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A Step Closer to Self-powered Kit

Posted December 04, 2008 9:36 AM

From BBC News | Science & Environment | UK Edition:

Engineers have doubled the efficiency of piezoelectric devices that harvest energy from movement and vibration. The trick lies purely in the size of the devices: a narrow range of thicknesses around 5,000 times thinner than a human hair. The result means that "self-powered" devices, such as phones that charge when you speak into them, are one step closer to reality. The research was reported in the journal Physical Review B. The piezoelectric effect occurs in some crystalline and ceramic materials. Stretching or compressing them causes a separation of electric charge across their width, and that sets up a voltage that can be put to use. Such piezoelectric materials have been in use for years in devices such as electronic lighters and microphones, where pressure from a thumb or even a sound wave is harvested. More recently, plans to engineer piezoelectrics that collect energy from footsteps or the motion of clothing have made it to the drawing board. Several clubs even incorporate piezoelectrics into their dance floors, recycling a small part of the energy imparted by clubgoers.

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Guru
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#1

Re: A Step Closer to Self-powered Kit

12/04/2008 10:39 AM

"phones that charge when you speak into them"

If there was such a device on my daughter's phone, it would be able to power a small town.

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#3
In reply to #1

Re: A Step Closer to Self-powered Kit

12/05/2008 1:20 AM

Then we should supply such devices to all the politicians and political activists on Earth. The electricity generated from all the noise they produce will make the over-unity crackpots' dreams come true.

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#2

Re: A Step Closer to Self-powered Kit

12/04/2008 12:53 PM

Now, you see, this is where it all begins to go all "slippery slope".

As soon as machines understand that they're relying directly on the physical motions of their creators for energy, they're going to start doing all they can to encourage us to move around more.

At first they'll just pretend to malfunction so we'll give them a vigorous frustrated shake. Then devices like cellphones will feign poor reception so that we'll scurry around the room searching for signal, endlessly repeating "can you hear me?"

From there it's only a short leap to forced death marches and marathon disco dancing contests. Whichever is worse.

Mark my words.

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#4

Re: A Step Closer to Self-powered Kit

12/05/2008 4:50 AM

Couple this to the article aabove this one on the home page about Apple liquid cooling a laptop...

Now if they harvested the energy from the key presses...

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#6
In reply to #4

Re: A Step Closer to Self-powered Kit

12/05/2008 7:58 AM

Del, I HAD to offer this, when your post reminded me of it. Here's my take on the "energy recovery from key presses" idea -

My wife hates computing (she doesn't like computers much, either, but she REALLY hates having to actually USE one!), so during the DOS days, when you had to at least speak a smattering of the appropriate language, I used to get a phone call every day that went like this -

Mike, I can't (BANG! BANG!) (something either being pounded upon, or used to pound upon, the computer and its surrounding furniture) get this STUPID machine to (BANG! BANG!) work! Why .. does .. it .. ALWAYS .. do .. this .. to .. me..? (more banging). When I finally quit laughing, about the time I realized all those ellipsises above represented more dental bills to repair the tooth-grinding, I could usually talk her through a couple of keystrokes to fix it. I was, after all, a UNIX sysadmin, after learning DOS, so I had an extensive vocabulary in at least 4 computer languages already.

And think of the energy SHE could have recovered from all that banging, AND all that grinding. Come to think of it, I could have harvested all that laugh energy also (like Monsters, Inc., maybe?), but if I'd ever let her catch me laughing, we'd have needed that energy to cremate my remains.

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#7
In reply to #6

Re: A Step Closer to Self-powered Kit

12/05/2008 8:17 AM

...
And if we could only harvest the energy spent swearing at Morosoft.
Del

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#8
In reply to #7

Re: A Step Closer to Self-powered Kit

12/05/2008 9:26 AM

Moron-soft, did you say? I usually call them either Micro-Sloth or Micro-Snot (depends on who I am with. My wife IS a lady, after all.)

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#5

Re: A Step Closer to Self-powered Kit

12/05/2008 6:00 AM

That development could be interesting if used in hearing aids, where the received audio wave charges a tiny battery so that the amplifier can then make the sound discernible.

A large and continuing cost for the hard of hearing, is batteries for their hearing aids.

Kind Regards....

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#9
In reply to #5

Re: A Step Closer to Self-powered Kit

12/06/2008 1:17 AM

Harvest the background noise in the dicrimination circut to up the power of the cleaned signal.

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