorb so much acoustic energy that it will shatter; the other glasses remain unaffected.

Soljačić found magnetic resonance a promising means of electricity transfer because magnetic fields travel freely through air yet have little effect on the environment or, at the appropriate frequencies, on living beings. Working with MIT physics professors John Joannopoulos and Peter Fisher and three students, he devised a simple setup that wirelessly powered a 60-watt light bulb.

The researchers built two resonant copper coils and hung them from the ceiling, about two meters apart. When they plugged one coil into the wall, alternating current flowed through it, creating a magnetic field. The second coil, tuned to the same frequency and hooked to a light bulb, reso­nated with the magnetic field, generating an electric current that lit up the bulb--even with a thin wall between the coils.

Continued at link here:

http://www.technologyreview.com/read_article.aspx?ch=specialsections&sc=emerging08&id=20248

I don't think this technology would be good for powering flashlights in the field, but for recharging? Sure. I've already seen the wireless charging stations in catalogs and what not but never looked into the technology behind them.
 
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